| 1 | /* Copyright (C) 2002-2022 Free Software Foundation, Inc. |
|---|---|
| 2 | This file is part of the GNU C Library. |
| 3 | |
| 4 | The GNU C Library is free software; you can redistribute it and/or |
| 5 | modify it under the terms of the GNU Lesser General Public |
| 6 | License as published by the Free Software Foundation; either |
| 7 | version 2.1 of the License, or (at your option) any later version. |
| 8 | |
| 9 | The GNU C Library is distributed in the hope that it will be useful, |
| 10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 12 | Lesser General Public License for more details. |
| 13 | |
| 14 | You should have received a copy of the GNU Lesser General Public |
| 15 | License along with the GNU C Library; if not, see |
| 16 | <https://www.gnu.org/licenses/>. */ |
| 17 | |
| 18 | #include <errno.h> |
| 19 | #include "pthreadP.h" |
| 20 | #include <atomic.h> |
| 21 | #include <libc-lockP.h> |
| 22 | |
| 23 | int |
| 24 | __pthread_setcancelstate (int state, int *oldstate) |
| 25 | { |
| 26 | volatile struct pthread *self; |
| 27 | |
| 28 | if (state < PTHREAD_CANCEL_ENABLE || state > PTHREAD_CANCEL_DISABLE) |
| 29 | return EINVAL; |
| 30 | |
| 31 | self = THREAD_SELF; |
| 32 | |
| 33 | int oldval = atomic_load_relaxed (&self->cancelhandling); |
| 34 | while (1) |
| 35 | { |
| 36 | int newval = (state == PTHREAD_CANCEL_DISABLE |
| 37 | ? oldval | CANCELSTATE_BITMASK |
| 38 | : oldval & ~CANCELSTATE_BITMASK); |
| 39 | |
| 40 | if (oldstate != NULL) |
| 41 | *oldstate = ((oldval & CANCELSTATE_BITMASK) |
| 42 | ? PTHREAD_CANCEL_DISABLE : PTHREAD_CANCEL_ENABLE); |
| 43 | |
| 44 | if (oldval == newval) |
| 45 | break; |
| 46 | |
| 47 | if (atomic_compare_exchange_weak_acquire (&self->cancelhandling, |
| 48 | &oldval, newval)) |
| 49 | { |
| 50 | if (cancel_enabled_and_canceled_and_async (value: newval)) |
| 51 | __do_cancel (); |
| 52 | |
| 53 | break; |
| 54 | } |
| 55 | } |
| 56 | |
| 57 | return 0; |
| 58 | } |
| 59 | libc_hidden_def (__pthread_setcancelstate) |
| 60 | weak_alias (__pthread_setcancelstate, pthread_setcancelstate) |
| 61 |