| 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 | #include <assert.h> |
| 11 | |
| 12 | #include "fio.h" |
| 13 | #include "log.h" |
| 14 | #include "mutex.h" |
| 15 | #include "arch/arch.h" |
| 16 | #include "os/os.h" |
| 17 | #include "helpers.h" |
| 18 | #include "fio_time.h" |
| 19 | #include "gettime.h" |
| 20 | |
| 21 | void __fio_mutex_remove(struct fio_mutex *mutex) |
| 22 | { |
| 23 | assert(mutex->magic == FIO_MUTEX_MAGIC); |
| 24 | pthread_cond_destroy(&mutex->cond); |
| 25 | |
| 26 | /* |
| 27 | * Ensure any subsequent attempt to grab this mutex will fail |
| 28 | * with an assert, instead of just silently hanging. |
| 29 | */ |
| 30 | memset(mutex, 0, sizeof(*mutex)); |
| 31 | } |
| 32 | |
| 33 | void fio_mutex_remove(struct fio_mutex *mutex) |
| 34 | { |
| 35 | __fio_mutex_remove(mutex); |
| 36 | munmap((void *) mutex, sizeof(*mutex)); |
| 37 | } |
| 38 | |
| 39 | int cond_init_pshared(pthread_cond_t *cond) |
| 40 | { |
| 41 | pthread_condattr_t cattr; |
| 42 | int ret; |
| 43 | |
| 44 | ret = pthread_condattr_init(&cattr); |
| 45 | if (ret) { |
| 46 | log_err("pthread_condattr_init: %s\n", strerror(ret)); |
| 47 | return ret; |
| 48 | } |
| 49 | |
| 50 | #ifdef CONFIG_PSHARED |
| 51 | ret = pthread_condattr_setpshared(&cattr, PTHREAD_PROCESS_SHARED); |
| 52 | if (ret) { |
| 53 | log_err("pthread_condattr_setpshared: %s\n", strerror(ret)); |
| 54 | return ret; |
| 55 | } |
| 56 | #endif |
| 57 | ret = pthread_cond_init(cond, &cattr); |
| 58 | if (ret) { |
| 59 | log_err("pthread_cond_init: %s\n", strerror(ret)); |
| 60 | return ret; |
| 61 | } |
| 62 | |
| 63 | return 0; |
| 64 | } |
| 65 | |
| 66 | int mutex_init_pshared(pthread_mutex_t *mutex) |
| 67 | { |
| 68 | pthread_mutexattr_t mattr; |
| 69 | int ret; |
| 70 | |
| 71 | ret = pthread_mutexattr_init(&mattr); |
| 72 | if (ret) { |
| 73 | log_err("pthread_mutexattr_init: %s\n", strerror(ret)); |
| 74 | return ret; |
| 75 | } |
| 76 | |
| 77 | /* |
| 78 | * Not all platforms support process shared mutexes (FreeBSD) |
| 79 | */ |
| 80 | #ifdef CONFIG_PSHARED |
| 81 | ret = pthread_mutexattr_setpshared(&mattr, PTHREAD_PROCESS_SHARED); |
| 82 | if (ret) { |
| 83 | log_err("pthread_mutexattr_setpshared: %s\n", strerror(ret)); |
| 84 | return ret; |
| 85 | } |
| 86 | #endif |
| 87 | ret = pthread_mutex_init(mutex, &mattr); |
| 88 | if (ret) { |
| 89 | log_err("pthread_mutex_init: %s\n", strerror(ret)); |
| 90 | return ret; |
| 91 | } |
| 92 | |
| 93 | return 0; |
| 94 | } |
| 95 | |
| 96 | int mutex_cond_init_pshared(pthread_mutex_t *mutex, pthread_cond_t *cond) |
| 97 | { |
| 98 | int ret; |
| 99 | |
| 100 | ret = mutex_init_pshared(mutex); |
| 101 | if (ret) |
| 102 | return ret; |
| 103 | |
| 104 | ret = cond_init_pshared(cond); |
| 105 | if (ret) |
| 106 | return ret; |
| 107 | |
| 108 | return 0; |
| 109 | } |
| 110 | |
| 111 | int __fio_mutex_init(struct fio_mutex *mutex, int value) |
| 112 | { |
| 113 | int ret; |
| 114 | |
| 115 | mutex->value = value; |
