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/*
* Copyright (C) 2012 The Android Open Source Project
*
* 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.
*/
#define LOG_TAG "Fence"
#define ATRACE_TAG ATRACE_TAG_GRAPHICS
//#define LOG_NDEBUG 0
// This is needed for stdint.h to define INT64_MAX in C++
#define __STDC_LIMIT_MACROS
#include <sync/sync.h>
#include <ui/Fence.h>
#include <unistd.h>
#include <utils/Log.h>
#include <utils/Trace.h>
namespace android {
const sp<Fence> Fence::NO_FENCE = sp<Fence>(new Fence);
Fence::Fence() :
mFenceFd(-1) {
}
Fence::Fence(int fenceFd) :
mFenceFd(fenceFd) {
}
Fence::~Fence() {
if (mFenceFd != -1) {
close(mFenceFd);
}
}
status_t Fence::wait(unsigned int timeout) {
ATRACE_CALL();
if (mFenceFd == -1) {
return NO_ERROR;
}
int err = sync_wait(mFenceFd, timeout);
return err < 0 ? -errno : status_t(NO_ERROR);
}
status_t Fence::waitForever(const char* logname) {
ATRACE_CALL();
if (mFenceFd == -1) {
return NO_ERROR;
}
unsigned int warningTimeout = 3000;
int err = sync_wait(mFenceFd, warningTimeout);
if (err < 0 && errno == ETIME) {
ALOGE("%s: fence %d didn't signal in %u ms", logname, mFenceFd,
warningTimeout);
err = sync_wait(mFenceFd, TIMEOUT_NEVER);
}
return err < 0 ? -errno : status_t(NO_ERROR);
}
sp<Fence> Fence::merge(const String8& name, const sp<Fence>& f1,
const sp<Fence>& f2) {
ATRACE_CALL();
int result;
// Merge the two fences. In the case where one of the fences is not a
// valid fence (e.g. NO_FENCE) we merge the one valid fence with itself so
// that a new fence with the given name is created.
if (f1->isValid() && f2->isValid()) {
result = sync_merge(name.string(), f1->mFenceFd, f2->mFenceFd);
} else if (f1->isValid()) {
result = sync_merge(name.string(), f1->mFenceFd, f1->mFenceFd);
} else if (f2->isValid()) {
result = sync_merge(name.string(), f2->mFenceFd, f2->mFenceFd);
} else {
return NO_FENCE;
}
if (result == -1) {
status_t err = -errno;
ALOGE("merge: sync_merge(\"%s\", %d, %d) returned an error: %s (%d)",
name.string(), f1->mFenceFd, f2->mFenceFd,
strerror(-err), err);
return NO_FENCE;
}
return sp<Fence>(new Fence(result));
}
int Fence::dup() const {
return ::dup(mFenceFd);
}
nsecs_t Fence::getSignalTime() const {
if (mFenceFd == -1) {
return -1;
}
struct sync_fence_info_data* finfo = sync_fence_info(mFenceFd);
if (finfo == NULL) {
ALOGE("sync_fence_info returned NULL for fd %d", mFenceFd);
return -1;
}
if (finfo->status != 1) {
sync_fence_info_free(finfo);
return INT64_MAX;
}
struct sync_pt_info* pinfo = NULL;
uint64_t timestamp = 0;
while ((pinfo = sync_pt_info(finfo, pinfo)) != NULL) {
if (pinfo->timestamp_ns > timestamp) {
timestamp = pinfo->timestamp_ns;
}
}
sync_fence_info_free(finfo);
return nsecs_t(timestamp);
}
size_t Fence::getFlattenedSize() const {
return 1;
}
size_t Fence::getFdCount() const {
return isValid() ? 1 : 0;
}
status_t Fence::flatten(void*& buffer, size_t& size, int*& fds, size_t& count) const {
if (size < getFlattenedSize() || count < getFdCount()) {
return NO_MEMORY;
}
FlattenableUtils::write(buffer, size, (uint32_t)getFdCount());
if (isValid()) {
*fds++ = mFenceFd;
count--;
}
return NO_ERROR;
}
status_t Fence::unflatten(void const*& buffer, size_t& size, int const*& fds, size_t& count) {
if (mFenceFd != -1) {
// Don't unflatten if we already have a valid fd.
return INVALID_OPERATION;
}
if (size < 1) {
return NO_MEMORY;
}
uint32_t numFds;
FlattenableUtils::read(buffer, size, numFds);
if (numFds > 1) {
return BAD_VALUE;
}
if (count < numFds) {
return NO_MEMORY;
}
if (numFds) {
mFenceFd = *fds++;
count--;
}
return NO_ERROR;
}
} // namespace android
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