Fence.h revision 5736f7dc1535452799ef2ea2026b7d1465567a31
1f25e183a70bd631f75dce51e85b7d568472a0cdbJamie Gennis/* 2f25e183a70bd631f75dce51e85b7d568472a0cdbJamie Gennis * Copyright (C) 2012 The Android Open Source Project 3f25e183a70bd631f75dce51e85b7d568472a0cdbJamie Gennis * 4f25e183a70bd631f75dce51e85b7d568472a0cdbJamie Gennis * Licensed under the Apache License, Version 2.0 (the "License"); 5f25e183a70bd631f75dce51e85b7d568472a0cdbJamie Gennis * you may not use this file except in compliance with the License. 6f25e183a70bd631f75dce51e85b7d568472a0cdbJamie Gennis * You may obtain a copy of the License at 7f25e183a70bd631f75dce51e85b7d568472a0cdbJamie Gennis * 8f25e183a70bd631f75dce51e85b7d568472a0cdbJamie Gennis * http://www.apache.org/licenses/LICENSE-2.0 9f25e183a70bd631f75dce51e85b7d568472a0cdbJamie Gennis * 10f25e183a70bd631f75dce51e85b7d568472a0cdbJamie Gennis * Unless required by applicable law or agreed to in writing, software 11f25e183a70bd631f75dce51e85b7d568472a0cdbJamie Gennis * distributed under the License is distributed on an "AS IS" BASIS, 12f25e183a70bd631f75dce51e85b7d568472a0cdbJamie Gennis * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13f25e183a70bd631f75dce51e85b7d568472a0cdbJamie Gennis * See the License for the specific language governing permissions and 14f25e183a70bd631f75dce51e85b7d568472a0cdbJamie Gennis * limitations under the License. 15f25e183a70bd631f75dce51e85b7d568472a0cdbJamie Gennis */ 16f25e183a70bd631f75dce51e85b7d568472a0cdbJamie Gennis 17f25e183a70bd631f75dce51e85b7d568472a0cdbJamie Gennis#ifndef ANDROID_FENCE_H 18f25e183a70bd631f75dce51e85b7d568472a0cdbJamie Gennis#define ANDROID_FENCE_H 19f25e183a70bd631f75dce51e85b7d568472a0cdbJamie Gennis 20f25e183a70bd631f75dce51e85b7d568472a0cdbJamie Gennis#include <stdint.h> 21f25e183a70bd631f75dce51e85b7d568472a0cdbJamie Gennis#include <sys/types.h> 22f25e183a70bd631f75dce51e85b7d568472a0cdbJamie Gennis 23f25e183a70bd631f75dce51e85b7d568472a0cdbJamie Gennis#include <ui/ANativeObjectBase.h> 24f25e183a70bd631f75dce51e85b7d568472a0cdbJamie Gennis#include <ui/PixelFormat.h> 25f25e183a70bd631f75dce51e85b7d568472a0cdbJamie Gennis#include <ui/Rect.h> 26f25e183a70bd631f75dce51e85b7d568472a0cdbJamie Gennis#include <utils/Flattenable.h> 27f25e183a70bd631f75dce51e85b7d568472a0cdbJamie Gennis#include <utils/String8.h> 2882dbc7429f5f9f2b303b31dc5b9f2bfd1bbe6addJamie Gennis#include <utils/Timers.h> 29f25e183a70bd631f75dce51e85b7d568472a0cdbJamie Gennis 30f25e183a70bd631f75dce51e85b7d568472a0cdbJamie Gennisstruct ANativeWindowBuffer; 31f25e183a70bd631f75dce51e85b7d568472a0cdbJamie Gennis 32f25e183a70bd631f75dce51e85b7d568472a0cdbJamie Gennisnamespace android { 33f25e183a70bd631f75dce51e85b7d568472a0cdbJamie Gennis 34f25e183a70bd631f75dce51e85b7d568472a0cdbJamie Gennis// =========================================================================== 35f25e183a70bd631f75dce51e85b7d568472a0cdbJamie Gennis// Fence 36f25e183a70bd631f75dce51e85b7d568472a0cdbJamie