#endif
static pthread_mutex_t rcu_gp_lock = PTHREAD_MUTEX_INITIALIZER;
-
-int32_t rcu_gp_futex;
-
-/*
- * Global grace period counter.
- * Contains the current RCU_GP_CTR_PHASE.
- * Also has a RCU_GP_COUNT of 1, to accelerate the reader fast path.
- * Written to only by writer with mutex taken. Read by both writer and readers.
- */
-unsigned long rcu_gp_ctr = RCU_GP_COUNT;
+struct urcu_gp rcu_gp = { .ctr = RCU_GP_COUNT };
/*
* Written to only by each individual reader. Read by both the reader and the
{
/* Read reader_gp before read futex */
smp_mb_master(RCU_MB_GROUP);
- if (uatomic_read(&rcu_gp_futex) == -1)
- futex_async(&rcu_gp_futex, FUTEX_WAIT, -1,
+ if (uatomic_read(&rcu_gp.futex) == -1)
+ futex_async(&rcu_gp.futex, FUTEX_WAIT, -1,
NULL, NULL, 0);
}
/*
* Wait for each thread URCU_TLS(rcu_reader).ctr to either
* indicate quiescence (not nested), or observe the current
- * rcu_gp_ctr value.
+ * rcu_gp.ctr value.
*/
for (;;) {
wait_loops++;
if (wait_loops == RCU_QS_ACTIVE_ATTEMPTS) {
- uatomic_dec(&rcu_gp_futex);
+ uatomic_dec(&rcu_gp.futex);
/* Write futex before read reader_gp */
smp_mb_master(RCU_MB_GROUP);
}
if (wait_loops == RCU_QS_ACTIVE_ATTEMPTS) {
/* Read reader_gp before write futex */
smp_mb_master(RCU_MB_GROUP);
- uatomic_set(&rcu_gp_futex, 0);
+ uatomic_set(&rcu_gp.futex, 0);
}
break;
} else {
if (wait_loops == RCU_QS_ACTIVE_ATTEMPTS) {
/* Read reader_gp before write futex */
smp_mb_master(RCU_MB_GROUP);
- uatomic_set(&rcu_gp_futex, 0);
+ uatomic_set(&rcu_gp.futex, 0);
}
break;
} else {
/*
* Must finish waiting for quiescent state for original parity before
- * committing next rcu_gp_ctr update to memory. Failure to do so could
+ * committing next rcu_gp.ctr update to memory. Failure to do so could
* result in the writer waiting forever while new readers are always
* accessing data (no progress). Enforce compiler-order of load
- * URCU_TLS(rcu_reader).ctr before store to rcu_gp_ctr.
+ * URCU_TLS(rcu_reader).ctr before store to rcu_gp.ctr.
*/
cmm_barrier();
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 ^ RCU_GP_CTR_PHASE);
/*
- * Must commit rcu_gp_ctr update to memory before waiting for quiescent
+ * Must commit rcu_gp.ctr update to memory before waiting for quiescent
* state. Failure to do so could result in the writer waiting forever
* while new readers are always accessing data (no progress). Enforce
- * compiler-order of store to rcu_gp_ctr before load rcu_reader ctr.
+ * compiler-order of store to rcu_gp.ctr before load rcu_reader ctr.
*/
cmm_barrier();