1 /* pthread_mutex_lock. Hurd version.
2 Copyright (C) 2016-2022 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 <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
__pthread_mutex_lock(pthread_mutex_t * mtxp)27 __pthread_mutex_lock (pthread_mutex_t *mtxp)
28 {
29 struct __pthread *self;
30 int flags = mtxp->__flags & GSYNC_SHARED;
31 int ret = 0;
32
33 switch (MTX_TYPE (mtxp))
34 {
35 case PT_MTX_NORMAL:
36 lll_lock (mtxp->__lock, flags);
37 break;
38
39 case PT_MTX_RECURSIVE:
40 self = _pthread_self ();
41 if (mtx_owned_p (mtxp, self, flags))
42 {
43 if (__glibc_unlikely (mtxp->__cnt + 1 == 0))
44 return EAGAIN;
45
46 ++mtxp->__cnt;
47 return ret;
48 }
49
50 lll_lock (mtxp->__lock, flags);
51 mtx_set_owner (mtxp, self, flags);
52 mtxp->__cnt = 1;
53 break;
54
55 case PT_MTX_ERRORCHECK:
56 self = _pthread_self ();
57 if (mtx_owned_p (mtxp, self, flags))
58 return EDEADLK;
59
60 lll_lock (mtxp->__lock, flags);
61 mtx_set_owner (mtxp, self, flags);
62 break;
63
64 case PT_MTX_NORMAL | PTHREAD_MUTEX_ROBUST:
65 case PT_MTX_RECURSIVE | PTHREAD_MUTEX_ROBUST:
66 case PT_MTX_ERRORCHECK | PTHREAD_MUTEX_ROBUST:
67 self = _pthread_self ();
68 ROBUST_LOCK (self, mtxp, lll_robust_lock, flags);
69 break;
70
71 default:
72 ret = EINVAL;
73 break;
74 }
75
76 return ret;
77 }
78
79 hidden_def (__pthread_mutex_lock)
80 strong_alias (__pthread_mutex_lock, _pthread_mutex_lock)
81 weak_alias (__pthread_mutex_lock, pthread_mutex_lock)
82