* IBM's contributions to this file may be relicensed under LGPLv2 or later.
*/
+#define URCU_NO_COMPAT_IDENTIFIERS
#define _LGPL_SOURCE
#include <stdio.h>
#include <pthread.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 */
*/
static pthread_mutex_t rcu_registry_lock = PTHREAD_MUTEX_INITIALIZER;
struct urcu_gp urcu_qsbr_gp = { .ctr = URCU_QSBR_GP_ONLINE };
-__attribute__((alias("urcu_qsbr_gp"))) extern struct urcu_gp rcu_gp_qsbr;
+URCU_ATTR_ALIAS("urcu_qsbr_gp") extern struct urcu_gp rcu_gp_qsbr;
/*
* Active attempts to check for reader Q.S. before calling futex().
* writers.
*/
DEFINE_URCU_TLS(struct urcu_qsbr_reader, urcu_qsbr_reader);
-__attribute__((alias("urcu_qsbr_reader")))
-extern struct urcu_qsbr_reader rcu_reader_qsbr;
+DEFINE_URCU_TLS_ALIAS(struct urcu_qsbr_reader, urcu_qsbr_reader, rcu_reader_qsbr);
static CDS_LIST_HEAD(registry);
{
/* Read reader_gp before read futex */
cmm_smp_rmb();
- if (uatomic_read(&urcu_qsbr_gp.futex) != -1)
- return;
- while (futex_noasync(&urcu_qsbr_gp.futex, FUTEX_WAIT, -1,
- NULL, NULL, 0)) {
+ while (uatomic_read(&urcu_qsbr_gp.futex) == -1) {
+ if (!futex_noasync(&urcu_qsbr_gp.futex, FUTEX_WAIT, -1, NULL, NULL, 0)) {
+ /*
+ * Prior queued wakeups queued by unrelated code
+ * using the same address can cause futex wait to
+ * return 0 even through the futex value is still
+ * -1 (spurious wakeups). Check the value again
+ * in user-space to validate whether it really
+ * differs from -1.
+ */
+ continue;
+ }
switch (errno) {
- case EWOULDBLOCK:
+ case EAGAIN:
/* Value already changed. */
return;
case EINTR:
/* Retry if interrupted by signal. */
- break; /* Get out of switch. */
+ break; /* Get out of switch. Check again. */
default:
/* Unexpected error. */
urcu_die(errno);
cmm_smp_mb();
}
#endif /* !(CAA_BITS_PER_LONG < 64) */
-__attribute__((alias("urcu_qsbr_synchronize_rcu")))
+URCU_ATTR_ALIAS("urcu_qsbr_synchronize_rcu")
void synchronize_rcu_qsbr();
/*
{
_urcu_qsbr_read_lock();
}
-__attribute__((alias("urcu_qsbr_read_lock"))) void rcu_read_lock_qsbr();
+URCU_ATTR_ALIAS("urcu_qsbr_read_lock") void rcu_read_lock_qsbr();
void urcu_qsbr_read_unlock(void)
{
_urcu_qsbr_read_unlock();
}
-__attribute__((alias("urcu_qsbr_read_unlock"))) void rcu_read_unlock_qsbr();
+URCU_ATTR_ALIAS("urcu_qsbr_read_unlock") void rcu_read_unlock_qsbr();
int urcu_qsbr_read_ongoing(void)
{
return _urcu_qsbr_read_ongoing();
}
-__attribute__((alias("urcu_qsbr_read_ongoing")))
+URCU_ATTR_ALIAS("urcu_qsbr_read_ongoing")
void rcu_read_ongoing_qsbr();
void urcu_qsbr_quiescent_state(void)
{
_urcu_qsbr_quiescent_state();
}
-__attribute__((alias("urcu_qsbr_quiescent_state")))
+URCU_ATTR_ALIAS("urcu_qsbr_quiescent_state")
void rcu_quiescent_state_qsbr();
void urcu_qsbr_thread_offline(void)
{
_urcu_qsbr_thread_offline();
}
-__attribute__((alias("urcu_qsbr_thread_offline")))
+URCU_ATTR_ALIAS("urcu_qsbr_thread_offline")
void rcu_thread_offline_qsbr();
void urcu_qsbr_thread_online(void)
{
_urcu_qsbr_thread_online();
}
-__attribute__((alias("urcu_qsbr_thread_online")))
+URCU_ATTR_ALIAS("urcu_qsbr_thread_online")
void rcu_thread_online_qsbr();
void urcu_qsbr_register_thread(void)
mutex_unlock(&rcu_registry_lock);
_urcu_qsbr_thread_online();
}
-__attribute__((alias("urcu_qsbr_register_thread")))
+URCU_ATTR_ALIAS("urcu_qsbr_register_thread")
void rcu_register_thread_qsbr();
void urcu_qsbr_unregister_thread(void)
cds_list_del(&URCU_TLS(urcu_qsbr_reader).node);
mutex_unlock(&rcu_registry_lock);
}
-__attribute__((alias("urcu_qsbr_unregister_thread")))
+URCU_ATTR_ALIAS("urcu_qsbr_unregister_thread")
void rcu_unregister_thread_qsbr();
void urcu_qsbr_exit(void)
* assert(cds_list_empty(®istry));
*/
}
-__attribute__((alias("urcu_qsbr_exit"))) void rcu_exit_qsbr();
+URCU_ATTR_ALIAS("urcu_qsbr_exit") void rcu_exit_qsbr();
DEFINE_RCU_FLAVOR(rcu_flavor);
DEFINE_RCU_FLAVOR_ALIAS(rcu_flavor, alias_rcu_flavor);