| yuezonghe | 824eb0c | 2024-06-27 02:32:26 -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 "pthreadP.h" |
| 21 | |
| 22 | |
| 23 | void |
| 24 | attribute_protected |
| 25 | _pthread_cleanup_push_defer ( |
| 26 | struct _pthread_cleanup_buffer *buffer, |
| 27 | void (*routine) (void *), |
| 28 | void *arg) |
| 29 | { |
| 30 | struct pthread *self = THREAD_SELF; |
| 31 | |
| 32 | buffer->__routine = routine; |
| 33 | buffer->__arg = arg; |
| 34 | buffer->__prev = THREAD_GETMEM (self, cleanup); |
| 35 | |
| 36 | int cancelhandling = THREAD_GETMEM (self, cancelhandling); |
| 37 | |
| 38 | /* Disable asynchronous cancellation for now. */ |
| 39 | if (__builtin_expect (cancelhandling & CANCELTYPE_BITMASK, 0)) |
| 40 | while (1) |
| 41 | { |
| 42 | int curval = THREAD_ATOMIC_CMPXCHG_VAL (self, cancelhandling, |
| 43 | cancelhandling |
| 44 | & ~CANCELTYPE_BITMASK, |
| 45 | cancelhandling); |
| 46 | if (__builtin_expect (curval == cancelhandling, 1)) |
| 47 | /* Successfully replaced the value. */ |
| 48 | break; |
| 49 | |
| 50 | /* Prepare for the next round. */ |
| 51 | cancelhandling = curval; |
| 52 | } |
| 53 | |
| 54 | buffer->__canceltype = (cancelhandling & CANCELTYPE_BITMASK |
| 55 | ? PTHREAD_CANCEL_ASYNCHRONOUS |
| 56 | : PTHREAD_CANCEL_DEFERRED); |
| 57 | |
| 58 | THREAD_SETMEM (self, cleanup, buffer); |
| 59 | } |
| 60 | strong_alias (_pthread_cleanup_push_defer, __pthread_cleanup_push_defer) |
| 61 | |
| 62 | |
| 63 | void |
| 64 | attribute_protected |
| 65 | _pthread_cleanup_pop_restore ( |
| 66 | struct _pthread_cleanup_buffer *buffer, |
| 67 | int execute) |
| 68 | { |
| 69 | struct pthread *self = THREAD_SELF; |
| 70 | |
| 71 | THREAD_SETMEM (self, cleanup, buffer->__prev); |
| 72 | |
| 73 | int cancelhandling; |
| 74 | if (__builtin_expect (buffer->__canceltype != PTHREAD_CANCEL_DEFERRED, 0) |
| 75 | && ((cancelhandling = THREAD_GETMEM (self, cancelhandling)) |
| 76 | & CANCELTYPE_BITMASK) == 0) |
| 77 | { |
| 78 | while (1) |
| 79 | { |
| 80 | int curval = THREAD_ATOMIC_CMPXCHG_VAL (self, cancelhandling, |
| 81 | cancelhandling |
| 82 | | CANCELTYPE_BITMASK, |
| 83 | cancelhandling); |
| 84 | if (__builtin_expect (curval == cancelhandling, 1)) |
| 85 | /* Successfully replaced the value. */ |
| 86 | break; |
| 87 | |
| 88 | /* Prepare for the next round. */ |
| 89 | cancelhandling = curval; |
| 90 | } |
| 91 | |
| 92 | CANCELLATION_P (self); |
| 93 | } |
| 94 | |
| 95 | /* If necessary call the cleanup routine after we removed the |
| 96 | current cleanup block from the list. */ |
| 97 | if (execute) |
| 98 | buffer->__routine (buffer->__arg); |
| 99 | } |
| 100 | strong_alias (_pthread_cleanup_pop_restore, __pthread_cleanup_pop_restore) |