From 862c36a08bebf0e75367ad7ed862cdaa2efe5c25 Mon Sep 17 00:00:00 2001
From: Robert Osfield <robert@openscenegraph.com>
Date: Sun, 25 Mar 2018 12:13:50 +0100
Subject: [PATCH] Added check if thraeding is running before executing start
 thread.

---
 src/OpenThreads/pthreads/PThread.cpp  | 8 ++++++--
 src/OpenThreads/win32/Win32Thread.cpp | 5 +++++
 2 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/src/OpenThreads/pthreads/PThread.cpp b/src/OpenThreads/pthreads/PThread.cpp
index f74529045..3b6b6e838 100644
--- a/src/OpenThreads/pthreads/PThread.cpp
+++ b/src/OpenThreads/pthreads/PThread.cpp
@@ -603,6 +603,12 @@ bool Thread::isRunning()
 //
 int Thread::start() {
 
+    PThreadPrivateData *pd = static_cast<PThreadPrivateData *> (_prvData);
+    if (pd->isRunning())
+    {
+        return 0;
+    }
+
     int status;
     pthread_attr_t thread_attr;
 
@@ -612,8 +618,6 @@ int Thread::start() {
         return status;
     }
 
-    PThreadPrivateData *pd = static_cast<PThreadPrivateData *> (_prvData);
-
     //-------------------------------------------------------------------------
     // Set the stack size if requested, but not less than a platform reasonable
     // value.
diff --git a/src/OpenThreads/win32/Win32Thread.cpp b/src/OpenThreads/win32/Win32Thread.cpp
index b0110dd41..ce1db0b73 100644
--- a/src/OpenThreads/win32/Win32Thread.cpp
+++ b/src/OpenThreads/win32/Win32Thread.cpp
@@ -334,6 +334,11 @@ bool Thread::isRunning() {
 int Thread::start() {
 
     Win32ThreadPrivateData *pd = static_cast<Win32ThreadPrivateData *> (_prvData);
+    if (pd->isRunning)
+    {
+        return 0;
+    }
+
     //-------------------------------------------------------------------------
     // Prohibit the stack size from being changed.
     // (bb 5/13/2005) it actually doesn't matter.