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comparison src/core/ngx_rwlock.c @ 7995:7752d8523066

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Core: simplify reader lock release.
author Pavel Pautov <p.pautov@f5.com>
date Wed, 19 Jan 2022 17:37:34 -0800
parents d1816a2696de
children
comparison
equal deleted inserted replaced
7994:aeab41dfd260 7995:7752d8523066
87 87
88 88
89 void 89 void
90 ngx_rwlock_unlock(ngx_atomic_t *lock) 90 ngx_rwlock_unlock(ngx_atomic_t *lock)
91 { 91 {
92 ngx_atomic_uint_t readers; 92 if (*lock == NGX_RWLOCK_WLOCK) {
93
94 readers = *lock;
95
96 if (readers == NGX_RWLOCK_WLOCK) {
97 (void) ngx_atomic_cmp_set(lock, NGX_RWLOCK_WLOCK, 0); 93 (void) ngx_atomic_cmp_set(lock, NGX_RWLOCK_WLOCK, 0);
98 return; 94 } else {
99 } 95 (void) ngx_atomic_fetch_add(lock, -1);
100
101 for ( ;; ) {
102
103 if (ngx_atomic_cmp_set(lock, readers, readers - 1)) {
104 return;
105 }
106
107 readers = *lock;
108 } 96 }
109 } 97 }
110 98
111 99
112 void 100 void