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* thread.h (class pthread): Add bool member canceled.

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* thread.cc (pthread::pthread): Initialize canceled to false.
	(pthread::cancel): Set canceled before setting cancel_event.
	(pthread::testcancel): Check for canceled.  Only wait for cancel_event
	if canceled is true.  Explain why.
	(pthread::_fixup_after_fork): Set canceled to false.
This commit is contained in:
Corinna Vinschen
2011-04-30 10:20:25 +00:00
parent e0b0b9e4ff
commit 42faed4128
3 changed files with 23 additions and 3 deletions
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16
winsup/cygwin/thread.cc
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@ -378,7 +378,7 @@ List<pthread> pthread::threads;
/* member methods */
pthread::pthread ():verifyable_object (PTHREAD_MAGIC), win32_obj_id (0),
valid (false), suspended (false),
valid (false), suspended (false), canceled (false),
cancelstate (0), canceltype (0), cancel_event (0),
joiner (NULL), next (NULL), cleanup_stack (NULL)
{
@ -538,6 +538,7 @@ pthread::cancel ()
{
// cancel deferred
mutex.unlock ();
canceled = true;
SetEvent (cancel_event);
return 0;
}
@ -871,8 +872,16 @@ pthread::testcancel ()
if (cancelstate == PTHREAD_CANCEL_DISABLE)
return;
if (IsEventSignalled (cancel_event))
cancel_self ();
/* We check for the canceled flag first. This allows to use the
pthread_testcancel function a lot without adding the overhead of
an OS call. Only if the thread is marked as canceled, we wait for
cancel_event being really set, on the off-chance that pthread_cancel
gets interrupted before calling SetEvent. */
if (canceled)
{
WaitForSingleObject (cancel_event, INFINITE);
cancel_self ();
}
}
void
@ -1039,6 +1048,7 @@ pthread::_fixup_after_fork ()
magic = 0;
valid = false;
win32_obj_id = NULL;
canceled = false;
cancel_event = NULL;
}
}