From 06831f3ce25bb5b9778c4de1ad35dd50ed6b7b32 Mon Sep 17 00:00:00 2001
From: "jan.nijtmans" <nijtmans@users.sourceforge.net>
Date: Mon, 21 Mar 2016 12:08:34 +0000
Subject: (cherry-pick): Fix [d3071887dbc7aeac]: Fix SEGV in
 Tcl_FinalizeNotifier(). Thanks to hirofumi for both the bug-report and the
 fix

---
 unix/tclUnixNotfy.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/unix/tclUnixNotfy.c b/unix/tclUnixNotfy.c
index a57a89a..e7ea7a1 100644
--- a/unix/tclUnixNotfy.c
+++ b/unix/tclUnixNotfy.c
@@ -432,9 +432,11 @@ Tcl_FinalizeNotifier(
 			"unable to write q to triggerPipe");
 	    }
 	    close(triggerPipe);
+	    pthread_mutex_lock(&notifierMutex);
 	    while(triggerPipe != -1) {
 		pthread_cond_wait(&notifierCV, &notifierMutex);
 	    }
+	    pthread_mutex_unlock(&notifierMutex);
 	    if (notifierThreadRunning) {
 		int result = pthread_join((pthread_t) notifierThread, NULL);
 
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