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