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Make recursive mutexes slightly faster

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Justine Tunney 2024-12-30 01:37:14 -08:00
parent 9ba5b227d9
commit c7e3d9f7ff
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GPG key ID: BE714B4575D6E328
6 changed files with 12 additions and 8 deletions
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5
libc/intrin/pthread_mutex_unlock.c
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@ -30,6 +30,7 @@
#include "libc/thread/lock.h"
#include "libc/thread/posixthread.internal.h"
#include "libc/thread/thread.h"
#include "libc/thread/tls.h"
#include "third_party/nsync/mu.h"
// see "take 3" algorithm in "futexes are tricky" by ulrich drepper
@ -43,7 +44,7 @@ static void pthread_mutex_unlock_drepper(atomic_int *futex, char pshare) {
static errno_t pthread_mutex_unlock_recursive(pthread_mutex_t *mutex,
uint64_t word) {
int me = gettid();
int me = atomic_load_explicit(&__get_tls()->tib_tid, memory_order_relaxed);
for (;;) {
// we allow unlocking an initialized lock that wasn't locked, but we
@ -75,7 +76,7 @@ static errno_t pthread_mutex_unlock_recursive(pthread_mutex_t *mutex,
#if PTHREAD_USE_NSYNC
static errno_t pthread_mutex_unlock_recursive_nsync(pthread_mutex_t *mutex,
uint64_t word) {
int me = gettid();
int me = atomic_load_explicit(&__get_tls()->tib_tid, memory_order_relaxed);
for (;;) {
// we allow unlocking an initialized lock that wasn't locked, but we