rsFifoSocket.cpp revision 11496ac131bb691edf5bdcab3029dceef5c1e4e1 
1/*
2 * Copyright (C) 2011 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#include "rsFifoSocket.h"
18
19#include <stdio.h>
20#include <stdlib.h>
21#include <ctype.h>
22#include <unistd.h>
23#include <poll.h>
24#include <sys/types.h>
25#include <sys/socket.h>
26
27namespace android {
28namespace renderscript {
29
30FifoSocket::FifoSocket() {
31    mShutdown = false;
32}
33
34FifoSocket::~FifoSocket() {
35
36}
37
38bool FifoSocket::init(bool supportNonBlocking, bool supportReturnValues, size_t maxDataSize) {
39    // TODO: (b/27870945) Handle socketpair errors.
40    int ret = socketpair(AF_UNIX, SOCK_STREAM, 0, sv);
41    return (ret == 0);
42}
43
44void FifoSocket::shutdown() {
45    mShutdown = true;
46    uint64_t d = 0;
47    ::send(sv[0], &d, sizeof(d), 0);
48    ::send(sv[1], &d, sizeof(d), 0);
49    close(sv[0]);
50    close(sv[1]);
51}
52
53bool FifoSocket::writeAsync(const void *data, size_t bytes, bool waitForSpace) {
54    if (bytes == 0) {
55        return true;
56    }
57    //ALOGE("writeAsync %p %i", data, bytes);
58    size_t ret = ::send(sv[0], data, bytes, 0);
59    rsAssert(ret == bytes);
60    if (ret != bytes) {
61        ALOGE("writeAsync %p %zu  ret %zu", data, bytes, ret);
62    }
63    return true;
64}
65
66void FifoSocket::writeWaitReturn(void *retData, size_t retBytes) {
67    if (mShutdown) {
68        return;
69    }
70
71    //ALOGE("writeWaitReturn %p %i", retData, retBytes);
72    size_t ret = ::recv(sv[0], retData, retBytes, MSG_WAITALL);
73    //ALOGE("writeWaitReturn %i", ret);
74    rsAssert(ret == retBytes);
75}
76
77size_t FifoSocket::read(void *data, size_t bytes) {
78    if (mShutdown) {
79        return 0;
80    }
81
82    //ALOGE("read %p %i", data, bytes);
83    size_t ret = ::recv(sv[1], data, bytes, MSG_WAITALL);
84    rsAssert(ret == bytes || mShutdown);
85    //ALOGE("read ret %i  bytes %i", ret, bytes);
86    if (mShutdown) {
87        ret = 0;
88    }
89    return ret;
90}
91
92bool FifoSocket::isEmpty() {
93    struct pollfd p;
94    p.fd = sv[1];
95    p.events = POLLIN;
96    int r = poll(&p, 1, 0);
97    //ALOGE("poll r=%i", r);
98    return r == 0;
99}
100
101
102void FifoSocket::readReturn(const void *data, size_t bytes) {
103    ::send(sv[1], data, bytes, 0);
104}
105
106} // namespace renderscript
107} // namespace android
108