| 116 | mutex->magic = FIO_MUTEX_MAGIC; |
| 117 | |
| 118 | ret = mutex_cond_init_pshared(&mutex->lock, &mutex->cond); |
| 119 | if (ret) |
| 120 | return ret; |
| 121 | |
| 122 | return 0; |
| 123 | } |
| 124 | |
| 125 | struct fio_mutex *fio_mutex_init(int value) |
| 126 | { |
| 127 | struct fio_mutex *mutex = NULL; |
| 128 | |
| 129 | mutex = (void *) mmap(NULL, sizeof(struct fio_mutex), |
| 130 | PROT_READ | PROT_WRITE, |
| 131 | OS_MAP_ANON | MAP_SHARED, -1, 0); |
| 132 | if (mutex == MAP_FAILED) { |
| 133 | perror("mmap mutex"); |
| 134 | return NULL; |
| 135 | } |
| 136 | |
| 137 | if (!__fio_mutex_init(mutex, value)) |
| 138 | return mutex; |
| 139 | |
| 140 | fio_mutex_remove(mutex); |
| 141 | return NULL; |
| 142 | } |
| 143 | |
| 144 | static bool mutex_timed_out(struct timespec *t, unsigned int msecs) |
| 145 | { |
| 146 | struct timeval tv; |
| 147 | struct timespec now; |
| 148 | |
| 149 | gettimeofday(&tv, NULL); |
| 150 | now.tv_sec = tv.tv_sec; |
| 151 | now.tv_nsec = tv.tv_usec * 1000; |
| 152 | |
| 153 | return mtime_since(t, &now) >= msecs; |
| 154 | } |
| 155 | |
| 156 | int fio_mutex_down_timeout(struct fio_mutex *mutex, unsigned int msecs) |
| 157 | { |
| 158 | struct timeval tv_s; |
| 159 | struct timespec base; |
| 160 | struct timespec t; |
| 161 | int ret = 0; |
| 162 | |
| 163 | assert(mutex->magic == FIO_MUTEX_MAGIC); |
| 164 | |
| 165 | gettimeofday(&tv_s, NULL); |
| 166 | base.tv_sec = t.tv_sec = tv_s.tv_sec; |
| 167 | base.tv_nsec = t.tv_nsec = tv_s.tv_usec * 1000; |
| 168 | |
| 169 | t.tv_sec += msecs / 1000; |
| 170 | t.tv_nsec += ((msecs * 1000000ULL) % 1000000000); |
| 171 | if (t.tv_nsec >= 1000000000) { |
| 172 | t.tv_nsec -= 1000000000; |
| 173 | t.tv_sec++; |
| 174 | } |
| 175 | |
| 176 | pthread_mutex_lock(&mutex->lock); |
| 177 | |
| 178 | mutex->waiters++; |
| 179 | while (!mutex->value && !ret) { |
| 180 | /* |
| 181 | * Some platforms (FreeBSD 9?) seems to return timed out |
| 182 | * way too early, double check. |
| 183 | */ |
| 184 | ret = pthread_cond_timedwait(&mutex->cond, &mutex->lock, &t); |
| 185 | if (ret == ETIMEDOUT && !mutex_timed_out(&base, msecs)) |
| 186 | ret = 0; |
| 187 | } |
| 188 | mutex->waiters--; |
| 189 | |
| 190 | if (!ret) { |
| 191 | mutex->value--; |
| 192 | pthread_mutex_unlock(&mutex->lock); |
| 193 | return 0; |
| 194 | } |
| 195 | |
| 196 | pthread_mutex_unlock(&mutex->lock); |
| 197 | return ret; |
| 198 | } |
| 199 | |
| 200 | bool fio_mutex_down_trylock(struct fio_mutex *mutex) |
| 201 | { |
| 202 | bool ret = true; |
| 203 | |
| 204 | assert(mutex->magic == FIO_MUTEX_MAGIC); |
| 205 | |
| 206 | pthread_mutex_lock(&mutex->lock); |
| 207 | if (mutex->value) { |
| 208 | mutex->value--; |
| 209 | ret = false; |
| 210 | } |
| 211 | pthread_mutex_unlock(&mutex->lock); |
| 212 | |
| 213 | return ret; |
| 214 | } |
| 215 | |
| 216 | void fio_mutex_down(struct fio_mutex *mutex) |
| 217 | { |
| 218 | assert(mutex->magic == FIO_MUTEX_MAGIC); |
| 219 | |
