Map symbols to allow multiple RCU flavors to be used in one binary
authorPaul E. McKenney <paulmck@linux.vnet.ibm.com>
Fri, 3 Jun 2011 16:43:17 +0000 (12:43 -0400)
committerMathieu Desnoyers <mathieu.desnoyers@efficios.com>
Fri, 3 Jun 2011 16:43:17 +0000 (12:43 -0400)
Probably need similar mapping for rcu_defer().  Definitely need
backwards-compatibility mapping for programs compiled against
old versions of the library.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
15 files changed:
Makefile.am
tests/Makefile.am
tests/rcutorture.h
tests/urcutorture.c
urcu-bp-map.h [new file with mode: 0644]
urcu-bp.c
urcu-bp.h
urcu-call-rcu-impl.h [new file with mode: 0644]
urcu-call-rcu.c [deleted file]
urcu-map.h [new file with mode: 0644]
urcu-qsbr-map.h [new file with mode: 0644]
urcu-qsbr.c
urcu-qsbr.h
urcu.c
urcu.h

index 776fa2b..4b70644 100644 (file)
@@ -30,7 +30,7 @@ COMPAT+=compat_futex.c
 endif
 
 lib_LTLIBRARIES = liburcu.la liburcu-qsbr.la liburcu-mb.la liburcu-signal.la \
-                 liburcu-bp.la liburcu-defer.la liburcu-call.la \
+                 liburcu-bp.la liburcu-defer.la \
                  libwfqueue.la libwfstack.la librculfqueue.la librculfstack.la
 
 liburcu_la_SOURCES = urcu.c urcu-pointer.c $(COMPAT)
@@ -45,7 +45,6 @@ liburcu_signal_la_CFLAGS = -DRCU_SIGNAL
 
 liburcu_bp_la_SOURCES = urcu-bp.c urcu-pointer.c $(COMPAT)
 
-liburcu_call_la_SOURCES = urcu-call-rcu.c $(COMPAT)
 liburcu_defer_la_SOURCES = urcu-defer.c $(COMPAT)
 
 libwfqueue_la_SOURCES = wfqueue.c $(COMPAT)
index 3c025a4..8dacb11 100644 (file)
@@ -28,21 +28,20 @@ if COMPAT_FUTEX
 COMPAT+=$(top_srcdir)/compat_futex.c
 endif
 
-URCU=$(top_srcdir)/urcu.c $(top_srcdir)/urcu-pointer.c $(top_srcdir)/urcu-call-rcu.c $(top_srcdir)/wfqueue.c $(COMPAT)
-URCU_QSBR=$(top_srcdir)/urcu-qsbr.c $(top_srcdir)/urcu-pointer.c $(top_srcdir)/urcu-call-rcu.c $(top_srcdir)/wfqueue.c $(COMPAT)
+URCU=$(top_srcdir)/urcu.c $(top_srcdir)/urcu-pointer.c $(top_srcdir)/wfqueue.c $(COMPAT)
+URCU_QSBR=$(top_srcdir)/urcu-qsbr.c $(top_srcdir)/urcu-pointer.c $(top_srcdir)/wfqueue.c $(COMPAT)
 # URCU_MB uses urcu.c but -DRCU_MB must be defined
-URCU_MB=$(top_srcdir)/urcu.c $(top_srcdir)/urcu-pointer.c $(top_srcdir)/urcu-call-rcu.c $(top_srcdir)/wfqueue.c $(COMPAT)
+URCU_MB=$(top_srcdir)/urcu.c $(top_srcdir)/urcu-pointer.c $(top_srcdir)/wfqueue.c $(COMPAT)
 # URCU_SIGNAL uses urcu.c but -DRCU_SIGNAL must be defined
-URCU_SIGNAL=$(top_srcdir)/urcu.c $(top_srcdir)/urcu-pointer.c $(top_srcdir)/urcu-call-rcu.c $(top_srcdir)/wfqueue.c $(COMPAT)
-URCU_BP=$(top_srcdir)/urcu-bp.c $(top_srcdir)/urcu-pointer.c $(top_srcdir)/urcu-call-rcu.c $(top_srcdir)/wfqueue.c $(COMPAT)
-URCU_DEFER=$(top_srcdir)/urcu.c $(top_srcdir)/urcu-defer.c $(top_srcdir)/urcu-pointer.c $(top_srcdir)/urcu-call-rcu.c $(top_srcdir)/wfqueue.c $(COMPAT)
+URCU_SIGNAL=$(top_srcdir)/urcu.c $(top_srcdir)/urcu-pointer.c $(top_srcdir)/wfqueue.c $(COMPAT)
+URCU_BP=$(top_srcdir)/urcu-bp.c $(top_srcdir)/urcu-pointer.c $(top_srcdir)/wfqueue.c $(COMPAT)
+URCU_DEFER=$(top_srcdir)/urcu.c $(top_srcdir)/urcu-defer.c $(top_srcdir)/urcu-pointer.c $(top_srcdir)/wfqueue.c $(COMPAT)
 
 URCU_LIB=$(top_builddir)/liburcu.la
 URCU_QSBR_LIB=$(top_builddir)/liburcu-qsbr.la
 URCU_MB_LIB=$(top_builddir)/liburcu-mb.la
 URCU_SIGNAL_LIB=$(top_builddir)/liburcu-signal.la
 URCU_BP_LIB=$(top_builddir)/liburcu-bp.la
-URCU_CALL_LIB=$(top_builddir)/liburcu-call.la
 WFQUEUE_LIB=$(top_builddir)/libwfqueue.la
 WFSTACK_LIB=$(top_builddir)/libwfstack.la
 RCULFQUEUE_LIB=$(top_builddir)/librculfqueue.la
@@ -95,24 +94,24 @@ test_perthreadlock_SOURCES = test_perthreadlock.c $(URCU_SIGNAL)
 
 
 rcutorture_urcu_SOURCES = urcutorture.c
-rcutorture_urcu_CFLAGS = -DTORTURE_URCU $(AM_CFLAGS)
-rcutorture_urcu_LDADD = $(URCU) $(URCU_CALL_LIB) $(WFQUEUE_LIB)
+rcutorture_urcu_CFLAGS = -DRCU_MEMBARRIER $(AM_CFLAGS)
+rcutorture_urcu_LDADD = $(URCU) $(WFQUEUE_LIB)
 
 rcutorture_urcu_mb_SOURCES = urcutorture.c
-rcutorture_urcu_mb_CFLAGS = -DTORTURE_URCU_MB $(AM_CFLAGS)
-rcutorture_urcu_mb_LDADD = $(URCU_MB_LIB) $(URCU_CALL_LIB) $(WFQUEUE_LIB)
+rcutorture_urcu_mb_CFLAGS = -DRCU_MB $(AM_CFLAGS)
+rcutorture_urcu_mb_LDADD = $(URCU_MB_LIB) $(WFQUEUE_LIB)
 
 rcutorture_qsbr_SOURCES = urcutorture.c
-rcutorture_qsbr_CFLAGS = -DTORTURE_QSBR $(AM_CFLAGS)
-rcutorture_qsbr_LDADD = $(URCU_QSBR_LIB) $(URCU_CALL_LIB) $(WFQUEUE_LIB)
+rcutorture_qsbr_CFLAGS = -DRCU_QSBR $(AM_CFLAGS)
+rcutorture_qsbr_LDADD = $(URCU_QSBR_LIB) $(WFQUEUE_LIB)
 
 rcutorture_urcu_signal_SOURCES = urcutorture.c
-rcutorture_urcu_signal_CFLAGS = -DTORTURE_URCU_SIGNAL $(AM_CFLAGS)
-rcutorture_urcu_signal_LDADD = $(URCU_SIGNAL_LIB) $(URCU_CALL_LIB) $(WFQUEUE_LIB)
+rcutorture_urcu_signal_CFLAGS = -DRCU_SIGNAL $(AM_CFLAGS)
+rcutorture_urcu_signal_LDADD = $(URCU_SIGNAL_LIB) $(WFQUEUE_LIB)
 
 rcutorture_urcu_bp_SOURCES = urcutorture.c
-rcutorture_urcu_bp_CFLAGS = -DTORTURE_URCU_BP $(AM_CFLAGS)
-rcutorture_urcu_bp_LDADD = $(URCU_BP_LIB) $(URCU_CALL_LIB) $(WFQUEUE_LIB)
+rcutorture_urcu_bp_CFLAGS = -DRCU_BP $(AM_CFLAGS)
+rcutorture_urcu_bp_LDADD = $(URCU_BP_LIB) $(WFQUEUE_LIB)
 
 test_mutex_SOURCES = test_mutex.c $(URCU)
 
index 66fdd7f..aba74b0 100644 (file)
@@ -66,7 +66,6 @@
  */
 
 #include <stdlib.h>
-#include "../urcu-call-rcu.h"
 
 DEFINE_PER_THREAD(long long, n_reads_pt);
 DEFINE_PER_THREAD(long long, n_updates_pt);
index 63fa386..a098d87 100644 (file)
@@ -8,22 +8,19 @@
 #include "api.h"
 #define _LGPL_SOURCE
 
