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/*
* Copyright (C) 2019 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.
*/
#ifndef ANDROID_FENCE_H
#define ANDROID_FENCE_H
#include <utils/String8.h>
#include <utils/RefBase.h>
typedef int64_t nsecs_t;
namespace android {
class Fence : public LightRefBase<Fence> {
public:
Fence() { }
Fence(int) { }
static const sp<Fence> NO_FENCE;
static constexpr nsecs_t SIGNAL_TIME_PENDING = INT64_MAX;
static constexpr nsecs_t SIGNAL_TIME_INVALID = -1;
static sp<Fence> merge(const char* name, const sp<Fence>& f1, const sp<Fence>& f2) {
return NO_FENCE;
}
static sp<Fence> merge(const String8& name, const sp<Fence>& f1, const sp<Fence>& f2) {
return NO_FENCE;
}
enum class Status {
Invalid, // Fence is invalid
Unsignaled, // Fence is valid but has not yet signaled
Signaled, // Fence is valid and has signaled
};
status_t wait(int timeout) { return OK; }
status_t waitForever(const char* logname) { return OK; }
int dup() const { return 0; }
inline Status getStatus() {
// The sync_wait call underlying wait() has been measured to be
// significantly faster than the sync_fence_info call underlying
// getSignalTime(), which might otherwise appear to be the more obvious
// way to check whether a fence has signaled.
switch (wait(0)) {
case NO_ERROR:
return Status::Signaled;
case -ETIME:
return Status::Unsignaled;
default:
return Status::Invalid;
}
}
};
} // namespace android
#endif // ANDROID_FENCE_H
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