1 | /* pthread_mutex_trylock. Hurd version. |
2 | Copyright (C) 2016-2024 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 <pthread.h> |
20 | #include <stdlib.h> |
21 | #include <assert.h> |
22 | #include <pt-internal.h> |
23 | #include "pt-mutex.h" |
24 | #include <hurdlock.h> |
25 | |
26 | int |
27 | __pthread_mutex_trylock (pthread_mutex_t *mtxp) |
28 | { |
29 | struct __pthread *self; |
30 | int ret; |
31 | |
32 | switch (MTX_TYPE (mtxp)) |
33 | { |
34 | case PT_MTX_NORMAL: |
35 | ret = lll_trylock (mtxp->__lock); |
36 | if (ret) |
37 | ret = EBUSY; |
38 | break; |
39 | |
40 | case PT_MTX_RECURSIVE: |
41 | self = _pthread_self (); |
42 | if (mtx_owned_p (mtxp, self, mtxp->__flags)) |
43 | { |
44 | if (__glibc_unlikely (mtxp->__cnt + 1 == 0)) |
45 | return EAGAIN; |
46 | |
47 | ++mtxp->__cnt; |
48 | ret = 0; |
49 | } |
50 | else if ((ret = lll_trylock (mtxp->__lock)) == 0) |
51 | { |
52 | mtx_set_owner (mtxp, self, mtxp->__flags); |
53 | mtxp->__cnt = 1; |
54 | } |
55 | else |
56 | ret = EBUSY; |
57 | |
58 | break; |
59 | |
60 | case PT_MTX_ERRORCHECK: |
61 | self = _pthread_self (); |
62 | if ((ret = lll_trylock (mtxp->__lock)) == 0) |
63 | mtx_set_owner (mtxp, self, mtxp->__flags); |
64 | else |
65 | ret = EBUSY; |
66 | break; |
67 | |
68 | case PT_MTX_NORMAL | PTHREAD_MUTEX_ROBUST: |
69 | case PT_MTX_RECURSIVE | PTHREAD_MUTEX_ROBUST: |
70 | case PT_MTX_ERRORCHECK | PTHREAD_MUTEX_ROBUST: |
71 | self = _pthread_self (); |
72 | ROBUST_LOCK (self, mtxp, lll_robust_trylock); |
73 | break; |
74 | |
75 | default: |
76 | ret = EINVAL; |
77 | break; |
78 | } |
79 | |
80 | return ret; |
81 | } |
82 | |
83 | hidden_def (__pthread_mutex_trylock) |
84 | strong_alias (__pthread_mutex_trylock, _pthread_mutex_trylock) |
85 | weak_alias (__pthread_mutex_trylock, pthread_mutex_trylock) |
86 | |