-#ifdef TORTURE_RCU_MEMBARRIER
-#define RCU_MEMBARRIER
+#ifdef RCU_MEMBARRIER
 #include <urcu.h>
 #endif
-#ifdef TORTURE_URCU_SIGNAL
-#define RCU_SIGNAL
+#ifdef RCU_SIGNAL
 #include <urcu.h>
 #endif
-#ifdef TORTURE_URCU_MB
-#define RCU_MB
+#ifdef RCU_MB
 #include <urcu.h>
 #endif
-#ifdef TORTURE_QSBR
+#ifdef RCU_QSBR
 #include <urcu-qsbr.h>
 #endif
-#ifdef TORTURE_URCU_BP
+#ifdef RCU_BP
 #include <urcu-bp.h>
 #endif
 
diff --git a/urcu-bp-map.h b/urcu-bp-map.h
new file mode 100644 (file)
index 0000000..6321802
--- /dev/null
@@ -0,0 +1,61 @@
+#ifndef _URCU_BP_MAP_H
+#define _URCU_BP_MAP_H
+
+/*
+ * urcu-map.h
+ *
+ * Userspace RCU header -- name mapping to allow multiple flavors to be
+ * used in the same executable.
+ *
+ * Copyright (c) 2009 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+ * Copyright (c) 2009 Paul E. McKenney, IBM Corporation.
+ *
+ * LGPL-compatible code should include this header with :
+ *
+ * #define _LGPL_SOURCE
+ * #include <urcu.h>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ *
+ * IBM's contributions to this file may be relicensed under LGPLv2 or later.
+ */
+
+/* Mapping macros to allow multiple flavors in a single binary. */
+
+#define rcu_read_lock                  rcu_read_lock_bp
+#define _rcu_read_lock                 _rcu_read_lock_bp
+#define rcu_read_unlock                        rcu_read_unlock_bp
+#define _rcu_read_unlock               _rcu_read_unlock_bp
+#define rcu_register_thread            rcu_register_thread_bp
+#define rcu_unregister_thread          rcu_unregister_thread_bp
+#define rcu_init                       rcu_init_bp
+#define rcu_exit                       rcu_exit_bp
+#define synchronize_rcu                        synchronize_rcu_bp
+#define rcu_reader                     rcu_reader_bp
+#define rcu_gp_ctr                     rcu_gp_ctr_bp
+
+#define get_cpu_call_rcu_data          get_cpu_call_rcu_data_bp
+#define get_call_rcu_thread            get_call_rcu_thread_bp
+#define create_call_rcu_data           create_call_rcu_data_bp
+#define set_cpu_call_rcu_data          set_cpu_call_rcu_data_bp
+#define get_default_call_rcu_data      get_default_call_rcu_data_bp
+#define get_call_rcu_data              get_call_rcu_data_bp
+#define get_thread_call_rcu_data       get_thread_call_rcu_data_bp
+#define set_thread_call_rcu_data       set_thread_call_rcu_data_bp
+#define create_all_cpu_call_rcu_data   create_all_cpu_call_rcu_data_bp
+#define free_all_cpu_call_rcu_data     free_all_cpu_call_rcu_data_bp
+#define call_rcu                       call_rcu_bp
+
+#endif /* _URCU_BP_MAP_H */
index 04bb675..5474f9f 100644 (file)
--- a/urcu-bp.c
+++ b/urcu-bp.c
@@ -35,6 +35,8 @@
 #include <unistd.h>
 #include <sys/mman.h>
 
+#include "urcu-bp-map.h"
+
 #include "urcu-bp-static.h"
 /* Do not #define _LGPL_SOURCE to ensure we can emit the wrapper symbols */
 #include "urcu-bp.h"
@@ -375,3 +377,5 @@ void rcu_bp_after_fork_child(void)
        ret = pthread_sigmask(SIG_SETMASK, &oldmask, NULL);
        assert(!ret);
 }
+
+#include "urcu-call-rcu-impl.h"
index d92fbd1..fdf885c 100644 (file)
--- a/urcu-bp.h
+++ b/urcu-bp.h
@@ -46,6 +46,8 @@
 extern "C" {
 #endif
 
+#include "urcu-bp-map.h"
+
 /*
  * Important !
  *
@@ -69,8 +71,8 @@ extern "C" {
  *
  * Mark the beginning and end of a read-side critical section.
  */
-#define rcu_read_lock()                _rcu_read_lock()
-#define rcu_read_unlock()      _rcu_read_unlock()
+#define rcu_read_lock_bp()             _rcu_read_lock()
+#define rcu_read_unlock_bp()           _rcu_read_unlock()
 
