From 13944b37c971df72c79f6b1d08e8ad835399f047 Mon Sep 17 00:00:00 2001
From: mgronlun <unknown>
Date: Wed, 13 Feb 2013 11:23:46 +0100
Subject: [PATCH] 8007312: null check signal semaphore in os::signal_notify
 windows Reviewed-by: dholmes, sla

---
 src/os/windows/vm/os_windows.cpp | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/src/os/windows/vm/os_windows.cpp b/src/os/windows/vm/os_windows.cpp
index eb16478ab..b1556bf64 100644
--- a/src/os/windows/vm/os_windows.cpp
+++ b/src/os/windows/vm/os_windows.cpp
@@ -1940,7 +1940,7 @@ int os::sigexitnum_pd(){
 
 // a counter for each possible signal value, including signal_thread exit signal
 static volatile jint pending_signals[NSIG+1] = { 0 };
-static HANDLE sig_sem;
+static HANDLE sig_sem = NULL;
 
 void os::signal_init_pd() {
   // Initialize signal structures
@@ -1970,10 +1970,11 @@ void os::signal_init_pd() {
 
 void os::signal_notify(int signal_number) {
   BOOL ret;
-
-  Atomic::inc(&pending_signals[signal_number]);
-  ret = ::ReleaseSemaphore(sig_sem, 1, NULL);
-  assert(ret != 0, "ReleaseSemaphore() failed");
+  if (sig_sem != NULL) {
+    Atomic::inc(&pending_signals[signal_number]);
+    ret = ::ReleaseSemaphore(sig_sem, 1, NULL);
+    assert(ret != 0, "ReleaseSemaphore() failed");
+  }
 }
 
 static int check_pending_signals(bool wait_for_signal) {
-- 
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