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> |
ef635057 | 7 | #include <errno.h> |
07739b57 JA |
8 | #include <pthread.h> |
9 | #include <sys/mman.h> | |
10 | ||
b4c1fb36 | 11 | #include "fio.h" |
4fa6d0f8 | 12 | #include "log.h" |
07739b57 | 13 | #include "mutex.h" |
4d4e80f2 | 14 | #include "arch/arch.h" |
3c2d93ed | 15 | #include "os/os.h" |
3b2e1464 | 16 | #include "helpers.h" |
ef635057 JA |
17 | #include "time.h" |
18 | #include "gettime.h" | |
07739b57 | 19 | |
cdd18ad8 | 20 | void fio_mutex_remove(struct fio_mutex *mutex) |
07739b57 | 21 | { |
58a157d4 | 22 | pthread_cond_destroy(&mutex->cond); |
5921e80c | 23 | munmap((void *) mutex, sizeof(*mutex)); |
07739b57 JA |
24 | } |
25 | ||
cdd18ad8 | 26 | struct fio_mutex *fio_mutex_init(int value) |
07739b57 | 27 | { |
cdd18ad8 | 28 | struct fio_mutex *mutex = NULL; |
07739b57 | 29 | pthread_mutexattr_t attr; |
108fcc11 | 30 | pthread_condattr_t cond; |
e721c57f | 31 | int ret; |
07739b57 | 32 | |
5921e80c | 33 | mutex = (void *) mmap(NULL, sizeof(struct fio_mutex), |
b6f6abc6 JA |
34 | PROT_READ | PROT_WRITE, |
35 | OS_MAP_ANON | MAP_SHARED, -1, 0); | |
cdd18ad8 JA |
36 | if (mutex == MAP_FAILED) { |
37 | perror("mmap mutex"); | |
cdd18ad8 | 38 | mutex = NULL; |
e53bd0b3 | 39 | goto err; |
07739b57 JA |
40 | } |
41 | ||
cdd18ad8 | 42 | mutex->value = value; |
07739b57 | 43 | |
4fa6d0f8 JA |
44 | ret = pthread_mutexattr_init(&attr); |
45 | if (ret) { | |
46 | log_err("pthread_mutexattr_init: %s\n", strerror(ret)); | |
07739b57 JA |
47 | goto err; |
48 | } | |
e721c57f JA |
49 | |
50 | /* | |
51 | * Not all platforms support process shared mutexes (FreeBSD) | |
52 | */ | |
7452440e | 53 | #ifdef FIO_HAVE_PSHARED_MUTEX |
e721c57f | 54 | ret = pthread_mutexattr_setpshared(&attr, PTHREAD_PROCESS_SHARED); |
4fa6d0f8 JA |
55 | if (ret) { |
56 | log_err("pthread_mutexattr_setpshared: %s\n", strerror(ret)); | |
07739b57 JA |
57 | goto err; |
58 | } | |
7452440e | 59 | #endif |
108fcc11 ZY |
60 | |
61 | pthread_condattr_init(&cond); | |
7452440e | 62 | #ifdef FIO_HAVE_PSHARED_MUTEX |
e721c57f | 63 | pthread_condattr_setpshared(&cond, PTHREAD_PROCESS_SHARED); |
ceab2ea2 | 64 | #endif |
58a157d4 | 65 | pthread_cond_init(&mutex->cond, &cond); |
108fcc11 | 66 | |
4fa6d0f8 JA |
67 | ret = pthread_mutex_init(&mutex->lock, &attr); |
68 | if (ret) { | |
69 | log_err("pthread_mutex_init: %s\n", strerror(ret)); | |
07739b57 JA |
70 | goto err; |
71 | } | |
72 | ||
03e20d68 BC |
73 | pthread_condattr_destroy(&cond); |
74 | pthread_mutexattr_destroy(&attr); | |
75 | ||
cdd18ad8 | 76 | return mutex; |
07739b57 | 77 | err: |
cdd18ad8 JA |
78 | if (mutex) |
79 | fio_mutex_remove(mutex); | |
f7c9e00e | 80 | |
07739b57 JA |
81 | return NULL; |
82 | } | |
83 | ||
ef635057 JA |
84 | static int mutex_timed_out(struct timeval *t, unsigned int seconds) |
85 | { | |
86 | return mtime_since_now(t) >= seconds * 1000; | |
87 | } | |
88 | ||
656b1393 JA |
89 | int fio_mutex_down_timeout(struct fio_mutex *mutex, unsigned int seconds) |
90 | { | |
ef635057 | 91 | struct timeval tv_s; |
656b1393 JA |
92 | struct timespec t; |
93 | int ret = 0; | |
94 | ||
b11e4ccf JA |
95 | gettimeofday(&tv_s, NULL); |
96 | t.tv_sec = tv_s.tv_sec + seconds; | |
