replicant-frameworks_native/libs/ui/Fence.cpp
Dan Stoza 6fbefbbd8e libui: Clean up Fence and Region flattening
Fence was flattening incorrectly, causing issues with any fields
flattened after it, and Region was relying on being the last object
flattened. This change addresses both.

Change-Id: If49de061de6e2f11f4d846b4d8c18627dfb7e109
2015-04-15 13:04:15 -07:00

184 lines
4.8 KiB
C++

/*
* 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
// We would eliminate the non-conforming zero-length array, but we can't since
// this is effectively included from the Linux kernel
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wzero-length-array"
#include <sync/sync.h>
#pragma clang diagnostic pop
#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(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;
}
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 4;
}
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;
}
// Cast to uint32_t since the size of a size_t can vary between 32- and
// 64-bit processes
FlattenableUtils::write(buffer, size, static_cast<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