--- a/hotspot/src/os/posix/vm/os_posix.cpp	Wed Oct 16 10:52:41 2013 +0200
+++ b/hotspot/src/os/posix/vm/os_posix.cpp	Tue Nov 05 17:38:04 2013 -0800
@@ -32,6 +32,8 @@
 #include <unistd.h>
 #include <sys/resource.h>
 #include <sys/utsname.h>
+#include <pthread.h>
+#include <signal.h>
 
 // Todo: provide a os::get_max_process_id() or similar. Number of processes
 // may have been configured, can be read more accurately from proc fs etc.
@@ -805,11 +807,17 @@
  * The callback is supposed to provide the method that should be protected.
  */
 bool os::WatcherThreadCrashProtection::call(os::CrashProtectionCallback& cb) {
+  sigset_t saved_sig_mask;
+
   assert(Thread::current()->is_Watcher_thread(), "Only for WatcherThread");
   assert(!WatcherThread::watcher_thread()->has_crash_protection(),
       "crash_protection already set?");
 
-  if (sigsetjmp(_jmpbuf, 1) == 0) {
+  // we cannot rely on sigsetjmp/siglongjmp to save/restore the signal mask
+  // since on at least some systems (OS X) siglongjmp will restore the mask
+  // for the process, not the thread
+  pthread_sigmask(0, NULL, &saved_sig_mask);
+  if (sigsetjmp(_jmpbuf, 0) == 0) {
     // make sure we can see in the signal handler that we have crash protection
     // installed
     WatcherThread::watcher_thread()->set_crash_protection(this);
@@ -819,6 +827,7 @@
     return true;
   }
   // this happens when we siglongjmp() back
+  pthread_sigmask(SIG_SETMASK, &saved_sig_mask, NULL);
   WatcherThread::watcher_thread()->set_crash_protection(NULL);
   return false;
 }