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Core: simplify reader lock release.

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This commit is contained in:
Pavel Pautov 2022-01-19 17:37:34 -08:00
parent 429150c1fa
commit 950390108c
1 changed files with 3 additions and 15 deletions
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18
src/core/ngx_rwlock.c
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@ -89,22 +89,10 @@ ngx_rwlock_rlock(ngx_atomic_t *lock)
void
ngx_rwlock_unlock(ngx_atomic_t *lock)
{
ngx_atomic_uint_t readers;
readers = *lock;
if (readers == NGX_RWLOCK_WLOCK) {
if (*lock == NGX_RWLOCK_WLOCK) {
(void) ngx_atomic_cmp_set(lock, NGX_RWLOCK_WLOCK, 0);
return;
}
for ( ;; ) {
if (ngx_atomic_cmp_set(lock, readers, readers - 1)) {
return;
}
readers = *lock;
} else {
(void) ngx_atomic_fetch_add(lock, -1);
}
}