1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
|
/* pthread_mutex_trylock. Hurd version.
Copyright (C) 2016-2018 Free Software Foundation, Inc.
This file is part of the GNU C Library.
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License
as published by the Free Software Foundation; either
version 2 of the license, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with this program; if not, see
<http://www.gnu.org/licenses/>.
*/
#include <pthread.h>
#include <stdlib.h>
#include <assert.h>
#include <pt-internal.h>
#include "pt-mutex.h"
#include <hurdlock.h>
int
__pthread_mutex_trylock (pthread_mutex_t *mtxp)
{
struct __pthread *self;
int ret;
switch (MTX_TYPE (mtxp))
{
case PT_MTX_NORMAL:
ret = lll_trylock (&mtxp->__lock);
if (ret)
ret = EBUSY;
break;
case PT_MTX_RECURSIVE:
self = _pthread_self ();
if (mtx_owned_p (mtxp, self, mtxp->__flags))
{
if (__glibc_unlikely (mtxp->__cnt + 1 == 0))
return EAGAIN;
++mtxp->__cnt;
ret = 0;
}
else if ((ret = lll_trylock (&mtxp->__lock)) == 0)
{
mtx_set_owner (mtxp, self, mtxp->__flags);
mtxp->__cnt = 1;
}
else
ret = EBUSY;
break;
case PT_MTX_ERRORCHECK:
self = _pthread_self ();
if ((ret = lll_trylock (&mtxp->__lock)) == 0)
mtx_set_owner (mtxp, self, mtxp->__flags);
else
ret = EBUSY;
break;
case PT_MTX_NORMAL | PTHREAD_MUTEX_ROBUST:
case PT_MTX_RECURSIVE | PTHREAD_MUTEX_ROBUST:
case PT_MTX_ERRORCHECK | PTHREAD_MUTEX_ROBUST:
self = _pthread_self ();
ROBUST_LOCK (self, mtxp, __lll_robust_trylock);
break;
default:
ret = EINVAL;
break;
}
return ret;
}
strong_alias (__pthread_mutex_trylock, _pthread_mutex_trylock)
strong_alias (__pthread_mutex_trylock, pthread_mutex_trylock)
|
