| Fedor Kudasov | 15e58b4 | 2019-07-04 17:52:39 +0100 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2019 The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | #ifndef ANDROID_FENCE_H |
| 18 | #define ANDROID_FENCE_H |
| 19 | |
| 20 | #include <utils/String8.h> |
| 21 | #include <utils/RefBase.h> |
| 22 | |
| 23 | typedef int64_t nsecs_t; |
| 24 | |
| 25 | namespace android { |
| 26 | |
| 27 | class Fence : public LightRefBase<Fence> { |
| 28 | public: |
| 29 | Fence() { } |
| 30 | Fence(int) { } |
| 31 | static const sp<Fence> NO_FENCE; |
| 32 | static constexpr nsecs_t SIGNAL_TIME_PENDING = INT64_MAX; |
| 33 | static constexpr nsecs_t SIGNAL_TIME_INVALID = -1; |
| 34 | static sp<Fence> merge(const char* name, const sp<Fence>& f1, const sp<Fence>& f2) { |
| 35 | return NO_FENCE; |
| 36 | } |
| 37 | |
| 38 | static sp<Fence> merge(const String8& name, const sp<Fence>& f1, const sp<Fence>& f2) { |
| 39 | return NO_FENCE; |
| 40 | } |
| 41 | |
| 42 | enum class Status { |
| 43 | Invalid, // Fence is invalid |
| 44 | Unsignaled, // Fence is valid but has not yet signaled |
| 45 | Signaled, // Fence is valid and has signaled |
| 46 | }; |
| 47 | |
| 48 | status_t wait(int timeout) { return OK; } |
| 49 | |
| 50 | status_t waitForever(const char* logname) { return OK; } |
| 51 | |
| 52 | int dup() const { return 0; } |
| 53 | |
| 54 | inline Status getStatus() { |
| 55 | // The sync_wait call underlying wait() has been measured to be |
| 56 | // significantly faster than the sync_fence_info call underlying |
| 57 | // getSignalTime(), which might otherwise appear to be the more obvious |
| 58 | // way to check whether a fence has signaled. |
| 59 | switch (wait(0)) { |
| 60 | case NO_ERROR: |
| 61 | return Status::Signaled; |
| 62 | case -ETIME: |
| 63 | return Status::Unsignaled; |
| 64 | default: |
| 65 | return Status::Invalid; |
| 66 | } |
| 67 | } |
| 68 | }; |
| 69 | |
| 70 | } // namespace android |
| 71 | |
| 72 | #endif // ANDROID_FENCE_H |