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* sigproc.cc (wait_sig): Ensure that myself->getsigtodo array is flushed on a

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__SIGFLUSH.  Christopher Faylor <cgf@redhat.com>
* exceptions.cc (_sigreturn): Handle nested signals without growing the stack.
This commit is contained in:
Christopher Faylor
2003-08-20 05:15:33 +00:00
parent 5f31e0f305
commit 6f6d673cc5
3 changed files with 43 additions and 18 deletions
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41
winsup/cygwin/sigproc.cc
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@@ -1116,9 +1116,20 @@ wait_sig (VOID *self)
HANDLE catchem[] = {sigcatch_main, sigcatch_nonmain, sigcatch_nosync};
sigproc_printf ("Ready. dwProcessid %d", myself->dwProcessId);
DWORD rc = RC_NOSYNC;
bool flush = false;
for (;;)
{
DWORD rc = WaitForMultipleObjects (3, catchem, FALSE, sig_loop_wait);
DWORD i;
if (rc == RC_MAIN || rc == RC_NONMAIN)
i = RC_NOSYNC;
else
i = RC_MAIN;
rc = WaitForSingleObject (catchem[i], 0);
if (rc != WAIT_OBJECT_0)
rc = WaitForMultipleObjects (3, catchem, FALSE, sig_loop_wait);
else
rc = i + WAIT_OBJECT_0;
(void) SetThreadPriority (GetCurrentThread (), WAIT_SIG_PRIORITY);
/* sigproc_terminate sets sig_loop_wait to zero to indicate that
@@ -1159,7 +1170,7 @@ wait_sig (VOID *self)
/* A sigcatch semaphore has been signaled. Scan the sigtodo
* array looking for any unprocessed signals.
*/
pending_signals = false;
pending_signals = 0;
bool saw_failed_interrupt = false;
for (LONG **todo = todos; todo <= end_todo; todo++)
for (int sig = -__SIGOFFSET; sig < NSIG; sig++)
@@ -1178,8 +1189,8 @@ wait_sig (VOID *self)
(sig != SIGCONT && ISSTATE (myself, PID_STOPPED))))
{
sigproc_printf ("signal %d blocked", sig);
InterlockedIncrement (*todo + sig);
pending_signals = true; // FIXME: This will cause unnecessary sig_dispatch_pending spins
InterlockedIncrement (myself->getsigtodo (sig));
}
else
{
@@ -1188,7 +1199,12 @@ wait_sig (VOID *self)
switch (sig)
{
case __SIGFLUSH:
/* just forcing the loop */
if (rc == RC_MAIN)
{
flush = true;
ReleaseSemaphore (sigcatch_nosync, 1, NULL);
goto out1;
}
break;
/* Internal signal to turn on stracing. */
@@ -1206,8 +1222,9 @@ wait_sig (VOID *self)
if (!sig_handle (sig))
{
sigproc_printf ("couldn't send signal %d", sig);
pending_signals = saw_failed_interrupt = true;
ReleaseSemaphore (sigcatch_nosync, 1, NULL);
saw_failed_interrupt = true;
pending_signals = true;
InterlockedIncrement (myself->getsigtodo (sig));
}
}
@@ -1222,19 +1239,15 @@ wait_sig (VOID *self)
out:
/* Signal completion of signal handling depending on which semaphore
woke up the WaitForMultipleObjects above. */
switch (rc)
if (rc == RC_NONMAIN) // FIXME: This is broken
ReleaseSemaphore (sigcomplete_nonmain, 1, NULL);
else if (rc == RC_MAIN || flush)
{
case RC_MAIN:
SetEvent (sigcomplete_main);
sigproc_printf ("set main thread completion event");
break;
case RC_NONMAIN:
ReleaseSemaphore (sigcomplete_nonmain, 1, NULL);
break;
default:
/* Signal from another process. No need to synchronize. */
break;
flush = false;
}
out1:
if (saw_failed_interrupt)
low_priority_sleep (SLEEP_0_STAY_LOW); /* Hopefully, other thread will be waking up soon. */
sigproc_printf ("looping");