-#include <stdio.h>
#include <string.h>
-#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 "pshared.h"
#include "os/os.h"
-#include "helpers.h"
-#include "time.h"
+#include "fio_time.h"
#include "gettime.h"
-void fio_mutex_remove(struct fio_mutex *mutex)
+void __fio_mutex_remove(struct fio_mutex *mutex)
{
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));
+}
+
+void fio_mutex_remove(struct fio_mutex *mutex)
+{
+ __fio_mutex_remove(mutex);
munmap((void *) mutex, sizeof(*mutex));
}
+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;
- pthread_mutexattr_t attr;
- pthread_condattr_t cond;
- int ret;
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");
- mutex = NULL;
- goto err;
+ return NULL;
}
- mutex->value = value;
- mutex->magic = FIO_MUTEX_MAGIC;
-
- ret = pthread_mutexattr_init(&attr);
- if (ret) {
- log_err("pthread_mutexattr_init: %s\n", strerror(ret));
- goto err;
- }
-
- /*
- * Not all platforms support process shared mutexes (FreeBSD)
- */
-#ifdef FIO_HAVE_PSHARED_MUTEX
- ret = pthread_mutexattr_setpshared(&attr, PTHREAD_PROCESS_SHARED);
- if (ret) {
- log_err("pthread_mutexattr_setpshared: %s\n", strerror(ret));
- goto err;
- }
-#endif
-
- pthread_condattr_init(&cond);
-#ifdef FIO_HAVE_PSHARED_MUTEX
- pthread_condattr_setpshared(&cond, PTHREAD_PROCESS_SHARED);
-#endif
- pthread_cond_init(&mutex->cond, &cond);
-
- ret = pthread_mutex_init(&mutex->lock, &attr);
- if (ret) {
- log_err("pthread_mutex_init: %s\n", strerror(ret));
- goto err;
- }
-
- pthread_condattr_destroy(&cond);
- pthread_mutexattr_destroy(&attr);
-
- return mutex;
-err:
- if (mutex)
- fio_mutex_remove(mutex);
+ if (!__fio_mutex_init(mutex, value))
+ return mutex;
+ fio_mutex_remove(mutex);
return NULL;
}
-static int mutex_timed_out(struct timeval *t, unsigned int seconds)
+static bool mutex_timed_out(struct timespec *t, unsigned int msecs)
{
- return mtime_since_now(t) >= seconds * 1000;
+ struct timeval tv;
+ struct timespec now;
+
+ gettimeofday(&tv, NULL);
+ now.tv_sec = tv.tv_sec;
+ now.tv_nsec = tv.tv_usec * 1000;
+
+ return mtime_since(t, &now) >= msecs;
}
-int fio_mutex_down_timeout(struct fio_mutex *mutex, unsigned int seconds)
+int fio_mutex_down_timeout(struct fio_mutex *mutex, unsigned int msecs)
{
struct timeval tv_s;
+ struct timespec base;
struct timespec t;
int ret = 0;
assert(mutex->magic == FIO_MUTEX_MAGIC);
gettimeofday(&tv_s, NULL);
- t.tv_sec = tv_s.tv_sec + seconds;
- t.tv_nsec = tv_s.tv_usec * 1000;
+ base.tv_sec = t.tv_sec = tv_s.tv_sec;
+ base.tv_nsec = 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) {
- mutex->waiters++;
-
/*
* 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, seconds))
+ if (ret == ETIMEDOUT && !mutex_timed_out(&base, msecs))
ret = 0;
-
- mutex->waiters--;
}
+ 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_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)
- pthread_cond_signal(&mutex->cond);
+ do_wake = 1;
mutex->value++;
- pthread_mutex_unlock(&mutex->lock);
-}
-
-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;
- 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_rwlock_init(&lock->lock, NULL);
- if (ret) {
- log_err("pthread_rwlock_init: %s\n", strerror(ret));
- goto err;
- }
+ if (do_wake)
+ pthread_cond_signal(&mutex->cond);
- return lock;
-err:
- if (lock)
- fio_rwlock_remove(lock);
- return NULL;
+ pthread_mutex_unlock(&mutex->lock);
}
projects / fio.git / blobdiff