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#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 "fio.h"
#include "log.h"
#include "mutex.h"
#include "arch/arch.h"
#include "os/os.h"
#include "helpers.h"
#include "time.h"
#include "gettime.h"
void fio_mutex_remove(struct fio_mutex *mutex)
{
pthread_cond_destroy(&mutex->cond);
munmap((void *) mutex, sizeof(*mutex));
}
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;
}
mutex->value = value;
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);
return NULL;
}
static int mutex_timed_out(struct timeval *t, unsigned int seconds)
{
return mtime_since_now(t) >= seconds * 1000;
}
int fio_mutex_down_timeout(struct fio_mutex *mutex, unsigned int seconds)
{
struct timeval tv_s;
struct timespec t;
int ret = 0;
gettimeofday(&tv_s, NULL);
t.tv_sec = tv_s.tv_sec + seconds;
t.tv_nsec = tv_s.tv_usec * 1000;
pthread_mutex_lock(&mutex->lock);
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)) {
pthread_mutex_lock(&mutex->lock);
ret = 0;
}
mutex->waiters--;
}
if (!ret) {
mutex->value--;
pthread_mutex_unlock(&mutex->lock);
}
return ret;
}
void fio_mutex_down(struct fio_mutex *mutex)
{
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)
{
pthread_mutex_lock(&mutex->lock);
read_barrier();
if (!mutex->value && mutex->waiters)
pthread_cond_signal(&mutex->cond);
mutex->value++;
pthread_mutex_unlock(&mutex->lock);
}
void fio_mutex_down_write(struct fio_mutex *mutex)
{
pthread_mutex_lock(&mutex->lock);
while (mutex->value != 0) {
mutex->waiters++;
pthread_cond_wait(&mutex->cond, &mutex->lock);
mutex->waiters--;
}
mutex->value--;
pthread_mutex_unlock(&mutex->lock);
}
void fio_mutex_down_read(struct fio_mutex *mutex)
{
pthread_mutex_lock(&mutex->lock);
while (mutex->value < 0) {
mutex->waiters++;
pthread_cond_wait(&mutex->cond, &mutex->lock);
mutex->waiters--;
}
mutex->value++;
pthread_mutex_unlock(&mutex->lock);
}
void fio_mutex_up_read(struct fio_mutex *mutex)
{
pthread_mutex_lock(&mutex->lock);
mutex->value--;
read_barrier();
if (mutex->value >= 0 && mutex->waiters)
pthread_cond_signal(&mutex->cond);
pthread_mutex_unlock(&mutex->lock);
}
void fio_mutex_up_write(struct fio_mutex *mutex)
{
pthread_mutex_lock(&mutex->lock);
mutex->value++;
read_barrier();
if (mutex->value >= 0 && mutex->waiters)
pthread_cond_signal(&mutex->cond);
pthread_mutex_unlock(&mutex->lock);
}
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