| 220 | pthread_mutex_lock(&mutex->lock); |
| 221 | |
| 222 | while (!mutex->value) { |
| 223 | mutex->waiters++; |
| 224 | pthread_cond_wait(&mutex->cond, &mutex->lock); |
| 225 | mutex->waiters--; |
| 226 | } |
| 227 | |
| 228 | mutex->value--; |
| 229 | pthread_mutex_unlock(&mutex->lock); |
| 230 | } |
| 231 | |
| 232 | void fio_mutex_up(struct fio_mutex *mutex) |
| 233 | { |
| 234 | int do_wake = 0; |
| 235 | |
| 236 | assert(mutex->magic == FIO_MUTEX_MAGIC); |
| 237 | |
| 238 | pthread_mutex_lock(&mutex->lock); |
| 239 | read_barrier(); |
| 240 | if (!mutex->value && mutex->waiters) |
| 241 | do_wake = 1; |
| 242 | mutex->value++; |
| 243 | |
| 244 | if (do_wake) |
| 245 | pthread_cond_signal(&mutex->cond); |
| 246 | |
| 247 | pthread_mutex_unlock(&mutex->lock); |
| 248 | } |
| 249 | |
| 250 | void fio_rwlock_write(struct fio_rwlock *lock) |
| 251 | { |
| 252 | assert(lock->magic == FIO_RWLOCK_MAGIC); |
| 253 | pthread_rwlock_wrlock(&lock->lock); |
| 254 | } |
| 255 | |
| 256 | void fio_rwlock_read(struct fio_rwlock *lock) |
| 257 | { |
| 258 | assert(lock->magic == FIO_RWLOCK_MAGIC); |
| 259 | pthread_rwlock_rdlock(&lock->lock); |
| 260 | } |
| 261 | |
| 262 | void fio_rwlock_unlock(struct fio_rwlock *lock) |
| 263 | { |
| 264 | assert(lock->magic == FIO_RWLOCK_MAGIC); |
| 265 | pthread_rwlock_unlock(&lock->lock); |
| 266 | } |
| 267 | |
| 268 | void fio_rwlock_remove(struct fio_rwlock *lock) |
| 269 | { |
| 270 | assert(lock->magic == FIO_RWLOCK_MAGIC); |
| 271 | munmap((void *) lock, sizeof(*lock)); |
| 272 | } |
| 273 | |
| 274 | struct fio_rwlock *fio_rwlock_init(void) |
| 275 | { |
| 276 | struct fio_rwlock *lock; |
| 277 | pthread_rwlockattr_t attr; |
| 278 | int ret; |
| 279 | |
| 280 | lock = (void *) mmap(NULL, sizeof(struct fio_rwlock), |
| 281 | PROT_READ | PROT_WRITE, |
| 282 | OS_MAP_ANON | MAP_SHARED, -1, 0); |
| 283 | if (lock == MAP_FAILED) { |
| 284 | perror("mmap rwlock"); |
| 285 | lock = NULL; |
| 286 | goto err; |
| 287 | } |
| 288 | |
| 289 | lock->magic = FIO_RWLOCK_MAGIC; |
| 290 | |
| 291 | ret = pthread_rwlockattr_init(&attr); |
| 292 | if (ret) { |
| 293 | log_err("pthread_rwlockattr_init: %s\n", strerror(ret)); |
| 294 | goto err; |
| 295 | } |
| 296 | #ifdef CONFIG_PSHARED |
| 297 | ret = pthread_rwlockattr_setpshared(&attr, PTHREAD_PROCESS_SHARED); |
| 298 | if (ret) { |
| 299 | log_err("pthread_rwlockattr_setpshared: %s\n", strerror(ret)); |
| 300 | goto destroy_attr; |
| 301 | } |
| 302 | |
| 303 | ret = pthread_rwlock_init(&lock->lock, &attr); |
| 304 | #else |
| 305 | ret = pthread_rwlock_init(&lock->lock, NULL); |
| 306 | #endif |
| 307 | |
| 308 | if (ret) { |
| 309 | log_err("pthread_rwlock_init: %s\n", strerror(ret)); |
| 310 | goto destroy_attr; |
| 311 | } |
| 312 | |
| 313 | pthread_rwlockattr_destroy(&attr); |
| 314 | |
| 315 | return lock; |
| 316 | destroy_attr: |
| 317 | pthread_rwlockattr_destroy(&attr); |
| 318 | err: |
| 319 | if (lock) |
| 320 | fio_rwlock_remove(lock); |
| 321 | return NULL; |
| 322 | } |