Refactor liburcu to support many flavors per compile unit

[urcu.git] / src / urcu.c

diff --git a/src/urcu.c b/src/urcu.c
index c47f51b53330322468cd5a6b870eab612907fb68..c36119aeb466673c03c810dc2ea372eea568f10f 100644 (file)
--- a/src/urcu.c
+++ b/src/urcu.c
@@ -37,19 +37,21 @@
 #include <stdbool.h>
 #include <poll.h>
 
-#include "urcu/arch.h"
-#include "urcu/wfcqueue.h"
-#include "urcu/map/urcu.h"
-#include "urcu/static/urcu.h"
-#include "urcu-pointer.h"
-#include "urcu/tls-compat.h"
+#include <urcu/arch.h>
+#include <urcu/wfcqueue.h>
+#include <urcu/map/urcu.h>
+#include <urcu/static/urcu.h>
+#include <urcu/pointer.h>
+#include <urcu/tls-compat.h>
 
 #include "urcu-die.h"
 #include "urcu-wait.h"
+#include "urcu-utils.h"
 
+#define URCU_API_MAP
 /* Do not #define _LGPL_SOURCE to ensure we can emit the wrapper symbols */
 #undef _LGPL_SOURCE
-#include "urcu.h"
+#include <urcu/urcu.h>
 #define _LGPL_SOURCE
 
 /*
@@ -82,10 +84,16 @@ enum membarrier_cmd {
 
 #ifdef RCU_MEMBARRIER
 static int init_done;
-static int has_sys_membarrier_private_expedited;
+static int urcu_memb_has_sys_membarrier_private_expedited;
 
 #ifndef CONFIG_RCU_FORCE_SYS_MEMBARRIER
-int rcu_has_sys_membarrier_memb;
+/*
+ * Explicitly initialize to zero because we can't alias a non-static
+ * uninitialized variable.
+ */
+int urcu_memb_has_sys_membarrier = 0;
+__attribute__((alias("urcu_memb_has_sys_membarrier")))
+extern int rcu_has_sys_membarrier_memb;
 #endif
 
 void __attribute__((constructor)) rcu_init(void);
@@ -95,6 +103,8 @@ void __attribute__((constructor)) rcu_init(void);
 void rcu_init(void)
 {
 }
+__attribute__((alias(urcu_stringify(rcu_init))))
+void alias_rcu_init(void);
 #endif
 
 #ifdef RCU_SIGNAL
@@ -119,13 +129,17 @@ static pthread_mutex_t rcu_gp_lock = PTHREAD_MUTEX_INITIALIZER;
  * rcu_registry_lock may nest inside rcu_gp_lock.
  */
 static pthread_mutex_t rcu_registry_lock = PTHREAD_MUTEX_INITIALIZER;
-struct rcu_gp rcu_gp = { .ctr = RCU_GP_COUNT };
+struct urcu_gp rcu_gp = { .ctr = URCU_GP_COUNT };
+__attribute__((alias(urcu_stringify(rcu_gp))))
+extern struct urcu_gp alias_rcu_gp;
 
 /*
  * Written to only by each individual reader. Read by both the reader and the
  * writers.
  */
-DEFINE_URCU_TLS(struct rcu_reader, rcu_reader);
+DEFINE_URCU_TLS(struct urcu_reader, rcu_reader);
+__attribute__((alias(urcu_stringify(rcu_reader))))
+extern struct urcu_reader alias_rcu_reader;
 
 static CDS_LIST_HEAD(registry);
 
@@ -169,8 +183,8 @@ static void mutex_unlock(pthread_mutex_t *mutex)
 #ifdef RCU_MEMBARRIER
 static void smp_mb_master(void)
 {
-       if (caa_likely(rcu_has_sys_membarrier_memb)) {
-               if (membarrier(has_sys_membarrier_private_expedited ?
+       if (caa_likely(urcu_memb_has_sys_membarrier)) {
+               if (membarrier(urcu_memb_has_sys_membarrier_private_expedited ?
                                MEMBARRIER_CMD_PRIVATE_EXPEDITED :
                                MEMBARRIER_CMD_SHARED, 0))
                        urcu_die(errno);
@@ -190,7 +204,7 @@ static void smp_mb_master(void)
 #ifdef RCU_SIGNAL
 static void force_mb_all_readers(void)
 {
-       struct rcu_reader *index;
+       struct urcu_reader *index;
 
        /*
         * Ask for each threads to execute a cmm_smp_mb() so we can consider the
@@ -283,7 +297,7 @@ static void wait_for_readers(struct cds_list_head *input_readers,
                        struct cds_list_head *qsreaders)
 {
        unsigned int wait_loops = 0;
-       struct rcu_reader *index, *tmp;
+       struct urcu_reader *index, *tmp;
 #ifdef HAS_INCOHERENT_CACHES
        unsigned int wait_gp_loops = 0;
 #endif /* HAS_INCOHERENT_CACHES */
@@ -303,18 +317,18 @@ static void wait_for_readers(struct cds_list_head *input_readers,
                }
 
                cds_list_for_each_entry_safe(index, tmp, input_readers, node) {
-                       switch (rcu_reader_state(&index->ctr)) {
-                       case RCU_READER_ACTIVE_CURRENT:
+                       switch (urcu_common_reader_state(&rcu_gp, &index->ctr)) {
+                       case URCU_READER_ACTIVE_CURRENT:
                                if (cur_snap_readers) {
                                        cds_list_move(&index->node,
                                                cur_snap_readers);
                                        break;
                                }
                                /* Fall-through */
-                       case RCU_READER_INACTIVE:
+                       case URCU_READER_INACTIVE:
                                cds_list_move(&index->node, qsreaders);
                                break;
-                       case RCU_READER_ACTIVE_OLD:
+                       case URCU_READER_ACTIVE_OLD:
                                /*
                                 * Old snapshot. Leaving node in
                                 * input_readers will make us busy-loop
@@ -454,7 +468,7 @@ void synchronize_rcu(void)
        cmm_smp_mb();
 
