| 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 | void fio_mutex_remove(struct fio_mutex *mutex) |
| 28 | { |
| 29 | __fio_mutex_remove(mutex); |
| 30 | munmap((void *) mutex, sizeof(*mutex)); |
| 31 | } |
| 32 | |
| 33 | int __fio_mutex_init(struct fio_mutex *mutex, int value) |
| 34 | { |
| 35 | pthread_mutexattr_t attr; |
| 36 | pthread_condattr_t cond; |
| 37 | int ret; |
| 38 | |
| 39 | mutex->value = value; |
| 40 | mutex->magic = FIO_MUTEX_MAGIC; |
| 41 | |
| 42 | ret = pthread_mutexattr_init(&attr); |
| 43 | if (ret) { |
| 44 | log_err("pthread_mutexattr_init: %s\n", strerror(ret)); |
| 45 | return ret; |
| 46 | } |
| 47 | |
| 48 | /* |
| 49 | * Not all platforms support process shared mutexes (FreeBSD) |
| 50 | */ |
| 51 | #ifdef FIO_HAVE_PSHARED_MUTEX |
| 52 | ret = pthread_mutexattr_setpshared(&attr, PTHREAD_PROCESS_SHARED); |
| 53 | if (ret) { |
| 54 | log_err("pthread_mutexattr_setpshared: %s\n", strerror(ret)); |
| 55 | return ret; |
| 56 | } |
| 57 | #endif |
| 58 | |
| 59 | pthread_condattr_init(&cond); |
| 60 | #ifdef FIO_HAVE_PSHARED_MUTEX |
| 61 | pthread_condattr_setpshared(&cond, PTHREAD_PROCESS_SHARED); |
| 62 | #endif |
| 63 | pthread_cond_init(&mutex->cond, &cond); |
| 64 | |
| 65 | ret = pthread_mutex_init(&mutex->lock, &attr); |
| 66 | if (ret) { |
| 67 | log_err("pthread_mutex_init: %s\n", strerror(ret)); |
| 68 | return ret; |
| 69 | } |
| 70 | |
| 71 | pthread_condattr_destroy(&cond); |
| 72 | pthread_mutexattr_destroy(&attr); |
| 73 | return 0; |
| 74 | } |
| 75 | |
| 76 | struct fio_mutex *fio_mutex_init(int value) |
| 77 | { |
| 78 | struct fio_mutex *mutex = NULL; |
| 79 | |
| 80 | mutex = (void *) mmap(NULL, sizeof(struct fio_mutex), |
| 81 | PROT_READ | PROT_WRITE, |
| 82 | OS_MAP_ANON | MAP_SHARED, -1, 0); |
| 83 | if (mutex == MAP_FAILED) { |
| 84 | perror("mmap mutex"); |
| 85 | return NULL; |
| 86 | } |
| 87 | |
| 88 | if (!__fio_mutex_init(mutex, value)) |
| 89 | return mutex; |
| 90 | |
| 91 | fio_mutex_remove(mutex); |
| 92 | return NULL; |
| 93 | } |
| 94 | |
| 95 | static int mutex_timed_out(struct timeval *t, unsigned int seconds) |
| 96 | { |
| 97 | return mtime_since_now(t) >= seconds * 1000; |
| 98 | } |
| 99 | |
| 100 | int fio_mutex_down_timeout(struct fio_mutex *mutex, unsigned int seconds) |
| 101 | { |
| 102 | struct timeval tv_s; |
| 103 | struct timespec t; |
| 104 | int ret = 0; |
| 105 | |
| 106 | assert(mutex->magic == FIO_MUTEX_MAGIC); |
| 107 | |
| 108 | gettimeofday(&tv_s, NULL); |
| 109 | t.tv_sec = tv_s.tv_sec + seconds; |
| 110 | t.tv_nsec = tv_s.tv_usec * 1000; |
| 111 | |
| 112 | pthread_mutex_lock(&mutex->lock); |
| 113 | |
| 114 | while (!mutex->value && !ret) { |
| 115 | mutex->waiters++; |
| 116 | |
| 117 | /* |
| 118 | * Some platforms (FreeBSD 9?) seems to return timed out |
| 119 | * way too early, double check. |
| 120 | */ |
| 121 | ret = pthread_cond_timedwait(&mutex->cond, &mutex->lock, &t); |
| 122 | if (ret == ETIMEDOUT && !mutex_timed_out(&tv_s, seconds)) |
| 123 | ret = 0; |
| 124 | |
| 125 | mutex->waiters--; |
| 126 | } |
| 127 | |
| 128 | if (!ret) { |
| 129 | mutex->value--; |
| 130 | pthread_mutex_unlock(&mutex->lock); |
| 131 | } |
| 132 | |
| 133 | return ret; |
| 134 | } |
| 135 | |
| 136 | int fio_mutex_down_trylock(struct fio_mutex *mutex) |
| 137 | { |
| 138 | int ret = 1; |
| 139 | |
| 140 | assert(mutex->magic == FIO_MUTEX_MAGIC); |
