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" |
3b2e1464 | 14 | #include "helpers.h" |
07739b57 | 15 | |
cdd18ad8 | 16 | void fio_mutex_remove(struct fio_mutex *mutex) |
07739b57 | 17 | { |
cdd18ad8 | 18 | close(mutex->mutex_fd); |
5921e80c | 19 | munmap((void *) mutex, sizeof(*mutex)); |
07739b57 JA |
20 | } |
21 | ||
cdd18ad8 | 22 | struct fio_mutex *fio_mutex_init(int value) |
07739b57 | 23 | { |
cdd18ad8 JA |
24 | char mutex_name[] = "/tmp/.fio_mutex.XXXXXX"; |
25 | struct fio_mutex *mutex = NULL; | |
07739b57 | 26 | pthread_mutexattr_t attr; |
108fcc11 | 27 | pthread_condattr_t cond; |
f356d01d | 28 | int fd, ret, mflag; |
07739b57 | 29 | |
cdd18ad8 | 30 | fd = mkstemp(mutex_name); |
07739b57 | 31 | if (fd < 0) { |
cdd18ad8 | 32 | perror("open mutex"); |
07739b57 JA |
33 | return NULL; |
34 | } | |
35 | ||
3a8600b4 GE |
36 | #ifdef FIO_HAVE_FALLOCATE |
37 | ret = posix_fallocate(fd, 0, sizeof(struct fio_mutex)); | |
38 | if (ret > 0) { | |
39 | fprintf(stderr, "posix_fallocate mutex failed: %s\n", strerror(ret)); | |
40 | goto err; | |
41 | } | |
42 | #endif | |
43 | ||
cdd18ad8 JA |
44 | if (ftruncate(fd, sizeof(struct fio_mutex)) < 0) { |
45 | perror("ftruncate mutex"); | |
e53bd0b3 | 46 | goto err; |
07739b57 JA |
47 | } |
48 | ||
5921e80c JA |
49 | mutex = (void *) mmap(NULL, sizeof(struct fio_mutex), |
50 | PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0); | |
cdd18ad8 JA |
51 | if (mutex == MAP_FAILED) { |
52 | perror("mmap mutex"); | |
07739b57 | 53 | close(fd); |
cdd18ad8 | 54 | mutex = NULL; |
e53bd0b3 | 55 | goto err; |
07739b57 JA |
56 | } |
57 | ||
cdd18ad8 JA |
58 | unlink(mutex_name); |
59 | mutex->mutex_fd = fd; | |
60 | mutex->value = value; | |
07739b57 | 61 | |
f356d01d JA |
62 | /* |
63 | * Not all platforms support process shared mutexes (FreeBSD) | |
64 | */ | |
65 | #ifdef FIO_HAVE_PSHARED_MUTEX | |
66 | mflag = PTHREAD_PROCESS_SHARED; | |
67 | #else | |
68 | mflag = PTHREAD_PROCESS_PRIVATE; | |
69 | #endif | |
70 | ||
4fa6d0f8 JA |
71 | ret = pthread_mutexattr_init(&attr); |
72 | if (ret) { | |
73 | log_err("pthread_mutexattr_init: %s\n", strerror(ret)); | |
07739b57 JA |
74 | goto err; |
75 | } | |
7452440e | 76 | #ifdef FIO_HAVE_PSHARED_MUTEX |
f356d01d | 77 | ret = pthread_mutexattr_setpshared(&attr, mflag); |
4fa6d0f8 JA |
78 | if (ret) { |
79 | log_err("pthread_mutexattr_setpshared: %s\n", strerror(ret)); | |
07739b57 JA |
80 | goto err; |
81 | } | |
7452440e | 82 | #endif |
108fcc11 ZY |
83 | |
84 | pthread_condattr_init(&cond); | |
7452440e | 85 | #ifdef FIO_HAVE_PSHARED_MUTEX |
f356d01d | 86 | pthread_condattr_setpshared(&cond, mflag); |
7452440e | 87 | #endif |
cdd18ad8 | 88 | pthread_cond_init(&mutex->cond, &cond); |
108fcc11 | 89 | |
4fa6d0f8 JA |
90 | ret = pthread_mutex_init(&mutex->lock, &attr); |
91 | if (ret) { | |
92 | log_err("pthread_mutex_init: %s\n", strerror(ret)); | |
07739b57 JA |
93 | goto err; |
94 | } | |
95 | ||
03e20d68 BC |
96 | pthread_condattr_destroy(&cond); |
97 | pthread_mutexattr_destroy(&attr); | |
98 | ||
cdd18ad8 | 99 | return mutex; |
07739b57 | 100 | err: |
cdd18ad8 JA |
101 | if (mutex) |
102 | fio_mutex_remove(mutex); | |
f7c9e00e | 103 | |
