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