下面是我的代码,我的问题是readEvent()函数永远不会被调用。
Header file
class MyServer
{
public :
MyServer(MFCPacketWriter *writer_);
~MyServer();
void startReading();
void stopReading();
private :
MFCPacketWriter *writer;
pthread_t serverThread;
bool stopThread;
static void *readEvent(void *);
};
CPP file
MyServer::MyServer(MFCPacketWriter *writer_):writer(writer_)
{
serverThread = NULL;
stopThread = false;
LOGD(">>>>>>>>>>>>> constructed MyServer ");
}
MyServer::~MyServer()
{
writer = NULL;
stopThread = true;
}
void MyServer::startReading()
{
LOGD(">>>>>>>>>>>>> start reading");
if(pthread_create(&serverThread,NULL,&MyServer::readEvent, this) < 0)
{
LOGI(">>>>>>>>>>>>> Error while creating thread");
}
}
void *MyServer::readEvent(void *voidptr)
{
// this log never gets called
LOGD(">>>>>>>>>>>>> readEvent");
while(!MyServer->stopThread){
//loop logic
}
}
Another class
MyServer MyServer(packet_writer);
MyServer.startReading();
答案 0 :(得分:0)
由于您没有调用pthread_join
,因此您的主线程正在终止而不等待您的工作线程完成。
以下是重现问题的简化示例:
#include <iostream>
#include <pthread.h>
class Example {
public:
Example () : thread_() {
int rcode = pthread_create(&thread_, nullptr, Example::task, nullptr);
if (rcode != 0) {
std::cout << "pthread_create failed. Return code: " << rcode << std::endl;
}
}
static void * task (void *) {
std::cout << "Running task." << std::endl;
return nullptr;
}
private:
pthread_t thread_;
};
int main () {
Example example;
}
运行此程序时不会产生任何输出,即使使用pthread_create
作为函数参数成功调用了Example::task
。
这可以通过在线程上调用pthread_join
来解决:
#include <iostream>
#include <pthread.h>
class Example {
public:
Example () : thread_() {
int rcode = pthread_create(&thread_, nullptr, Example::task, nullptr);
if (rcode != 0) {
std::cout << "pthread_create failed. Return code: " << rcode << std::endl;
}
}
/* New code below this point. */
~Example () {
int rcode = pthread_join(thread_, nullptr);
if (rcode != 0) {
std::cout << "pthread_join failed. Return code: " << rcode << std::endl;
}
}
/* New code above this point. */
static void * task (void *) {
std::cout << "Running task." << std::endl;
return nullptr;
}
private:
pthread_t thread_;
};
int main () {
Example example;
}
现在程序产生预期的输出:
正在运行任务。
在您的情况下,您可以向pthread_join
类的析构函数添加对MyServer
的调用。