 #else /* !_LGPL_SOURCE */
 
@@ -115,4 +117,6 @@ static inline void rcu_init(void)
 }
 #endif
 
+#include "urcu-call-rcu.h"
+
 #endif /* _URCU_BP_H */
diff --git a/urcu-call-rcu-impl.h b/urcu-call-rcu-impl.h
new file mode 100644 (file)
index 0000000..9fa6aa6
--- /dev/null
@@ -0,0 +1,615 @@
+/*
+ * urcu-call-rcu.c
+ *
+ * Userspace RCU library - batch memory reclamation with kernel API
+ *
+ * Copyright (c) 2010 Paul E. McKenney <paulmck@linux.vnet.ibm.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <stdio.h>
+#include <pthread.h>
+#include <signal.h>
+#include <assert.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+#include <poll.h>
+#include <sys/time.h>
+#include <syscall.h>
+#include <unistd.h>
+
+#include "config.h"
+#include "urcu/wfqueue.h"
+#include "urcu-call-rcu.h"
+#include "urcu-pointer.h"
+#include "urcu/list.h"
+
+/* Data structure that identifies a call_rcu thread. */
+
+struct call_rcu_data {
+       struct cds_wfq_queue cbs;
+       unsigned long flags;
+       pthread_mutex_t mtx;
+       pthread_cond_t cond;
+       unsigned long qlen;
+       pthread_t tid;
+       struct cds_list_head list;
+} __attribute__((aligned(CAA_CACHE_LINE_SIZE)));
+
+/*
+ * List of all call_rcu_data structures to keep valgrind happy.
+ * Protected by call_rcu_mutex.
+ */
+
+CDS_LIST_HEAD(call_rcu_data_list);
+
+/* Link a thread using call_rcu() to its call_rcu thread. */
+
+static __thread struct call_rcu_data *thread_call_rcu_data;
+
+/* Guard call_rcu thread creation. */
+
+static pthread_mutex_t call_rcu_mutex = PTHREAD_MUTEX_INITIALIZER;
+
+/* If a given thread does not have its own call_rcu thread, this is default. */
+
+static struct call_rcu_data *default_call_rcu_data;
+
+/*
+ * If the sched_getcpu() and sysconf(_SC_NPROCESSORS_CONF) calls are
+ * available, then we can have call_rcu threads assigned to individual
+ * CPUs rather than only to specific threads.
+ */
+
+#if defined(HAVE_SCHED_GETCPU) && defined(HAVE_SYSCONF)
+
+/*
+ * Pointer to array of pointers to per-CPU call_rcu_data structures
+ * and # CPUs.
+ */
+
+static struct call_rcu_data **per_cpu_call_rcu_data;
+static long maxcpus;
+
+/* Allocate the array if it has not already been allocated. */
+
+static void alloc_cpu_call_rcu_data(void)
+{
+       struct call_rcu_data **p;
+       static int warned = 0;
+
+       if (maxcpus != 0)
+               return;
+       maxcpus = sysconf(_SC_NPROCESSORS_CONF);
+       if (maxcpus <= 0) {
+               return;
+       }
+       p = malloc(maxcpus * sizeof(*per_cpu_call_rcu_data));
+       if (p != NULL) {
+               memset(p, '\0', maxcpus * sizeof(*per_cpu_call_rcu_data));
+               per_cpu_call_rcu_data = p;
+       } else {
+               if (!warned) {
+                       fprintf(stderr, "[error] liburcu: unable to allocate per-CPU pointer array\n");
+               }
+               warned = 1;
+       }
+}
+
+#else /* #if defined(HAVE_SCHED_GETCPU) && defined(HAVE_SYSCONF) */
+
+static const struct call_rcu_data **per_cpu_call_rcu_data = NULL;
+static const long maxcpus = -1;
+
+static void alloc_cpu_call_rcu_data(void)
+{
+}
+
+static int sched_getcpu(void)
+{
+       return -1;
+}
+
+#endif /* #else #if defined(HAVE_SCHED_GETCPU) && defined(HAVE_SYSCONF) */
+
+/* Acquire the specified pthread mutex. */
+
+static void call_rcu_lock(pthread_mutex_t *pmp)
+{
+       if (pthread_mutex_lock(pmp) != 0) {
+               perror("pthread_mutex_lock");
+               exit(-1);
+       }
+}
+
+/* Release the specified pthread mutex. */
+
+static void call_rcu_unlock(pthread_mutex_t *pmp)
+{
+       if (pthread_mutex_unlock(pmp) != 0) {
+               perror("pthread_mutex_unlock");
+               exit(-1);
+       }
+}
+
+/* This is the code run by each call_rcu thread. */
+
+static void *call_rcu_thread(void *arg)
+{
+       unsigned long cbcount;
+       struct cds_wfq_node *cbs;
+       struct cds_wfq_node **cbs_tail;
+       struct call_rcu_data *crdp = (struct call_rcu_data *)arg;
+       struct rcu_head *rhp;
+
+       thread_call_rcu_data = crdp;
+       for (;;) {
+               if (&crdp->cbs.head != _CMM_LOAD_SHARED(crdp->cbs.tail)) {
+                       while ((cbs = _CMM_LOAD_SHARED(crdp->cbs.head)) == NULL)
+                               poll(NULL, 0, 1);
+                       _CMM_STORE_SHARED(crdp->cbs.head, NULL);
+                       cbs_tail = (struct cds_wfq_node **)
+                               uatomic_xchg(&crdp->cbs.tail, &crdp->cbs.head);
+                       synchronize_rcu();
+                       cbcount = 0;
+                       do {
+                               while (cbs->next == NULL &&
+                                      &cbs->next != cbs_tail)
+                                       poll(NULL, 0, 1);
+                               if (cbs == &crdp->cbs.dummy) {
+                                       cbs = cbs->next;
+                                       continue;
+                               }
+                               rhp = (struct rcu_head *)cbs;
+                               cbs = cbs->next;
+                               rhp->func(rhp);
+                               cbcount++;
+                       } while (cbs != NULL);
+                       uatomic_sub(&crdp->qlen, cbcount);
+               }
+               if (crdp->flags & URCU_CALL_RCU_STOP)
+                       break;
+               if (crdp->flags & URCU_CALL_RCU_RT)
+                       poll(NULL, 0, 10);
+               else {
+                       call_rcu_lock(&crdp->mtx);
+                       _CMM_STORE_SHARED(crdp->flags,
+                                    crdp->flags & ~URCU_CALL_RCU_RUNNING);
+                       if (&crdp->cbs.head ==
+                           _CMM_LOAD_SHARED(crdp->cbs.tail) &&
+                           pthread_cond_wait(&crdp->cond, &crdp->mtx) != 0) {
+                               perror("pthread_cond_wait");
+                               exit(-1);
+                       }
+                       _CMM_STORE_SHARED(crdp->flags,
+                                    crdp->flags | URCU_CALL_RCU_RUNNING);
+                       poll(NULL, 0, 10);
+                       call_rcu_unlock(&crdp->mtx);
+               }
+       }
+       call_rcu_lock(&crdp->mtx);
+       crdp->flags |= URCU_CALL_RCU_STOPPED;
+       call_rcu_unlock(&crdp->mtx);
+       return NULL;
+}
+
+/*
+ * Create both a call_rcu thread and the corresponding call_rcu_data
+ * structure, linking the structure in as specified.  Caller must hold
+ * call_rcu_mutex.
+ */
+
+static void call_rcu_data_init(struct call_rcu_data **crdpp,
+                              unsigned long flags)
+{
+       struct call_rcu_data *crdp;
+
+       crdp = malloc(sizeof(*crdp));
+       if (crdp == NULL) {
+               fprintf(stderr, "Out of memory.\n");
+               exit(-1);
+       }
+       memset(crdp, '\0', sizeof(*crdp));
+       cds_wfq_init(&crdp->cbs);
+       crdp->qlen = 0;
+       if (pthread_mutex_init(&crdp->mtx, NULL) != 0) {
+               perror("pthread_mutex_init");
+               exit(-1);
+       }
+       if (pthread_cond_init(&crdp->cond, NULL) != 0) {
+               perror("pthread_cond_init");
+               exit(-1);
+       }
+       crdp->flags = flags | URCU_CALL_RCU_RUNNING;
+       cds_list_add(&crdp->list, &call_rcu_data_list);
+       cmm_smp_mb();  /* Structure initialized before pointer is planted. */
+       *crdpp = crdp;
+       if (pthread_create(&crdp->tid, NULL, call_rcu_thread, crdp) != 0) {
+               perror("pthread_create");
+               exit(-1);
+       }
+}
+
+/*
+ * Return a pointer to the call_rcu_data structure for the specified
+ * CPU, returning NULL if there is none.  We cannot automatically
+ * created it because the platform we are running on might not define
+ * sched_getcpu().
+ */
+
+struct call_rcu_data *get_cpu_call_rcu_data(int cpu)
+{
+       static int warned = 0;
+
+       if (per_cpu_call_rcu_data == NULL)
+               return NULL;
+       if (!warned && maxcpus > 0 && (cpu < 0 || maxcpus <= cpu)) {
+               fprintf(stderr, "[error] liburcu: get CPU # out of range\n");
+               warned = 1;
+       }
+       if (cpu < 0 || maxcpus <= cpu)
+               return NULL;
+       return per_cpu_call_rcu_data[cpu];
+}
+
+/*
+ * Return the tid corresponding to the call_rcu thread whose
+ * call_rcu_data structure is specified.
+ */
+
+pthread_t get_call_rcu_thread(struct call_rcu_data *crdp)
+{
+       return crdp->tid;
+}
+
+/*
+ * Create a call_rcu_data structure (with thread) and return a pointer.
+ */
+
+static struct call_rcu_data *__create_call_rcu_data(unsigned long flags)
+{
+       struct call_rcu_data *crdp;
+
+       call_rcu_data_init(&crdp, flags);
+       return crdp;
+}
+
+struct call_rcu_data *create_call_rcu_data(unsigned long flags)
+{
+       struct call_rcu_data *crdp;
+
+       call_rcu_lock(&call_rcu_mutex);
+       crdp = __create_call_rcu_data(flags);
+       call_rcu_unlock(&call_rcu_mutex);
+       return crdp;
+}
+
+/*
+ * Set the specified CPU to use the specified call_rcu_data structure.
+ *
+ * Use NULL to remove a CPU's call_rcu_data structure, but it is
+ * the caller's responsibility to dispose of the removed structure.
+ * Use get_cpu_call_rcu_data() to obtain a pointer to the old structure
+ * (prior to NULLing it out, of course).
+ */
+
+int set_cpu_call_rcu_data(int cpu, struct call_rcu_data *crdp)
+{
+       int warned = 0;
+
+       call_rcu_lock(&call_rcu_mutex);
