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/*
* Copyright (C) 2008 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 "SurfaceFlingerSynchro"
#include <stdint.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <limits.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <binder/IPCThreadState.h>
#include <utils/Log.h>
#include <private/ui/SurfaceFlingerSynchro.h>
namespace android {
// ---------------------------------------------------------------------------
SurfaceFlingerSynchro::Barrier::Barrier()
: state(CLOSED) {
}
SurfaceFlingerSynchro::Barrier::~Barrier() {
}
void SurfaceFlingerSynchro::Barrier::open() {
asm volatile ("":::"memory");
Mutex::Autolock _l(lock);
state = OPENED;
cv.broadcast();
}
void SurfaceFlingerSynchro::Barrier::close() {
Mutex::Autolock _l(lock);
state = CLOSED;
}
void SurfaceFlingerSynchro::Barrier::waitAndClose()
{
Mutex::Autolock _l(lock);
while (state == CLOSED) {
// we're about to wait, flush the binder command buffer
IPCThreadState::self()->flushCommands();
cv.wait(lock);
}
state = CLOSED;
}
status_t SurfaceFlingerSynchro::Barrier::waitAndClose(nsecs_t timeout)
{
Mutex::Autolock _l(lock);
while (state == CLOSED) {
// we're about to wait, flush the binder command buffer
IPCThreadState::self()->flushCommands();
int err = cv.waitRelative(lock, timeout);
if (err != 0)
return err;
}
state = CLOSED;
return NO_ERROR;
}
// ---------------------------------------------------------------------------
SurfaceFlingerSynchro::SurfaceFlingerSynchro(const sp<ISurfaceComposer>& flinger)
: mSurfaceComposer(flinger)
{
}
SurfaceFlingerSynchro::SurfaceFlingerSynchro()
{
}
SurfaceFlingerSynchro::~SurfaceFlingerSynchro()
{
}
status_t SurfaceFlingerSynchro::signal()
{
mSurfaceComposer->signal();
return NO_ERROR;
}
status_t SurfaceFlingerSynchro::wait()
{
mBarrier.waitAndClose();
return NO_ERROR;
}
status_t SurfaceFlingerSynchro::wait(nsecs_t timeout)
{
if (timeout == 0)
return SurfaceFlingerSynchro::wait();
return mBarrier.waitAndClose(timeout);
}
void SurfaceFlingerSynchro::open()
{
mBarrier.open();
}
// ---------------------------------------------------------------------------
}; // namespace android
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