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e57d8977 PG |
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 | ||
8 | static 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 | ||
20 | static void __mutex_init(struct mutex *mtx, bool pshared) | |
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 (pshared) | |
31 | CHECK_ERR(pthread_mutexattr_setpshared(&attr, PTHREAD_PROCESS_SHARED)); | |
32 | ||
33 | CHECK_ERR(pthread_mutex_init(&mtx->lock, &attr)); | |
34 | CHECK_ERR(pthread_mutexattr_destroy(&attr)); | |
35 | } | |
36 | ||
37 | void mutex_init(struct mutex *mtx) | |
38 | { | |
39 | __mutex_init(mtx, /*pshared=*/false); | |
40 | } | |
41 | ||
42 | void mutex_init_pshared(struct mutex *mtx) | |
43 | { | |
44 | __mutex_init(mtx, /*pshared=*/true); | |
45 | } | |
46 | ||
47 | void mutex_destroy(struct mutex *mtx) | |
48 | { | |
49 | CHECK_ERR(pthread_mutex_destroy(&mtx->lock)); | |
50 | } | |
51 | ||
52 | void mutex_lock(struct mutex *mtx) | |
bfa339ce | 53 | NO_THREAD_SAFETY_ANALYSIS |
e57d8977 PG |
54 | { |
55 | CHECK_ERR(pthread_mutex_lock(&mtx->lock)); | |
56 | } | |
57 | ||
58 | void mutex_unlock(struct mutex *mtx) | |
bfa339ce | 59 | NO_THREAD_SAFETY_ANALYSIS |
e57d8977 PG |
60 | { |
61 | CHECK_ERR(pthread_mutex_unlock(&mtx->lock)); | |
62 | } | |
63 | ||
64 | bool mutex_trylock(struct mutex *mtx) | |
65 | { | |
66 | int ret = pthread_mutex_trylock(&mtx->lock); | |
67 | ||
68 | if (ret == 0) | |
69 | return true; /* Lock acquired. */ | |
70 | ||
71 | if (ret == EBUSY) | |
72 | return false; /* Lock busy. */ | |
73 | ||
74 | /* Print error. */ | |
75 | CHECK_ERR(ret); | |
76 | return false; | |
77 | } | |
78 | ||
79 | static void __cond_init(struct cond *cnd, bool pshared) | |
80 | { | |
81 | pthread_condattr_t attr; | |
82 | ||
83 | CHECK_ERR(pthread_condattr_init(&attr)); | |
84 | if (pshared) | |
85 | CHECK_ERR(pthread_condattr_setpshared(&attr, PTHREAD_PROCESS_SHARED)); | |
86 | ||
87 | CHECK_ERR(pthread_cond_init(&cnd->cond, &attr)); | |
88 | CHECK_ERR(pthread_condattr_destroy(&attr)); | |
89 | } | |
90 | ||
91 | void cond_init(struct cond *cnd) | |
92 | { | |
93 | __cond_init(cnd, /*pshared=*/false); | |
94 | } | |
95 | ||
96 | void cond_init_pshared(struct cond *cnd) | |
97 | { | |
98 | __cond_init(cnd, /*pshared=*/true); | |
99 | } | |
100 | ||
101 | void cond_destroy(struct cond *cnd) | |
102 | { | |
103 | CHECK_ERR(pthread_cond_destroy(&cnd->cond)); | |
104 | } | |
105 | ||
106 | void cond_wait(struct cond *cnd, struct mutex *mtx) | |
107 | { | |
108 | CHECK_ERR(pthread_cond_wait(&cnd->cond, &mtx->lock)); | |
109 | } | |
110 | ||
111 | void cond_signal(struct cond *cnd) | |
112 | { | |
113 | CHECK_ERR(pthread_cond_signal(&cnd->cond)); | |
114 | } | |
115 | ||
116 | void cond_broadcast(struct cond *cnd) | |
117 | { | |
118 | CHECK_ERR(pthread_cond_broadcast(&cnd->cond)); | |
119 | } |