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diff src/core/ngx_atomic.h @ 370:54f76b0b8dca

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nginx-0.0.7-2004-06-27-22:01:57 import
author Igor Sysoev <igor@sysoev.ru>
date Sun, 27 Jun 2004 18:01:57 +0000
parents 1526e7686b20
children 780e93985b93
line wrap: on
line diff
--- a/src/core/ngx_atomic.h
+++ b/src/core/ngx_atomic.h
@@ -93,4 +93,18 @@ typedef volatile uint32_t  ngx_atomic_t;
 #endif
 
 
+static ngx_inline ngx_int_t ngx_trylock(ngx_atomic_t *lock)
+{
+    if (*lock) {
+        return NGX_BUSY;
+    }
+
+    if (ngx_atomic_cmp_set(lock, 0, 1)) {
+        return NGX_OK;
+    }
+
+    return NGX_BUSY;
+}
+
+
 #endif /* _NGX_ATOMIC_H_INCLUDED_ */