Update version to 0.7.4

[urcu.git] / urcu-bp.c

diff --git a/urcu-bp.c b/urcu-bp.c
index 273acb88cf2d1749e57bb840bc6e78ab414ebf1d..b9c89d899ea0d744246aa369d8417d8b5a1c4cec 100644 (file)
--- a/urcu-bp.c
+++ b/urcu-bp.c
@@ -24,6 +24,7 @@
  */
 
 #define _GNU_SOURCE
+#define _LGPL_SOURCE
 #include <stdio.h>
 #include <pthread.h>
 #include <signal.h>
@@ -35,17 +36,31 @@
 #include <unistd.h>
 #include <sys/mman.h>
 
+#include "urcu/wfqueue.h"
 #include "urcu/map/urcu-bp.h"
-
 #include "urcu/static/urcu-bp.h"
+#include "urcu-pointer.h"
+#include "urcu/tls-compat.h"
+
+#include "urcu-die.h"
+
 /* Do not #define _LGPL_SOURCE to ensure we can emit the wrapper symbols */
+#undef _LGPL_SOURCE
 #include "urcu-bp.h"
+#define _LGPL_SOURCE
 
 #ifndef MAP_ANONYMOUS
 #define MAP_ANONYMOUS MAP_ANON
 #endif
 
-#ifndef __linux__
+#ifdef __linux__
+static
+void *mremap_wrapper(void *old_address, size_t old_size,
+               size_t new_size, int flags)
+{
+       return mremap(old_address, old_size, new_size, flags);
+}
+#else
 
 #define MREMAP_MAYMOVE 1
 #define MREMAP_FIXED   2
@@ -54,7 +69,9 @@
  * mremap wrapper for non-Linux systems. Maps a RW, anonymous private mapping.
  * This is not generic.
 */
-void *mremap(void *old_address, size_t old_size, size_t new_size, int flags)
+static
+void *mremap_wrapper(void *old_address, size_t old_size,
+               size_t new_size, int flags)
 {
        void *new_address;
 
@@ -78,13 +95,18 @@ void *mremap(void *old_address, size_t old_size, size_t new_size, int flags)
 #define RCU_SLEEP_DELAY                1000
 #define ARENA_INIT_ALLOC       16
 
+/*
+ * Active attempts to check for reader Q.S. before calling sleep().
+ */
+#define RCU_QS_ACTIVE_ATTEMPTS 100
+
 void __attribute__((destructor)) rcu_bp_exit(void);
 
 static pthread_mutex_t rcu_gp_lock = PTHREAD_MUTEX_INITIALIZER;
 
 #ifdef DEBUG_YIELD
 unsigned int yield_active;
-unsigned int __thread rand_yield;
+DEFINE_URCU_TLS(unsigned int, rand_yield);
 #endif
 
 /*
@@ -99,7 +121,7 @@ long rcu_gp_ctr = RCU_GP_COUNT;
  * Pointer to registry elements. Written to only by each individual reader. Read
  * by both the reader and the writers.
  */
-struct rcu_reader __thread *rcu_reader;
+DEFINE_URCU_TLS(struct rcu_reader *, rcu_reader);
 
 static CDS_LIST_HEAD(registry);
 
@@ -122,17 +144,12 @@ static void mutex_lock(pthread_mutex_t *mutex)
 
 #ifndef DISTRUST_SIGNALS_EXTREME
        ret = pthread_mutex_lock(mutex);
-       if (ret) {
-               perror("Error in pthread mutex lock");
-               exit(-1);
-       }
+       if (ret)
+               urcu_die(ret);
 #else /* #ifndef DISTRUST_SIGNALS_EXTREME */
        while ((ret = pthread_mutex_trylock(mutex)) != 0) {
-               if (ret != EBUSY && ret != EINTR) {
-                       printf("ret = %d, errno = %d\n", ret, errno);
-                       perror("Error in pthread mutex lock");
-                       exit(-1);
-               }
+               if (ret != EBUSY && ret != EINTR)
+                       urcu_die(ret);
                poll(NULL,0,10);
        }
 #endif /* #else #ifndef DISTRUST_SIGNALS_EXTREME */
@@ -143,10 +160,8 @@ static void mutex_unlock(pthread_mutex_t *mutex)
        int ret;
 
        ret = pthread_mutex_unlock(mutex);
-       if (ret) {
-               perror("Error in pthread mutex unlock");
-               exit(-1);
-       }
+       if (ret)
+               urcu_die(ret);
 }
 
 void update_counter_and_wait(void)
@@ -273,8 +288,8 @@ static void resize_arena(struct registry_arena *arena, size_t len)
                                 MAP_ANONYMOUS | MAP_PRIVATE,
                                 -1, 0);
        else
-               new_arena = mremap(arena->p, arena->len,
-                                  len, MREMAP_MAYMOVE);
+               new_arena = mremap_wrapper(arena->p, arena->len,
+                                       len, MREMAP_MAYMOVE);
        assert(new_arena != MAP_FAILED);
 
        /*
@@ -312,7 +327,7 @@ static void add_thread(void)
        rcu_reader_reg->tid = pthread_self();
        assert(rcu_reader_reg->ctr == 0);
        cds_list_add(&rcu_reader_reg->node, &registry);
-       rcu_reader = rcu_reader_reg;
+       URCU_TLS(rcu_reader) = rcu_reader_reg;
 }
 
 /* Called with signals off and mutex locked */
@@ -353,7 +368,7 @@ void rcu_bp_register(void)
        /*
         * Check if a signal concurrently registered our thread since
         * the check in rcu_read_lock(). */
-       if (rcu_reader)
+       if (URCU_TLS(rcu_reader))
                goto end;
 
        mutex_lock(&rcu_gp_lock);
@@ -364,9 +379,10 @@ end:
        assert(!ret);
 }
 
-void rcu_bp_exit()
+void rcu_bp_exit(void)
 {
-       munmap(registry_arena.p, registry_arena.len);
+       if (registry_arena.p)
+               munmap(registry_arena.p, registry_arena.len);
 }
 
 /*
@@ -410,5 +426,31 @@ void rcu_bp_after_fork_child(void)
        assert(!ret);
 }
 
+void *rcu_dereference_sym_bp(void *p)
+{
+       return _rcu_dereference(p);
+}
+
+void *rcu_set_pointer_sym_bp(void **p, void *v)
+{
+       cmm_wmb();
+       uatomic_set(p, v);
+       return v;
+}
+
+void *rcu_xchg_pointer_sym_bp(void **p, void *v)
+{
+       cmm_wmb();
+       return uatomic_xchg(p, v);
+}
+
+void *rcu_cmpxchg_pointer_sym_bp(void **p, void *old, void *_new)
+{
+       cmm_wmb();
+       return uatomic_cmpxchg(p, old, _new);
+}
+
+DEFINE_RCU_FLAVOR(rcu_flavor);
+
 #include "urcu-call-rcu-impl.h"
 #include "urcu-defer-impl.h"