Gennis// =========================================================================== 37f25e183a70bd631f75dce51e85b7d568472a0cdbJamie Gennis 38f25e183a70bd631f75dce51e85b7d568472a0cdbJamie Gennisclass Fence 39e142428a9c8b9d2380032cd4d7b55ee440fe8770Mathias Agopian : public LightRefBase<Fence>, public Flattenable<Fence> 40f25e183a70bd631f75dce51e85b7d568472a0cdbJamie Gennis{ 41f25e183a70bd631f75dce51e85b7d568472a0cdbJamie Gennispublic: 42ef19414bd8b77a26f5751f3845be79025a8263feJesse Hall static const sp<Fence> NO_FENCE; 43f25e183a70bd631f75dce51e85b7d568472a0cdbJamie Gennis 4482dbc7429f5f9f2b303b31dc5b9f2bfd1bbe6addJamie Gennis // TIMEOUT_NEVER may be passed to the wait method to indicate that it 4582dbc7429f5f9f2b303b31dc5b9f2bfd1bbe6addJamie Gennis // should wait indefinitely for the fence to signal. 4682dbc7429f5f9f2b303b31dc5b9f2bfd1bbe6addJamie Gennis enum { TIMEOUT_NEVER = -1 }; 4782dbc7429f5f9f2b303b31dc5b9f2bfd1bbe6addJamie Gennis 48f25e183a70bd631f75dce51e85b7d568472a0cdbJamie Gennis // Construct a new Fence object with an invalid file descriptor. This 49f25e183a70bd631f75dce51e85b7d568472a0cdbJamie Gennis // should be done when the Fence object will be set up by unflattening 50f25e183a70bd631f75dce51e85b7d568472a0cdbJamie Gennis // serialized data. 51f25e183a70bd631f75dce51e85b7d568472a0cdbJamie Gennis Fence(); 52f25e183a70bd631f75dce51e85b7d568472a0cdbJamie Gennis 53f25e183a70bd631f75dce51e85b7d568472a0cdbJamie Gennis // Construct a new Fence object to manage a given fence file descriptor. 54f25e183a70bd631f75dce51e85b7d568472a0cdbJamie Gennis // When the new Fence object is destructed the file descriptor will be 55f25e183a70bd631f75dce51e85b7d568472a0cdbJamie Gennis // closed. 56f25e183a70bd631f75dce51e85b7d568472a0cdbJamie Gennis Fence(int fenceFd); 57f25e183a70bd631f75dce51e85b7d568472a0cdbJamie Gennis 58c777b0b3b9b0ea5d8e378fccde6935765e28e329Jesse Hall // Check whether the Fence has an open fence file descriptor. Most Fence 59c777b0b3b9b0ea5d8e378fccde6935765e28e329Jesse Hall // methods treat an invalid file descriptor just like a valid fence that 60c777b0b3b9b0ea5d8e378fccde6935765e28e329Jesse Hall // is already signalled, so using this is usually not necessary. 61c777b0b3b9b0ea5d8e378fccde6935765e28e329Jesse Hall bool isValid() const { return mFenceFd != -1; } 62c777b0b3b9b0ea5d8e378fccde6935765e28e329Jesse Hall 63f25e183a70bd631f75dce51e85b7d568472a0cdbJamie Gennis // wait waits for up to timeout milliseconds for the fence to signal. If 64f25e183a70bd631f75dce51e85b7d568472a0cdbJamie Gennis // the fence signals then NO_ERROR is returned. If the timeout expires 65f25e183a70bd631f75dce51e85b7d568472a0cdbJamie Gennis // before the fence signals then -ETIME is returned. A timeout of 66f25e183a70bd631f75dce51e85b7d568472a0cdbJamie Gennis // TIMEOUT_NEVER may be used to indicate that the call should wait 67f25e183a70bd631f75dce51e85b7d568472a0cdbJamie Gennis // indefinitely for the fence to signal. 