113 lines
4.7 KiB
C++
113 lines
4.7 KiB
C++
/*
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* Copyright (C) 2012-2013 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#pragma once
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#include <pthread.h>
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#include <sys/socket.h>
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#include <sys/types.h>
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#include <time.h>
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#include <chrono>
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#include <condition_variable>
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#include <list>
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#include <memory>
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#include <android-base/thread_annotations.h>
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#include <log/log.h>
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#include "LogBuffer.h"
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#include "LogWriter.h"
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#include "LogdLock.h"
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class LogReaderList;
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class LogReaderThread {
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public:
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LogReaderThread(LogBuffer* log_buffer, LogReaderList* reader_list,
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std::unique_ptr<LogWriter> writer, bool non_block, unsigned long tail,
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LogMask log_mask, pid_t pid, log_time start_time, uint64_t sequence,
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std::chrono::steady_clock::time_point deadline);
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void TriggerReader() REQUIRES(logd_lock) { thread_triggered_condition_.notify_all(); }
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void TriggerSkip(log_id_t id, unsigned int skip) REQUIRES(logd_lock) { skip_ahead_[id] = skip; }
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void CleanSkip() REQUIRES(logd_lock) { memset(skip_ahead_, 0, sizeof(skip_ahead_)); }
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void Release() REQUIRES(logd_lock) {
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// gracefully shut down the socket.
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writer_->Shutdown();
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release_ = true;
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thread_triggered_condition_.notify_all();
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}
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bool IsWatching(log_id_t id) const REQUIRES(logd_lock) {
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return flush_to_state_->log_mask() & (1 << id);
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}
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bool IsWatchingMultiple(LogMask log_mask) const REQUIRES(logd_lock) {
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return flush_to_state_->log_mask() & log_mask;
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}
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std::string name() const REQUIRES(logd_lock) { return writer_->name(); }
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uint64_t start() const REQUIRES(logd_lock) { return flush_to_state_->start(); }
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std::chrono::steady_clock::time_point deadline() const REQUIRES(logd_lock) { return deadline_; }
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FlushToState& flush_to_state() REQUIRES(logd_lock) { return *flush_to_state_; }
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private:
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void ThreadFunction();
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// flushTo filter callbacks
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FilterResult FilterFirstPass(log_id_t log_id, pid_t pid, uint64_t sequence, log_time realtime)
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REQUIRES(logd_lock);
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FilterResult FilterSecondPass(log_id_t log_id, pid_t pid, uint64_t sequence, log_time realtime)
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REQUIRES(logd_lock);
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std::condition_variable thread_triggered_condition_;
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LogBuffer* log_buffer_;
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LogReaderList* reader_list_;
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std::unique_ptr<LogWriter> writer_ GUARDED_BY(logd_lock);
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// Set to true to cause the thread to end and the LogReaderThread to delete itself.
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bool release_ GUARDED_BY(logd_lock) = false;
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// If set to non-zero, only pids equal to this are read by the reader.
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const pid_t pid_;
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// When a reader is referencing (via start_) old elements in the log buffer, and the log
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// buffer's size grows past its memory limit, the log buffer may request the reader to skip
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// ahead a specified number of logs.
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unsigned int skip_ahead_[LOG_ID_MAX] GUARDED_BY(logd_lock);
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// LogBuffer::FlushTo() needs to store state across subsequent calls.
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std::unique_ptr<FlushToState> flush_to_state_ GUARDED_BY(logd_lock);
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// These next three variables are used for reading only the most recent lines aka `adb logcat
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// -t` / `adb logcat -T`.
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// tail_ is the number of most recent lines to print.
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unsigned long tail_;
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// count_ is the result of a first pass through the log buffer to determine how many total
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// messages there are.
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unsigned long count_;
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// index_ is used along with count_ to only start sending lines once index_ > (count_ - tail_)
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// and to disconnect the reader (if it is dumpAndClose, `adb logcat -t`), when index_ >= count_.
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unsigned long index_;
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// When a reader requests logs starting from a given timestamp, its stored here for the first
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// pass, such that logs before this time stamp that are accumulated in the buffer are ignored.
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log_time start_time_;
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// CLOCK_MONOTONIC based deadline used for log wrapping. If this deadline expires before logs
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// wrap, then wake up and send the logs to the reader anyway.
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std::chrono::steady_clock::time_point deadline_ GUARDED_BY(logd_lock);
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// If this reader is 'dumpAndClose' and will disconnect once it has read its intended logs.
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const bool non_block_;
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};
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