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 | |
b4c1fb36 JA |
20 | static clockid_t fio_clk_id = CLOCK_REALTIME; |
21 | ||
cdd18ad8 | 22 | void fio_mutex_remove(struct fio_mutex *mutex) |
07739b57 | 23 | { |
58a157d4 | 24 | pthread_cond_destroy(&mutex->cond); |
5921e80c | 25 | munmap((void *) mutex, sizeof(*mutex)); |
07739b57 JA |
26 | } |
27 | ||
cdd18ad8 | 28 | struct fio_mutex *fio_mutex_init(int value) |
07739b57 | 29 | { |
cdd18ad8 | 30 | struct fio_mutex *mutex = NULL; |
07739b57 | 31 | pthread_mutexattr_t attr; |
108fcc11 | 32 | pthread_condattr_t cond; |
e721c57f | 33 | int ret; |
07739b57 | 34 | |
5921e80c | 35 | mutex = (void *) mmap(NULL, sizeof(struct fio_mutex), |
b6f6abc6 JA |
36 | PROT_READ | PROT_WRITE, |
37 | OS_MAP_ANON | MAP_SHARED, -1, 0); | |
cdd18ad8 JA |
38 | if (mutex == MAP_FAILED) { |
39 | perror("mmap mutex"); | |
cdd18ad8 | 40 | mutex = NULL; |
e53bd0b3 | 41 | goto err; |
07739b57 JA |
42 | } |
43 | ||
cdd18ad8 | 44 | mutex->value = value; |
07739b57 | 45 | |
4fa6d0f8 JA |
46 | ret = pthread_mutexattr_init(&attr); |
47 | if (ret) { | |
48 | log_err("pthread_mutexattr_init: %s\n", strerror(ret)); | |
07739b57 JA |
49 | goto err; |
50 | } | |
e721c57f JA |
51 | |
52 | /* | |
53 | * Not all platforms support process shared mutexes (FreeBSD) | |
54 | */ | |
7452440e | 55 | #ifdef FIO_HAVE_PSHARED_MUTEX |
e721c57f | 56 | ret = pthread_mutexattr_setpshared(&attr, PTHREAD_PROCESS_SHARED); |
4fa6d0f8 JA |
57 | if (ret) { |
58 | log_err("pthread_mutexattr_setpshared: %s\n", strerror(ret)); | |
07739b57 JA |
59 | goto err; |
60 | } | |
7452440e | 61 | #endif |
108fcc11 ZY |
62 | |
63 | pthread_condattr_init(&cond); | |
7452440e | 64 | #ifdef FIO_HAVE_PSHARED_MUTEX |
e721c57f | 65 | pthread_condattr_setpshared(&cond, PTHREAD_PROCESS_SHARED); |
7452440e | 66 | #endif |
ceab2ea2 | 67 | #ifdef FIO_HAVE_CLOCK_MONOTONIC |
b4c1fb36 | 68 | pthread_condattr_setclock(&cond, fio_clk_id); |
ceab2ea2 | 69 | #endif |
58a157d4 | 70 | pthread_cond_init(&mutex->cond, &cond); |
108fcc11 | 71 | |
4fa6d0f8 JA |
72 | ret = pthread_mutex_init(&mutex->lock, &attr); |
73 | if (ret) { | |
74 | log_err("pthread_mutex_init: %s\n", strerror(ret)); | |
07739b57 JA |
75 | goto err; |
76 | } | |
77 | ||
03e20d68 BC |
78 | pthread_condattr_destroy(&cond); |
79 | pthread_mutexattr_destroy(&attr); | |
80 | ||
cdd18ad8 | 81 | return mutex; |
07739b57 | 82 | err: |
cdd18ad8 JA |
83 | if (mutex) |
84 | fio_mutex_remove(mutex); | |
f7c9e00e | 85 | |
07739b57 JA |
86 | return NULL; |
87 | } | |
88 | ||
ef635057 JA |
89 | static int mutex_timed_out(struct timeval *t, unsigned int seconds) |
90 | { | |
91 | return mtime_since_now(t) >= seconds * 1000; | |
92 | } | |
93 | ||
656b1393 JA |
94 | int fio_mutex_down_timeout(struct fio_mutex *mutex, unsigned int seconds) |
95 | { | |
ef635057 | 96 | struct timeval tv_s; |
656b1393 JA |
97 | struct timespec t; |
98 | int ret = 0; | |
99 | ||
ef635057 JA |
100 | fio_gettime(&tv_s, NULL); |
101 | ||
b4c1fb36 | 102 | clock_gettime(fio_clk_id, &t); |
656b1393 JA |
103 | t.tv_sec += seconds; |
104 | ||
105 | pthread_mutex_lock(&mutex->lock); | |
106 | ||
107 | while (!mutex->value && !ret) { | |
