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[OpenMP] Improve performance of ticket lock (x86) #143557

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Merged
merged 2 commits into from
Jul 21, 2025
Merged

[OpenMP] Improve performance of ticket lock (x86) #143557

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f8c9131
[OpenMP] Improve performance of ticket lock (x86)
jpeyton52 Jun 10, 2025
403c58f
Remove the distance variable as suggested by Hansang
jpeyton52 Jun 10, 2025
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7 changes: 0 additions & 7 deletions openmp/runtime/src/kmp_lock.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -712,16 +712,9 @@ static int __kmp_test_ticket_lock_with_checks(kmp_ticket_lock_t *lck,
}

int __kmp_release_ticket_lock(kmp_ticket_lock_t *lck, kmp_int32 gtid) {
kmp_uint32 distance = std::atomic_load_explicit(&lck->lk.next_ticket,
std::memory_order_relaxed) -
std::atomic_load_explicit(&lck->lk.now_serving,
std::memory_order_relaxed);

std::atomic_fetch_add_explicit(&lck->lk.now_serving, 1U,
std::memory_order_release);

KMP_YIELD(distance >
(kmp_uint32)(__kmp_avail_proc ? __kmp_avail_proc : __kmp_xproc));
return KMP_LOCK_RELEASED;
}

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