我使用Boost ASIO在C++中編寫ThreadPool類。以下是我迄今所編寫的代碼:使用ASIO的ThreadPool - 線程退出,不執行任務
ThreadPool類
using namespace std;
using namespace boost;
class ThreadPoolClass {
private:
/* The limit to the maximum number of threads to be
* instantiated within this pool
*/
int maxThreads;
/* Group of threads in the Pool */
thread_group threadPool;
asio::io_service asyncIOService;
void _Init()
{
maxThreads = 0;
}
public:
ThreadPoolClass();
ThreadPoolClass(int maxNumThreads);
ThreadPoolClass(const ThreadPoolClass& orig);
void CreateThreadPool();
void RunTask(JobClass * aJob);
virtual ~ThreadPoolClass();
};
ThreadPoolClass::ThreadPoolClass() {
_Init();
}
ThreadPoolClass::ThreadPoolClass(int maxNumThreads) {
_Init();
maxThreads = maxNumThreads;
}
void ThreadPoolClass::CreateThreadPool() {
asio::io_service::work work(asyncIOService);
for (int i = 0; i < maxThreads; i++) {
cout<<"Pushed"<<endl;
threadPool.create_thread(bind(&asio::io_service::run, &asyncIOService));
}
}
void ThreadPoolClass::RunTask(JobClass * aJob) {
cout<<"RunTask"<<endl;
asyncIOService.post(bind(&JobClass::Run,aJob));
}
ThreadPoolClass::ThreadPoolClass(const ThreadPoolClass& orig) {
}
ThreadPoolClass::~ThreadPoolClass() {
cout<<"Kill ye all"<<endl;
asyncIOService.stop();
threadPool.join_all();
}
作業類
using namespace std;
class JobClass {
private:
int a;
int b;
int c;
public:
JobClass() {
//Empty Constructor
}
JobClass(int val) {
a = val;
b = val - 1;
c = val + 1;
}
void Run()
{
cout<<"a: "<<a<<endl;
cout<<"b: "<<b<<endl;
cout<<"c: "<<c<<endl;
}
};
主要
using namespace std;
int main(int argc, char** argv) {
ThreadPoolClass ccThrPool(20);
ccThrPool.CreateThreadPool();
JobClass ccJob(10);
cout << "Starting..." << endl;
while(1)
{
ccThrPool.RunTask(&ccJob);
}
return 0;
}
所以,基本上我創建了20個線程,但現在只是發佈一個(相同)任務,由ioservice運行(只是爲了簡單起見,解決根本原因)。以下是輸出,當我運行這個程序在GDB:
Pushed
[New Thread 0xb7cd2b40 (LWP 15809)]
Pushed
[New Thread 0xb74d1b40 (LWP 15810)]
Pushed
[New Thread 0xb68ffb40 (LWP 15811)]
Pushed
[New Thread 0xb60feb40 (LWP 15812)]
Pushed
[New Thread 0xb56fdb40 (LWP 15813)]
Pushed
[New Thread 0xb4efcb40 (LWP 15814)]
Pushed
[New Thread 0xb44ffb40 (LWP 15815)]
Pushed
[New Thread 0xb3affb40 (LWP 15816)]
Pushed
[New Thread 0xb30ffb40 (LWP 15817)]
Pushed
[New Thread 0xb28feb40 (LWP 15818)]
Pushed
[New Thread 0xb20fdb40 (LWP 15819)]
Pushed
[New Thread 0xb18fcb40 (LWP 15820)]
Pushed
[New Thread 0xb10fbb40 (LWP 15821)]
Pushed
[New Thread 0xb08fab40 (LWP 15822)]
Pushed
[New Thread 0xb00f9b40 (LWP 15823)]
Pushed
[New Thread 0xaf8f8b40 (LWP 15824)]
Pushed
[New Thread 0xaf0f7b40 (LWP 15825)]
Pushed
[New Thread 0xae8f6b40 (LWP 15826)]
Pushed
[New Thread 0xae0f5b40 (LWP 15827)]
Pushed
[New Thread 0xad8f4b40 (LWP 15828)]
Starting...
RunTask
Kill ye all
[Thread 0xb4efcb40 (LWP 15814) exited]
[Thread 0xb30ffb40 (LWP 15817) exited]
[Thread 0xaf8f8b40 (LWP 15824) exited]
[Thread 0xae8f6b40 (LWP 15826) exited]
[Thread 0xae0f5b40 (LWP 15827) exited]
[Thread 0xaf0f7b40 (LWP 15825) exited]
[Thread 0xb56fdb40 (LWP 15813) exited]
[Thread 0xb18fcb40 (LWP 15820) exited]
[Thread 0xb10fbb40 (LWP 15821) exited]
[Thread 0xb20fdb40 (LWP 15819) exited]
[Thread 0xad8f4b40 (LWP 15828) exited]
[Thread 0xb3affb40 (LWP 15816) exited]
[Thread 0xb7cd2b40 (LWP 15809) exited]
[Thread 0xb60feb40 (LWP 15812) exited]
[Thread 0xb08fab40 (LWP 15822) exited]
[Thread 0xb68ffb40 (LWP 15811) exited]
[Thread 0xb74d1b40 (LWP 15810) exited]
[Thread 0xb28feb40 (LWP 15818) exited]
[Thread 0xb00f9b40 (LWP 15823) exited]
[Thread 0xb44ffb40 (LWP 15815) exited]
[Inferior 1 (process 15808) exited normally]
我有兩個問題:
- 爲什麼會這樣,我的線程退出,甚至當我張貼在 任務while循環?
- 爲什麼JobClass的輸出,即變量a,b 和c的值未被打印?
我建議使用'std :: unique_ptr'(如果有的話)而不是'std :: auto_ptr',因爲'std :: auto_ptr'已被棄用。 –
@JoachimPileborg:同意,與現代編譯器,你應該更喜歡unique_ptr – nogard
@nogard,你的解決方案工作。愚蠢的是,我無法看清「變量超出範圍」問題! Joachim,std:unique_ptr它是! – Cik