68303b9a51239d36d237a7d40c67b5085cdb3c1059Dan Stoza status_t wait(int timeout); 69f25e183a70bd631f75dce51e85b7d568472a0cdbJamie Gennis 70ba607d53c6a94ea8c4c12571980c4ad159af308bJesse Hall // waitForever is a convenience function for waiting forever for a fence to 71ba607d53c6a94ea8c4c12571980c4ad159af308bJesse Hall // signal (just like wait(TIMEOUT_NEVER)), but issuing an error to the 72ba607d53c6a94ea8c4c12571980c4ad159af308bJesse Hall // system log and fence state to the kernel log if the wait lasts longer 73ea74d3b78d607cde17790a7bb83e6f68ffd34cfdMathias Agopian // than a warning timeout. 74ea74d3b78d607cde17790a7bb83e6f68ffd34cfdMathias Agopian // The logname argument should be a string identifying 75ba607d53c6a94ea8c4c12571980c4ad159af308bJesse Hall // the caller and will be included in the log message. 76ea74d3b78d607cde17790a7bb83e6f68ffd34cfdMathias Agopian status_t waitForever(const char* logname); 77ba607d53c6a94ea8c4c12571980c4ad159af308bJesse Hall 78f25e183a70bd631f75dce51e85b7d568472a0cdbJamie Gennis // merge combines two Fence objects, creating a new Fence object that 79f25e183a70bd631f75dce51e85b7d568472a0cdbJamie Gennis // becomes signaled when both f1 and f2 are signaled (even if f1 or f2 is 80f25e183a70bd631f75dce51e85b7d568472a0cdbJamie Gennis // destroyed before it becomes signaled). The name argument specifies the 81f25e183a70bd631f75dce51e85b7d568472a0cdbJamie Gennis // human-readable name to associated with the new Fence object. 82fd4c8c38051f9dad028e4e43e0eb39ba412b2c0aMatthew Bouyack static sp<Fence> merge(const char* name, const sp<Fence>& f1, 83fd4c8c38051f9dad028e4e43e0eb39ba412b2c0aMatthew Bouyack const sp<Fence>& f2); 84fd4c8c38051f9dad028e4e43e0eb39ba412b2c0aMatthew Bouyack 85f25e183a70bd631f75dce51e85b7d568472a0cdbJamie Gennis static sp<Fence> merge(const String8& name, const sp<Fence>& f1, 86f25e183a70bd631f75dce51e85b7d568472a0cdbJamie Gennis const sp<Fence>& f2); 87f25e183a70bd631f75dce51e85b7d568472a0cdbJamie Gennis 88f9783af225aa3b41ec0af36f90941a714269abb7Jesse Hall // Return a duplicate of the fence file descriptor. The caller is 89f9783af225aa3b41ec0af36f90941a714269abb7Jesse Hall // responsible for closing the returned file descriptor. On error, -1 will 90f9783af225aa3b41ec0af36f90941a714269abb7Jesse Hall // be returned and errno will indicate the problem. 91f9783af225aa3b41ec0af36f90941a714269abb7Jesse Hall int dup() const; 92f9783af225aa3b41ec0af36f90941a714269abb7Jesse Hall 9382dbc7429f5f9f2b303b31dc5b9f2bfd1bbe6addJamie Gennis // getSignalTime returns the system monotonic clock time at which the 9482dbc7429f5f9f2b303b31dc5b9f2bfd1bbe6addJamie Gennis // fence transitioned to the signaled state. If the fence is not signaled 9582dbc7429f5f9f2b303b31dc5b9f2bfd1bbe6addJamie Gennis // then INT64_MAX is returned. If the fence is invalid or if an error 9682dbc7429f5f9f2b303b31dc5b9f2bfd1bbe6addJamie Gennis // occurs then -1 is returned. 