Commit | Line | Data |
---|---|---|
07739b57 JA |
1 | #include <stdio.h> |
2 | #include <string.h> | |
3 | #include <unistd.h> | |
4 | #include <stdlib.h> | |
5 | #include <fcntl.h> | |
656b1393 | 6 | #include <time.h> |
07739b57 JA |
7 | #include <pthread.h> |
8 | #include <sys/mman.h> | |
9 | ||
4fa6d0f8 | 10 | #include "log.h" |
07739b57 | 11 | #include "mutex.h" |
4d4e80f2 | 12 | #include "arch/arch.h" |
3c2d93ed | 13 | #include "os/os.h" |
07739b57 | 14 | |
cdd18ad8 | 15 | void fio_mutex_remove(struct fio_mutex *mutex) |
07739b57 | 16 | { |
cdd18ad8 | 17 | close(mutex->mutex_fd); |
5921e80c | 18 | munmap((void *) mutex, sizeof(*mutex)); |
07739b57 JA |
19 | } |
20 | ||
cdd18ad8 | 21 | struct fio_mutex *fio_mutex_init(int value) |
07739b57 | 22 | { |
cdd18ad8 JA |
23 | char mutex_name[] = "/tmp/.fio_mutex.XXXXXX"; |
24 | struct fio_mutex *mutex = NULL; | |
07739b57 | 25 | pthread_mutexattr_t attr; |
108fcc11 | 26 | pthread_condattr_t cond; |
f356d01d | 27 | int fd, ret, mflag; |
07739b57 | 28 | |
cdd18ad8 | 29 | fd = mkstemp(mutex_name); |
07739b57 | 30 | if (fd < 0) { |
cdd18ad8 | 31 | perror("open mutex"); |
07739b57 JA |
32 | return NULL; |
33 | } | |
34 | ||
cdd18ad8 JA |
35 | if (ftruncate(fd, sizeof(struct fio_mutex)) < 0) { |
36 | perror("ftruncate mutex"); | |
e53bd0b3 | 37 | goto err; |
07739b57 JA |
38 | } |
39 | ||
5921e80c JA |
40 | mutex = (void *) mmap(NULL, sizeof(struct fio_mutex), |
41 | PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0); | |
cdd18ad8 JA |
42 | if (mutex == MAP_FAILED) { |
43 | perror("mmap mutex"); | |
07739b57 | 44 | close(fd); |
cdd18ad8 | 45 | mutex = NULL; |
e53bd0b3 | 46 | goto err; |
07739b57 JA |
47 | } |
48 | ||
cdd18ad8 JA |
49 | unlink(mutex_name); |
50 | mutex->mutex_fd = fd; | |
51 | mutex->value = value; | |
07739b57 | 52 | |
f356d01d JA |
53 | /* |
54 | * Not all platforms support process shared mutexes (FreeBSD) | |
55 | */ | |
56 | #ifdef FIO_HAVE_PSHARED_MUTEX | |
57 | mflag = PTHREAD_PROCESS_SHARED; | |
58 | #else | |
59 | mflag = PTHREAD_PROCESS_PRIVATE; | |
60 | #endif | |
61 | ||
4fa6d0f8 JA |
62 | ret = pthread_mutexattr_init(&attr); |
63 | if (ret) { | |
64 | log_err("pthread_mutexattr_init: %s\n", strerror(ret)); | |
07739b57 JA |
65 | goto err; |
66 | } | |
f356d01d | 67 | ret = pthread_mutexattr_setpshared(&attr, mflag); |
4fa6d0f8 JA |
68 | if (ret) { |
69 | log_err("pthread_mutexattr_setpshared: %s\n", strerror(ret)); | |
07739b57 JA |
70 | goto err; |
71 | } | |
108fcc11 ZY |
72 | |
73 | pthread_condattr_init(&cond); | |
f356d01d | 74 | pthread_condattr_setpshared(&cond, mflag); |
cdd18ad8 | 75 | pthread_cond_init(&mutex->cond, &cond); |
108fcc11 | 76 | |
4fa6d0f8 JA |
77 | ret = pthread_mutex_init(&mutex->lock, &attr); |
78 | if (ret) { | |
79 | log_err("pthread_mutex_init: %s\n", strerror(ret)); | |
07739b57 JA |
80 | goto err; |
81 | } | |
82 | ||
cdd18ad8 | 83 | return mutex; |
07739b57 | 84 | err: |
cdd18ad8 JA |
85 | if (mutex) |
86 | fio_mutex_remove(mutex); | |
f7c9e00e | 87 | |
cdd18ad8 | 88 | unlink(mutex_name); |
07739b57 JA |
89 | return NULL; |
90 | } | |
