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 | 36 | #ifdef FIO_HAVE_FALLOCATE |
9b836561 | 37 | posix_fallocate(fd, 0, sizeof(struct fio_mutex)); |
3a8600b4 GE |
38 | #endif |
39 | ||
cdd18ad8 JA |
40 | if (ftruncate(fd, sizeof(struct fio_mutex)) < 0) { |
41 | perror("ftruncate mutex"); | |
e53bd0b3 | 42 | goto err; |
07739b57 JA |
43 | } |
44 | ||
5921e80c JA |
45 | mutex = (void *) mmap(NULL, sizeof(struct fio_mutex), |
46 | PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0); | |
cdd18ad8 JA |
47 | if (mutex == MAP_FAILED) { |
48 | perror("mmap mutex"); | |
07739b57 | 49 | close(fd); |
cdd18ad8 | 50 | mutex = NULL; |
e53bd0b3 | 51 | goto err; |
07739b57 JA |
52 | } |
53 | ||
cdd18ad8 JA |
54 | unlink(mutex_name); |
55 | mutex->mutex_fd = fd; | |
56 | mutex->value = value; | |
07739b57 | 57 | |
f356d01d JA |
58 | /* |
59 | * Not all platforms support process shared mutexes (FreeBSD) | |
60 | */ | |
61 | #ifdef FIO_HAVE_PSHARED_MUTEX | |
62 | mflag = PTHREAD_PROCESS_SHARED; | |
63 | #else | |
64 | mflag = PTHREAD_PROCESS_PRIVATE; | |
65 | #endif | |
66 | ||
4fa6d0f8 JA |
67 | ret = pthread_mutexattr_init(&attr); |
68 | if (ret) { | |
69 | log_err("pthread_mutexattr_init: %s\n", strerror(ret)); | |
07739b57 JA |
70 | goto err; |
71 | } | |
7452440e | 72 | #ifdef FIO_HAVE_PSHARED_MUTEX |
f356d01d | 73 | ret = pthread_mutexattr_setpshared(&attr, mflag); |
4fa6d0f8 JA |
74 | if (ret) { |
75 | log_err("pthread_mutexattr_setpshared: %s\n", strerror(ret)); | |
07739b57 JA |
76 | goto err; |
77 | } | |
7452440e | 78 | #endif |
108fcc11 ZY |
79 | |
80 | pthread_condattr_init(&cond); | |
7452440e | 81 | #ifdef FIO_HAVE_PSHARED_MUTEX |
f356d01d | 82 | pthread_condattr_setpshared(&cond, mflag); |
7452440e | 83 | #endif |
cdd18ad8 | 84 | pthread_cond_init(&mutex->cond, &cond); |
108fcc11 | 85 | |
4fa6d0f8 JA |
86 | ret = pthread_mutex_init(&mutex->lock, &attr); |
87 | if (ret) { | |
88 | log_err("pthread_mutex_init: %s\n", strerror(ret)); | |
07739b57 JA |
89 | goto err; |
90 | } | |
91 | ||
03e20d68 BC |
92 | pthread_condattr_destroy(&cond); |
93 | pthread_mutexattr_destroy(&attr); | |
94 | ||
cdd18ad8 | 95 | return mutex; |
07739b57 | 96 | err: |
cdd18ad8 JA |
97 | if (mutex) |
98 | fio_mutex_remove(mutex); | |
f7c9e00e | 99 | |
cdd18ad8 | 100 | unlink(mutex_name); |
07739b57 JA |
101 | return NULL; |
102 | } | |
103 | ||
656b1393 JA |
104 | int fio_mutex_down_timeout(struct fio_mutex *mutex, unsigned int seconds) |
105 | { | |
106 | struct timespec t; | |
107 | int ret = 0; | |
108 | ||
d481e006 | 109 | clock_gettime(CLOCK_REALTIME, &t); |
656b1393 JA |
110 | t.tv_sec += seconds; |
111 | ||
112 | pthread_mutex_lock(&mutex->lock); | |
113 | ||
114 | while (!mutex->value && !ret) { | |