+       if (cpu < 0 || maxcpus <= cpu) {
+               if (!warned) {
+                       fprintf(stderr, "[error] liburcu: set CPU # out of range\n");
+                       warned = 1;
+               }
+               call_rcu_unlock(&call_rcu_mutex);
+               errno = EINVAL;
+               return -EINVAL;
+       }
+       alloc_cpu_call_rcu_data();
+       call_rcu_unlock(&call_rcu_mutex);
+       if (per_cpu_call_rcu_data == NULL) {
+               errno = ENOMEM;
+               return -ENOMEM;
+       }
+       per_cpu_call_rcu_data[cpu] = crdp;
+       return 0;
+}
+
+/*
+ * Return a pointer to the default call_rcu_data structure, creating
+ * one if need be.  Because we never free call_rcu_data structures,
+ * we don't need to be in an RCU read-side critical section.
+ */
+
+struct call_rcu_data *get_default_call_rcu_data(void)
+{
+       if (default_call_rcu_data != NULL)
+               return rcu_dereference(default_call_rcu_data);
+       call_rcu_lock(&call_rcu_mutex);
+       if (default_call_rcu_data != NULL) {
+               call_rcu_unlock(&call_rcu_mutex);
+               return default_call_rcu_data;
+       }
+       call_rcu_data_init(&default_call_rcu_data, 0);
+       call_rcu_unlock(&call_rcu_mutex);
+       return default_call_rcu_data;
+}
+
+/*
+ * Return the call_rcu_data structure that applies to the currently
+ * running thread.  Any call_rcu_data structure assigned specifically
+ * to this thread has first priority, followed by any call_rcu_data
+ * structure assigned to the CPU on which the thread is running,
+ * followed by the default call_rcu_data structure.  If there is not
+ * yet a default call_rcu_data structure, one will be created.
+ */
+struct call_rcu_data *get_call_rcu_data(void)
+{
+       int curcpu;
+       static int warned = 0;
+
+       if (thread_call_rcu_data != NULL)
+               return thread_call_rcu_data;
+       if (maxcpus <= 0)
+               return get_default_call_rcu_data();
+       curcpu = sched_getcpu();
+       if (!warned && (curcpu < 0 || maxcpus <= curcpu)) {
+               fprintf(stderr, "[error] liburcu: gcrd CPU # out of range\n");
+               warned = 1;
+       }
+       if (curcpu >= 0 && maxcpus > curcpu &&
+           per_cpu_call_rcu_data != NULL &&
+           per_cpu_call_rcu_data[curcpu] != NULL)
+               return per_cpu_call_rcu_data[curcpu];
+       return get_default_call_rcu_data();
+}
+
+/*
+ * Return a pointer to this task's call_rcu_data if there is one.
+ */
+
+struct call_rcu_data *get_thread_call_rcu_data(void)
+{
+       return thread_call_rcu_data;
+}
+
+/*
+ * Set this task's call_rcu_data structure as specified, regardless
+ * of whether or not this task already had one.  (This allows switching
+ * to and from real-time call_rcu threads, for example.)
+ *
+ * Use NULL to remove a thread's call_rcu_data structure, but it is
+ * the caller's responsibility to dispose of the removed structure.
+ * Use get_thread_call_rcu_data() to obtain a pointer to the old structure
+ * (prior to NULLing it out, of course).
+ */
+
+void set_thread_call_rcu_data(struct call_rcu_data *crdp)
+{
+       thread_call_rcu_data = crdp;
+}
+
+/*
+ * Create a separate call_rcu thread for each CPU.  This does not
+ * replace a pre-existing call_rcu thread -- use the set_cpu_call_rcu_data()
+ * function if you want that behavior.
+ */
+
+int create_all_cpu_call_rcu_data(unsigned long flags)
+{
+       int i;
+       struct call_rcu_data *crdp;
+       int ret;
+
+       call_rcu_lock(&call_rcu_mutex);
+       alloc_cpu_call_rcu_data();
+       call_rcu_unlock(&call_rcu_mutex);
+       if (maxcpus <= 0) {
+               errno = EINVAL;
+               return -EINVAL;
+       }
+       if (per_cpu_call_rcu_data == NULL) {
+               errno = ENOMEM;
+               return -ENOMEM;
+       }
+       for (i = 0; i < maxcpus; i++) {
+               call_rcu_lock(&call_rcu_mutex);
+               if (get_cpu_call_rcu_data(i)) {
+                       call_rcu_unlock(&call_rcu_mutex);
+                       continue;
+               }
+               crdp = __create_call_rcu_data(flags);
+               if (crdp == NULL) {
+                       call_rcu_unlock(&call_rcu_mutex);
+                       errno = ENOMEM;
+                       return -ENOMEM;
+               }
+               call_rcu_unlock(&call_rcu_mutex);
+               if ((ret = set_cpu_call_rcu_data(i, crdp)) != 0) {
+                       /* FIXME: Leaks crdp for now. */
+                       return ret; /* Can happen on race. */
+               }
+       }
+       return 0;
+}
+
+/*
+ * Wake up the call_rcu thread corresponding to the specified
+ * call_rcu_data structure.
+ */
+static void wake_call_rcu_thread(struct call_rcu_data *crdp)
+{
+       if (!(_CMM_LOAD_SHARED(crdp->flags) & URCU_CALL_RCU_RT)) {
+               call_rcu_lock(&crdp->mtx);
+               if (!(_CMM_LOAD_SHARED(crdp->flags) & URCU_CALL_RCU_RUNNING)) {
+                       if (pthread_cond_signal(&crdp->cond) != 0) {
+                               perror("pthread_cond_signal");
+                               exit(-1);
+                       }
+               }
+               call_rcu_unlock(&crdp->mtx);
+       }
+}
+
+/*
+ * Schedule a function to be invoked after a following grace period.
+ * This is the only function that must be called -- the others are
+ * only present to allow applications to tune their use of RCU for
+ * maximum performance.
+ *
+ * Note that unless a call_rcu thread has not already been created,
+ * the first invocation of call_rcu() will create one.  So, if you
+ * need the first invocation of call_rcu() to be fast, make sure
+ * to create a call_rcu thread first.  One way to accomplish this is
+ * "get_call_rcu_data();", and another is create_all_cpu_call_rcu_data().
+ */
+
+void call_rcu(struct rcu_head *head,
+             void (*func)(struct rcu_head *head))
+{
+       struct call_rcu_data *crdp;
+
+       cds_wfq_node_init(&head->next);
+       head->func = func;
+       crdp = get_call_rcu_data();
+       cds_wfq_enqueue(&crdp->cbs, &head->next);
+       uatomic_inc(&crdp->qlen);
+       wake_call_rcu_thread(crdp);
+}
+
+/*
+ * Free up the specified call_rcu_data structure, terminating the
+ * associated call_rcu thread.  The caller must have previously
+ * removed the call_rcu_data structure from per-thread or per-CPU
+ * usage.  For example, set_cpu_call_rcu_data(cpu, NULL) for per-CPU
+ * call_rcu_data structures or set_thread_call_rcu_data(NULL) for
+ * per-thread call_rcu_data structures.
+ *
+ * We silently refuse to free up the default call_rcu_data structure
+ * because that is where we put any leftover callbacks.  Note that
+ * the possibility of self-spawning callbacks makes it impossible
+ * to execute all the callbacks in finite time without putting any
+ * newly spawned callbacks somewhere else.  The "somewhere else" of
+ * last resort is the default call_rcu_data structure.
+ *
+ * We also silently refuse to free NULL pointers.  This simplifies
+ * the calling code.
+ */
+void call_rcu_data_free(struct call_rcu_data *crdp)
+{
+       struct cds_wfq_node *cbs;
+       struct cds_wfq_node **cbs_tail;
+       struct cds_wfq_node **cbs_endprev;
+
+       if (crdp == NULL || crdp == default_call_rcu_data) {
+               return;
+       }
+       if ((crdp->flags & URCU_CALL_RCU_STOPPED) == 0) {
+               call_rcu_lock(&crdp->mtx);
+               crdp->flags |= URCU_CALL_RCU_STOP;
+               call_rcu_unlock(&crdp->mtx);
+               wake_call_rcu_thread(crdp);
+               while ((crdp->flags & URCU_CALL_RCU_STOPPED) == 0)
+                       poll(NULL, 0, 1);
+       }
+       if (&crdp->cbs.head != _CMM_LOAD_SHARED(crdp->cbs.tail)) {
+               while ((cbs = _CMM_LOAD_SHARED(crdp->cbs.head)) == NULL)
+                       poll(NULL, 0, 1);
+               _CMM_STORE_SHARED(crdp->cbs.head, NULL);
+               cbs_tail = (struct cds_wfq_node **)
+                       uatomic_xchg(&crdp->cbs.tail, &crdp->cbs.head);
+               cbs_endprev = (struct cds_wfq_node **)
+                       uatomic_xchg(&default_call_rcu_data, cbs_tail);
+               *cbs_endprev = cbs;
+               uatomic_add(&default_call_rcu_data->qlen,
+                           uatomic_read(&crdp->qlen));
+               cds_list_del(&crdp->list);
+               free(crdp);
+       }
+}
+
+/*
+ * Clean up all the per-CPU call_rcu threads.
+ */
+void free_all_cpu_call_rcu_data(void)
+{
+       int cpu;
+       struct call_rcu_data *crdp;
+
+       if (maxcpus <= 0)
+               return;
+       for (cpu = 0; cpu < maxcpus; cpu++) {
+               crdp = get_cpu_call_rcu_data(cpu);
+               if (crdp == NULL)
+                       continue;
+               set_cpu_call_rcu_data(cpu, NULL);
+               call_rcu_data_free(crdp);
+       }
+}
+
+/*
+ * Acquire the call_rcu_mutex in order to ensure that the child sees
+ * all of the call_rcu() data structures in a consistent state.
+ * Suitable for pthread_atfork() and friends.
+ */
+void call_rcu_before_fork(void)
+{
+       call_rcu_lock(&call_rcu_mutex);
+}
+
+/*
+ * Clean up call_rcu data structures in the parent of a successful fork()
+ * that is not followed by exec() in the child.  Suitable for
+ * pthread_atfork() and friends.
+ */
+void call_rcu_after_fork_parent(void)
+{
+       call_rcu_unlock(&call_rcu_mutex);
+}
+
+/*
+ * Clean up call_rcu data structures in the child of a successful fork()
