From f488964d6725d7c3302d7b4316143b897ca04f8a Mon Sep 17 00:00:00 2001
From: xlu <unknown>
Date: Fri, 15 Aug 2008 10:08:20 -0700
Subject: [PATCH] 6608862: segv in JvmtiEnvBase::check_for_periodic_clean_up()
 Reviewed-by: dholmes, dcubed, jcoomes

---
 src/share/vm/runtime/thread.cpp | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/src/share/vm/runtime/thread.cpp b/src/share/vm/runtime/thread.cpp
index 85919814b..5a09f774b 100644
--- a/src/share/vm/runtime/thread.cpp
+++ b/src/share/vm/runtime/thread.cpp
@@ -2756,7 +2756,13 @@ void Threads::threads_do(ThreadClosure* tc) {
   // For now, just manually iterate through them.
   tc->do_thread(VMThread::vm_thread());
   Universe::heap()->gc_threads_do(tc);
-  tc->do_thread(WatcherThread::watcher_thread());
+  {
+    // Grab the Terminator_lock to prevent watcher_thread from being terminated.
+    MutexLockerEx mu(Terminator_lock, Mutex::_no_safepoint_check_flag);
+    WatcherThread *wt = WatcherThread::watcher_thread();
+    if (wt != NULL)
+      tc->do_thread(wt);
+  }
   // If CompilerThreads ever become non-JavaThreads, add them here
 }
 
-- 
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