1 /*
2 * Copyright (C) 2016 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 "AAudioService"
18 //#define LOG_NDEBUG 0
19 #include <utils/Log.h>
20
21 #include <pthread.h>
22
23 #include <aaudio/AAudio.h>
24 #include <utility/AAudioUtilities.h>
25
26 #include "AAudioThread.h"
27
28 using namespace aaudio;
29
30
AAudioThread()31 AAudioThread::AAudioThread()
32 : mRunnable(nullptr)
33 , mHasThread(false) {
34 // mThread is a pthread_t of unknown size so we need memset().
35 memset(&mThread, 0, sizeof(mThread));
36 }
37
dispatch()38 void AAudioThread::dispatch() {
39 if (mRunnable != nullptr) {
40 mRunnable->run();
41 } else {
42 run();
43 }
44 }
45
46 // This is the entry point for the new thread created by createThread().
47 // It converts the 'C' function call to a C++ method call.
AAudioThread_internalThreadProc(void * arg)48 static void * AAudioThread_internalThreadProc(void *arg) {
49 AAudioThread *aaudioThread = (AAudioThread *) arg;
50 aaudioThread->dispatch();
51 return nullptr;
52 }
53
start(Runnable * runnable)54 aaudio_result_t AAudioThread::start(Runnable *runnable) {
55 if (mHasThread) {
56 ALOGE("AAudioThread::start() - mHasThread already true");
57 return AAUDIO_ERROR_INVALID_STATE;
58 }
59 // mRunnable will be read by the new thread when it starts.
60 // pthread_create() forces a memory synchronization so mRunnable does not need to be atomic.
61 mRunnable = runnable;
62 int err = pthread_create(&mThread, nullptr, AAudioThread_internalThreadProc, this);
63 if (err != 0) {
64 ALOGE("AAudioThread::start() - pthread_create() returned %d %s", err, strerror(err));
65 return AAudioConvert_androidToAAudioResult(-err);
66 } else {
67 mHasThread = true;
68 return AAUDIO_OK;
69 }
70 }
71
stop()72 aaudio_result_t AAudioThread::stop() {
73 if (!mHasThread) {
74 ALOGE("AAudioThread::stop() but no thread running");
75 return AAUDIO_ERROR_INVALID_STATE;
76 }
77 int err = pthread_join(mThread, nullptr);
78 mHasThread = false;
79 if (err != 0) {
80 ALOGE("AAudioThread::stop() - pthread_join() returned %d %s", err, strerror(err));
81 return AAudioConvert_androidToAAudioResult(-err);
82 } else {
83 return AAUDIO_OK;
84 }
85 }
86
87