Fence.cpp revision ba607d53c6a94ea8c4c12571980c4ad159af308b
1/* 2 * Copyright (C) 2012 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#define LOG_TAG "Fence" 18#define ATRACE_TAG ATRACE_TAG_GRAPHICS 19//#define LOG_NDEBUG 0 20 21#include <sync/sync.h> 22#include <ui/Fence.h> 23#include <unistd.h> 24#include <utils/Log.h> 25#include <utils/Trace.h> 26 27namespace android { 28 29const sp<Fence> Fence::NO_FENCE = sp<Fence>(); 30 31Fence::Fence() : 32 mFenceFd(-1) { 33} 34 35Fence::Fence(int fenceFd) : 36 mFenceFd(fenceFd) { 37} 38 39Fence::~Fence() { 40 if (mFenceFd != -1) { 41 close(mFenceFd); 42 } 43} 44 45int Fence::wait(unsigned int timeout) { 46 ATRACE_CALL(); 47 if (mFenceFd == -1) { 48 return NO_ERROR; 49 } 50 return sync_wait(mFenceFd, timeout); 51} 52 53int Fence::waitForever(unsigned int warningTimeout, const char* logname) { 54 ATRACE_CALL(); 55 if (mFenceFd == -1) { 56 return NO_ERROR; 57 } 58 int err = sync_wait(mFenceFd, warningTimeout); 59 if (err == -ETIME) { 60 ALOGE("%s: fence %d didn't signal in %u ms", logname, mFenceFd, 61 warningTimeout); 62 err = sync_wait(mFenceFd, TIMEOUT_NEVER); 63 } 64 return err; 65} 66 67sp<Fence> Fence::merge(const String8& name, const sp<Fence>& f1, 68 const sp<Fence>& f2) { 69 ATRACE_CALL(); 70 int result = sync_merge(name.string(), f1->mFenceFd, f2->mFenceFd); 71 if (result == -1) { 72 status_t err = -errno; 73 ALOGE("merge: sync_merge(\"%s\", %d, %d) returned an error: %s (%d)", 74 name.string(), f1->mFenceFd, f2->mFenceFd, 75 strerror(-err), err); 76 return NO_FENCE; 77 } 78 return sp<Fence>(new Fence(result)); 79} 80 81int Fence::dup() const { 82 if (mFenceFd == -1) { 83 return -1; 84 } 85 return ::dup(mFenceFd); 86} 87 88size_t Fence::getFlattenedSize() const { 89 return 0; 90} 91 92size_t Fence::getFdCount() const { 93 return 1; 94} 95 96status_t Fence::flatten(void* buffer, size_t size, int fds[], 97 size_t count) const { 98 if (size != 0 || count != 1) { 99 return BAD_VALUE; 100 } 101 102 fds[0] = mFenceFd; 103 return NO_ERROR; 104} 105 106status_t Fence::unflatten(void const* buffer, size_t size, int fds[], 107 size_t count) { 108 if (size != 0 || count != 1) { 109 return BAD_VALUE; 110 } 111 if (mFenceFd != -1) { 112 // Don't unflatten if we already have a valid fd. 113 return INVALID_OPERATION; 114 } 115 116 mFenceFd = fds[0]; 117 return NO_ERROR; 118} 119 120} // namespace android 121