9782dbc7429f5f9f2b303b31dc5b9f2bfd1bbe6addJamie Gennis nsecs_t getSignalTime() const; 9882dbc7429f5f9f2b303b31dc5b9f2bfd1bbe6addJamie Gennis 995736f7dc1535452799ef2ea2026b7d1465567a31Dan Stoza // hasSignaled returns whether the fence has signaled yet. Prefer this to 1005736f7dc1535452799ef2ea2026b7d1465567a31Dan Stoza // getSignalTime() or wait() if all you care about is whether the fence has 1015736f7dc1535452799ef2ea2026b7d1465567a31Dan Stoza // signaled. 1025736f7dc1535452799ef2ea2026b7d1465567a31Dan Stoza inline bool hasSignaled() { 1035736f7dc1535452799ef2ea2026b7d1465567a31Dan Stoza // The sync_wait call underlying wait() has been measured to be 1045736f7dc1535452799ef2ea2026b7d1465567a31Dan Stoza // significantly faster than the sync_fence_info call underlying 1055736f7dc1535452799ef2ea2026b7d1465567a31Dan Stoza // getSignalTime(), which might otherwise appear to be the more obvious 1065736f7dc1535452799ef2ea2026b7d1465567a31Dan Stoza // way to check whether a fence has signaled. 1075736f7dc1535452799ef2ea2026b7d1465567a31Dan Stoza return wait(0) == NO_ERROR; 1085736f7dc1535452799ef2ea2026b7d1465567a31Dan Stoza } 1095736f7dc1535452799ef2ea2026b7d1465567a31Dan Stoza 110f25e183a70bd631f75dce51e85b7d568472a0cdbJamie Gennis // Flattenable interface 111f25e183a70bd631f75dce51e85b7d568472a0cdbJamie Gennis size_t getFlattenedSize() const; 112f25e183a70bd631f75dce51e85b7d568472a0cdbJamie Gennis size_t getFdCount() const; 113e142428a9c8b9d2380032cd4d7b55ee440fe8770Mathias Agopian status_t flatten(void*& buffer, size_t& size, int*& fds, size_t& count) const; 114e142428a9c8b9d2380032cd4d7b55ee440fe8770Mathias Agopian status_t unflatten(void const*& buffer, size_t& size, int const*& fds, size_t& count); 115f25e183a70bd631f75dce51e85b7d568472a0cdbJamie Gennis 116f25e183a70bd631f75dce51e85b7d568472a0cdbJamie Gennisprivate: 117f25e183a70bd631f75dce51e85b7d568472a0cdbJamie Gennis // Only allow instantiation using ref counting. 118f25e183a70bd631f75dce51e85b7d568472a0cdbJamie Gennis friend class LightRefBase<Fence>; 119e142428a9c8b9d2380032cd4d7b55ee440fe8770Mathias Agopian ~Fence(); 120f25e183a70bd631f75dce51e85b7d568472a0cdbJamie Gennis 121f25e183a70bd631f75dce51e85b7d568472a0cdbJamie Gennis // Disallow copying 122f25e183a70bd631f75dce51e85b7d568472a0cdbJamie Gennis Fence(const Fence& rhs); 123f25e183a70bd631f75dce51e85b7d568472a0cdbJamie Gennis Fence& operator = (const Fence& rhs); 124f25e183a70bd631f75dce51e85b7d568472a0cdbJamie Gennis const Fence& operator = (const Fence& rhs) const; 125f25e183a70bd631f75dce51e85b7d568472a0cdbJamie Gennis 126f25e183a70bd631f75dce51e85b7d568472a0cdbJamie Gennis int mFenceFd; 127f25e183a70bd631f75dce51e85b7d568472a0cdbJamie Gennis}; 128f25e183a70bd631f75dce51e85b7d568472a0cdbJamie Gennis 129f25e183a70bd631f75dce51e85b7d568472a0cdbJamie Gennis}; // namespace android 130f25e183a70bd631f75dce51e85b7d568472a0cdbJamie Gennis 131f25e183a70bd631f75dce51e85b7d568472a0cdbJamie Gennis#endif // ANDROID_FENCE_H 132