/* Copyright (C) 2002, 2003 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 "pthreadP.h" void attribute_protected __pthread_cleanup_push_defer ( struct _pthread_cleanup_buffer *buffer, void (*routine) (void *), void *arg) { struct pthread *self = THREAD_SELF; buffer->__routine = routine; buffer->__arg = arg; buffer->__prev = THREAD_GETMEM (self, cleanup); int cancelhandling = THREAD_GETMEM (self, cancelhandling); /* Disable asynchronous cancellation for now. */ if (__builtin_expect (cancelhandling & CANCELTYPE_BITMASK, 0)) while (1) { int curval = THREAD_ATOMIC_CMPXCHG_VAL (self, cancelhandling, cancelhandling & ~CANCELTYPE_BITMASK, cancelhandling); if (__builtin_expect (curval == cancelhandling, 1)) /* Successfully replaced the value. */ break; /* Prepare for the next round. */ cancelhandling = curval; } buffer->__canceltype = (cancelhandling & CANCELTYPE_BITMASK ? PTHREAD_CANCEL_ASYNCHRONOUS : PTHREAD_CANCEL_DEFERRED); THREAD_SETMEM (self, cleanup, buffer); } strong_alias (__pthread_cleanup_push_defer, _pthread_cleanup_push_defer) void attribute_protected __pthread_cleanup_pop_restore ( struct _pthread_cleanup_buffer *buffer, int execute) { struct pthread *self = THREAD_SELF; THREAD_SETMEM (self, cleanup, buffer->__prev); int cancelhandling; if (__builtin_expect (buffer->__canceltype != PTHREAD_CANCEL_DEFERRED, 0) && ((cancelhandling = THREAD_GETMEM (self, cancelhandling)) & CANCELTYPE_BITMASK) == 0) { while (1) { int curval = THREAD_ATOMIC_CMPXCHG_VAL (self, cancelhandling, cancelhandling | CANCELTYPE_BITMASK, cancelhandling); if (__builtin_expect (curval == cancelhandling, 1)) /* Successfully replaced the value. */ break; /* Prepare for the next round. */ cancelhandling = curval; } CANCELLATION_P (self); } /* If necessary call the cleanup routine after we removed the current cleanup block from the list. */ if (execute) buffer->__routine (buffer->__arg); } strong_alias (__pthread_cleanup_pop_restore, _pthread_cleanup_pop_restore)