sync: Add lib sync helper library (196b3a5f) · Commits · e / os / android_system_core

include/sync/sync.h

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		/*
		* sync.h
		*
		* 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.
		*/

		#ifndef __SYS_CORE_SYNC_H
		#define __SYS_CORE_SYNC_H

		#include <linux/sync.h>
		#include <linux/sw_sync.h>

		__BEGIN_DECLS

		/* timeout in msecs */
		int sync_wait(int fd, unsigned int timeout);
		int sync_merge(const char *name, int fd1, int fd2);
		struct sync_fence_info_data *sync_fence_info(int fd);
		struct sync_pt_info sync_pt_info(struct sync_fence_info_data info,
		struct sync_pt_info *itr);
		void sync_fence_info_free(struct sync_fence_info_data *info);

		/* sw_sync is mainly inteded for testing and should not be complied into
		* production kernels
		*/

		int sw_sync_timeline_create(void);
		int sw_sync_timeline_inc(int fd, unsigned count);
		int sw_sync_fence_create(int fd, const char *name, unsigned value);

		__END_DECLS

		#endif /* __SYS_CORE_SYNC_H */

libsync/Android.mk

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		LOCAL_PATH:= $(call my-dir)

		include $(CLEAR_VARS)
		LOCAL_SRC_FILES := sync.c
		LOCAL_MODULE := libsync
		LOCAL_MODULE_TAGS := optional
		LOCAL_SHARED_LIBRARIES := liblog
		include $(BUILD_SHARED_LIBRARY)

		include $(CLEAR_VARS)
		LOCAL_SRC_FILES := sync.c sync_test.c
		LOCAL_MODULE := sync_test
		LOCAL_MODULE_TAGS := optional tests
		LOCAL_SHARED_LIBRARIES := liblog
		include $(BUILD_EXECUTABLE)

libsync/sync.c

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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 <sys/ioctl.h>
		#include <sys/stat.h>
		#include <sys/types.h>

		#include <sync/sync.h>

		int sync_wait(int fd, unsigned int timeout)
		{
		__u32 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;
		}

libsync/sync_test.c

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		/*
		* sync_test.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 <errno.h>
		#include <pthread.h>
		#include <stdio.h>
		#include <string.h>
		#include <unistd.h>

		#include <sync/sync.h>

		pthread_mutex_t printf_mutex = PTHREAD_MUTEX_INITIALIZER;

		struct sync_thread_data {
		int thread_no;
		int fd[2];
		};

		void sync_thread(void data)
		{
		struct sync_thread_data *sync_data = data;
		struct sync_fence_info_data *info;
		int err;
		int i;

		for (i = 0; i < 2; i++) {
		err = sync_wait(sync_data->fd[i], 10000);

		pthread_mutex_lock(&printf_mutex);
		if (err < 0) {
		printf("thread %d wait %d failed: %s\n", sync_data->thread_no,
		i, strerror(errno));
		} else {
		printf("thread %d wait %d done\n", sync_data->thread_no, i);
		}
		info = sync_fence_info(sync_data->fd[i]);
		if (info) {
		struct sync_pt_info *pt_info = NULL;
		printf(" fence %s %d\n", info->name, info->status);

		while ((pt_info = sync_pt_info(info, pt_info))) {
		int ts_sec = pt_info->timestamp_ns / 1000000000LL;
		int ts_usec = (pt_info->timestamp_ns % 1000000000LL) / 1000LL;
		printf(" pt %s %s %d %d.%06d", pt_info->obj_name,
		pt_info->driver_name, pt_info->status,
		ts_sec, ts_usec);
		if (!strcmp(pt_info->driver_name, "sw_sync"))
		printf(" val=%d\n", (uint32_t )pt_info->driver_data);
		else
		printf("\n");
		}
		sync_fence_info_free(info);
		}
		pthread_mutex_unlock(&printf_mutex);
		}

		return NULL;
		}

		int main(int argc, char *argv[])
		{
		struct sync_thread_data sync_data[4];
		pthread_t threads[4];
		int sync_timeline_fd;
		int i, j;
		char str[256];

		sync_timeline_fd = sw_sync_timeline_create();
		if (sync_timeline_fd < 0) {
		perror("can't create sw_sync_timeline:");
		return 1;
		}

		for (i = 0; i < 3; i++) {
		sync_data[i].thread_no = i;

		for (j = 0; j < 2; j++) {
		unsigned val = i + j * 3 + 1;
		sprintf(str, "test_fence%d-%d", i, j);
		int fd = sw_sync_fence_create(sync_timeline_fd, str, val);
		if (fd < 0) {
		printf("can't create sync pt %d: %s", val, strerror(errno));
		return 1;
		}
		sync_data[i].fd[j] = fd;
		printf("sync_data[%d].fd[%d] = %d;\n", i, j, fd);

		}
		}

		sync_data[3].thread_no = 3;
		for (j = 0; j < 2; j++) {
		sprintf(str, "merged_fence%d", j);
		sync_data[3].fd[j] = sync_merge(str, sync_data[0].fd[j], sync_data[1].fd[j]);
		if (sync_data[3].fd[j] < 0) {
		printf("can't merge sync pts %d and %d: %s\n",
		sync_data[0].fd[j], sync_data[1].fd[j], strerror(errno));
		return 1;
		}
		}

		for (i = 0; i < 4; i++)
		pthread_create(&threads[i], NULL, sync_thread, &sync_data[i]);


		for (i = 0; i < 3; i++) {
		int err;
		printf("press enter to inc to %d\n", i+1);
		fgets(str, sizeof(str), stdin);
		err = sw_sync_timeline_inc(sync_timeline_fd, 1);
		if (err < 0) {
		perror("can't increment sync obj:");
		return 1;
		}
		}

		printf("press enter to close sync_timeline\n");
		fgets(str, sizeof(str), stdin);

		close(sync_timeline_fd);

		printf("press enter to end test\n");
		fgets(str, sizeof(str), stdin);

		for (i = 0; i < 3; i++) {
		void *val;
		pthread_join(threads[i], &val);
		}

		return 0;
		}