| 1 | /* Detach a thread. |
|---|---|
| 2 | Copyright (C) 2000-2022 Free Software Foundation, Inc. |
| 3 | This file is part of the GNU C Library. |
| 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, see |
| 17 | <https://www.gnu.org/licenses/>. */ |
| 18 | |
| 19 | #include <errno.h> |
| 20 | #include <pthread.h> |
| 21 | #include <stddef.h> |
| 22 | |
| 23 | #include <pt-internal.h> |
| 24 | |
| 25 | /* Indicate that the storage for THREAD can be reclaimed when it |
| 26 | terminates. */ |
| 27 | int |
| 28 | __pthread_detach (pthread_t thread) |
| 29 | { |
| 30 | struct __pthread *pthread; |
| 31 | int err = 0; |
| 32 | |
| 33 | /* Lookup the thread structure for THREAD. */ |
| 34 | pthread = __pthread_getid (thread); |
| 35 | if (pthread == NULL) |
| 36 | return ESRCH; |
| 37 | |
| 38 | __pthread_mutex_lock (&pthread->state_lock); |
| 39 | |
| 40 | switch (pthread->state) |
| 41 | { |
| 42 | case PTHREAD_JOINABLE: |
| 43 | /* THREAD still running. Mark it as detached such that its |
| 44 | resources can be reclaimed as soon as the thread exits. */ |
| 45 | pthread->state = PTHREAD_DETACHED; |
| 46 | |
| 47 | /* Broadcast the condition. This will make threads that are |
| 48 | waiting to join THREAD continue with hopefully disastrous |
| 49 | consequences instead of blocking indefinitely. */ |
| 50 | __pthread_cond_broadcast (&pthread->state_cond); |
| 51 | __pthread_mutex_unlock (&pthread->state_lock); |
| 52 | |
| 53 | __pthread_dealloc (thread: pthread); |
| 54 | break; |
| 55 | |
| 56 | case PTHREAD_EXITED: |
| 57 | __pthread_mutex_unlock (&pthread->state_lock); |
| 58 | |
| 59 | /* THREAD has already exited. PTHREAD remained after the thread |
| 60 | exited in order to provide the exit status, but it turns out |
| 61 | it won't be needed. */ |
| 62 | __pthread_dealloc (thread: pthread); |
| 63 | break; |
| 64 | |
| 65 | default: |
| 66 | /* Thou shalt not detach non-joinable threads! */ |
| 67 | __pthread_mutex_unlock (&pthread->state_lock); |
| 68 | err = EINVAL; |
| 69 | break; |
| 70 | } |
| 71 | |
| 72 | return err; |
| 73 | } |
| 74 | weak_alias (__pthread_detach, pthread_detach) |
| 75 | hidden_def (__pthread_detach) |
| 76 |