108 | mutex->waiters++; | |
ef635057 JA |
109 | |
110 | /* | |
111 | * Some platforms (FreeBSD 9?) seems to return timed out | |
112 | * way too early, double check. | |
113 | */ | |
656b1393 | 114 | ret = pthread_cond_timedwait(&mutex->cond, &mutex->lock, &t); |
ef635057 JA |
115 | if (ret == ETIMEDOUT && !mutex_timed_out(&tv_s, seconds)) { |
116 | pthread_mutex_lock(&mutex->lock); | |
117 | ret = 0; | |
118 | } | |
119 | ||
656b1393 JA |
120 | mutex->waiters--; |
121 | } | |
122 | ||
123 | if (!ret) { | |
124 | mutex->value--; | |
125 | pthread_mutex_unlock(&mutex->lock); | |
126 | } | |
127 | ||
128 | return ret; | |
129 | } | |
130 | ||
cdd18ad8 | 131 | void fio_mutex_down(struct fio_mutex *mutex) |
07739b57 | 132 | { |
cdd18ad8 | 133 | pthread_mutex_lock(&mutex->lock); |
4d4e80f2 JA |
134 | |
135 | while (!mutex->value) { | |
136 | mutex->waiters++; | |
cdd18ad8 | 137 | pthread_cond_wait(&mutex->cond, &mutex->lock); |
4d4e80f2 JA |
138 | mutex->waiters--; |
139 | } | |
140 | ||
cdd18ad8 JA |
141 | mutex->value--; |
142 | pthread_mutex_unlock(&mutex->lock); | |
07739b57 JA |
143 | } |
144 | ||
cdd18ad8 | 145 | void fio_mutex_up(struct fio_mutex *mutex) |
07739b57 | 146 | { |
cdd18ad8 | 147 | pthread_mutex_lock(&mutex->lock); |
4d4e80f2 JA |
148 | read_barrier(); |
149 | if (!mutex->value && mutex->waiters) | |
cdd18ad8 JA |
150 | pthread_cond_signal(&mutex->cond); |
151 | mutex->value++; | |
152 | pthread_mutex_unlock(&mutex->lock); | |
07739b57 | 153 | } |
64d4d313 JA |
154 | |
155 | void fio_mutex_down_write(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_down_read(struct fio_mutex *mutex) | |
170 | { | |
171 | pthread_mutex_lock(&mutex->lock); | |
4d4e80f2 JA |
172 | |
173 | while (mutex->value < 0) { | |
174 | mutex->waiters++; | |
64d4d313 | 175 | pthread_cond_wait(&mutex->cond, &mutex->lock); |
4d4e80f2 JA |
176 | mutex->waiters--; |
177 | } | |
178 | ||
64d4d313 JA |
179 | mutex->value++; |
180 | pthread_mutex_unlock(&mutex->lock); | |
181 | } | |
182 | ||
183 | void fio_mutex_up_read(struct fio_mutex *mutex) | |
184 | { | |
185 | pthread_mutex_lock(&mutex->lock); | |
186 | mutex->value--; | |
4d4e80f2 JA |
187 | read_barrier(); |
188 | if (mutex->value >= 0 && mutex->waiters) | |
64d4d313 JA |
189 | pthread_cond_signal(&mutex->cond); |
190 | pthread_mutex_unlock(&mutex->lock); | |
191 | } | |
192 | ||
193 | void fio_mutex_up_write(struct fio_mutex *mutex) | |
194 | { | |
195 | pthread_mutex_lock(&mutex->lock); | |
196 | mutex->value++; | |
4d4e80f2 JA |
197 | read_barrier(); |
198 | if (mutex->value >= 0 && mutex->waiters) | |
64d4d313 JA |
199 | pthread_cond_signal(&mutex->cond); |
200 | pthread_mutex_unlock(&mutex->lock); | |
201 | } | |
b4c1fb36 JA |
202 | |
203 | static void fio_init fio_mutex_global_init(void) | |
204 | { | |
205 | #ifdef FIO_HAVE_PTHREAD_CONDATTR_SETCLOCK | |
206 | #ifdef FIO_HAVE_CLOCK_MONOTONIC | |
207 | pthread_condattr_t cond; | |
208 | ||
209 | pthread_condattr_init(&cond); | |
210 | ||
211 | if (!pthread_condattr_setclock(&cond, CLOCK_MONOTONIC)) | |
212 | fio_clk_id = CLOCK_MONOTONIC; | |
213 | ||
214 | pthread_condattr_destroy(&cond); | |
215 | #endif | |
216 | #endif | |
217 | } |