91 | ||
656b1393 JA |
92 | int fio_mutex_down_timeout(struct fio_mutex *mutex, unsigned int seconds) |
93 | { | |
94 | struct timespec t; | |
95 | int ret = 0; | |
96 | ||
69a852f5 | 97 | clock_gettime(CLOCK_MONOTONIC, &t); |
656b1393 JA |
98 | t.tv_sec += seconds; |
99 | ||
100 | pthread_mutex_lock(&mutex->lock); | |
101 | ||
102 | while (!mutex->value && !ret) { | |
103 | mutex->waiters++; | |
104 | ret = pthread_cond_timedwait(&mutex->cond, &mutex->lock, &t); | |
105 | mutex->waiters--; | |
106 | } | |
107 | ||
108 | if (!ret) { | |
109 | mutex->value--; | |
110 | pthread_mutex_unlock(&mutex->lock); | |
111 | } | |
112 | ||
113 | return ret; | |
114 | } | |
115 | ||
cdd18ad8 | 116 | void fio_mutex_down(struct fio_mutex *mutex) |
07739b57 | 117 | { |
cdd18ad8 | 118 | pthread_mutex_lock(&mutex->lock); |
4d4e80f2 JA |
119 | |
120 | while (!mutex->value) { | |
121 | mutex->waiters++; | |
cdd18ad8 | 122 | pthread_cond_wait(&mutex->cond, &mutex->lock); |
4d4e80f2 JA |
123 | mutex->waiters--; |
124 | } | |
125 | ||
cdd18ad8 JA |
126 | mutex->value--; |
127 | pthread_mutex_unlock(&mutex->lock); | |
07739b57 JA |
128 | } |
129 | ||
cdd18ad8 | 130 | void fio_mutex_up(struct fio_mutex *mutex) |
07739b57 | 131 | { |
cdd18ad8 | 132 | pthread_mutex_lock(&mutex->lock); |
4d4e80f2 JA |
133 | read_barrier(); |
134 | if (!mutex->value && mutex->waiters) | |
cdd18ad8 JA |
135 | pthread_cond_signal(&mutex->cond); |
136 | mutex->value++; | |
137 | pthread_mutex_unlock(&mutex->lock); | |
07739b57 | 138 | } |
64d4d313 JA |
139 | |
140 | void fio_mutex_down_write(struct fio_mutex *mutex) | |
141 | { | |
142 | pthread_mutex_lock(&mutex->lock); | |
4d4e80f2 JA |
143 | |
144 | while (mutex->value != 0) { | |
145 | mutex->waiters++; | |
64d4d313 | 146 | pthread_cond_wait(&mutex->cond, &mutex->lock); |
4d4e80f2 JA |
147 | mutex->waiters--; |
148 | } | |
149 | ||
64d4d313 JA |
150 | mutex->value--; |
151 | pthread_mutex_unlock(&mutex->lock); | |
152 | } | |
153 | ||
154 | void fio_mutex_down_read(struct fio_mutex *mutex) | |
155 | { | |
156 | pthread_mutex_lock(&mutex->lock); | |
4d4e80f2 JA |
157 | |
158 | while (mutex->value < 0) { | |
159 | mutex->waiters++; | |
64d4d313 | 160 | pthread_cond_wait(&mutex->cond, &mutex->lock); |
4d4e80f2 JA |
161 | mutex->waiters--; |
162 | } | |
163 | ||
64d4d313 JA |
164 | mutex->value++; |
165 | pthread_mutex_unlock(&mutex->lock); | |
166 | } | |
167 | ||
168 | void fio_mutex_up_read(struct fio_mutex *mutex) | |
169 | { | |
170 | pthread_mutex_lock(&mutex->lock); | |
171 | mutex->value--; | |
4d4e80f2 JA |
172 | read_barrier(); |
173 | if (mutex->value >= 0 && mutex->waiters) | |
64d4d313 JA |
174 | pthread_cond_signal(&mutex->cond); |
175 | pthread_mutex_unlock(&mutex->lock); | |
176 | } | |
177 | ||
178 | void fio_mutex_up_write(struct fio_mutex *mutex) | |
179 | { | |
180 | pthread_mutex_lock(&mutex->lock); | |
181 | mutex->value++; | |
4d4e80f2 JA |
182 | read_barrier(); |
183 | if (mutex->value >= 0 && mutex->waiters) | |
64d4d313 JA |
184 | pthread_cond_signal(&mutex->cond); |
185 | pthread_mutex_unlock(&mutex->lock); | |
186 | } |