#include <unistd.h>
#include <stdlib.h>
#include <fcntl.h>
+#include <time.h>
+#include <errno.h>
#include <pthread.h>
#include <sys/mman.h>
+#include <assert.h>
+#include "fio.h"
+#include "log.h"
#include "mutex.h"
+#include "arch/arch.h"
+#include "os/os.h"
+#include "helpers.h"
+#include "fio_time.h"
+#include "gettime.h"
-void fio_sem_remove(struct fio_sem *sem)
+void __fio_mutex_remove(struct fio_mutex *mutex)
{
- unlink(sem->sem_name);
- munmap(sem, sizeof(*sem));
+ assert(mutex->magic == FIO_MUTEX_MAGIC);
+ pthread_cond_destroy(&mutex->cond);
+
+ /*
+ * Ensure any subsequent attempt to grab this mutex will fail
+ * with an assert, instead of just silently hanging.
+ */
+ memset(mutex, 0, sizeof(*mutex));
}
-struct fio_sem *fio_sem_init(int value)
+void fio_mutex_remove(struct fio_mutex *mutex)
{
- struct fio_sem *sem = NULL;
- pthread_mutexattr_t attr;
- char sem_name[32];
- int fd;
+ __fio_mutex_remove(mutex);
+ munmap((void *) mutex, sizeof(*mutex));
+}
- sprintf(sem_name, "/tmp/.fio_lock.XXXXXX");
- fd = mkstemp(sem_name);
- if (fd < 0) {
- perror("open sem");
- return NULL;
- }
+int cond_init_pshared(pthread_cond_t *cond)
+{
+ pthread_condattr_t cattr;
+ int ret;
- if (ftruncate(fd, sizeof(struct fio_sem)) < 0) {
- perror("ftruncate sem");
- goto err;
+ ret = pthread_condattr_init(&cattr);
+ if (ret) {
+ log_err("pthread_condattr_init: %s\n", strerror(ret));
+ return ret;
}
- sem = mmap(NULL, sizeof(struct fio_sem), PROT_READ | PROT_WRITE,
- MAP_SHARED, fd, 0);
- if (sem == MAP_FAILED) {
- perror("mmap sem");
- close(fd);
- sem = NULL;
- goto err;
+#ifdef FIO_HAVE_PSHARED_MUTEX
+ ret = pthread_condattr_setpshared(&cattr, PTHREAD_PROCESS_SHARED);
+ if (ret) {
+ log_err("pthread_condattr_setpshared: %s\n", strerror(ret));
+ return ret;
+ }
+#endif
+ ret = pthread_cond_init(cond, &cattr);
+ if (ret) {
+ log_err("pthread_cond_init: %s\n", strerror(ret));
+ return ret;
}
- close(fd);
- sem->value = value;
- strcpy(sem->sem_name, sem_name);
+ return 0;
+}
- if (pthread_mutexattr_init(&attr)) {
- perror("pthread_mutexattr_init");
- goto err;
+int mutex_init_pshared(pthread_mutex_t *mutex)
+{
+ pthread_mutexattr_t mattr;
+ int ret;
+
+ ret = pthread_mutexattr_init(&mattr);
+ if (ret) {
+ log_err("pthread_mutexattr_init: %s\n", strerror(ret));
+ return ret;
}
- if (pthread_mutexattr_setpshared(&attr, PTHREAD_PROCESS_SHARED)) {
- perror("pthread_mutexattr_setpshared");
- goto err;
+
+ /*
+ * Not all platforms support process shared mutexes (FreeBSD)
+ */
