From 72376991f5c43b445f266ab25f73c1c41d6393f0 Mon Sep 17 00:00:00 2001
From: "jan.nijtmans" <nijtmans@users.sourceforge.net>
Date: Mon, 21 Mar 2016 12:03:17 +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 48ba0cc..1457890 100644
--- a/unix/tclUnixNotfy.c
+++ b/unix/tclUnixNotfy.c
@@ -433,9 +433,11 @@ 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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