| 1 | #include <stdio.h> |
| 2 | #include <string.h> |
| 3 | #include <unistd.h> |
| 4 | #include <stdlib.h> |
| 5 | #include <fcntl.h> |
| 6 | #include <time.h> |
| 7 | #include <errno.h> |
| 8 | #include <pthread.h> |
| 9 | #include <sys/mman.h> |
| 10 | |
| 11 | #include "fio.h" |
| 12 | #include "log.h" |
| 13 | #include "mutex.h" |
| 14 | #include "arch/arch.h" |
| 15 | #include "os/os.h" |
| 16 | #include "helpers.h" |
| 17 | #include "time.h" |
| 18 | #include "gettime.h" |
| 19 | |
| 20 | static clockid_t fio_clk_id = CLOCK_REALTIME; |
| 21 | |
| 22 | void fio_mutex_remove(struct fio_mutex *mutex) |
| 23 | { |
| 24 | pthread_cond_destroy(&mutex->cond); |
| 25 | munmap((void *) mutex, sizeof(*mutex)); |
| 26 | } |
| 27 | |
| 28 | struct fio_mutex *fio_mutex_init(int value) |
| 29 | { |
| 30 | struct fio_mutex *mutex = NULL; |
| 31 | pthread_mutexattr_t attr; |
| 32 | pthread_condattr_t cond; |
| 33 | int ret; |
| 34 | |
| 35 | mutex = (void *) mmap(NULL, sizeof(struct fio_mutex), |
| 36 | PROT_READ | PROT_WRITE, |
| 37 | OS_MAP_ANON | MAP_SHARED, -1, 0); |
| 38 | if (mutex == MAP_FAILED) { |
| 39 | perror("mmap mutex"); |
| 40 | mutex = NULL; |
| 41 | goto err; |
| 42 | } |
| 43 | |
| 44 | mutex->value = value; |
| 45 | |
| 46 | ret = pthread_mutexattr_init(&attr); |
| 47 | if (ret) { |
| 48 | log_err("pthread_mutexattr_init: %s\n", strerror(ret)); |
| 49 | goto err; |
| 50 | } |
| 51 | |
| 52 | /* |
| 53 | * Not all platforms support process shared mutexes (FreeBSD) |
| 54 | */ |
| 55 | #ifdef FIO_HAVE_PSHARED_MUTEX |
| 56 | ret = pthread_mutexattr_setpshared(&attr, PTHREAD_PROCESS_SHARED); |
| 57 | if (ret) { |
| 58 | log_err("pthread_mutexattr_setpshared: %s\n", strerror(ret)); |
| 59 | goto err; |
| 60 | } |
| 61 | #endif |
| 62 | |
| 63 | pthread_condattr_init(&cond); |
| 64 | #ifdef FIO_HAVE_PSHARED_MUTEX |
| 65 | pthread_condattr_setpshared(&cond, PTHREAD_PROCESS_SHARED); |
| 66 | #endif |
| 67 | #ifdef FIO_HAVE_PTHREAD_CONDATTR_SETCLOCK |
| 68 | pthread_condattr_setclock(&cond, fio_clk_id); |
| 69 | #endif |
| 70 | pthread_cond_init(&mutex->cond, &cond); |
| 71 | |
| 72 | ret = pthread_mutex_init(&mutex->lock, &attr); |
| 73 | if (ret) { |
| 74 | log_err("pthread_mutex_init: %s\n", strerror(ret)); |
| 75 | goto err; |
| 76 | } |
| 77 | |
| 78 | pthread_condattr_destroy(&cond); |
| 79 | pthread_mutexattr_destroy(&attr); |
| 80 | |
| 81 | return mutex; |
| 82 | err: |
| 83 | if (mutex) |
| 84 | fio_mutex_remove(mutex); |
| 85 | |
| 86 | return NULL; |
| 87 | } |
| 88 | |
| 89 | static int mutex_timed_out(struct timeval *t, unsigned int seconds) |
| 90 | { |
| 91 | return mtime_since_now(t) >= seconds * 1000; |
| 92 | } |
| 93 | |
| 94 | int fio_mutex_down_timeout(struct fio_mutex *mutex, unsigned int seconds) |
| 95 | { |
| 96 | struct timeval tv_s; |
| 97 | struct timespec t; |
| 98 | int ret = 0; |
| 99 | |
| 100 | fio_gettime(&tv_s, NULL); |
| 101 | |
| 102 | clock_gettime(fio_clk_id, &t); |
| 103 | t.tv_sec += seconds; |
| 104 | |
| 105 | pthread_mutex_lock(&mutex->lock); |
| 106 | |
| 107 | while (!mutex->value && !ret) { |
| 108 | mutex->waiters++; |
| 109 | |
| 110 | /* |
| 111 | * Some platforms (FreeBSD 9?) seems to return timed out |
| 112 | * way too early, double check. |
| 113 | */ |
| 114 | ret = pthread_cond_timedwait(&mutex->cond, &mutex->lock, &t); |
| 115 | if (ret == ETIMEDOUT && !mutex_timed_out(&tv_s, seconds)) { |
| 116 | pthread_mutex_lock(&mutex->lock); |
| 117 | ret = 0; |
| 118 | } |
| 119 | |
| 120 | mutex->waiters--; |
| 121 | } |
| 122 | |
| 123 | if (!ret) { |
| 124 | mutex->value--; |
| 125 | pthread_mutex_unlock(&mutex->lock); |
| 126 | } |
| 127 | |
| 128 | return ret; |
| 129 | } |
| 130 | |
| 131 | void fio_mutex_down(struct fio_mutex *mutex) |
| 132 | { |
| 133 | pthread_mutex_lock(&mutex->lock); |
| 134 | |
| 135 | while (!mutex->value) { |
| 136 | mutex->waiters++; |
| 137 | pthread_cond_wait(&mutex->cond, &mutex->lock); |
| 138 | mutex->waiters--; |
| 139 | } |
| 140 | |
| 141 | mutex->value--; |
| 142 | pthread_mutex_unlock(&mutex->lock); |
| 143 | } |
| 144 | |
| 145 | void fio_mutex_up(struct fio_mutex *mutex) |
| 146 | { |
| 147 | pthread_mutex_lock(&mutex->lock); |
| 148 | read_barrier(); |
| 149 | if (!mutex->value && mutex->waiters) |
| 150 | pthread_cond_signal(&mutex->cond); |
| 151 | mutex->value++; |
| 152 | pthread_mutex_unlock(&mutex->lock); |
| 153 | } |
| 154 | |
| 155 | void fio_mutex_down_write(struct fio_mutex *mutex) |
| 156 | { |
| 157 | pthread_mutex_lock(&mutex->lock); |
| 158 | |
| 159 | while (mutex->value != 0) { |
| 160 | mutex->waiters++; |
| 161 | pthread_cond_wait(&mutex->cond, &mutex->lock); |
| 162 | mutex->waiters--; |
| 163 | } |
| 164 | |
| 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); |
| 172 | |
| 173 | while (mutex->value < 0) { |
| 174 | mutex->waiters++; |
| 175 | pthread_cond_wait(&mutex->cond, &mutex->lock); |
| 176 | mutex->waiters--; |
| 177 | } |
| 178 | |
| 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--; |
| 187 | read_barrier(); |
| 188 | if (mutex->value >= 0 && mutex->waiters) |
| 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++; |
| 197 | read_barrier(); |
| 198 | if (mutex->value >= 0 && mutex->waiters) |
| 199 | pthread_cond_signal(&mutex->cond); |
| 200 | pthread_mutex_unlock(&mutex->lock); |
| 201 | } |
| 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 | } |