1 /*
2 * Copyright 2020 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 <sched.h>
18 #include <cstring>
19
20 #include "AudioStreamGateway.h"
21 #include "common/OboeDebug.h"
22 #include "oboe/Oboe.h"
23 #include "OboeStreamCallbackProxy.h"
24 #include "OboeTesterStreamCallback.h"
25 #include "OboeTools.h"
26 #include "synth/IncludeMeOnce.h"
27
28 int32_t OboeTesterStreamCallback::mHangTimeMillis = 0;
29
30 // Print if scheduler changes.
printScheduler()31 void OboeTesterStreamCallback::printScheduler() {
32 #if OBOE_ENABLE_LOGGING
33 int scheduler = sched_getscheduler(gettid());
34 if (scheduler != mPreviousScheduler) {
35 int schedulerType = scheduler & 0xFFFF; // mask off high flags
36 LOGD("callback CPU scheduler = 0x%08x = %s",
37 scheduler,
38 ((schedulerType == SCHED_FIFO) ? "SCHED_FIFO" :
39 ((schedulerType == SCHED_OTHER) ? "SCHED_OTHER" :
40 ((schedulerType == SCHED_RR) ? "SCHED_RR" : "UNKNOWN")))
41 );
42 mPreviousScheduler = scheduler;
43 }
44 #endif
45 }
46
47 // Sleep to cause an XRun. Then reschedule.
maybeHang(const int64_t startNanos)48 void OboeTesterStreamCallback::maybeHang(const int64_t startNanos) {
49 if (mHangTimeMillis == 0) return;
50
51 if (startNanos > mNextTimeToHang) {
52 LOGD("%s() start sleeping", __func__);
53 // Take short naps until it is time to wake up.
54 int64_t nowNanos = startNanos;
55 int64_t wakeupNanos = startNanos + (mHangTimeMillis * NANOS_PER_MILLISECOND);
56 while (nowNanos < wakeupNanos && mHangTimeMillis > 0) {
57 int32_t sleepTimeMicros = (int32_t) ((wakeupNanos - nowNanos) / 1000);
58 if (sleepTimeMicros == 0) break;
59 // The usleep() function can fail if it sleeps for more than one second.
60 // So sleep for several small intervals.
61 // This also allows us to exit the loop if mHangTimeMillis gets set to zero.
62 const int32_t maxSleepTimeMicros = 100 * 1000;
63 sleepTimeMicros = std::min(maxSleepTimeMicros, sleepTimeMicros);
64 usleep(sleepTimeMicros);
65 nowNanos = getNanoseconds();
66 }
67 // Calculate when we hang again.
68 const int32_t minDurationMillis = 500;
69 const int32_t maxDurationMillis = std::max(10000, mHangTimeMillis * 2);
70 int32_t durationMillis = mHangTimeMillis * 10;
71 durationMillis = std::max(minDurationMillis, std::min(maxDurationMillis, durationMillis));
72 mNextTimeToHang = startNanos + (durationMillis * NANOS_PER_MILLISECOND);
73 LOGD("%s() slept for %d msec, durationMillis = %d", __func__,
74 (int)((nowNanos - startNanos) / 1e6L),
75 durationMillis);
76 }
77 }
78
getNanoseconds(clockid_t clockId)79 int64_t OboeTesterStreamCallback::getNanoseconds(clockid_t clockId) {
80 struct timespec time;
81 int result = clock_gettime(clockId, &time);
82 if (result < 0) {
83 return result;
84 }
85 return (time.tv_sec * 1e9) + time.tv_nsec;
86 }