cdd18ad8 | 104 | unlink(mutex_name); |
07739b57 JA |
105 | return NULL; |
106 | } | |
107 | ||
656b1393 JA |
108 | int fio_mutex_down_timeout(struct fio_mutex *mutex, unsigned int seconds) |
109 | { | |
110 | struct timespec t; | |
111 | int ret = 0; | |
112 | ||
d481e006 | 113 | clock_gettime(CLOCK_REALTIME, &t); |
656b1393 JA |
114 | t.tv_sec += seconds; |
115 | ||
116 | pthread_mutex_lock(&mutex->lock); | |
117 | ||
118 | while (!mutex->value && !ret) { | |
119 | mutex->waiters++; | |
120 | ret = pthread_cond_timedwait(&mutex->cond, &mutex->lock, &t); | |
121 | mutex->waiters--; | |
122 | } | |
123 | ||
124 | if (!ret) { | |
125 | mutex->value--; | |
126 | pthread_mutex_unlock(&mutex->lock); | |
127 | } | |
128 | ||
129 | return ret; | |
130 | } | |
131 | ||
cdd18ad8 | 132 | void fio_mutex_down(struct fio_mutex *mutex) |
07739b57 | 133 | { |
cdd18ad8 | 134 | pthread_mutex_lock(&mutex->lock); |
4d4e80f2 JA |
135 | |
136 | while (!mutex->value) { | |
137 | mutex->waiters++; | |
cdd18ad8 | 138 | pthread_cond_wait(&mutex->cond, &mutex->lock); |
4d4e80f2 JA |
139 | mutex->waiters--; |
140 | } | |
141 | ||
cdd18ad8 JA |
142 | mutex->value--; |
143 | pthread_mutex_unlock(&mutex->lock); | |
07739b57 JA |
144 | } |
145 | ||
cdd18ad8 | 146 | void fio_mutex_up(struct fio_mutex *mutex) |
07739b57 | 147 | { |
cdd18ad8 | 148 | pthread_mutex_lock(&mutex->lock); |
4d4e80f2 JA |
149 | read_barrier(); |
150 | if (!mutex->value && mutex->waiters) | |
cdd18ad8 JA |
151 | pthread_cond_signal(&mutex->cond); |
152 | mutex->value++; | |
153 | pthread_mutex_unlock(&mutex->lock); | |
07739b57 | 154 | } |
64d4d313 JA |
155 | |
156 | void fio_mutex_down_write(struct fio_mutex *mutex) | |
157 | { | |
158 | pthread_mutex_lock(&mutex->lock); | |
4d4e80f2 JA |
159 | |
160 | while (mutex->value != 0) { | |
161 | mutex->waiters++; | |
64d4d313 | 162 | pthread_cond_wait(&mutex->cond, &mutex->lock); |
4d4e80f2 JA |
163 | mutex->waiters--; |
164 | } | |
165 | ||
64d4d313 JA |
166 | mutex->value--; |
167 | pthread_mutex_unlock(&mutex->lock); | |
168 | } | |
169 | ||
170 | void fio_mutex_down_read(struct fio_mutex *mutex) | |
171 | { | |
172 | pthread_mutex_lock(&mutex->lock); | |
4d4e80f2 JA |
173 | |
174 | while (mutex->value < 0) { | |
175 | mutex->waiters++; | |
64d4d313 | 176 | pthread_cond_wait(&mutex->cond, &mutex->lock); |
4d4e80f2 JA |
177 | mutex->waiters--; |
178 | } | |
179 | ||
64d4d313 JA |
180 | mutex->value++; |
181 | pthread_mutex_unlock(&mutex->lock); | |
182 | } | |
183 | ||
184 | void fio_mutex_up_read(struct fio_mutex *mutex) | |
185 | { | |
186 | pthread_mutex_lock(&mutex->lock); | |
187 | mutex->value--; | |
4d4e80f2 JA |
188 | read_barrier(); |
189 | if (mutex->value >= 0 && mutex->waiters) | |
64d4d313 JA |
190 | pthread_cond_signal(&mutex->cond); |
191 | pthread_mutex_unlock(&mutex->lock); | |
192 | } | |
193 | ||
194 | void fio_mutex_up_write(struct fio_mutex *mutex) | |
195 | { | |
196 | pthread_mutex_lock(&mutex->lock); | |
197 | mutex->value++; | |
4d4e80f2 JA |
198 | read_barrier(); |
199 | if (mutex->value >= 0 && mutex->waiters) | |
64d4d313 JA |
200 | pthread_cond_signal(&mutex->cond); |
201 | pthread_mutex_unlock(&mutex->lock); | |
202 | } |