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Fri May 26 13:00:08 1995 Roland McGrath <roland@churchy.gnu.ai.mit.edu>

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* hurd/hurdsig.c (_hurd_internal_post_signal): Don't loop to check
 	pending signals if the thread is in a critical section.  It will
 	send us a msg when it finishes.

	* sysdeps/mach/hurd/pathconf.c: New file.
	* sysdeps/mach/hurd/fpathconf.c: New file.

	* sysdeps/mach/hurd/sigaction.c: Only notify the proc server for
 	SIGCHLD when the SA_NOCLDSTOP bit actually changes.
This commit is contained in:
Roland McGrath
1995-05-27 07:18:52 +00:00
parent 074d099ee3
commit 7cc645ed27
5 changed files with 163 additions and 58 deletions
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128
hurd/hurdsig.c
View File

@ -847,64 +847,78 @@ _hurd_internal_post_signal (struct hurd_sigstate *ss,
/* We get here unless the signal was fatal. We still hold SS->lock.
Check for pending signals, and loop to post them. */
#define PENDING (!_hurd_stopped && (pending = ss->pending & ~ss->blocked))
if (PENDING)
{
pending:
for (signo = 1; signo < NSIG; ++signo)
if (__sigismember (&pending, signo))
{
__sigdelset (&ss->pending, signo);
sigcode = ss->pending_data[signo].code;
sigerror = ss->pending_data[signo].error;
__spin_unlock (&ss->lock);
goto post_signal;
}
}
{
/* Return nonzero if SS has any signals pending we should worry about.
We don't worry about any pending signals if we are stopped, nor if
SS is in a critical section. We are guaranteed to get a sig_post
message before any of them become deliverable: either the SIGCONT
signal, or a sig_post with SIGNO==0 as an explicit poll when the
thread finishes its critical section. */
inline int signals_pending (void)
{
if (_hurd_stopped || ss->critical_section)
return 0;
return pending = ss->pending & ~ss->blocked;
}
/* No pending signals left undelivered for this thread.
If we were sent signal 0, we need to check for pending
signals for all threads. */
if (signo == 0)
{
__spin_unlock (&ss->lock);
__mutex_lock (&_hurd_siglock);
for (ss = _hurd_sigstates; ss != NULL; ss = ss->next)
{
__spin_lock (&ss->lock);
if (PENDING)
goto pending;
__spin_unlock (&ss->lock);
}
__mutex_unlock (&_hurd_siglock);
}
else
{
/* No more signals pending; SS->lock is still locked.
Wake up any sigsuspend call that is blocking SS->thread. */
if (ss->suspended != MACH_PORT_NULL)
{
/* There is a sigsuspend waiting. Tell it to wake up. */
error_t err;
mach_msg_header_t msg;
err = __mach_port_insert_right (__mach_task_self (),
ss->suspended, ss->suspended,
MACH_MSG_TYPE_MAKE_SEND);
assert_perror (err);
msg.msgh_bits = MACH_MSGH_BITS (MACH_MSG_TYPE_MOVE_SEND, 0);
msg.msgh_remote_port = ss->suspended;
msg.msgh_local_port = MACH_PORT_NULL;
/* These values do not matter. */
msg.msgh_id = 8675309; /* Jenny, Jenny. */
msg.msgh_seqno = 17; /* Random. */
ss->suspended = MACH_PORT_NULL;
err = __mach_msg (&msg, MACH_SEND_MSG, sizeof msg, 0,
MACH_PORT_NULL, MACH_MSG_TIMEOUT_NONE,
MACH_PORT_NULL);
assert_perror (err);
}
__spin_unlock (&ss->lock);
}
if (signals_pending ())
{
pending:
for (signo = 1; signo < NSIG; ++signo)
if (__sigismember (&pending, signo))
{
__sigdelset (&ss->pending, signo);
sigcode = ss->pending_data[signo].code;
sigerror = ss->pending_data[signo].error;
__spin_unlock (&ss->lock);
goto post_signal;
}
}
/* No pending signals left undelivered for this thread.
If we were sent signal 0, we need to check for pending
signals for all threads. */
if (signo == 0)
{
__spin_unlock (&ss->lock);
__mutex_lock (&_hurd_siglock);
for (ss = _hurd_sigstates; ss != NULL; ss = ss->next)
{
__spin_lock (&ss->lock);
if (signals_pending ())
goto pending;
__spin_unlock (&ss->lock);
}
__mutex_unlock (&_hurd_siglock);
}
else
{
/* No more signals pending; SS->lock is still locked.
Wake up any sigsuspend call that is blocking SS->thread. */
if (ss->suspended != MACH_PORT_NULL)
{
/* There is a sigsuspend waiting. Tell it to wake up. */
error_t err;
mach_msg_header_t msg;
err = __mach_port_insert_right (__mach_task_self (),
ss->suspended, ss->suspended,
MACH_MSG_TYPE_MAKE_SEND);
assert_perror (err);
msg.msgh_bits = MACH_MSGH_BITS (MACH_MSG_TYPE_MOVE_SEND, 0);
msg.msgh_remote_port = ss->suspended;
msg.msgh_local_port = MACH_PORT_NULL;
/* These values do not matter. */
msg.msgh_id = 8675309; /* Jenny, Jenny. */
msg.msgh_seqno = 17; /* Random. */
ss->suspended = MACH_PORT_NULL;
err = __mach_msg (&msg, MACH_SEND_MSG, sizeof msg, 0,
MACH_PORT_NULL, MACH_MSG_TIMEOUT_NONE,
MACH_PORT_NULL);
assert_perror (err);
}
__spin_unlock (&ss->lock);
}
}
/* All pending signals delivered to all threads.
Now we can send the reply message even for signal 0. */