* IBM's contributions to this file may be relicensed under LGPLv2 or later.
*/
+#define URCU_NO_COMPAT_IDENTIFIERS
#define _BSD_SOURCE
#define _LGPL_SOURCE
#define _DEFAULT_SOURCE
#include <stdbool.h>
#include <poll.h>
+#include <urcu/config.h>
#include <urcu/arch.h>
#include <urcu/wfcqueue.h>
#include <urcu/map/urcu.h>
* uninitialized variable.
*/
int urcu_memb_has_sys_membarrier = 0;
-__attribute__((alias("urcu_memb_has_sys_membarrier")))
+URCU_ATTR_ALIAS("urcu_memb_has_sys_membarrier")
extern int rcu_has_sys_membarrier_memb;
#endif
void rcu_init(void)
{
}
-__attribute__((alias(urcu_stringify(rcu_init))))
+URCU_ATTR_ALIAS(urcu_stringify(rcu_init))
void alias_rcu_init(void);
#endif
*/
static pthread_mutex_t rcu_registry_lock = PTHREAD_MUTEX_INITIALIZER;
struct urcu_gp rcu_gp = { .ctr = URCU_GP_COUNT };
-__attribute__((alias(urcu_stringify(rcu_gp))))
+URCU_ATTR_ALIAS(urcu_stringify(rcu_gp))
extern struct urcu_gp alias_rcu_gp;
/*
* writers.
*/
DEFINE_URCU_TLS(struct urcu_reader, rcu_reader);
-__attribute__((alias(urcu_stringify(rcu_reader))))
-extern struct urcu_reader alias_rcu_reader;
+DEFINE_URCU_TLS_ALIAS(struct urcu_reader, rcu_reader, alias_rcu_reader);
static CDS_LIST_HEAD(registry);
smp_mb_master();
/* Temporarily unlock the registry lock. */
mutex_unlock(&rcu_registry_lock);
- if (uatomic_read(&rcu_gp.futex) != -1)
- goto end;
- while (futex_async(&rcu_gp.futex, FUTEX_WAIT, -1,
- NULL, NULL, 0)) {
+ while (uatomic_read(&rcu_gp.futex) == -1) {
+ if (!futex_async(&rcu_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. */
goto end;
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);
*/
urcu_wake_all_waiters(&waiters);
}
-__attribute__((alias(urcu_stringify(synchronize_rcu))))
+URCU_ATTR_ALIAS(urcu_stringify(synchronize_rcu))
void alias_synchronize_rcu();
/*
{
_rcu_read_lock();
}
-__attribute__((alias(urcu_stringify(rcu_read_lock))))
+URCU_ATTR_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))))
+URCU_ATTR_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))))
+URCU_ATTR_ALIAS(urcu_stringify(rcu_read_ongoing))
void alias_rcu_read_ongoing();
void rcu_register_thread(void)
cds_list_add(&URCU_TLS(rcu_reader).node, ®istry);
mutex_unlock(&rcu_registry_lock);
}
-__attribute__((alias(urcu_stringify(rcu_register_thread))))
+URCU_ATTR_ALIAS(urcu_stringify(rcu_register_thread))
void alias_rcu_register_thread();
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))))
+URCU_ATTR_ALIAS(urcu_stringify(rcu_unregister_thread))
void alias_rcu_unregister_thread();
#ifdef RCU_MEMBARRIER
init_done = 1;
rcu_sys_membarrier_init();
}
-__attribute__((alias(urcu_stringify(rcu_init))))
+URCU_ATTR_ALIAS(urcu_stringify(rcu_init))
void alias_rcu_init(void);
#endif
#ifdef RCU_SIGNAL
-static void sigrcu_handler(int signo, siginfo_t *siginfo, void *context)
+static void sigrcu_handler(int signo __attribute__((unused)),
+ siginfo_t *siginfo __attribute__((unused)),
+ void *context __attribute__((unused)))
{
/*
* Executing this cmm_smp_mb() is the only purpose of this signal handler.
if (ret)
urcu_die(errno);
}
-__attribute__((alias(urcu_stringify(rcu_init))))
+URCU_ATTR_ALIAS(urcu_stringify(rcu_init))
void alias_rcu_init(void);
void rcu_exit(void)
* assert(cds_list_empty(®istry));
*/
}
-__attribute__((alias(urcu_stringify(rcu_exit))))
+URCU_ATTR_ALIAS(urcu_stringify(rcu_exit))
void alias_rcu_exit(void);
#endif /* #ifdef RCU_SIGNAL */