re PR libstdc++/42198 ([C++0x] Using std::thread without -pthread causes immediate crash)

2009-12-17  Paolo Carlini  <paolo.carlini@oracle.com>

	PR libstdc++/42198
	* src/thread.cc (thread::_M_start_thread): Throw system_error
	immediately if the thread system is inactive.

From-SVN: r155308

libstdc++-v3/ChangeLog

+2009-12-17  Paolo Carlini  <paolo.carlini@oracle.com>
+
+	PR libstdc++/42198
+	* src/thread.cc (thread::_M_start_thread): Throw system_error
+	immediately if the thread system is inactive.
+
 2009-12-16  Benjamin Kosnik  <bkoz@redhat.com>
 
 	PR libstdc++/21772 part 2

libstdc++-v3/src/thread.cc

@@ -83,6 +83,9 @@ namespace std
   void
   thread::_M_start_thread(__shared_base_type __b)
   {
+    if (!__gthread_active_p())
+      __throw_system_error(int(errc::operation_not_permitted));
+
     __b->_M_this_ptr = __b;
     int __e = __gthread_create(&_M_id._M_thread,
 			       &execute_native_thread_routine, __b.get());