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From 70230bf894d9c0150dca8dc6fccc2712187f7b86 Mon Sep 17 00:00:00 2001
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From: William Brown <firstyear@redhat.com>
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Date: Mon, 13 Mar 2017 13:29:43 +1000
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Subject: [PATCH 1/5] Ticket 49164 - Change NS to acq-rel semantics for atomics
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Bug Description: We were using seq_cst to guarantee our operations
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as a poc. Changing to acq/rel allows us the same guarantees, but
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with less overheads.
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Fix Description: Change the barrier type.
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https://gcc.gnu.org/wiki/Atomic/GCCMM/AtomicSync
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https://pagure.io/389-ds-base/issue/49164
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Author: wibrown
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Review by: mreynolds (Thanks!)
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(cherry picked from commit b1b0574d2cdb012ab206999ed51f08d3340386ce)
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---
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src/nunc-stans/ns/ns_thrpool.c | 8 ++++----
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1 file changed, 4 insertions(+), 4 deletions(-)
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diff --git a/src/nunc-stans/ns/ns_thrpool.c b/src/nunc-stans/ns/ns_thrpool.c
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index 744749b..a867b39 100644
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--- a/src/nunc-stans/ns/ns_thrpool.c
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+++ b/src/nunc-stans/ns/ns_thrpool.c
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@@ -167,7 +167,7 @@ ns_thrpool_is_shutdown(struct ns_thrpool_t *tp)
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{
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/* We need to barrier this somehow? */
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int32_t result = 0;
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- __atomic_load(&(tp->shutdown), &result, __ATOMIC_SEQ_CST);
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+ __atomic_load(&(tp->shutdown), &result, __ATOMIC_ACQUIRE);
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return result;
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}
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@@ -176,7 +176,7 @@ ns_thrpool_is_event_shutdown(struct ns_thrpool_t *tp)
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{
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/* We need to barrier this somehow? */
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int32_t result = 0;
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- __atomic_load(&(tp->shutdown_event_loop), &result, __ATOMIC_SEQ_CST);
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+ __atomic_load(&(tp->shutdown_event_loop), &result, __ATOMIC_ACQUIRE);
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return result;
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}
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@@ -1402,7 +1402,7 @@ ns_thrpool_destroy(struct ns_thrpool_t *tp)
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#endif
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if (tp) {
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/* Set the flag to shutdown the event loop. */
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- __atomic_add_fetch(&(tp->shutdown_event_loop), 1, __ATOMIC_SEQ_CST);
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+ __atomic_add_fetch(&(tp->shutdown_event_loop), 1, __ATOMIC_RELEASE);
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/* Finish the event queue wakeup job. This has the
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* side effect of waking up the event loop thread, which
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@@ -1491,7 +1491,7 @@ ns_thrpool_shutdown(struct ns_thrpool_t *tp)
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}
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/* Set the shutdown flag. This will cause the worker
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* threads to exit after they finish all remaining work. */
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- __atomic_add_fetch(&(tp->shutdown), 1, __ATOMIC_SEQ_CST);
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+ __atomic_add_fetch(&(tp->shutdown), 1, __ATOMIC_RELEASE);
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/* Wake up the idle worker threads so they can exit. */
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pthread_mutex_lock(&(tp->work_q_lock));
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--
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2.9.3
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