97 | t.tv_nsec = tv_s.tv_usec * 1000; | |
656b1393 JA |
98 | |
99 | pthread_mutex_lock(&mutex->lock); | |
100 | ||
101 | while (!mutex->value && !ret) { | |
102 | mutex->waiters++; | |
ef635057 JA |
103 | |
104 | /* | |
105 | * Some platforms (FreeBSD 9?) seems to return timed out | |
106 | * way too early, double check. | |
107 | */ | |
656b1393 | 108 | ret = pthread_cond_timedwait(&mutex->cond, &mutex->lock, &t); |
ef635057 JA |
109 | if (ret == ETIMEDOUT && !mutex_timed_out(&tv_s, seconds)) { |
110 | pthread_mutex_lock(&mutex->lock); | |
111 | ret = 0; | |
112 | } | |
113 | ||
656b1393 JA |
114 | mutex->waiters--; |
115 | } | |
116 | ||
117 | if (!ret) { | |
118 | mutex->value--; | |
119 | pthread_mutex_unlock(&mutex->lock); | |
120 | } | |
121 | ||
122 | return ret; | |
123 | } | |
124 | ||
cdd18ad8 | 125 | void fio_mutex_down(struct fio_mutex *mutex) |
07739b57 | 126 | { |
cdd18ad8 | 127 | pthread_mutex_lock(&mutex->lock); |
4d4e80f2 JA |
128 | |
129 | while (!mutex->value) { | |
130 | mutex->waiters++; | |
cdd18ad8 | 131 | pthread_cond_wait(&mutex->cond, &mutex->lock); |
4d4e80f2 JA |
132 | mutex->waiters--; |
133 | } | |
134 | ||
cdd18ad8 JA |
135 | mutex->value--; |
136 | pthread_mutex_unlock(&mutex->lock); | |
07739b57 JA |
137 | } |
138 | ||
cdd18ad8 | 139 | void fio_mutex_up(struct fio_mutex *mutex) |
07739b57 | 140 | { |
cdd18ad8 | 141 | pthread_mutex_lock(&mutex->lock); |
4d4e80f2 JA |
142 | read_barrier(); |
143 | if (!mutex->value && mutex->waiters) | |
cdd18ad8 JA |
144 | pthread_cond_signal(&mutex->cond); |
145 | mutex->value++; | |
146 | pthread_mutex_unlock(&mutex->lock); | |
07739b57 | 147 | } |
64d4d313 JA |
148 | |
149 | void fio_mutex_down_write(struct fio_mutex *mutex) | |
150 | { | |
151 | pthread_mutex_lock(&mutex->lock); | |
4d4e80f2 JA |
152 | |
153 | while (mutex->value != 0) { | |
154 | mutex->waiters++; | |
64d4d313 | 155 | pthread_cond_wait(&mutex->cond, &mutex->lock); |
4d4e80f2 JA |
156 | mutex->waiters--; |
157 | } | |
158 | ||
64d4d313 JA |
159 | mutex->value--; |
160 | pthread_mutex_unlock(&mutex->lock); | |
161 | } | |
162 | ||
163 | void fio_mutex_down_read(struct fio_mutex *mutex) | |
164 | { | |
165 | pthread_mutex_lock(&mutex->lock); | |
4d4e80f2 JA |
166 | |
167 | while (mutex->value < 0) { | |
168 | mutex->waiters++; | |
64d4d313 | 169 | pthread_cond_wait(&mutex->cond, &mutex->lock); |
4d4e80f2 JA |
170 | mutex->waiters--; |
171 | } | |
172 | ||
64d4d313 JA |
173 | mutex->value++; |
174 | pthread_mutex_unlock(&mutex->lock); | |
175 | } | |
176 | ||
177 | void fio_mutex_up_read(struct fio_mutex *mutex) | |
178 | { | |
179 | pthread_mutex_lock(&mutex->lock); | |
180 | mutex->value--; | |
4d4e80f2 JA |
181 | read_barrier(); |
182 | if (mutex->value >= 0 && mutex->waiters) | |
64d4d313 JA |
183 | pthread_cond_signal(&mutex->cond); |
184 | pthread_mutex_unlock(&mutex->lock); | |
185 | } | |
186 | ||
187 | void fio_mutex_up_write(struct fio_mutex *mutex) | |
188 | { | |
189 | pthread_mutex_lock(&mutex->lock); | |
190 | mutex->value++; | |
4d4e80f2 JA |
191 | read_barrier(); |
192 | if (mutex->value >= 0 && mutex->waiters) | |
64d4d313 JA |
193 | pthread_cond_signal(&mutex->cond); |
194 | pthread_mutex_unlock(&mutex->lock); | |
195 | } |