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/*
* sync.c
*
* Copyright 2012 Google, Inc
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <fcntl.h>
#include <stdint.h>
#include <string.h>
#include <linux/sync.h>
#include <linux/sw_sync.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
#include <sys/types.h>
int sync_wait(int fd, int timeout)
{
__s32 to = timeout;
return ioctl(fd, SYNC_IOC_WAIT, &to);
}
int sync_merge(const char *name, int fd1, int fd2)
{
struct sync_merge_data data;
int err;
data.fd2 = fd2;
strlcpy(data.name, name, sizeof(data.name));
err = ioctl(fd1, SYNC_IOC_MERGE, &data);
if (err < 0)
return err;
return data.fence;
}
struct sync_fence_info_data *sync_fence_info(int fd)
{
struct sync_fence_info_data *info;
int err;
info = malloc(4096);
if (info == NULL)
return NULL;
info->len = 4096;
err = ioctl(fd, SYNC_IOC_FENCE_INFO, info);
if (err < 0) {
free(info);
return NULL;
}
return info;
}
struct sync_pt_info *sync_pt_info(struct sync_fence_info_data *info,
struct sync_pt_info *itr)
{
if (itr == NULL)
itr = (struct sync_pt_info *) info->pt_info;
else
itr = (struct sync_pt_info *) ((__u8 *)itr + itr->len);
if ((__u8 *)itr - (__u8 *)info >= (int)info->len)
return NULL;
return itr;
}
void sync_fence_info_free(struct sync_fence_info_data *info)
{
free(info);
}
int sw_sync_timeline_create(void)
{
return open("/dev/sw_sync", O_RDWR);
}
int sw_sync_timeline_inc(int fd, unsigned count)
{
__u32 arg = count;
return ioctl(fd, SW_SYNC_IOC_INC, &arg);
}
int sw_sync_fence_create(int fd, const char *name, unsigned value)
{
struct sw_sync_create_fence_data data;
int err;
data.value = value;
strlcpy(data.name, name, sizeof(data.name));
err = ioctl(fd, SW_SYNC_IOC_CREATE_FENCE, &data);
if (err < 0)
return err;
return data.fence;
}
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