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 45status_t Fence::wait(unsigned int timeout) { 46 ATRACE_CALL(); 47 if (mFenceFd == -1) { 48 return NO_ERROR; 49 } 50 int err = sync_wait(mFenceFd, timeout); 51 return err < 0 ? -errno : status_t(NO_ERROR); 52} 53 54status_t Fence::waitForever(unsigned int warningTimeout, const char* logname) { 55 ATRACE_CALL(); 56 if (mFenceFd == -1) { 57 return NO_ERROR; 58 } 59 int err = sync_wait(mFenceFd, warningTimeout); 60 if (err < 0 && errno == ETIME) { 61 ALOGE("%s: fence %d didn't signal in %u ms", logname, mFenceFd, 62 warningTimeout); 63 err = sync_wait(mFenceFd, TIMEOUT_NEVER); 64 } 65 return err < 0 ? -errno : status_t(NO_ERROR); 66} 67 68sp<Fence> Fence::merge(const String8& name, const sp<Fence>& f1, 69 const sp<Fence>& f2) { 70 ATRACE_CALL(); 71 int result = sync_merge(name.string(), f1->mFenceFd, f2->mFenceFd); 72 if (result == -1) { 73 status_t err = -errno; 74 ALOGE("merge: sync_merge(\"%s\", %d, %d) returned an error: %s (%d)", 75 name.string(), f1->mFenceFd, f2->mFenceFd, 76 strerror(-err), err); 77 return NO_FENCE; 78 } 79 return sp<Fence>(new Fence(result)); 80} 81 82int Fence::dup() const { 83 if (mFenceFd == -1) { 84 return -1; 85 } 86 return ::dup(mFenceFd); 87} 88 89size_t Fence::getFlattenedSize() const { 90 return 0; 91} 92 93size_t Fence::getFdCount() const { 94 return 1; 95} 96 97status_t Fence::flatten(void* buffer, size_t size, int fds[], 98 size_t count) const { 99 if (size != 0 || count != 1) { 100 return BAD_VALUE; 101 } 102 103 fds[0] = mFenceFd; 104 return NO_ERROR; 105} 106 107status_t Fence::unflatten(void const* buffer, size_t size, int fds[], 108 size_t count) { 109 if (size != 0 || count != 1) { 110 return BAD_VALUE; 111 } 112 if (mFenceFd != -1) { 113 // Don't unflatten if we already have a valid fd. 114 return INVALID_OPERATION; 115 } 116 117 mFenceFd = fds[0]; 118 return NO_ERROR; 119} 120 121} // namespace android 122