Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1// SPDX-License-Identifier: GPL-2.0
2#include "mutex.h"
3
4#include "debug.h"
5#include <linux/string.h>
6#include <errno.h>
7
8static void check_err(const char *fn, int err)
9{
10 char sbuf[STRERR_BUFSIZE];
11
12 if (err == 0)
13 return;
14
15 pr_err("%s error: '%s'\n", fn, str_error_r(err, sbuf, sizeof(sbuf)));
16}
17
18#define CHECK_ERR(err) check_err(__func__, err)
19
20static void __mutex_init(struct mutex *mtx, bool pshared, bool recursive)
21{
22 pthread_mutexattr_t attr;
23
24 CHECK_ERR(pthread_mutexattr_init(&attr));
25
26#ifndef NDEBUG
27 /* In normal builds enable error checking, such as recursive usage. */
28 CHECK_ERR(pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_ERRORCHECK));
29#endif
30 if (recursive)
31 CHECK_ERR(pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE));
32 if (pshared)
33 CHECK_ERR(pthread_mutexattr_setpshared(&attr, PTHREAD_PROCESS_SHARED));
34 CHECK_ERR(pthread_mutex_init(&mtx->lock, &attr));
35 CHECK_ERR(pthread_mutexattr_destroy(&attr));
36}
37
38void mutex_init(struct mutex *mtx)
39{
40 __mutex_init(mtx, /*pshared=*/false, /*recursive=*/false);
41}
42
43void mutex_init_pshared(struct mutex *mtx)
44{
45 __mutex_init(mtx, /*pshared=*/true, /*recursive=*/false);
46}
47
48void mutex_init_recursive(struct mutex *mtx)
49{
50 __mutex_init(mtx, /*pshared=*/false, /*recursive=*/true);
51}
52
53void mutex_destroy(struct mutex *mtx)
54{
55 CHECK_ERR(pthread_mutex_destroy(&mtx->lock));
56}
57
58void mutex_lock(struct mutex *mtx)
59 NO_THREAD_SAFETY_ANALYSIS
60{
61 CHECK_ERR(pthread_mutex_lock(&mtx->lock));
62}
63
64void mutex_unlock(struct mutex *mtx)
65 NO_THREAD_SAFETY_ANALYSIS
66{
67 CHECK_ERR(pthread_mutex_unlock(&mtx->lock));
68}
69
70bool mutex_trylock(struct mutex *mtx)
71{
72 int ret = pthread_mutex_trylock(&mtx->lock);
73
74 if (ret == 0)
75 return true; /* Lock acquired. */
76
77 if (ret == EBUSY)
78 return false; /* Lock busy. */
79
80 /* Print error. */
81 CHECK_ERR(ret);
82 return false;
83}
84
85static void __cond_init(struct cond *cnd, bool pshared)
86{
87 pthread_condattr_t attr;
88
89 CHECK_ERR(pthread_condattr_init(&attr));
90 if (pshared)
91 CHECK_ERR(pthread_condattr_setpshared(&attr, PTHREAD_PROCESS_SHARED));
92
93 CHECK_ERR(pthread_cond_init(&cnd->cond, &attr));
94 CHECK_ERR(pthread_condattr_destroy(&attr));
95}
96
97void cond_init(struct cond *cnd)
98{
99 __cond_init(cnd, /*pshared=*/false);
100}
101
102void cond_init_pshared(struct cond *cnd)
103{
104 __cond_init(cnd, /*pshared=*/true);
105}
106
107void cond_destroy(struct cond *cnd)
108{
109 CHECK_ERR(pthread_cond_destroy(&cnd->cond));
110}
111
112void cond_wait(struct cond *cnd, struct mutex *mtx)
113{
114 CHECK_ERR(pthread_cond_wait(&cnd->cond, &mtx->lock));
115}
116
117void cond_signal(struct cond *cnd)
118{
119 CHECK_ERR(pthread_cond_signal(&cnd->cond));
120}
121
122void cond_broadcast(struct cond *cnd)
123{
124 CHECK_ERR(pthread_cond_broadcast(&cnd->cond));
125}