/* 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, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. */ #include <stdlib.h> #include "pthreadP.h" void __cleanup_fct_attribute __pthread_register_cancel_defer (__pthread_unwind_buf_t *buf) { struct pthread_unwind_buf *ibuf = (struct pthread_unwind_buf *) buf; struct pthread *self = THREAD_SELF; /* Store old info. */ ibuf->priv.data.prev = THREAD_GETMEM (self, cleanup_jmp_buf); ibuf->priv.data.cleanup = 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; } ibuf->priv.data.canceltype = (cancelhandling & CANCELTYPE_BITMASK ? PTHREAD_CANCEL_ASYNCHRONOUS : PTHREAD_CANCEL_DEFERRED); /* Store the new cleanup handler info. */ THREAD_SETMEM (self, cleanup_jmp_buf, (struct pthread_unwind_buf *) buf); } void __cleanup_fct_attribute __pthread_unregister_cancel_restore (__pthread_unwind_buf_t *buf) { struct pthread *self = THREAD_SELF; struct pthread_unwind_buf *ibuf = (struct pthread_unwind_buf *) buf; THREAD_SETMEM (self, cleanup_jmp_buf, ibuf->priv.data.prev); int cancelhandling; if (ibuf->priv.data.canceltype != PTHREAD_CANCEL_DEFERRED && ((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); } }