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* exceptions.cc (_cygtls::handle_SIGCONT): Reinstate previous behavior but make

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sure that yield() isn't called when signal stack is locked.
This commit is contained in:
Christopher Faylor 2013-06-07 17:09:56 +00:00
parent 0f38043d8b
commit da6461a4d5
2 changed files with 29 additions and 10 deletions
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5
winsup/cygwin/ChangeLog
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@ -1,3 +1,8 @@
2013-06-07 Christopher Faylor <me.cygwin2013@cgf.cx>
* exceptions.cc (_cygtls::handle_SIGCONT): Reinstate previous behavior
but make sure that yield() isn't called when signal stack is locked.
2013-06-07 Christopher Faylor <me.cygwin2013@cgf.cx>
* exceptions.cc (exception::handle): Add comment explaining si_addr

34
winsup/cygwin/exceptions.cc
View File

@ -1256,16 +1256,30 @@ _cygtls::handle_SIGCONT ()
{
myself->stopsig = 0;
myself->process_state &= ~PID_STOPPED;
/* Carefully tell sig_handle_tty_stop to wake up. */
lock ();
sig = SIGCONT;
SetEvent (signal_arrived);
/* Make sure yield doesn't run under lock condition to avoid
starvation of sig_handle_tty_stop. */
unlock ();
/* Wait until sig_handle_tty_stop woke up. */
while (sig)
yield ();
int state = 0;
/* Carefully tell sig_handle_tty_stop to wake up.
Make sure that any pending signal is handled before trying to
send a new one. Then make sure that SIGCONT has been recognized
before exiting the loop. */
while (state < 2)
{
lock ();
bool do_yield = !!sig;
if (do_yield)
/* signal still being processed */;
else if (state)
state++; /* state == 2: signal no longer being processed */
else
{
sig = SIGCONT;
SetEvent (signal_arrived);
state++; /* state == 1: alert sig_handle_tty_stop */
do_yield = true; /* wake up other thread */
}
unlock ();
if (do_yield)
yield ();
}
/* Tell wait_sig to handle any queued signals now that we're alive
again. */
sig_dispatch_pending (false);