commit 53899e6c33c1198cd2520cc0cad8c284f3af2f4b
author Pavel Pautov <p.pautov@f5.com> Wed Jan 19 17:37:34 2022 -0800
committer Pavel Pautov <p.pautov@f5.com> Wed Jan 19 17:37:34 2022 -0800
tree 4575dbb897d11ab184d8dbf1458cb6c3f0f6fb47
parent d550bc0eebc55079157fe2574bfdb0104d29225d

Core: simplify reader lock release.

src/core/ngx_rwlock.c

diff --git a/src/core/ngx_rwlock.c b/src/core/ngx_rwlock.c
index ed2b0f8..e7da8a8 100644
--- a/src/core/ngx_rwlock.c
+++ b/src/core/ngx_rwlock.c
@@ -89,22 +89,10 @@
 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);
     }
 }