| 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 <shlib-compat.h> |
|---|
| 22 | |
|---|
| 23 | int |
|---|
| 24 | ___pthread_detach (pthread_t th) |
|---|
| 25 | { |
|---|
| 26 | struct pthread *pd = (struct pthread *) th; |
|---|
| 27 | |
|---|
| 28 | /* Make sure the descriptor is valid. */ |
|---|
| 29 | if (INVALID_NOT_TERMINATED_TD_P (pd)) |
|---|
| 30 | /* Not a valid thread handle. */ |
|---|
| 31 | return ESRCH; |
|---|
| 32 | |
|---|
| 33 | int result = 0; |
|---|
| 34 | |
|---|
| 35 | /* Mark the thread as detached. */ |
|---|
| 36 | if (atomic_compare_and_exchange_bool_acq (&pd->joinid, pd, NULL)) |
|---|
| 37 | { |
|---|
| 38 | /* There are two possibilities here. First, the thread might |
|---|
| 39 | already be detached. In this case we return EINVAL. |
|---|
| 40 | Otherwise there might already be a waiter. The standard does |
|---|
| 41 | not mention what happens in this case. */ |
|---|
| 42 | if (IS_DETACHED (pd)) |
|---|
| 43 | result = EINVAL; |
|---|
| 44 | } |
|---|
| 45 | else |
|---|
| 46 | /* Check whether the thread terminated meanwhile. In this case we |
|---|
| 47 | will just free the TCB. */ |
|---|
| 48 | if ((pd->cancelhandling & EXITING_BITMASK) != 0) |
|---|
| 49 | /* Note that the code in __free_tcb makes sure each thread |
|---|
| 50 | control block is freed only once. */ |
|---|
| 51 | __nptl_free_tcb (pd); |
|---|
| 52 | |
|---|
| 53 | return result; |
|---|
| 54 | } |
|---|
| 55 | versioned_symbol (libc, ___pthread_detach, pthread_detach, GLIBC_2_34); |
|---|
| 56 | libc_hidden_ver (___pthread_detach, __pthread_detach) |
|---|
| 57 | #ifndef SHARED |
|---|
| 58 | strong_alias (___pthread_detach, __pthread_detach) |
|---|
| 59 | #endif |
|---|
| 60 | |
|---|
| 61 | #if OTHER_SHLIB_COMPAT (libpthread, GLIBC_2_0, GLIBC_2_34) |
|---|
| 62 | compat_symbol (libc, ___pthread_detach, pthread_detach, GLIBC_2_0); |
|---|
| 63 | #endif |
|---|
| 64 | |
|---|
