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" |
3c2d93ed | 12 | #include "os/os.h" |
07739b57 | 13 | |
cdd18ad8 | 14 | void fio_mutex_remove(struct fio_mutex *mutex) |
07739b57 | 15 | { |
cdd18ad8 | 16 | close(mutex->mutex_fd); |
5921e80c | 17 | munmap((void *) mutex, sizeof(*mutex)); |
07739b57 JA |
18 | } |
19 | ||
cdd18ad8 | 20 | struct fio_mutex *fio_mutex_init(int value) |
07739b57 | 21 | { |
cdd18ad8 JA |
22 | char mutex_name[] = "/tmp/.fio_mutex.XXXXXX"; |
23 | struct fio_mutex *mutex = NULL; | |
07739b57 | 24 | pthread_mutexattr_t attr; |
108fcc11 | 25 | pthread_condattr_t cond; |
f356d01d | 26 | int fd, ret, mflag; |
07739b57 | 27 | |
cdd18ad8 | 28 | fd = mkstemp(mutex_name); |
07739b57 | 29 | if (fd < 0) { |
cdd18ad8 | 30 | perror("open mutex"); |
07739b57 JA |
31 | return NULL; |
32 | } | |
33 | ||
cdd18ad8 JA |
34 | if (ftruncate(fd, sizeof(struct fio_mutex)) < 0) { |
35 | perror("ftruncate mutex"); | |
e53bd0b3 | 36 | goto err; |
07739b57 JA |
37 | } |
38 | ||
5921e80c JA |
39 | mutex = (void *) mmap(NULL, sizeof(struct fio_mutex), |
40 | PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0); | |
cdd18ad8 JA |
41 | if (mutex == MAP_FAILED) { |
42 | perror("mmap mutex"); | |
07739b57 | 43 | close(fd); |
cdd18ad8 | 44 | mutex = NULL; |
e53bd0b3 | 45 | goto err; |
07739b57 JA |
46 | } |
47 | ||
cdd18ad8 JA |
48 | unlink(mutex_name); |
49 | mutex->mutex_fd = fd; | |
50 | mutex->value = value; | |
07739b57 | 51 | |
f356d01d JA |
52 | /* |
53 | * Not all platforms support process shared mutexes (FreeBSD) | |
54 | */ | |
55 | #ifdef FIO_HAVE_PSHARED_MUTEX | |
56 | mflag = PTHREAD_PROCESS_SHARED; | |
57 | #else | |
58 | mflag = PTHREAD_PROCESS_PRIVATE; | |
59 | #endif | |
60 | ||
4fa6d0f8 JA |
61 | ret = pthread_mutexattr_init(&attr); |
62 | if (ret) { | |
63 | log_err("pthread_mutexattr_init: %s\n", strerror(ret)); | |
07739b57 JA |
64 | goto err; |
65 | } | |
f356d01d | 66 | ret = pthread_mutexattr_setpshared(&attr, mflag); |
4fa6d0f8 JA |
67 | if (ret) { |
68 | log_err("pthread_mutexattr_setpshared: %s\n", strerror(ret)); | |
07739b57 JA |
69 | goto err; |
70 | } | |
108fcc11 ZY |
71 | |
72 | pthread_condattr_init(&cond); | |
f356d01d | 73 | pthread_condattr_setpshared(&cond, mflag); |
cdd18ad8 | 74 | pthread_cond_init(&mutex->cond, &cond); |
108fcc11 | 75 | |
4fa6d0f8 JA |
76 | ret = pthread_mutex_init(&mutex->lock, &attr); |
77 | if (ret) { | |
78 | log_err("pthread_mutex_init: %s\n", strerror(ret)); | |
07739b57 JA |
79 | goto err; |
80 | } | |
81 | ||
cdd18ad8 | 82 | return mutex; |
07739b57 | 83 | err: |
cdd18ad8 JA |
84 | if (mutex) |
85 | fio_mutex_remove(mutex); | |
f7c9e00e | 86 | |
cdd18ad8 | 87 | unlink(mutex_name); |
07739b57 JA |
88 | return NULL; |
89 | } | |
90 | ||
cdd18ad8 | 91 | void fio_mutex_down(struct fio_mutex *mutex) |
07739b57 | 92 | { |
cdd18ad8 | 93 | pthread_mutex_lock(&mutex->lock); |
4d4e80f2 JA |
94 | |
95 | while (!mutex->value) { | |
96 | mutex->waiters++; | |
cdd18ad8 | 97 | pthread_cond_wait(&mutex->cond, &mutex->lock); |
4d4e80f2 JA |
98 | mutex->waiters--; |
99 | } | |
100 | ||
cdd18ad8 JA |
101 | mutex->value--; |
102 | pthread_mutex_unlock(&mutex->lock); | |
07739b57 JA |
103 | } |
104 | ||
cdd18ad8 | 105 | void fio_mutex_up(struct fio_mutex *mutex) |
07739b57 | 106 | { |
cdd18ad8 | 107 | pthread_mutex_lock(&mutex->lock); |
4d4e80f2 JA |
108 | read_barrier(); |
109 | if (!mutex->value && mutex->waiters) | |
cdd18ad8 JA |
110 | pthread_cond_signal(&mutex->cond); |
111 | mutex->value++; | |
112 | pthread_mutex_unlock(&mutex->lock); | |
07739b57 | 113 | } |
64d4d313 JA |
114 | |
115 | void fio_mutex_down_write(struct fio_mutex *mutex) | |
116 | { | |
117 | pthread_mutex_lock(&mutex->lock); | |
4d4e80f2 JA |
118 | |
119 | while (mutex->value != 0) { | |
120 | mutex->waiters++; | |
64d4d313 | 121 | pthread_cond_wait(&mutex->cond, &mutex->lock); |
4d4e80f2 JA |
122 | mutex->waiters--; |
123 | } | |
124 | ||
64d4d313 JA |
125 | mutex->value--; |
126 | pthread_mutex_unlock(&mutex->lock); | |
127 | } | |
128 | ||
129 | void fio_mutex_down_read(struct fio_mutex *mutex) | |
130 | { | |
131 | pthread_mutex_lock(&mutex->lock); | |
4d4e80f2 JA |
132 | |
133 | while (mutex->value < 0) { | |
134 | mutex->waiters++; | |
64d4d313 | 135 | pthread_cond_wait(&mutex->cond, &mutex->lock); |
4d4e80f2 JA |
136 | mutex->waiters--; |
137 | } | |
138 | ||
64d4d313 JA |
139 | mutex->value++; |
140 | pthread_mutex_unlock(&mutex->lock); | |
141 | } | |
142 | ||
143 | void fio_mutex_up_read(struct fio_mutex *mutex) | |
144 | { | |
145 | pthread_mutex_lock(&mutex->lock); | |
146 | mutex->value--; | |
4d4e80f2 JA |
147 | read_barrier(); |
148 | if (mutex->value >= 0 && mutex->waiters) | |
64d4d313 JA |
149 | pthread_cond_signal(&mutex->cond); |
150 | pthread_mutex_unlock(&mutex->lock); | |
151 | } | |
152 | ||
153 | void fio_mutex_up_write(struct fio_mutex *mutex) | |
154 | { | |
155 | pthread_mutex_lock(&mutex->lock); | |
156 | mutex->value++; | |
4d4e80f2 JA |
157 | read_barrier(); |
158 | if (mutex->value >= 0 && mutex->waiters) | |
64d4d313 JA |
159 | pthread_cond_signal(&mutex->cond); |
160 | pthread_mutex_unlock(&mutex->lock); | |
161 | } |