X-Git-Url: http://git.liburcu.org/?p=urcu.git;a=blobdiff_plain;f=src%2Furcu.c;h=c4e2dde9ab798986111ff070741b18c9e2cd237f;hp=ccd9706dda6fe6a8b6bfcba2fced7893054cf3ae;hb=ce28e67a534dcf0b68ccad2218e5a2e552e6e469;hpb=6893800a4d1cc14dff0395ddcd660a5138db183d

diff --git a/src/urcu.c b/src/urcu.c
index ccd9706..c4e2dde 100644
--- a/src/urcu.c
+++ b/src/urcu.c
@@ -34,21 +34,24 @@
 #include <stdint.h>
 #include <string.h>
 #include <errno.h>
+#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
 
 /*
@@ -71,13 +74,27 @@
 #endif
 
 enum membarrier_cmd {
-	MEMBARRIER_CMD_QUERY = 0,
-	MEMBARRIER_CMD_SHARED = (1 << 0),
+	MEMBARRIER_CMD_QUERY				= 0,
+	MEMBARRIER_CMD_SHARED				= (1 << 0),
+	/* reserved for MEMBARRIER_CMD_SHARED_EXPEDITED (1 << 1) */
+	/* reserved for MEMBARRIER_CMD_PRIVATE (1 << 2) */
+	MEMBARRIER_CMD_PRIVATE_EXPEDITED		= (1 << 3),
+	MEMBARRIER_CMD_REGISTER_PRIVATE_EXPEDITED	= (1 << 4),
 };
 
 #ifdef RCU_MEMBARRIER
 static int init_done;
-int rcu_has_sys_membarrier;
+static int urcu_memb_has_sys_membarrier_private_expedited;
+
+#ifndef CONFIG_RCU_FORCE_SYS_MEMBARRIER
+/*
+ * Explicitly initialize to zero because we can't alias a non-static
+ * uninitialized variable.
+ */
+int urcu_memb_has_sys_membarrier = 0;
+URCU_ATTR_ALIAS("urcu_memb_has_sys_membarrier")
+extern int rcu_has_sys_membarrier_memb;
+#endif
 
 void __attribute__((constructor)) rcu_init(void);
 #endif
@@ -86,6 +103,8 @@ void __attribute__((constructor)) rcu_init(void);
 void rcu_init(void)
 {
 }
+URCU_ATTR_ALIAS(urcu_stringify(rcu_init))
+void alias_rcu_init(void);
 #endif
 
 #ifdef RCU_SIGNAL
@@ -110,13 +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 };
+URCU_ATTR_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);
+URCU_ATTR_ALIAS(urcu_stringify(rcu_reader))
+extern struct urcu_reader alias_rcu_reader;
 
 static CDS_LIST_HEAD(registry);
 
@@ -160,10 +183,14 @@ static void mutex_unlock(pthread_mutex_t *mutex)
 #ifdef RCU_MEMBARRIER
 static void smp_mb_master(void)
 {
-	if (caa_likely(rcu_has_sys_membarrier))
-		(void) membarrier(MEMBARRIER_CMD_SHARED, 0);
-	else
+	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);
+	} else {
 		cmm_smp_mb();
+	}
 }
 #endif
 
@@ -177,7 +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
@@ -270,7 +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 */
@@ -290,18 +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
@@ -441,7 +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
@@ -488,6 +515,8 @@ out:
 	 */
 	urcu_wake_all_waiters(&waiters);
 }
+URCU_ATTR_ALIAS(urcu_stringify(synchronize_rcu))
+void alias_synchronize_rcu();
 
 /*
  * library wrappers to be used by non-LGPL compatible source code.
@@ -497,22 +526,28 @@ void rcu_read_lock(void)
 {
 	_rcu_read_lock();
 }
+URCU_ATTR_ALIAS(urcu_stringify(rcu_read_lock))
+void alias_rcu_read_lock();
 
 void rcu_read_unlock(void)
 {
 	_rcu_read_unlock();
 }
+URCU_ATTR_ALIAS(urcu_stringify(rcu_read_unlock))
+void alias_rcu_read_unlock();
 
 int rcu_read_ongoing(void)
 {
 	return _rcu_read_ongoing();
 }
+URCU_ATTR_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);
@@ -521,6 +556,8 @@ void rcu_register_thread(void)
 	cds_list_add(&URCU_TLS(rcu_reader).node, &registry);
 	mutex_unlock(&rcu_registry_lock);
 }
+URCU_ATTR_ALIAS(urcu_stringify(rcu_register_thread))
+void alias_rcu_register_thread();
 
 void rcu_unregister_thread(void)
 {
@@ -530,20 +567,57 @@ void rcu_unregister_thread(void)
 	cds_list_del(&URCU_TLS(rcu_reader).node);
 	mutex_unlock(&rcu_registry_lock);
 }
+URCU_ATTR_ALIAS(urcu_stringify(rcu_unregister_thread))
+void alias_rcu_unregister_thread();
 
 #ifdef RCU_MEMBARRIER
-void rcu_init(void)
+
+#ifdef CONFIG_RCU_FORCE_SYS_MEMBARRIER
+static
+void rcu_sys_membarrier_status(bool available)
 {
-	int ret;
+	if (!available)
+		abort();
+}
+#else
+static
+void rcu_sys_membarrier_status(bool available)
+{
+	if (!available)
+		return;
+	urcu_memb_has_sys_membarrier = 1;
+}
+#endif
 
+static
+void rcu_sys_membarrier_init(void)
+{
+	bool available = false;
+	int mask;
+
+	mask = membarrier(MEMBARRIER_CMD_QUERY, 0);
+	if (mask >= 0) {
+		if (mask & MEMBARRIER_CMD_PRIVATE_EXPEDITED) {
+			if (membarrier(MEMBARRIER_CMD_REGISTER_PRIVATE_EXPEDITED, 0))
+				urcu_die(errno);
+			urcu_memb_has_sys_membarrier_private_expedited = 1;
+			available = true;
+		} else if (mask & MEMBARRIER_CMD_SHARED) {
+			available = true;
+		}
+	}
+	rcu_sys_membarrier_status(available);
+}
+
+void rcu_init(void)
+{
 	if (init_done)
 		return;
 	init_done = 1;
-	ret = membarrier(MEMBARRIER_CMD_QUERY, 0);
-	if (ret >= 0 && (ret & MEMBARRIER_CMD_SHARED)) {
-		rcu_has_sys_membarrier = 1;
-	}
+	rcu_sys_membarrier_init();
 }
+URCU_ATTR_ALIAS(urcu_stringify(rcu_init))
+void alias_rcu_init(void);
 #endif
 
 #ifdef RCU_SIGNAL
@@ -583,6 +657,8 @@ void rcu_init(void)
 	if (ret)
 		urcu_die(errno);
 }
+URCU_ATTR_ALIAS(urcu_stringify(rcu_init))
+void alias_rcu_init(void);
 
 void rcu_exit(void)
 {
@@ -595,10 +671,13 @@ void rcu_exit(void)
 	 * assert(cds_list_empty(&registry));
 	 */
 }
+URCU_ATTR_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"