f25e183a70
This change adds the Fence class to libui for to wrap the libsync functionality. Change-Id: I93a31baeee608b93c14da807a32013dabf783f84
96 lines
2.2 KiB
C++
96 lines
2.2 KiB
C++
/*
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* Copyright (C) 2012 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#define LOG_TAG "Fence"
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#define ATRACE_TAG ATRACE_TAG_GRAPHICS
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//#define LOG_NDEBUG 0
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#include <sync/sync.h>
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#include <ui/Fence.h>
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#include <unistd.h>
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#include <utils/Log.h>
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#include <utils/Trace.h>
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namespace android {
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Fence::Fence() :
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mFenceFd(-1) {
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}
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Fence::Fence(int fenceFd) :
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mFenceFd(fenceFd) {
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}
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Fence::~Fence() {
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if (mFenceFd != -1) {
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close(mFenceFd);
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}
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}
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int Fence::wait(unsigned int timeout) {
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ATRACE_CALL();
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if (mFenceFd == -1) {
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return NO_ERROR;
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}
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return sync_wait(mFenceFd, timeout);
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}
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sp<Fence> Fence::merge(const String8& name, const sp<Fence>& f1,
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const sp<Fence>& f2) {
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ATRACE_CALL();
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int result = sync_merge(name.string(), f1->mFenceFd, f2->mFenceFd);
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if (result == -1) {
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ALOGE("merge: sync_merge returned an error: %s (%d)", strerror(-errno),
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errno);
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return sp<Fence>();
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}
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return sp<Fence>(new Fence(result));
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}
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size_t Fence::getFlattenedSize() const {
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return 0;
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}
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size_t Fence::getFdCount() const {
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return 1;
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}
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status_t Fence::flatten(void* buffer, size_t size, int fds[],
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size_t count) const {
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if (size != 0 || count != 1) {
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return BAD_VALUE;
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}
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fds[0] = mFenceFd;
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return NO_ERROR;
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}
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status_t Fence::unflatten(void const* buffer, size_t size, int fds[],
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size_t count) {
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if (size != 0 || count != 1) {
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return BAD_VALUE;
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}
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if (mFenceFd != -1) {
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// Don't unflatten if we already have a valid fd.
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return INVALID_OPERATION;
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}
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mFenceFd = fds[0];
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return NO_ERROR;
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}
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} // namespace android
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