diff options
Diffstat (limited to 'nptl/pthread_cancel.c')
| -rw-r--r-- | nptl/pthread_cancel.c | 103 |
1 files changed, 0 insertions, 103 deletions
diff --git a/nptl/pthread_cancel.c b/nptl/pthread_cancel.c deleted file mode 100644 index 231a58df18..0000000000 --- a/nptl/pthread_cancel.c +++ /dev/null @@ -1,103 +0,0 @@ -/* Copyright (C) 2002-2017 Free Software Foundation, Inc. - This file is part of the GNU C Library. - Contributed by Ulrich Drepper <drepper@redhat.com>, 2002. - - 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 - <http://www.gnu.org/licenses/>. */ - -#include <errno.h> -#include <signal.h> -#include <stdlib.h> -#include "pthreadP.h" -#include <atomic.h> -#include <sysdep.h> -#include <unistd.h> - -int -pthread_cancel (pthread_t th) -{ - volatile struct pthread *pd = (volatile struct pthread *) th; - - /* Make sure the descriptor is valid. */ - if (INVALID_TD_P (pd)) - /* Not a valid thread handle. */ - return ESRCH; - -#ifdef SHARED - pthread_cancel_init (); -#endif - int result = 0; - int oldval; - int newval; - do - { - again: - oldval = pd->cancelhandling; - newval = oldval | CANCELING_BITMASK | CANCELED_BITMASK; - - /* Avoid doing unnecessary work. The atomic operation can - potentially be expensive if the bug has to be locked and - remote cache lines have to be invalidated. */ - if (oldval == newval) - break; - - /* If the cancellation is handled asynchronously just send a - signal. We avoid this if possible since it's more - expensive. */ - if (CANCEL_ENABLED_AND_CANCELED_AND_ASYNCHRONOUS (newval)) - { - /* Mark the cancellation as "in progress". */ - if (atomic_compare_and_exchange_bool_acq (&pd->cancelhandling, - oldval | CANCELING_BITMASK, - oldval)) - goto again; - -#ifdef SIGCANCEL - /* The cancellation handler will take care of marking the - thread as canceled. */ - pid_t pid = getpid (); - - INTERNAL_SYSCALL_DECL (err); - int val = INTERNAL_SYSCALL_CALL (tgkill, err, pid, pd->tid, - SIGCANCEL); - if (INTERNAL_SYSCALL_ERROR_P (val, err)) - result = INTERNAL_SYSCALL_ERRNO (val, err); -#else - /* It should be impossible to get here at all, since - pthread_setcanceltype should never have allowed - PTHREAD_CANCEL_ASYNCHRONOUS to be set. */ - abort (); -#endif - - break; - } - - /* A single-threaded process should be able to kill itself, since - there is nothing in the POSIX specification that says that it - cannot. So we set multiple_threads to true so that cancellation - points get executed. */ - THREAD_SETMEM (THREAD_SELF, header.multiple_threads, 1); -#ifndef TLS_MULTIPLE_THREADS_IN_TCB - __pthread_multiple_threads = *__libc_multiple_threads_ptr = 1; -#endif - } - /* Mark the thread as canceled. This has to be done - atomically since other bits could be modified as well. */ - while (atomic_compare_and_exchange_bool_acq (&pd->cancelhandling, newval, - oldval)); - - return result; -} - -PTHREAD_STATIC_FN_REQUIRE (pthread_create) |