+ * that is not followed by exec().  Suitable for pthread_atfork() and
+ * friends.
+ */
+void call_rcu_after_fork_child(void)
+{
+       struct call_rcu_data *crdp;
+
+       /* Release the mutex. */
+       call_rcu_unlock(&call_rcu_mutex);
+
+       /*
+        * Allocate a new default call_rcu_data structure in order
+        * to get a working call_rcu thread to go with it.
+        */
+       default_call_rcu_data = NULL;
+       (void)get_default_call_rcu_data();
+
+       /* Dispose of all of the rest of the call_rcu_data structures. */
+       while (call_rcu_data_list.next != call_rcu_data_list.prev) {
+               crdp = cds_list_entry(call_rcu_data_list.prev,
+                                     struct call_rcu_data, list);
+               if (crdp == default_call_rcu_data)
+                       crdp = cds_list_entry(crdp->list.prev,
+                                             struct call_rcu_data, list);
+               crdp->flags = URCU_CALL_RCU_STOPPED;
+               call_rcu_data_free(crdp);
+       }
+}
diff --git a/urcu-call-rcu.c b/urcu-call-rcu.c
deleted file mode 100644 (file)
index 9cc56c5..0000000
+++ /dev/null
@@ -1,617 +0,0 @@
-/*
- * urcu-call-rcu.c
- *
- * Userspace RCU library - batch memory reclamation with kernel API
- *
- * Copyright (c) 2010 Paul E. McKenney <paulmck@linux.vnet.ibm.com>
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-#include <stdio.h>
-#include <pthread.h>
-#include <signal.h>
-#include <assert.h>
-#include <stdlib.h>
-#include <string.h>
-#include <errno.h>
-#include <poll.h>
-#include <sys/time.h>
-#include <syscall.h>
-#include <unistd.h>
-
-#include "config.h"
-#include "urcu/wfqueue.h"
-#include "urcu-call-rcu.h"
-#include "urcu-pointer.h"
-#include "urcu/list.h"
-
-/* Data structure that identifies a call_rcu thread. */
-
-struct call_rcu_data {
-       struct cds_wfq_queue cbs;
-       unsigned long flags;
-       pthread_mutex_t mtx;
-       pthread_cond_t cond;
-       unsigned long qlen;
-       pthread_t tid;
-       struct cds_list_head list;
-} __attribute__((aligned(CAA_CACHE_LINE_SIZE)));
-
-/*
- * List of all call_rcu_data structures to keep valgrind happy.
- * Protected by call_rcu_mutex.
- */
-
-CDS_LIST_HEAD(call_rcu_data_list);
-
-/* Link a thread using call_rcu() to its call_rcu thread. */
-
-static __thread struct call_rcu_data *thread_call_rcu_data;
-
-/* Guard call_rcu thread creation. */
-
-static pthread_mutex_t call_rcu_mutex = PTHREAD_MUTEX_INITIALIZER;
-
-/* If a given thread does not have its own call_rcu thread, this is default. */
-
-static struct call_rcu_data *default_call_rcu_data;
-
-extern void synchronize_rcu(void);
-
-/*
- * If the sched_getcpu() and sysconf(_SC_NPROCESSORS_CONF) calls are
- * available, then we can have call_rcu threads assigned to individual
- * CPUs rather than only to specific threads.
- */
-
-#if defined(HAVE_SCHED_GETCPU) && defined(HAVE_SYSCONF)
-
-/*
- * Pointer to array of pointers to per-CPU call_rcu_data structures
- * and # CPUs.
- */
-
-static struct call_rcu_data **per_cpu_call_rcu_data;
-static long maxcpus;
-
-/* Allocate the array if it has not already been allocated. */
-
-static void alloc_cpu_call_rcu_data(void)
-{
-       struct call_rcu_data **p;
-       static int warned = 0;
-
-       if (maxcpus != 0)
-               return;
-       maxcpus = sysconf(_SC_NPROCESSORS_CONF);
-       if (maxcpus <= 0) {
-               return;
-       }
-       p = malloc(maxcpus * sizeof(*per_cpu_call_rcu_data));
-       if (p != NULL) {
-               memset(p, '\0', maxcpus * sizeof(*per_cpu_call_rcu_data));
-               per_cpu_call_rcu_data = p;
-       } else {
-               if (!warned) {
-                       fprintf(stderr, "[error] liburcu: unable to allocate per-CPU pointer array\n");
-               }
-               warned = 1;
-       }
-}
-
-#else /* #if defined(HAVE_SCHED_GETCPU) && defined(HAVE_SYSCONF) */
-
-static const struct call_rcu_data **per_cpu_call_rcu_data = NULL;
-static const long maxcpus = -1;
-
-static void alloc_cpu_call_rcu_data(void)
-{
-}
-
-static int sched_getcpu(void)
-{
-       return -1;
-}
-
-#endif /* #else #if defined(HAVE_SCHED_GETCPU) && defined(HAVE_SYSCONF) */
-
-/* Acquire the specified pthread mutex. */
-
-static void call_rcu_lock(pthread_mutex_t *pmp)
-{
-       if (pthread_mutex_lock(pmp) != 0) {
-               perror("pthread_mutex_lock");
-               exit(-1);
-       }
-}
-
-/* Release the specified pthread mutex. */
-
-static void call_rcu_unlock(pthread_mutex_t *pmp)
-{
-       if (pthread_mutex_unlock(pmp) != 0) {
-               perror("pthread_mutex_unlock");
-               exit(-1);
-       }
-}
-
-/* This is the code run by each call_rcu thread. */
-
-static void *call_rcu_thread(void *arg)
-{
-       unsigned long cbcount;
-       struct cds_wfq_node *cbs;
-       struct cds_wfq_node **cbs_tail;
-       struct call_rcu_data *crdp = (struct call_rcu_data *)arg;
-       struct rcu_head *rhp;
-
-       thread_call_rcu_data = crdp;
-       for (;;) {
-               if (&crdp->cbs.head != _CMM_LOAD_SHARED(crdp->cbs.tail)) {
-                       while ((cbs = _CMM_LOAD_SHARED(crdp->cbs.head)) == NULL)
-                               poll(NULL, 0, 1);
-                       _CMM_STORE_SHARED(crdp->cbs.head, NULL);
-                       cbs_tail = (struct cds_wfq_node **)
-                               uatomic_xchg(&crdp->cbs.tail, &crdp->cbs.head);
-                       synchronize_rcu();
-                       cbcount = 0;
-                       do {
-                               while (cbs->next == NULL &&
-                                      &cbs->next != cbs_tail)
-                                       poll(NULL, 0, 1);
-                               if (cbs == &crdp->cbs.dummy) {
-                                       cbs = cbs->next;
-                                       continue;
-                               }
-                               rhp = (struct rcu_head *)cbs;
-                               cbs = cbs->next;
-                               rhp->func(rhp);
-                               cbcount++;
-                       } while (cbs != NULL);
-                       uatomic_sub(&crdp->qlen, cbcount);
-               }
-               if (crdp->flags & URCU_CALL_RCU_STOP)
-                       break;
-               if (crdp->flags & URCU_CALL_RCU_RT)
-                       poll(NULL, 0, 10);
-               else {
-                       call_rcu_lock(&crdp->mtx);
-                       _CMM_STORE_SHARED(crdp->flags,
-                                    crdp->flags & ~URCU_CALL_RCU_RUNNING);
-                       if (&crdp->cbs.head ==
-                           _CMM_LOAD_SHARED(crdp->cbs.tail) &&
-                           pthread_cond_wait(&crdp->cond, &crdp->mtx) != 0) {
-                               perror("pthread_cond_wait");
-                               exit(-1);
-                       }
-                       _CMM_STORE_SHARED(crdp->flags,
-                                    crdp->flags | URCU_CALL_RCU_RUNNING);
-                       poll(NULL, 0, 10);
-                       call_rcu_unlock(&crdp->mtx);
-               }
-       }
-       call_rcu_lock(&crdp->mtx);
-       crdp->flags |= URCU_CALL_RCU_STOPPED;
-       call_rcu_unlock(&crdp->mtx);
-       return NULL;
-}
-
-/*
- * Create both a call_rcu thread and the corresponding call_rcu_data
- * structure, linking the structure in as specified.  Caller must hold
- * call_rcu_mutex.
- */
-
-static void call_rcu_data_init(struct call_rcu_data **crdpp,
-                              unsigned long flags)
-{
-       struct call_rcu_data *crdp;
-
-       crdp = malloc(sizeof(*crdp));
-       if (crdp == NULL) {
-               fprintf(stderr, "Out of memory.\n");
-               exit(-1);
-       }
-       memset(crdp, '\0', sizeof(*crdp));
-       cds_wfq_init(&crdp->cbs);
-       crdp->qlen = 0;
-       if (pthread_mutex_init(&crdp->mtx, NULL) != 0) {
-               perror("pthread_mutex_init");
-               exit(-1);
-       }
-       if (pthread_cond_init(&crdp->cond, NULL) != 0) {
-               perror("pthread_cond_init");
-               exit(-1);
-       }
-       crdp->flags = flags | URCU_CALL_RCU_RUNNING;
-       cds_list_add(&crdp->list, &call_rcu_data_list);
-       cmm_smp_mb();  /* Structure initialized before pointer is planted. */
-       *crdpp = crdp;
-       if (pthread_create(&crdp->tid, NULL, call_rcu_thread, crdp) != 0) {
-               perror("pthread_create");
-               exit(-1);
-       }
-}
-
-/*
- * Return a pointer to the call_rcu_data structure for the specified
- * CPU, returning NULL if there is none.  We cannot automatically
- * created it because the platform we are running on might not define
- * sched_getcpu().
- */
-
-struct call_rcu_data *get_cpu_call_rcu_data(int cpu)
-{
-       static int warned = 0;
-
-       if (per_cpu_call_rcu_data == NULL)
-               return NULL;
-       if (!warned && maxcpus > 0 && (cpu < 0 || maxcpus <= cpu)) {
-               fprintf(stderr, "[error] liburcu: get CPU # out of range\n");
-               warned = 1;
-       }
-       if (cpu < 0 || maxcpus <= cpu)
-               return NULL;
-       return per_cpu_call_rcu_data[cpu];
-}
-
-/*
- * Return the tid corresponding to the call_rcu thread whose
- * call_rcu_data structure is specified.
- */
-
-pthread_t get_call_rcu_thread(struct call_rcu_data *crdp)
-{
-       return crdp->tid;
-}
-
-/*
