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Move assignment out of the CAS condition
Update commit49302b8fdf
Author: H.J. Lu <hjl.tools@gmail.com> Date: Thu Nov 11 06:54:01 2021 -0800 Avoid extra load with CAS in __pthread_mutex_clocklock_common [BZ #28537] Replace boolean CAS with value CAS to avoid the extra load. and commit0b82747dc4
Author: H.J. Lu <hjl.tools@gmail.com> Date: Thu Nov 11 06:31:51 2021 -0800 Avoid extra load with CAS in __pthread_mutex_lock_full [BZ #28537] Replace boolean CAS with value CAS to avoid the extra load. by moving assignment out of the CAS condition. (cherry picked from commit120ac6d238
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@ -305,10 +305,9 @@ __pthread_mutex_lock_full (pthread_mutex_t *mutex)
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meantime. */
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if ((oldval & FUTEX_WAITERS) == 0)
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{
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int val;
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if ((val = atomic_compare_and_exchange_val_acq
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(&mutex->__data.__lock, oldval | FUTEX_WAITERS,
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oldval)) != oldval)
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int val = atomic_compare_and_exchange_val_acq
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(&mutex->__data.__lock, oldval | FUTEX_WAITERS, oldval);
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if (val != oldval)
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{
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oldval = val;
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continue;
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@ -234,10 +234,9 @@ __pthread_mutex_clocklock_common (pthread_mutex_t *mutex,
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meantime. */
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if ((oldval & FUTEX_WAITERS) == 0)
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{
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int val;
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if ((val = atomic_compare_and_exchange_val_acq
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(&mutex->__data.__lock, oldval | FUTEX_WAITERS,
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oldval)) != oldval)
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int val = atomic_compare_and_exchange_val_acq
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(&mutex->__data.__lock, oldval | FUTEX_WAITERS, oldval);
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if (val != oldval)
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{
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oldval = val;
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continue;
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