115 | mutex->waiters++; | |
116 | ret = pthread_cond_timedwait(&mutex->cond, &mutex->lock, &t); | |
117 | mutex->waiters--; | |
118 | } | |
119 | ||
120 | if (!ret) { | |
121 | mutex->value--; | |
122 | pthread_mutex_unlock(&mutex->lock); | |
123 | } | |
124 | ||
125 | return ret; | |
126 | } | |
127 | ||
cdd18ad8 | 128 | void fio_mutex_down(struct fio_mutex *mutex) |
07739b57 | 129 | { |
cdd18ad8 | 130 | pthread_mutex_lock(&mutex->lock); |
4d4e80f2 JA |
131 | |
132 | while (!mutex->value) { | |
133 | mutex->waiters++; | |
cdd18ad8 | 134 | pthread_cond_wait(&mutex->cond, &mutex->lock); |
4d4e80f2 JA |
135 | mutex->waiters--; |
136 | } | |
137 | ||
cdd18ad8 JA |
138 | mutex->value--; |
139 | pthread_mutex_unlock(&mutex->lock); | |
07739b57 JA |
140 | } |
141 | ||
cdd18ad8 | 142 | void fio_mutex_up(struct fio_mutex *mutex) |
07739b57 | 143 | { |
cdd18ad8 | 144 | pthread_mutex_lock(&mutex->lock); |
4d4e80f2 JA |
145 | read_barrier(); |
146 | if (!mutex->value && mutex->waiters) | |
cdd18ad8 JA |
147 | pthread_cond_signal(&mutex->cond); |
148 | mutex->value++; | |
149 | pthread_mutex_unlock(&mutex->lock); | |
07739b57 | 150 | } |
64d4d313 JA |
151 | |
152 | void fio_mutex_down_write(struct fio_mutex *mutex) | |
153 | { | |
154 | pthread_mutex_lock(&mutex->lock); | |
4d4e80f2 JA |
155 | |
156 | while (mutex->value != 0) { | |
157 | mutex->waiters++; | |
64d4d313 | 158 | pthread_cond_wait(&mutex->cond, &mutex->lock); |
4d4e80f2 JA |
159 | mutex->waiters--; |
160 | } | |
161 | ||
64d4d313 JA |
162 | mutex->value--; |
163 | pthread_mutex_unlock(&mutex->lock); | |
164 | } | |
165 | ||
166 | void fio_mutex_down_read(struct fio_mutex *mutex) | |
167 | { | |
168 | pthread_mutex_lock(&mutex->lock); | |
4d4e80f2 JA |
169 | |
170 | while (mutex->value < 0) { | |
171 | mutex->waiters++; | |
64d4d313 | 172 | pthread_cond_wait(&mutex->cond, &mutex->lock); |
4d4e80f2 JA |
173 | mutex->waiters--; |
174 | } | |
175 | ||
64d4d313 JA |
176 | mutex->value++; |
177 | pthread_mutex_unlock(&mutex->lock); | |
178 | } | |
179 | ||
180 | void fio_mutex_up_read(struct fio_mutex *mutex) | |
181 | { | |
182 | pthread_mutex_lock(&mutex->lock); | |
183 | mutex->value--; | |
4d4e80f2 JA |
184 | read_barrier(); |
185 | if (mutex->value >= 0 && mutex->waiters) | |
64d4d313 JA |
186 | pthread_cond_signal(&mutex->cond); |
187 | pthread_mutex_unlock(&mutex->lock); | |
188 | } | |
189 | ||
190 | void fio_mutex_up_write(struct fio_mutex *mutex) | |
191 | { | |
192 | pthread_mutex_lock(&mutex->lock); | |
193 | mutex->value++; | |
4d4e80f2 JA |
194 | read_barrier(); |
195 | if (mutex->value >= 0 && mutex->waiters) | |
64d4d313 JA |
196 | pthread_cond_signal(&mutex->cond); |
197 | pthread_mutex_unlock(&mutex->lock); | |
198 | } |