- * Create a call_rcu_data structure (with thread) and return a pointer.
- */
-
-static struct call_rcu_data *__create_call_rcu_data(unsigned long flags)
-{
-       struct call_rcu_data *crdp;
-
-       call_rcu_data_init(&crdp, flags);
-       return crdp;
-}
-
-struct call_rcu_data *create_call_rcu_data(unsigned long flags)
-{
-       struct call_rcu_data *crdp;
-
-       call_rcu_lock(&call_rcu_mutex);
-       crdp = __create_call_rcu_data(flags);
-       call_rcu_unlock(&call_rcu_mutex);
-       return crdp;
-}
-
-/*
- * Set the specified CPU to use the specified call_rcu_data structure.
- *
- * Use NULL to remove a CPU's call_rcu_data structure, but it is
- * the caller's responsibility to dispose of the removed structure.
- * Use get_cpu_call_rcu_data() to obtain a pointer to the old structure
- * (prior to NULLing it out, of course).
- */
-
-int set_cpu_call_rcu_data(int cpu, struct call_rcu_data *crdp)
-{
-       int warned = 0;
-
-       call_rcu_lock(&call_rcu_mutex);
-       if (cpu < 0 || maxcpus <= cpu) {
-               if (!warned) {
-                       fprintf(stderr, "[error] liburcu: set CPU # out of range\n");
-                       warned = 1;
-               }
-               call_rcu_unlock(&call_rcu_mutex);
-               errno = EINVAL;
-               return -EINVAL;
-       }
-       alloc_cpu_call_rcu_data();
-       call_rcu_unlock(&call_rcu_mutex);
-       if (per_cpu_call_rcu_data == NULL) {
-               errno = ENOMEM;
-               return -ENOMEM;
-       }
-       per_cpu_call_rcu_data[cpu] = crdp;
-       return 0;
-}
-
-/*
- * Return a pointer to the default call_rcu_data structure, creating
- * one if need be.  Because we never free call_rcu_data structures,
- * we don't need to be in an RCU read-side critical section.
- */
-
-struct call_rcu_data *get_default_call_rcu_data(void)
-{
-       if (default_call_rcu_data != NULL)
-               return rcu_dereference(default_call_rcu_data);
-       call_rcu_lock(&call_rcu_mutex);
-       if (default_call_rcu_data != NULL) {
-               call_rcu_unlock(&call_rcu_mutex);
-               return default_call_rcu_data;
-       }
-       call_rcu_data_init(&default_call_rcu_data, 0);
-       call_rcu_unlock(&call_rcu_mutex);
-       return default_call_rcu_data;
-}
-
-/*
- * Return the call_rcu_data structure that applies to the currently
- * running thread.  Any call_rcu_data structure assigned specifically
- * to this thread has first priority, followed by any call_rcu_data
- * structure assigned to the CPU on which the thread is running,
- * followed by the default call_rcu_data structure.  If there is not
- * yet a default call_rcu_data structure, one will be created.
- */
-struct call_rcu_data *get_call_rcu_data(void)
-{
-       int curcpu;
-       static int warned = 0;
-
-       if (thread_call_rcu_data != NULL)
-               return thread_call_rcu_data;
-       if (maxcpus <= 0)
-               return get_default_call_rcu_data();
-       curcpu = sched_getcpu();
-       if (!warned && (curcpu < 0 || maxcpus <= curcpu)) {
-               fprintf(stderr, "[error] liburcu: gcrd CPU # out of range\n");
-               warned = 1;
-       }
-       if (curcpu >= 0 && maxcpus > curcpu &&
-           per_cpu_call_rcu_data != NULL &&
-           per_cpu_call_rcu_data[curcpu] != NULL)
-               return per_cpu_call_rcu_data[curcpu];
-       return get_default_call_rcu_data();
-}
-
-/*
- * Return a pointer to this task's call_rcu_data if there is one.
- */
-
-struct call_rcu_data *get_thread_call_rcu_data(void)
-{
-       return thread_call_rcu_data;
-}
-
-/*
- * Set this task's call_rcu_data structure as specified, regardless
- * of whether or not this task already had one.  (This allows switching
- * to and from real-time call_rcu threads, for example.)
- *
- * Use NULL to remove a thread's call_rcu_data structure, but it is
- * the caller's responsibility to dispose of the removed structure.
- * Use get_thread_call_rcu_data() to obtain a pointer to the old structure
- * (prior to NULLing it out, of course).
- */
-
-void set_thread_call_rcu_data(struct call_rcu_data *crdp)
-{
-       thread_call_rcu_data = crdp;
-}
-
-/*
- * Create a separate call_rcu thread for each CPU.  This does not
- * replace a pre-existing call_rcu thread -- use the set_cpu_call_rcu_data()
- * function if you want that behavior.
- */
-
-int create_all_cpu_call_rcu_data(unsigned long flags)
-{
-       int i;
-       struct call_rcu_data *crdp;
-       int ret;
-
-       call_rcu_lock(&call_rcu_mutex);
-       alloc_cpu_call_rcu_data();
-       call_rcu_unlock(&call_rcu_mutex);
-       if (maxcpus <= 0) {
-               errno = EINVAL;
-               return -EINVAL;
-       }
-       if (per_cpu_call_rcu_data == NULL) {
-               errno = ENOMEM;
-               return -ENOMEM;
-       }
-       for (i = 0; i < maxcpus; i++) {
-               call_rcu_lock(&call_rcu_mutex);
-               if (get_cpu_call_rcu_data(i)) {
-                       call_rcu_unlock(&call_rcu_mutex);
-                       continue;
-               }
-               crdp = __create_call_rcu_data(flags);
-               if (crdp == NULL) {
-                       call_rcu_unlock(&call_rcu_mutex);
-                       errno = ENOMEM;
-                       return -ENOMEM;
-               }
-               call_rcu_unlock(&call_rcu_mutex);
-               if ((ret = set_cpu_call_rcu_data(i, crdp)) != 0) {
-                       /* FIXME: Leaks crdp for now. */
-                       return ret; /* Can happen on race. */
-               }
-       }
-       return 0;
-}
-
-/*
- * Wake up the call_rcu thread corresponding to the specified
- * call_rcu_data structure.
- */
-static void wake_call_rcu_thread(struct call_rcu_data *crdp)
-{
-       if (!(_CMM_LOAD_SHARED(crdp->flags) & URCU_CALL_RCU_RT)) {
-               call_rcu_lock(&crdp->mtx);
-               if (!(_CMM_LOAD_SHARED(crdp->flags) & URCU_CALL_RCU_RUNNING)) {
-                       if (pthread_cond_signal(&crdp->cond) != 0) {
-                               perror("pthread_cond_signal");
-                               exit(-1);
-                       }
-               }
-               call_rcu_unlock(&crdp->mtx);
-       }
-}
-
-/*
- * Schedule a function to be invoked after a following grace period.
- * This is the only function that must be called -- the others are
- * only present to allow applications to tune their use of RCU for
- * maximum performance.
- *
- * Note that unless a call_rcu thread has not already been created,
- * the first invocation of call_rcu() will create one.  So, if you
- * need the first invocation of call_rcu() to be fast, make sure
- * to create a call_rcu thread first.  One way to accomplish this is
- * "get_call_rcu_data();", and another is create_all_cpu_call_rcu_data().
- */
-
-void call_rcu(struct rcu_head *head,
-             void (*func)(struct rcu_head *head))
-{
-       struct call_rcu_data *crdp;
-
-       cds_wfq_node_init(&head->next);
-       head->func = func;
-       crdp = get_call_rcu_data();
-       cds_wfq_enqueue(&crdp->cbs, &head->next);
-       uatomic_inc(&crdp->qlen);
-       wake_call_rcu_thread(crdp);
-}
-
-/*
- * Free up the specified call_rcu_data structure, terminating the
- * associated call_rcu thread.  The caller must have previously
- * removed the call_rcu_data structure from per-thread or per-CPU
- * usage.  For example, set_cpu_call_rcu_data(cpu, NULL) for per-CPU
- * call_rcu_data structures or set_thread_call_rcu_data(NULL) for
- * per-thread call_rcu_data structures.
- *
- * We silently refuse to free up the default call_rcu_data structure
- * because that is where we put any leftover callbacks.  Note that
- * the possibility of self-spawning callbacks makes it impossible
- * to execute all the callbacks in finite time without putting any
- * newly spawned callbacks somewhere else.  The "somewhere else" of
- * last resort is the default call_rcu_data structure.
- *
- * We also silently refuse to free NULL pointers.  This simplifies
- * the calling code.
- */
-void call_rcu_data_free(struct call_rcu_data *crdp)
-{
-       struct cds_wfq_node *cbs;
-       struct cds_wfq_node **cbs_tail;
-       struct cds_wfq_node **cbs_endprev;
-
-       if (crdp == NULL || crdp == default_call_rcu_data) {
-               return;
-       }
-       if ((crdp->flags & URCU_CALL_RCU_STOPPED) == 0) {
-               call_rcu_lock(&crdp->mtx);
-               crdp->flags |= URCU_CALL_RCU_STOP;
-               call_rcu_unlock(&crdp->mtx);
-               wake_call_rcu_thread(crdp);
-               while ((crdp->flags & URCU_CALL_RCU_STOPPED) == 0)
-                       poll(NULL, 0, 1);
-       }
-       if (&crdp->cbs.head != _CMM_LOAD_SHARED(crdp->cbs.tail)) {
-               while ((cbs = _CMM_LOAD_SHARED(crdp->cbs.head)) == NULL)
-                       poll(NULL, 0, 1);
-               _CMM_STORE_SHARED(crdp->cbs.head, NULL);
-               cbs_tail = (struct cds_wfq_node **)
-                       uatomic_xchg(&crdp->cbs.tail, &crdp->cbs.head);
-               cbs_endprev = (struct cds_wfq_node **)
-                       uatomic_xchg(&default_call_rcu_data, cbs_tail);
-               *cbs_endprev = cbs;
-               uatomic_add(&default_call_rcu_data->qlen,
-                           uatomic_read(&crdp->qlen));
-               cds_list_del(&crdp->list);
-               free(crdp);
-       }
-}
-
-/*
- * Clean up all the per-CPU call_rcu threads.
- */
-void free_all_cpu_call_rcu_data(void)
