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 | ||
cdd18ad8 | 96 | return mutex; |
07739b57 | 97 | err: |
cdd18ad8 JA |
98 | if (mutex) |
99 | fio_mutex_remove(mutex); | |
f7c9e00e | 100 | |
cdd18ad8 | 101 | unlink(mutex_name); |
07739b57 JA |
102 | return NULL; |
103 | } | |
104 | ||
656b1393 JA |
105 | int fio_mutex_down_timeout(struct fio_mutex *mutex, unsigned int seconds) |
106 | { | |
107 | struct timespec t; | |
108 | int ret = 0; | |
109 | ||
d481e006 | 110 | clock_gettime(CLOCK_REALTIME, &t); |
656b1393 JA |
111 | t.tv_sec += seconds; |
112 | ||
113 | pthread_mutex_lock(&mutex->lock); | |
114 | ||
115 | while (!mutex->value && !ret) { | |
116 | mutex->waiters++; | |
117 | ret = pthread_cond_timedwait(&mutex->cond, &mutex->lock, &t); | |
118 | mutex->waiters--; | |
119 | } | |
120 | ||
121 | if (!ret) { | |
122 | mutex->value--; | |
123 | pthread_mutex_unlock(&mutex->lock); | |
124 | } | |
125 | ||
126 | return ret; | |
127 | } | |
128 | ||
cdd18ad8 | 129 | void fio_mutex_down(struct fio_mutex *mutex) |
07739b57 | 130 | { |
cdd18ad8 | 131 | pthread_mutex_lock(&mutex->lock); |
4d4e80f2 JA |
132 | |
133 | while (!mutex->value) { | |
134 | mutex->waiters++; | |
cdd18ad8 | 135 | pthread_cond_wait(&mutex->cond, &mutex->lock); |
4d4e80f2 JA |
136 | mutex->waiters--; |
137 | } | |
138 | ||
cdd18ad8 JA |
139 | mutex->value--; |
140 | pthread_mutex_unlock(&mutex->lock); | |
07739b57 JA |
141 | } |
142 | ||
cdd18ad8 | 143 | void fio_mutex_up(struct fio_mutex *mutex) |
07739b57 | 144 | { |
cdd18ad8 | 145 | pthread_mutex_lock(&mutex->lock); |
4d4e80f2 JA |
146 | read_barrier(); |
147 | if (!mutex->value && mutex->waiters) | |
cdd18ad8 JA |
148 | pthread_cond_signal(&mutex->cond); |
149 | mutex->value++; | |
150 | pthread_mutex_unlock(&mutex->lock); | |
07739b57 | 151 | } |
64d4d313 JA |
152 | |
153 | void fio_mutex_down_write(struct fio_mutex *mutex) | |
154 | { | |
155 | pthread_mutex_lock(&mutex->lock); | |
4d4e80f2 JA |
156 | |
157 | while (mutex->value != 0) { | |
158 | mutex->waiters++; | |
64d4d313 | 159 | pthread_cond_wait(&mutex->cond, &mutex->lock); |
4d4e80f2 JA |
160 | mutex->waiters--; |
161 | } | |
162 | ||
64d4d313 JA |
163 | mutex->value--; |
164 | pthread_mutex_unlock(&mutex->lock); | |
165 | } | |
166 | ||
167 | void fio_mutex_down_read(struct fio_mutex *mutex) | |
168 | { | |
169 | pthread_mutex_lock(&mutex->lock); | |
4d4e80f2 JA |
170 | |
171 | while (mutex->value < 0) { | |
172 | mutex->waiters++; | |
64d4d313 | 173 | pthread_cond_wait(&mutex->cond, &mutex->lock); |
4d4e80f2 JA |
174 | mutex->waiters--; |
175 | } | |
176 | ||
64d4d313 JA |
177 | mutex->value++; |
178 | pthread_mutex_unlock(&mutex->lock); | |
179 | } | |
180 | ||
181 | void fio_mutex_up_read(struct fio_mutex *mutex) | |
182 | { | |
183 | pthread_mutex_lock(&mutex->lock); | |
184 | mutex->value--; | |
4d4e80f2 JA |
185 | read_barrier(); |
186 | if (mutex->value >= 0 && mutex->waiters) | |
64d4d313 JA |
187 | pthread_cond_signal(&mutex->cond); |
188 | pthread_mutex_unlock(&mutex->lock); | |
189 | } | |
190 | ||
191 | void fio_mutex_up_write(struct fio_mutex *mutex) | |
192 | { | |
193 | pthread_mutex_lock(&mutex->lock); | |
194 | mutex->value++; | |
4d4e80f2 JA |
195 | read_barrier(); |
196 | if (mutex->value >= 0 && mutex->waiters) | |
64d4d313 JA |
197 | pthread_cond_signal(&mutex->cond); |
198 | pthread_mutex_unlock(&mutex->lock); | |
199 | } |