| 141 | |
| 142 | pthread_mutex_lock(&mutex->lock); |
| 143 | if (mutex->value) { |
| 144 | mutex->value--; |
| 145 | ret = 0; |
| 146 | } |
| 147 | pthread_mutex_unlock(&mutex->lock); |
| 148 | |
| 149 | return ret; |
| 150 | } |
| 151 | |
| 152 | void fio_mutex_down(struct fio_mutex *mutex) |
| 153 | { |
| 154 | assert(mutex->magic == FIO_MUTEX_MAGIC); |
| 155 | |
| 156 | pthread_mutex_lock(&mutex->lock); |
| 157 | |
| 158 | while (!mutex->value) { |
| 159 | mutex->waiters++; |
| 160 | pthread_cond_wait(&mutex->cond, &mutex->lock); |
| 161 | mutex->waiters--; |
| 162 | } |
| 163 | |
| 164 | mutex->value--; |
| 165 | pthread_mutex_unlock(&mutex->lock); |
| 166 | } |
| 167 | |
| 168 | void fio_mutex_up(struct fio_mutex *mutex) |
| 169 | { |
| 170 | int do_wake = 0; |
| 171 | |
| 172 | assert(mutex->magic == FIO_MUTEX_MAGIC); |
| 173 | |
| 174 | pthread_mutex_lock(&mutex->lock); |
| 175 | read_barrier(); |
| 176 | if (!mutex->value && mutex->waiters) |
| 177 | do_wake = 1; |
| 178 | mutex->value++; |
| 179 | pthread_mutex_unlock(&mutex->lock); |
| 180 | |
| 181 | if (do_wake) |
| 182 | pthread_cond_signal(&mutex->cond); |
| 183 | } |
| 184 | |
| 185 | void fio_rwlock_write(struct fio_rwlock *lock) |
| 186 | { |
| 187 | assert(lock->magic == FIO_RWLOCK_MAGIC); |
| 188 | pthread_rwlock_wrlock(&lock->lock); |
| 189 | } |
| 190 | |
| 191 | void fio_rwlock_read(struct fio_rwlock *lock) |
| 192 | { |
| 193 | assert(lock->magic == FIO_RWLOCK_MAGIC); |
| 194 | pthread_rwlock_rdlock(&lock->lock); |
| 195 | } |
| 196 | |
| 197 | void fio_rwlock_unlock(struct fio_rwlock *lock) |
| 198 | { |
| 199 | assert(lock->magic == FIO_RWLOCK_MAGIC); |
| 200 | pthread_rwlock_unlock(&lock->lock); |
| 201 | } |
| 202 | |
| 203 | void fio_rwlock_remove(struct fio_rwlock *lock) |
| 204 | { |
| 205 | assert(lock->magic == FIO_RWLOCK_MAGIC); |
| 206 | munmap((void *) lock, sizeof(*lock)); |
| 207 | } |
| 208 | |
| 209 | struct fio_rwlock *fio_rwlock_init(void) |
| 210 | { |
| 211 | struct fio_rwlock *lock; |
| 212 | pthread_rwlockattr_t attr; |
| 213 | int ret; |
| 214 | |
| 215 | lock = (void *) mmap(NULL, sizeof(struct fio_rwlock), |
| 216 | PROT_READ | PROT_WRITE, |
| 217 | OS_MAP_ANON | MAP_SHARED, -1, 0); |
| 218 | if (lock == MAP_FAILED) { |
| 219 | perror("mmap rwlock"); |
| 220 | lock = NULL; |
| 221 | goto err; |
| 222 | } |
| 223 | |
| 224 | lock->magic = FIO_RWLOCK_MAGIC; |
| 225 | |
| 226 | ret = pthread_rwlockattr_init(&attr); |
| 227 | if (ret) { |
| 228 | log_err("pthread_rwlockattr_init: %s\n", strerror(ret)); |
| 229 | goto err; |
| 230 | } |
| 231 | #ifdef FIO_HAVE_PSHARED_MUTEX |
| 232 | ret = pthread_rwlockattr_setpshared(&attr, PTHREAD_PROCESS_SHARED); |
| 233 | if (ret) { |
| 234 | log_err("pthread_rwlockattr_setpshared: %s\n", strerror(ret)); |
| 235 | goto destroy_attr; |
| 236 | } |
| 237 | |
| 238 | ret = pthread_rwlock_init(&lock->lock, &attr); |
| 239 | #else |
| 240 | ret = pthread_rwlock_init(&lock->lock, NULL); |
| 241 | #endif |
| 242 | |
| 243 | if (ret) { |
| 244 | log_err("pthread_rwlock_init: %s\n", strerror(ret)); |
| 245 | goto destroy_attr; |
| 246 | } |
| 247 | |
| 248 | pthread_rwlockattr_destroy(&attr); |
| 249 | |
| 250 | return lock; |
| 251 | destroy_attr: |
| 252 | pthread_rwlockattr_destroy(&attr); |
| 253 | err: |
| 254 | if (lock) |
| 255 | fio_rwlock_remove(lock); |
| 256 | return NULL; |
| 257 | } |