        /* Switch parity: 0 -> 1, 1 -> 0 */
-       CMM_STORE_SHARED(rcu_gp.ctr, rcu_gp.ctr ^ RCU_GP_CTR_PHASE);
+       CMM_STORE_SHARED(rcu_gp.ctr, rcu_gp.ctr ^ URCU_GP_CTR_PHASE);
 
        /*
         * Must commit rcu_gp.ctr update to memory before waiting for quiescent
@@ -501,6 +515,8 @@ out:
         */
        urcu_wake_all_waiters(&waiters);
 }
+__attribute__((alias(urcu_stringify(synchronize_rcu))))
+void alias_synchronize_rcu();
 
 /*
  * library wrappers to be used by non-LGPL compatible source code.
@@ -510,22 +526,28 @@ void rcu_read_lock(void)
 {
        _rcu_read_lock();
 }
+__attribute__((alias(urcu_stringify(rcu_read_lock))))
+void alias_rcu_read_lock();
 
 void rcu_read_unlock(void)
 {
        _rcu_read_unlock();
 }
+__attribute__((alias(urcu_stringify(rcu_read_unlock))))
+void alias_rcu_read_unlock();
 
 int rcu_read_ongoing(void)
 {
        return _rcu_read_ongoing();
 }
+__attribute__((alias(urcu_stringify(rcu_read_ongoing))))
+void alias_rcu_read_ongoing();
 
 void rcu_register_thread(void)
 {
        URCU_TLS(rcu_reader).tid = pthread_self();
        assert(URCU_TLS(rcu_reader).need_mb == 0);
-       assert(!(URCU_TLS(rcu_reader).ctr & RCU_GP_CTR_NEST_MASK));
+       assert(!(URCU_TLS(rcu_reader).ctr & URCU_GP_CTR_NEST_MASK));
 
        mutex_lock(&rcu_registry_lock);
        assert(!URCU_TLS(rcu_reader).registered);
@@ -534,6 +556,8 @@ void rcu_register_thread(void)
        cds_list_add(&URCU_TLS(rcu_reader).node, &registry);
        mutex_unlock(&rcu_registry_lock);
 }
+__attribute__((alias(urcu_stringify(rcu_register_thread))))
+void alias_rcu_register_thread();
 
 void rcu_unregister_thread(void)
 {
@@ -543,6 +567,8 @@ void rcu_unregister_thread(void)
        cds_list_del(&URCU_TLS(rcu_reader).node);
        mutex_unlock(&rcu_registry_lock);
 }
+__attribute__((alias(urcu_stringify(rcu_unregister_thread))))
+void alias_rcu_unregister_thread();
 
 #ifdef RCU_MEMBARRIER
 
@@ -559,7 +585,7 @@ void rcu_sys_membarrier_status(bool available)
 {
        if (!available)
                return;
-       rcu_has_sys_membarrier_memb = 1;
+       urcu_memb_has_sys_membarrier = 1;
 }
 #endif
 
@@ -574,7 +600,7 @@ void rcu_sys_membarrier_init(void)
                if (mask & MEMBARRIER_CMD_PRIVATE_EXPEDITED) {
                        if (membarrier(MEMBARRIER_CMD_REGISTER_PRIVATE_EXPEDITED, 0))
                                urcu_die(errno);
-                       has_sys_membarrier_private_expedited = 1;
+                       urcu_memb_has_sys_membarrier_private_expedited = 1;
                        available = true;
                } else if (mask & MEMBARRIER_CMD_SHARED) {
                        available = true;
@@ -590,6 +616,8 @@ void rcu_init(void)
        init_done = 1;
        rcu_sys_membarrier_init();
 }
+__attribute__((alias(urcu_stringify(rcu_init))))
+void alias_rcu_init(void);
 #endif
 
 #ifdef RCU_SIGNAL
@@ -629,6 +657,8 @@ void rcu_init(void)
        if (ret)
                urcu_die(errno);
 }
+__attribute__((alias(urcu_stringify(rcu_init))))
+void alias_rcu_init(void);
 
 void rcu_exit(void)
 {
@@ -641,10 +671,13 @@ void rcu_exit(void)
         * assert(cds_list_empty(&registry));
         */
 }
+__attribute__((alias(urcu_stringify(rcu_exit))))
+void alias_rcu_exit(void);
 
 #endif /* #ifdef RCU_SIGNAL */
 
 DEFINE_RCU_FLAVOR(rcu_flavor);
+DEFINE_RCU_FLAVOR_ALIAS(rcu_flavor, alias_rcu_flavor);
 
 #include "urcu-call-rcu-impl.h"
 #include "urcu-defer-impl.h"