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* sigproc.cc (exit_thread): Allow to exit the thread while running 

global dtors.  Explain why.
This commit is contained in:
Corinna Vinschen 2013-06-03 09:48:54 +00:00
parent 8516b54215
commit 69154cfd6b
2 changed files with 15 additions and 1 deletions
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5
winsup/cygwin/ChangeLog
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@ -1,3 +1,8 @@
2013-06-03 Corinna Vinschen <corinna@vinschen.de>
* sigproc.cc (exit_thread): Allow to exit the thread while running
global dtors. Explain why.
2013-06-02 Corinna Vinschen <corinna@vinschen.de>
* autoload.cc (CancelSynchronousIo): Define.

11
winsup/cygwin/sigproc.cc
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@ -447,7 +447,16 @@ exit_thread (DWORD res)
# undef ExitThread
sigfillset (&_my_tls.sigmask); /* No signals wanted */
lock_process for_now; /* May block indefinitely when exiting. */
if (exit_state)
/* ES_EXIT_STARTING indicates that exit is in progress. After setting
exit_state to ES_EXIT_STARTING, the global dtors are running first,
then the exit state is set to the next level in do_exit. We must not
block the thread exit while the global dtors are running, because
one of them might have called pthread_join, which is perfectly valid
for a global C++ destructor.
FIXME: Do we need another state between ES_EXIT_STARTING and
ES_SIGNAL_EXIT to narrow the gap in which the thread exit
is still valid? */
if (exit_state > ES_EXIT_STARTING)
{
for_now.release ();
Sleep (INFINITE);