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changeset 7038:d1816a2696de

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Introduced ngx_rwlock_downgrade().
author Ruslan Ermilov <ru@nginx.com>
date Fri, 16 Jun 2017 18:15:58 +0300
parents 12efcdcb8a4b
children a39bc74873fa
files src/core/ngx_rwlock.c src/core/ngx_rwlock.h
diffstat 2 files changed, 10 insertions(+), 0 deletions(-) [+]
line wrap: on
line diff
--- a/src/core/ngx_rwlock.c
+++ b/src/core/ngx_rwlock.c
@@ -109,6 +109,15 @@ ngx_rwlock_unlock(ngx_atomic_t *lock)
 }
 
 
+void
+ngx_rwlock_downgrade(ngx_atomic_t *lock)
+{
+    if (*lock == NGX_RWLOCK_WLOCK) {
+        *lock = 1;
+    }
+}
+
+
 #else
 
 #if (NGX_HTTP_UPSTREAM_ZONE || NGX_STREAM_UPSTREAM_ZONE)
--- a/src/core/ngx_rwlock.h
+++ b/src/core/ngx_rwlock.h
@@ -16,6 +16,7 @@
 void ngx_rwlock_wlock(ngx_atomic_t *lock);
 void ngx_rwlock_rlock(ngx_atomic_t *lock);
 void ngx_rwlock_unlock(ngx_atomic_t *lock);
+void ngx_rwlock_downgrade(ngx_atomic_t *lock);
 
 
 #endif /* _NGX_RWLOCK_H_INCLUDED_ */