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 | ||
9 | #include "mutex.h" | |
10 | ||
cdd18ad8 | 11 | void fio_mutex_remove(struct fio_mutex *mutex) |
07739b57 | 12 | { |
cdd18ad8 JA |
13 | close(mutex->mutex_fd); |
14 | munmap(mutex, sizeof(*mutex)); | |
07739b57 JA |
15 | } |
16 | ||
cdd18ad8 | 17 | struct fio_mutex *fio_mutex_init(int value) |
07739b57 | 18 | { |
cdd18ad8 JA |
19 | char mutex_name[] = "/tmp/.fio_mutex.XXXXXX"; |
20 | struct fio_mutex *mutex = NULL; | |
07739b57 | 21 | pthread_mutexattr_t attr; |
108fcc11 | 22 | pthread_condattr_t cond; |
07739b57 JA |
23 | int fd; |
24 | ||
cdd18ad8 | 25 | fd = mkstemp(mutex_name); |
07739b57 | 26 | if (fd < 0) { |
cdd18ad8 | 27 | perror("open mutex"); |
07739b57 JA |
28 | return NULL; |
29 | } | |
30 | ||
cdd18ad8 JA |
31 | if (ftruncate(fd, sizeof(struct fio_mutex)) < 0) { |
32 | perror("ftruncate mutex"); | |
e53bd0b3 | 33 | goto err; |
07739b57 JA |
34 | } |
35 | ||
cdd18ad8 | 36 | mutex = mmap(NULL, sizeof(struct fio_mutex), PROT_READ | PROT_WRITE, |
07739b57 | 37 | MAP_SHARED, fd, 0); |
cdd18ad8 JA |
38 | if (mutex == MAP_FAILED) { |
39 | perror("mmap mutex"); | |
07739b57 | 40 | close(fd); |
cdd18ad8 | 41 | mutex = NULL; |
e53bd0b3 | 42 | goto err; |
07739b57 JA |
43 | } |
44 | ||
cdd18ad8 JA |
45 | unlink(mutex_name); |
46 | mutex->mutex_fd = fd; | |
47 | mutex->value = value; | |
07739b57 JA |
48 | |
49 | if (pthread_mutexattr_init(&attr)) { | |
50 | perror("pthread_mutexattr_init"); | |
51 | goto err; | |
52 | } | |
53 | if (pthread_mutexattr_setpshared(&attr, PTHREAD_PROCESS_SHARED)) { | |
54 | perror("pthread_mutexattr_setpshared"); | |
55 | goto err; | |
56 | } | |
108fcc11 ZY |
57 | |
58 | pthread_condattr_init(&cond); | |
59 | pthread_condattr_setpshared(&cond, PTHREAD_PROCESS_SHARED); | |
cdd18ad8 | 60 | pthread_cond_init(&mutex->cond, &cond); |
108fcc11 | 61 | |
cdd18ad8 | 62 | if (pthread_mutex_init(&mutex->lock, &attr)) { |
07739b57 JA |
63 | perror("pthread_mutex_init"); |
64 | goto err; | |
65 | } | |
66 | ||
cdd18ad8 | 67 | return mutex; |
07739b57 | 68 | err: |
cdd18ad8 JA |
69 | if (mutex) |
70 | fio_mutex_remove(mutex); | |
f7c9e00e | 71 | |
cdd18ad8 | 72 | unlink(mutex_name); |
07739b57 JA |
73 | return NULL; |
74 | } | |
75 | ||
cdd18ad8 | 76 | void fio_mutex_down(struct fio_mutex *mutex) |
07739b57 | 77 | { |
cdd18ad8 JA |
78 | pthread_mutex_lock(&mutex->lock); |
79 | while (mutex->value == 0) | |
80 | pthread_cond_wait(&mutex->cond, &mutex->lock); | |
81 | mutex->value--; | |
82 | pthread_mutex_unlock(&mutex->lock); | |
07739b57 JA |
83 | } |
84 | ||
cdd18ad8 | 85 | void fio_mutex_up(struct fio_mutex *mutex) |
07739b57 | 86 | { |
cdd18ad8 JA |
87 | pthread_mutex_lock(&mutex->lock); |
88 | if (!mutex->value) | |
89 | pthread_cond_signal(&mutex->cond); | |
90 | mutex->value++; | |
91 | pthread_mutex_unlock(&mutex->lock); | |
07739b57 | 92 | } |