+#ifdef FIO_HAVE_PSHARED_MUTEX
+ ret = pthread_mutexattr_setpshared(&mattr, PTHREAD_PROCESS_SHARED);
+ if (ret) {
+ log_err("pthread_mutexattr_setpshared: %s\n", strerror(ret));
+ return ret;
}
- if (pthread_mutex_init(&sem->lock, &attr)) {
- perror("pthread_mutex_init");
- goto err;
+#endif
+ ret = pthread_mutex_init(mutex, &mattr);
+ if (ret) {
+ log_err("pthread_mutex_init: %s\n", strerror(ret));
+ return ret;
}
- return sem;
-err:
- if (sem)
- munmap(sem, sizeof(*sem));
- unlink(sem_name);
+ return 0;
+}
+
+int mutex_cond_init_pshared(pthread_mutex_t *mutex, pthread_cond_t *cond)
+{
+ int ret;
+
+ ret = mutex_init_pshared(mutex);
+ if (ret)
+ return ret;
+
+ ret = cond_init_pshared(cond);
+ if (ret)
+ return ret;
+
+ return 0;
+}
+
+int __fio_mutex_init(struct fio_mutex *mutex, int value)
+{
+ int ret;
+
+ mutex->value = value;
+ mutex->magic = FIO_MUTEX_MAGIC;
+
+ ret = mutex_cond_init_pshared(&mutex->lock, &mutex->cond);
+ if (ret)
+ return ret;
+
+ return 0;
+}
+
+struct fio_mutex *fio_mutex_init(int value)
+{
+ struct fio_mutex *mutex = NULL;
+
+ mutex = (void *) mmap(NULL, sizeof(struct fio_mutex),
+ PROT_READ | PROT_WRITE,
+ OS_MAP_ANON | MAP_SHARED, -1, 0);
+ if (mutex == MAP_FAILED) {
+ perror("mmap mutex");
+ return NULL;
+ }
+
+ if (!__fio_mutex_init(mutex, value))
+ return mutex;
+
+ fio_mutex_remove(mutex);
return NULL;
}
-void fio_sem_down(struct fio_sem *sem)
+static bool mutex_timed_out(struct timeval *t, unsigned int msecs)
{
- pthread_mutex_lock(&sem->lock);
- while (sem->value == 0)
- pthread_cond_wait(&sem->cond, &sem->lock);
- sem->value--;
- pthread_mutex_unlock(&sem->lock);
+ struct timeval now;
+
+ gettimeofday(&now, NULL);
+ return mtime_since(t, &now) >= msecs;
}
-void fio_sem_up(struct fio_sem *sem)
+int fio_mutex_down_timeout(struct fio_mutex *mutex, unsigned int msecs)
{
- pthread_mutex_lock(&sem->lock);
- if (!sem->value)
- pthread_cond_signal(&sem->cond);
- sem->value++;
- pthread_mutex_unlock(&sem->lock);
+ struct timeval tv_s;
+ struct timespec t;
+ int ret = 0;
+
+ assert(mutex->magic == FIO_MUTEX_MAGIC);
+
+ gettimeofday(&tv_s, NULL);
+ t.tv_sec = tv_s.tv_sec;
+ t.tv_nsec = tv_s.tv_usec * 1000;
+
+ t.tv_sec += msecs / 1000;
+ t.tv_nsec += ((msecs * 1000000ULL) % 1000000000);
+ if (t.tv_nsec >= 1000000000) {
+ t.tv_nsec -= 1000000000;
+ t.tv_sec++;
+ }
+
+ pthread_mutex_lock(&mutex->lock);
+
+ mutex->waiters++;
+ while (!mutex->value && !ret) {
+ /*
+ * Some platforms (FreeBSD 9?) seems to return timed out
+ * way too early, double check.
