92 lines
3.2 KiB
C++
92 lines
3.2 KiB
C++
/*
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* Copyright (C) 2021 Amlogic Corporation.
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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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#ifndef _TOOS_THREAD_H_
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#define _TOOS_THREAD_H_
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#include <stdio.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <pthread.h>
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#include "Mutex.h"
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#include "Condition.h"
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typedef void* (*pthread_entry_func)(void*);
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#define MAX_THREAD_NAME_LEN 16
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namespace ATools {
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class Thread
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{
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public:
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explicit Thread();
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virtual ~Thread();
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// Start the thread in threadLoop() which needs to be implemented.
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virtual int run(const char *name);
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// Good place to do one-time initializations
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virtual void readyToRun();
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// Good place to do one-time exit
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virtual void readyToExit();
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// Ask this object's thread to exit. This function is asynchronous, when the
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// function returns the thread might still be running. Of course, this
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// function can be called from a different thread.
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virtual void requestExit();
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// Call requestExit() and wait until this object's thread exits.
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// BE VERY CAREFUL of deadlocks. In particular, it would be silly to call
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// this function from this object's thread. Will return WOULD_BLOCK in
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// that case.
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int requestExitAndWait();
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// Wait until this object's thread exits. Returns immediately if not yet running.
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// Do not call from this object's thread; will return WOULD_BLOCK in that case.
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int join();
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// Indicates whether this thread is running or not.
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bool isRunning() const;
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//set thread priority from 1 ~ 99, this will set
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//thread policy to SCHED_RR,this api must be called before
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//calling run api
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void setThreadPriority(int priority);
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protected:
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// isExitPending() returns true if requestExit() has been called.
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bool isExitPending() const;
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private:
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// Derived class must implement threadLoop(). The thread starts its life
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// here. There are two ways of using the Thread object:
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// 1) loop: if threadLoop() returns true, it will be called again if
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// requestExit() wasn't called.
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// 2) once: if threadLoop() returns false, the thread will exit upon return.
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virtual bool threadLoop() = 0;
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private:
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Thread& operator=(const Thread&);
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static void* _threadLoop(void* user);
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int _createThread(pthread_entry_func entryFunction);
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// always hold mLock when reading or writing
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pthread_t mThread;
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char mThreadName[MAX_THREAD_NAME_LEN];
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mutable ATools::Mutex mLock;
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ATools::Condition mCondition;
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int mStatus;
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// note that all accesses of mExitPending and mRunning need to hold mLock
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volatile bool mExitPending;
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volatile bool mRunning;
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int mPriority;
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};
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}
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#endif /*_TOOS_THREAD_H_*/ |