mirror of
https://sourceware.org/git/glibc.git
synced 2024-09-19 16:10:01 +00:00
92 lines
2.6 KiB
C
92 lines
2.6 KiB
C
/* Thread cancellation support.
|
|
Copyright (C) 1995-2023 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 of the License, or (at your option) any later version.
|
|
|
|
The GNU C Library is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library; if not, see
|
|
<https://www.gnu.org/licenses/>. */
|
|
|
|
#include <hurd/signal.h>
|
|
#include <hurd/interrupt.h>
|
|
#include <assert.h>
|
|
#include <thread_state.h>
|
|
|
|
|
|
error_t
|
|
hurd_thread_cancel (thread_t thread)
|
|
{
|
|
struct hurd_sigstate *ss = _hurd_thread_sigstate (thread);
|
|
struct machine_thread_all_state state;
|
|
int state_change;
|
|
error_t err;
|
|
|
|
if (! ss)
|
|
return EINVAL;
|
|
if (ss == _hurd_self_sigstate ())
|
|
{
|
|
/* We are cancelling ourselves, so it is easy to succeed
|
|
quickly. Since this function is not a cancellation point, we
|
|
just leave the flag set pending the next cancellation point
|
|
(hurd_check_cancel or RPC) and return success. */
|
|
ss->cancel = 1;
|
|
return 0;
|
|
}
|
|
|
|
assert (! __spin_lock_locked (&ss->critical_section_lock));
|
|
__spin_lock (&ss->critical_section_lock);
|
|
__spin_lock (&ss->lock);
|
|
err = __thread_suspend (thread);
|
|
__spin_unlock (&ss->lock);
|
|
|
|
if (! err)
|
|
{
|
|
/* Set the flag telling the thread its operation is being cancelled. */
|
|
ss->cancel = 1;
|
|
|
|
/* Interrupt any interruptible RPC now in progress. */
|
|
state.set = 0;
|
|
_hurdsig_abort_rpcs (ss, 0, 0, &state, &state_change, NULL);
|
|
if (state_change)
|
|
err = __thread_set_state (thread, MACHINE_THREAD_STATE_FLAVOR,
|
|
(natural_t *) &state.basic,
|
|
MACHINE_THREAD_STATE_COUNT);
|
|
|
|
if (ss->cancel_hook)
|
|
/* The code being cancelled has a special wakeup function.
|
|
Calling this should make the thread wake up and check the
|
|
cancellation flag. */
|
|
(*ss->cancel_hook) ();
|
|
|
|
__thread_resume (thread);
|
|
}
|
|
|
|
_hurd_critical_section_unlock (ss);
|
|
return err;
|
|
}
|
|
|
|
|
|
int
|
|
hurd_check_cancel (void)
|
|
{
|
|
struct hurd_sigstate *ss = _hurd_self_sigstate ();
|
|
int cancel;
|
|
|
|
__spin_lock (&ss->lock);
|
|
assert (! __spin_lock_locked (&ss->critical_section_lock));
|
|
cancel = ss->cancel;
|
|
ss->cancel = 0;
|
|
__spin_unlock (&ss->lock);
|
|
|
|
return cancel;
|
|
}
|