+ */
+ ret = pthread_cond_timedwait(&mutex->cond, &mutex->lock, &t);
+ if (ret == ETIMEDOUT && !mutex_timed_out(&tv_s, msecs))
+ ret = 0;
+ }
+ mutex->waiters--;
+
+ if (!ret) {
+ mutex->value--;
+ pthread_mutex_unlock(&mutex->lock);
+ return 0;
+ }
+
+ pthread_mutex_unlock(&mutex->lock);
+ return ret;
+}
+
+bool fio_mutex_down_trylock(struct fio_mutex *mutex)
+{
+ bool ret = true;
+
+ assert(mutex->magic == FIO_MUTEX_MAGIC);
+
+ pthread_mutex_lock(&mutex->lock);
+ if (mutex->value) {
+ mutex->value--;
+ ret = false;
+ }
+ pthread_mutex_unlock(&mutex->lock);
+
+ return ret;
+}
+
+void fio_mutex_down(struct fio_mutex *mutex)
+{
+ assert(mutex->magic == FIO_MUTEX_MAGIC);
+
+ pthread_mutex_lock(&mutex->lock);
+
+ while (!mutex->value) {
+ mutex->waiters++;
+ pthread_cond_wait(&mutex->cond, &mutex->lock);
+ mutex->waiters--;
+ }
+
+ mutex->value--;
+ pthread_mutex_unlock(&mutex->lock);
+}
+
+void fio_mutex_up(struct fio_mutex *mutex)
+{
+ int do_wake = 0;
+
+ assert(mutex->magic == FIO_MUTEX_MAGIC);
+
+ pthread_mutex_lock(&mutex->lock);
+ read_barrier();
+ if (!mutex->value && mutex->waiters)
+ do_wake = 1;
+ mutex->value++;
+ pthread_mutex_unlock(&mutex->lock);
+
+ if (do_wake)
+ pthread_cond_signal(&mutex->cond);
+}
+
+void fio_rwlock_write(struct fio_rwlock *lock)
+{
+ assert(lock->magic == FIO_RWLOCK_MAGIC);
+ pthread_rwlock_wrlock(&lock->lock);
+}
+
+void fio_rwlock_read(struct fio_rwlock *lock)
+{
+ assert(lock->magic == FIO_RWLOCK_MAGIC);
+ pthread_rwlock_rdlock(&lock->lock);
+}
+
+void fio_rwlock_unlock(struct fio_rwlock *lock)
+{
+ assert(lock->magic == FIO_RWLOCK_MAGIC);
+ pthread_rwlock_unlock(&lock->lock);
+}
+
+void fio_rwlock_remove(struct fio_rwlock *lock)
+{
+ assert(lock->magic == FIO_RWLOCK_MAGIC);
+ munmap((void *) lock, sizeof(*lock));
+}
+
+struct fio_rwlock *fio_rwlock_init(void)
+{
+ struct fio_rwlock *lock;
+ pthread_rwlockattr_t attr;
+ int ret;
+
+ lock = (void *) mmap(NULL, sizeof(struct fio_rwlock),
+ PROT_READ | PROT_WRITE,
+ OS_MAP_ANON | MAP_SHARED, -1, 0);
+ if (lock == MAP_FAILED) {
+ perror("mmap rwlock");
+ lock = NULL;
+ goto err;
+ }
+
+ lock->magic = FIO_RWLOCK_MAGIC;
+
+ ret = pthread_rwlockattr_init(&attr);
+ if (ret) {
+ log_err("pthread_rwlockattr_init: %s\n", strerror(ret));
+ goto err;
+ }
+#ifdef FIO_HAVE_PSHARED_MUTEX
+ ret = pthread_rwlockattr_setpshared(&attr, PTHREAD_PROCESS_SHARED);
+ if (ret) {
+ log_err("pthread_rwlockattr_setpshared: %s\n", strerror(ret));
+ goto destroy_attr;
+ }
+
+ ret = pthread_rwlock_init(&lock->lock, &attr);
+#else
+ ret = pthread_rwlock_init(&lock->lock, NULL);
+#endif
+
+ if (ret) {
+ log_err("pthread_rwlock_init: %s\n", strerror(ret));
+ goto destroy_attr;
+ }
+
+ pthread_rwlockattr_destroy(&attr);
+
+ return lock;
+destroy_attr:
+ pthread_rwlockattr_destroy(&attr);
+err:
+ if (lock)
+ fio_rwlock_remove(lock);
+ return NULL;
}
projects / fio.git / blobdiff