lh | 9ed821d | 2023-04-07 01:36:19 -0700 | [diff] [blame^] | 1 | /* Copyright (C) 2002, 2003 Free Software Foundation, Inc. |
| 2 | This file is part of the GNU C Library. |
| 3 | Contributed by Ulrich Drepper <drepper@redhat.com>, 2002. |
| 4 | |
| 5 | The GNU C Library is free software; you can redistribute it and/or |
| 6 | modify it under the terms of the GNU Lesser General Public |
| 7 | License as published by the Free Software Foundation; either |
| 8 | version 2.1 of the License, or (at your option) any later version. |
| 9 | |
| 10 | The GNU C Library is distributed in the hope that it will be useful, |
| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 13 | Lesser General Public License for more details. |
| 14 | |
| 15 | You should have received a copy of the GNU Lesser General Public |
| 16 | License along with the GNU C Library; if not, write to the Free |
| 17 | Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
| 18 | 02111-1307 USA. */ |
| 19 | |
| 20 | #include <stdlib.h> |
| 21 | #include "pthreadP.h" |
| 22 | |
| 23 | |
| 24 | void |
| 25 | __cleanup_fct_attribute |
| 26 | __pthread_register_cancel_defer (__pthread_unwind_buf_t *buf) |
| 27 | { |
| 28 | struct pthread_unwind_buf *ibuf = (struct pthread_unwind_buf *) buf; |
| 29 | struct pthread *self = THREAD_SELF; |
| 30 | |
| 31 | /* Store old info. */ |
| 32 | ibuf->priv.data.prev = THREAD_GETMEM (self, cleanup_jmp_buf); |
| 33 | ibuf->priv.data.cleanup = THREAD_GETMEM (self, cleanup); |
| 34 | |
| 35 | int cancelhandling = THREAD_GETMEM (self, cancelhandling); |
| 36 | |
| 37 | /* Disable asynchronous cancellation for now. */ |
| 38 | if (__builtin_expect (cancelhandling & CANCELTYPE_BITMASK, 0)) |
| 39 | while (1) |
| 40 | { |
| 41 | int curval = THREAD_ATOMIC_CMPXCHG_VAL (self, cancelhandling, |
| 42 | cancelhandling |
| 43 | & ~CANCELTYPE_BITMASK, |
| 44 | cancelhandling); |
| 45 | if (__builtin_expect (curval == cancelhandling, 1)) |
| 46 | /* Successfully replaced the value. */ |
| 47 | break; |
| 48 | |
| 49 | /* Prepare for the next round. */ |
| 50 | cancelhandling = curval; |
| 51 | } |
| 52 | |
| 53 | ibuf->priv.data.canceltype = (cancelhandling & CANCELTYPE_BITMASK |
| 54 | ? PTHREAD_CANCEL_ASYNCHRONOUS |
| 55 | : PTHREAD_CANCEL_DEFERRED); |
| 56 | |
| 57 | /* Store the new cleanup handler info. */ |
| 58 | THREAD_SETMEM (self, cleanup_jmp_buf, (struct pthread_unwind_buf *) buf); |
| 59 | } |
| 60 | |
| 61 | |
| 62 | void |
| 63 | __cleanup_fct_attribute |
| 64 | __pthread_unregister_cancel_restore (__pthread_unwind_buf_t *buf) |
| 65 | { |
| 66 | struct pthread *self = THREAD_SELF; |
| 67 | struct pthread_unwind_buf *ibuf = (struct pthread_unwind_buf *) buf; |
| 68 | |
| 69 | THREAD_SETMEM (self, cleanup_jmp_buf, ibuf->priv.data.prev); |
| 70 | |
| 71 | int cancelhandling; |
| 72 | if (ibuf->priv.data.canceltype != PTHREAD_CANCEL_DEFERRED |
| 73 | && ((cancelhandling = THREAD_GETMEM (self, cancelhandling)) |
| 74 | & CANCELTYPE_BITMASK) == 0) |
| 75 | { |
| 76 | while (1) |
| 77 | { |
| 78 | int curval = THREAD_ATOMIC_CMPXCHG_VAL (self, cancelhandling, |
| 79 | cancelhandling |
| 80 | | CANCELTYPE_BITMASK, |
| 81 | cancelhandling); |
| 82 | if (__builtin_expect (curval == cancelhandling, 1)) |
| 83 | /* Successfully replaced the value. */ |
| 84 | break; |
| 85 | |
| 86 | /* Prepare for the next round. */ |
| 87 | cancelhandling = curval; |
| 88 | } |
| 89 | |
| 90 | CANCELLATION_P (self); |
| 91 | } |
| 92 | } |