1 /*
2 * Copyright (C) 2017 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 "chre/platform/linux/platform_log.h"
18
19 #include <cstdarg>
20 #include <cstdio>
21 #include <iostream>
22
23 #include "chre/platform/fatal_error.h"
24 #include "chre/platform/shared/bt_snoop_log.h"
25
chrePlatformBtSnoopLog(BtSnoopDirection,const uint8_t *,size_t)26 void chrePlatformBtSnoopLog(BtSnoopDirection /*direction*/,
27 const uint8_t * /*buffer*/, size_t /*size*/) {
28 // Unimplemented in this platform
29 }
30
31 namespace chre {
32
logLooper()33 void PlatformLog::logLooper() {
34 while (1) {
35 char *logMessage = nullptr;
36
37 {
38 std::unique_lock<std::mutex> lock(mMutex);
39 mConditionVariable.wait(
40 lock, [this] { return (!mLogQueue.empty() || mStopLogger); });
41
42 if (!mLogQueue.empty()) {
43 // Move the log message to avoid holding a lock for longer than
44 // required.
45 logMessage = mLogQueue.front();
46 mLogQueue.pop();
47 } else if (mStopLogger) {
48 // The stop logger is checked in an else-if to allow the main log queue
49 // to drain when the logger is stopping.
50 break;
51 }
52 }
53
54 // If we get here, there must be a log message to output. This is outside of
55 // the context of the lock which means that the logging thread will only be
56 // blocked for the minimum amount of time.
57 std::cerr << logMessage << std::endl;
58 free(logMessage);
59 }
60 }
61
PlatformLog()62 PlatformLog::PlatformLog() {
63 mLoggerThread = std::thread(&PlatformLog::logLooper, this);
64 }
65
~PlatformLog()66 PlatformLog::~PlatformLog() {
67 {
68 std::unique_lock<std::mutex> lock(mMutex);
69 mStopLogger = true;
70 mConditionVariable.notify_one();
71 }
72
73 mLoggerThread.join();
74 }
75
logVa(chreLogLevel,const char * formatStr,va_list args)76 void PlatformLog::logVa(chreLogLevel /*logLevel*/, const char *formatStr,
77 va_list args) {
78 char *formattedStr;
79 int result = vasprintf(&formattedStr, formatStr, args);
80
81 if (result >= 0) {
82 std::unique_lock<std::mutex> lock(mMutex);
83 mLogQueue.push(formattedStr);
84 mConditionVariable.notify_one();
85 } else {
86 FATAL_ERROR("Failed to allocate log message");
87 }
88 }
89
90 } // namespace chre
91