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