Introduced ngx_rwlock_downgrade().

diff --git a/src/core/ngx_rwlock.c b/src/core/ngx_rwlock.c
index 0aed29af5f0de118593b3b6b4fd84955077b1899..ed2b0f81050d325f8ee08d3053d0e2bb528c04af 100644 (file)
--- 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)

diff --git a/src/core/ngx_rwlock.h b/src/core/ngx_rwlock.h
index 8b16eca20f51a0fcfc20bee7f734007b26a921c6..41b42aa82d670a135e19241d15e8c81b9ec25190 100644 (file)
--- 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_ */