From 1c32826aa2d1216f518f661d1728e11d8957131c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E6=9C=A8=E5=A4=B4=E4=BA=91?= <mark.lonr@tom.com>
Date: Thu, 28 Mar 2019 17:08:32 +0800
Subject: [PATCH] Update shm.cpp

---
 src/shm.cpp | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/shm.cpp b/src/shm.cpp
index 2b3f8c2..a34c9cf 100644
--- a/src/shm.cpp
+++ b/src/shm.cpp
@@ -65,6 +65,7 @@ bool handle::acquire(char const * name, std::size_t size, unsigned mode) {
 }
 
 void handle::release() {
+    if (impl(p_)->id_ == nullptr) return;
     shm::release(detach());
 }