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Make spinlocks faster (take two)

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This change is green on x86 and arm test fleet.
This commit is contained in:
Justine Tunney 2024-07-26 00:44:45 -07:00
parent 02e1cbcd00
commit 59692b0882
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GPG key ID: BE714B4575D6E328
14 changed files with 122 additions and 79 deletions
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8
libc/intrin/pthread_spin_lock.c
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@ -38,8 +38,12 @@
* @see pthread_spin_init
*/
errno_t pthread_spin_lock(pthread_spinlock_t *spin) {
while (atomic_exchange_explicit(&spin->_lock, 1, memory_order_acquire)) {
pthread_pause_np();
for (;;) {
if (!atomic_exchange_explicit(&spin->_lock, 1, memory_order_acquire))
break;
for (;;)
if (!atomic_load_explicit(&spin->_lock, memory_order_relaxed))
break;
}
return 0;
}