Merge branch 'PHP-7.2' into PHP-7.3

* PHP-7.2:
  Prevent race condition in opcache_reset()

Author: dstogov

ext/opcache/zend_accelerator_module.c

@@ -766,7 +766,10 @@ static ZEND_FUNCTION(opcache_reset)
 		RETURN_FALSE;
 	}
 
+	/* exclusive lock */
+	zend_shared_alloc_lock();
 	zend_accel_schedule_restart(ACCEL_RESTART_USER);
+	zend_shared_alloc_unlock();
 	RETURN_TRUE;
 }