-{
-       int cpu;
-       struct call_rcu_data *crdp;
-
-       if (maxcpus <= 0)
-               return;
-       for (cpu = 0; cpu < maxcpus; cpu++) {
-               crdp = get_cpu_call_rcu_data(cpu);
-               if (crdp == NULL)
-                       continue;
-               set_cpu_call_rcu_data(cpu, NULL);
-               call_rcu_data_free(crdp);
-       }
-}
-
-/*
- * Acquire the call_rcu_mutex in order to ensure that the child sees
- * all of the call_rcu() data structures in a consistent state.
- * Suitable for pthread_atfork() and friends.
- */
-void call_rcu_before_fork(void)
-{
-       call_rcu_lock(&call_rcu_mutex);
-}
-
-/*
- * Clean up call_rcu data structures in the parent of a successful fork()
- * that is not followed by exec() in the child.  Suitable for
- * pthread_atfork() and friends.
- */
-void call_rcu_after_fork_parent(void)
-{
-       call_rcu_unlock(&call_rcu_mutex);
-}
-
-/*
- * Clean up call_rcu data structures in the child of a successful fork()
- * that is not followed by exec().  Suitable for pthread_atfork() and
- * friends.
- */
-void call_rcu_after_fork_child(void)
-{
-       struct call_rcu_data *crdp;
-
-       /* Release the mutex. */
-       call_rcu_unlock(&call_rcu_mutex);
-
-       /*
-        * Allocate a new default call_rcu_data structure in order
-        * to get a working call_rcu thread to go with it.
-        */
-       default_call_rcu_data = NULL;
-       (void)get_default_call_rcu_data();
-
-       /* Dispose of all of the rest of the call_rcu_data structures. */
-       while (call_rcu_data_list.next != call_rcu_data_list.prev) {
-               crdp = cds_list_entry(call_rcu_data_list.prev,
-                                     struct call_rcu_data, list);
-               if (crdp == default_call_rcu_data)
-                       crdp = cds_list_entry(crdp->list.prev,
-                                             struct call_rcu_data, list);
-               crdp->flags = URCU_CALL_RCU_STOPPED;
-               call_rcu_data_free(crdp);
-       }
-}
diff --git a/urcu-map.h b/urcu-map.h
new file mode 100644 (file)
index 0000000..eccaac2
--- /dev/null
@@ -0,0 +1,117 @@
+#ifndef _URCU_MAP_H
+#define _URCU_MAP_H
+
+/*
+ * urcu-map.h
+ *
+ * Userspace RCU header -- name mapping to allow multiple flavors to be
+ * used in the same executable.
+ *
+ * Copyright (c) 2009 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+ * Copyright (c) 2009 Paul E. McKenney, IBM Corporation.
+ *
+ * LGPL-compatible code should include this header with :
+ *
+ * #define _LGPL_SOURCE
+ * #include <urcu.h>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ *
+ * IBM's contributions to this file may be relicensed under LGPLv2 or later.
+ */
+
+/* Mapping macros to allow multiple flavors in a single binary. */
+
+#ifdef RCU_MEMBARRIER
+
+#define rcu_read_lock                  rcu_read_lock_memb
+#define _rcu_read_lock                 _rcu_read_lock_memb
+#define rcu_read_unlock                        rcu_read_unlock_memb
+#define _rcu_read_unlock               _rcu_read_unlock_memb
+#define rcu_register_thread            rcu_register_thread_memb
+#define rcu_unregister_thread          rcu_unregister_thread_memb
+#define rcu_init                       rcu_init_memb
+#define rcu_exit                       rcu_exit_memb
+#define synchronize_rcu                        synchronize_rcu_memb
+#define rcu_reader                     rcu_reader_memb
+#define rcu_gp_ctr                     rcu_gp_ctr_memb
+
+#define get_cpu_call_rcu_data          get_cpu_call_rcu_data_memb
+#define get_call_rcu_thread            get_call_rcu_thread_memb
+#define create_call_rcu_data           create_call_rcu_data_memb
+#define set_cpu_call_rcu_data          set_cpu_call_rcu_data_memb
+#define get_default_call_rcu_data      get_default_call_rcu_data_memb
+#define get_call_rcu_data              get_call_rcu_data_memb
+#define get_thread_call_rcu_data       get_thread_call_rcu_data_memb
+#define set_thread_call_rcu_data       set_thread_call_rcu_data_memb
+#define create_all_cpu_call_rcu_data   create_all_cpu_call_rcu_data_memb
+#define free_all_cpu_call_rcu_data     free_all_cpu_call_rcu_data_memb
+#define call_rcu                       call_rcu_memb
+
+#elif defined(RCU_SIGNAL)
+
+#define rcu_read_lock                  rcu_read_lock_sig
+#define _rcu_read_lock                 _rcu_read_lock_sig
+#define rcu_read_unlock                        rcu_read_unlock_sig
+#define _rcu_read_unlock               _rcu_read_unlock_sig
+#define rcu_register_thread            rcu_register_thread_sig
+#define rcu_unregister_thread          rcu_unregister_thread_sig
+#define rcu_init                       rcu_init_sig
+#define rcu_exit                       rcu_exit_sig
+#define synchronize_rcu                        synchronize_rcu_sig
+#define rcu_reader                     rcu_reader_sig
+#define rcu_gp_ctr                     rcu_gp_ctr_sig
+
+#define get_cpu_call_rcu_data          get_cpu_call_rcu_data_sig
+#define get_call_rcu_thread            get_call_rcu_thread_sig
+#define create_call_rcu_data           create_call_rcu_data_sig
+#define set_cpu_call_rcu_data          set_cpu_call_rcu_data_sig
+#define get_default_call_rcu_data      get_default_call_rcu_data_sig
+#define get_call_rcu_data              get_call_rcu_data_sig
+#define get_thread_call_rcu_data       get_thread_call_rcu_data_sig
+#define set_thread_call_rcu_data       set_thread_call_rcu_data_sig
+#define create_all_cpu_call_rcu_data   create_all_cpu_call_rcu_data_sig
+#define free_all_cpu_call_rcu_data     free_all_cpu_call_rcu_data_sig
+#define call_rcu                       call_rcu_sig
+
+#elif defined(RCU_MB)
+
+#define rcu_read_lock                  rcu_read_lock_mb
+#define _rcu_read_lock                 _rcu_read_lock_mb
+#define rcu_read_unlock                        rcu_read_unlock_mb
+#define _rcu_read_unlock               _rcu_read_unlock_mb
+#define rcu_register_thread            rcu_register_thread_mb
+#define rcu_unregister_thread          rcu_unregister_thread_mb
+#define rcu_init                       rcu_init_mb
+#define rcu_exit                       rcu_exit_mb
+#define synchronize_rcu                        synchronize_rcu_mb
+#define rcu_reader                     rcu_reader_mb
+#define rcu_gp_ctr                     rcu_gp_ctr_mb
+
+#define get_cpu_call_rcu_data          get_cpu_call_rcu_data_mb
+#define get_call_rcu_thread            get_call_rcu_thread_mb
+#define create_call_rcu_data           create_call_rcu_data_mb
+#define set_cpu_call_rcu_data          set_cpu_call_rcu_data_mb
+#define get_default_call_rcu_data      get_default_call_rcu_data_mb
+#define get_call_rcu_data              get_call_rcu_data_mb
+#define get_thread_call_rcu_data       get_thread_call_rcu_data_mb
+#define set_thread_call_rcu_data       set_thread_call_rcu_data_mb
+#define create_all_cpu_call_rcu_data   create_all_cpu_call_rcu_data_mb
+#define free_all_cpu_call_rcu_data     free_all_cpu_call_rcu_data_mb
+#define call_rcu                       call_rcu_mb
+
+#endif
+
+#endif /* _URCU_MAP_H */
diff --git a/urcu-qsbr-map.h b/urcu-qsbr-map.h
new file mode 100644 (file)
index 0000000..2bce1b6
--- /dev/null
@@ -0,0 +1,63 @@
+#ifndef _URCU_QSBR_MAP_H
+#define _URCU_QSBR_MAP_H
+
+/*
+ * urcu-map.h
+ *
+ * Userspace RCU header -- name mapping to allow multiple flavors to be
+ * used in the same executable.
+ *
+ * Copyright (c) 2009 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+ * Copyright (c) 2009 Paul E. McKenney, IBM Corporation.
+ *
+ * LGPL-compatible code should include this header with :
+ *
+ * #define _LGPL_SOURCE
+ * #include <urcu.h>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ *
+ * IBM's contributions to this file may be relicensed under LGPLv2 or later.
+ */
+
+/* Mapping macros to allow multiple flavors in a single binary. */
+
+#define rcu_read_lock                  rcu_read_lock_qsbr
+#define _rcu_read_lock                 _rcu_read_lock_qsbr
+#define rcu_read_unlock                        rcu_read_unlock_qsbr
+#define _rcu_read_unlock               _rcu_read_unlock_qsbr
+#define rcu_quiescent_state            rcu_quiescent_state_qsbr
+#define _rcu_quiescent_state           _rcu_quiescent_state_qsbr
+#define rcu_thread_offline             rcu_thread_offline_qsbr
+#define rcu_thread_online              rcu_thread_online_qsbr
+#define rcu_register_thread            rcu_register_thread_qsbr
+#define rcu_unregister_thread          rcu_unregister_thread_qsbr
+#define rcu_exit                       rcu_exit_qsbr
+#define synchronize_rcu                        synchronize_rcu_qsbr
+#define rcu_reader                     rcu_reader_qsbr
+#define rcu_gp_ctr                     rcu_gp_ctr_qsbr
+
+#define get_cpu_call_rcu_data          get_cpu_call_rcu_data_qsbr
+#define get_call_rcu_thread            get_call_rcu_thread_qsbr
+#define create_call_rcu_data           create_call_rcu_data_qsbr
+#define set_cpu_call_rcu_data          set_cpu_call_rcu_data_qsbr
+#define get_default_call_rcu_data      get_default_call_rcu_data_qsbr
+#define get_call_rcu_data              get_call_rcu_data_qsbr
+#define get_thread_call_rcu_data       get_thread_call_rcu_data_qsbr
+#define set_thread_call_rcu_data       set_thread_call_rcu_data_qsbr
+#define create_all_cpu_call_rcu_data   create_all_cpu_call_rcu_data_qsbr
+#define call_rcu                       call_rcu_qsbr
+
+#endif /* _URCU_QSBR_MAP_H */
index 69effd5..8dcad33 100644 (file)
@@ -32,6 +32,8 @@
 #include <errno.h>
 #include <poll.h>
 
+#include "urcu-qsbr-map.h"
+
 #define BUILD_QSBR_LIB
 #include "urcu-qsbr-static.h"
 /* Do not #define _LGPL_SOURCE to ensure we can emit the wrapper symbols */
@@ -121,10 +123,11 @@ static void update_counter_and_wait(void)
 #endif /* !(CAA_BITS_PER_LONG < 64) */
 
        /*
-        * Must commit rcu_gp_ctr update to memory before waiting for quiescent
-        * state. Failure to do so could result in the writer waiting forever
-        * while new readers are always accessing data (no progress). Enforce
-        * compiler-order of store to rcu_gp_ctr before load rcu_reader ctr.
+        * Must commit rcu_gp_ctr update to memory before waiting for
+        * quiescent state. Failure to do so could result in the writer
+        * waiting forever while new readers are always accessing data
+        * (no progress). Enforce compiler-order of store to rcu_gp_ctr
+        * before load rcu_reader ctr.
         */
        cmm_barrier();
 
@@ -194,8 +197,8 @@ void synchronize_rcu(void)
 
        /*
         * Mark the writer thread offline to make sure we don't wait for
-        * our own quiescent state. This allows using synchronize_rcu() in
-        * threads registered as readers.
+        * our own quiescent state. This allows using synchronize_rcu()
+        * in threads registered as readers.
         */
        if (was_online)
                CMM_STORE_SHARED(rcu_reader.ctr, 0);
@@ -212,10 +215,11 @@ void synchronize_rcu(void)
 
        /*
         * Must finish waiting for quiescent state for parity 0 before
-        * committing next rcu_gp_ctr update to memory. Failure to do so could
-        * result in the writer waiting forever while new readers are always
-        * accessing data (no progress).  Enforce compiler-order of load
-        * rcu_reader ctr before store to rcu_gp_ctr.
+        * committing next rcu_gp_ctr update to memory. Failure to
+        * do so could result in the writer waiting forever while new
+        * readers are always accessing data (no progress).  Enforce
+        * compiler-order of load rcu_reader ctr before store to
+        * rcu_gp_ctr.
         */
        cmm_barrier();
 
@@ -238,7 +242,8 @@ out:
         * freed.
         */
        if (was_online)
-               _CMM_STORE_SHARED(rcu_reader.ctr, CMM_LOAD_SHARED(rcu_gp_ctr));
+               _CMM_STORE_SHARED(rcu_reader.ctr,
+                                 CMM_LOAD_SHARED(rcu_gp_ctr));
        cmm_smp_mb();
 }
 #else /* !(CAA_BITS_PER_LONG < 64) */
@@ -250,8 +255,8 @@ void synchronize_rcu(void)
 
        /*
         * Mark the writer thread offline to make sure we don't wait for
-        * our own quiescent state. This allows using synchronize_rcu() in
-        * threads registered as readers.
+        * our own quiescent state. This allows using synchronize_rcu()
+        * in threads registered as readers.
         */
        cmm_smp_mb();
        if (was_online)
@@ -265,7 +270,8 @@ out:
        mutex_unlock(&rcu_gp_lock);
 
        if (was_online)
-               _CMM_STORE_SHARED(rcu_reader.ctr, CMM_LOAD_SHARED(rcu_gp_ctr));
+               _CMM_STORE_SHARED(rcu_reader.ctr,
+                                 CMM_LOAD_SHARED(rcu_gp_ctr));
        cmm_smp_mb();
 }
 #endif  /* !(CAA_BITS_PER_LONG < 64) */
@@ -326,3 +332,5 @@ void rcu_exit(void)
 {
        assert(cds_list_empty(&registry));
 }
+
+#include "urcu-call-rcu-impl.h"
index 116fd77..984d70c 100644 (file)
@@ -40,6 +40,8 @@
 extern "C" {
 #endif 
 
+#include "urcu-qsbr-map.h"
+
 /*
  * Important !
  *
@@ -62,15 +64,15 @@ extern "C" {
  * rcu_read_unlock()
  *
  * Mark the beginning and end of a read-side critical section.
- * DON'T FORGET TO USE rcu_register_thread/rcu_unregister_thread() FOR EACH
- * THREAD WITH READ-SIDE CRITICAL SECTION.
+ * DON'T FORGET TO USE rcu_register_thread/rcu_unregister_thread()
+ * FOR EACH THREAD WITH READ-SIDE CRITICAL SECTION.
  */
-#define rcu_read_lock()                _rcu_read_lock()
-#define rcu_read_unlock()      _rcu_read_unlock()
+#define rcu_read_lock_qsbr()           _rcu_read_lock()
+#define rcu_read_unlock_qsbr()         _rcu_read_unlock()
 
-#define rcu_quiescent_state()  _rcu_quiescent_state()
-#define rcu_thread_offline()   _rcu_thread_offline()
-#define rcu_thread_online()    _rcu_thread_online()
+#define rcu_quiescent_state_qsbr()     _rcu_quiescent_state()
+#define rcu_thread_offline_qsbr()      _rcu_thread_offline()
+#define rcu_thread_online_qsbr()       _rcu_thread_online()
 
 #else /* !_LGPL_SOURCE */
 
@@ -122,4 +124,6 @@ extern void rcu_unregister_thread(void);
 }
 #endif
 
+#include "urcu-call-rcu.h"
+
 #endif /* _URCU_QSBR_H */
diff --git a/urcu.c b/urcu.c
index e529ac0..4ee9e3b 100644 (file)
--- a/urcu.c
+++ b/urcu.c
@@ -33,6 +33,8 @@
 #include <errno.h>
 #include <poll.h>
 
+#include "urcu-map.h"
+
 #include "urcu-static.h"
 /* Do not #define _LGPL_SOURCE to ensure we can emit the wrapper symbols */
 #include "urcu.h"
@@ -428,4 +430,7 @@ void rcu_exit(void)
        assert(act.sa_sigaction == sigrcu_handler);
        assert(cds_list_empty(&registry));
 }
+
 #endif /* #ifdef RCU_SIGNAL */
+
+#include "urcu-call-rcu-impl.h"
diff --git a/urcu.h b/urcu.h
index c6c54e7..00d9b75 100644 (file)
--- a/urcu.h
+++ b/urcu.h
 extern "C" {
 #endif 
 
+#include "urcu-map.h"
+
 /*
  * Important !
  *
  * Each thread containing read-side critical sections must be registered
- * with rcu_register_thread() before calling rcu_read_lock().
- * rcu_unregister_thread() should be called before the thread exits.
+ * with rcu_register_thread_mb() before calling rcu_read_lock_mb().
+ * rcu_unregister_thread_mb() should be called before the thread exits.
  */
 
 #ifdef _LGPL_SOURCE
@@ -68,8 +70,16 @@ extern "C" {
  * DON'T FORGET TO USE RCU_REGISTER/UNREGISTER_THREAD() FOR EACH THREAD WITH
  * READ-SIDE CRITICAL SECTION.
  */
-#define rcu_read_lock()                _rcu_read_lock()
-#define rcu_read_unlock()      _rcu_read_unlock()
+#ifdef RCU_MEMBARRIER
+#define rcu_read_lock_memb()           _rcu_read_lock()
+#define rcu_read_unlock_memb()         _rcu_read_unlock()
+#elif defined(RCU_SIGNAL)
+#define rcu_read_lock_sig()            _rcu_read_lock()
+#define rcu_read_unlock_sig()          _rcu_read_unlock()
+#elif defined(RCU_MB)
+#define rcu_read_lock_mb()             _rcu_read_lock()
+#define rcu_read_unlock_mb()           _rcu_read_unlock()
+#endif
 
 #else /* !_LGPL_SOURCE */
 
@@ -100,4 +110,6 @@ extern void rcu_init(void);
 }
 #endif
 
+#include "urcu-call-rcu.h"
+
 #endif /* _URCU_H */
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