C++ 如何使用专用线程类MyThreadClass
我喜欢这篇文章中的MyThreadClass:我想在我的课堂上使用它,但我很难弄明白,我现在拥有的是:C++ 如何使用专用线程类MyThreadClass,c++,class,polymorphism,pthreads,C++,Class,Polymorphism,Pthreads,我喜欢这篇文章中的MyThreadClass:我想在我的课堂上使用它,但我很难弄明白,我现在拥有的是: #include <pthread.h> #include <iostream> #include <vector> #define OK 0 #define ERROR -1 //-- ThreadClass class MyThreadClass { public: MyThreadClass() {/* empty */}
#include <pthread.h>
#include <iostream>
#include <vector>
#define OK 0
#define ERROR -1
//-- ThreadClass
class MyThreadClass
{
public:
MyThreadClass() {/* empty */}
virtual ~MyThreadClass() {/* empty */}
/** Returns true if the thread was successfully started, false if there was an error starting the thread */
bool StartInternalThread()
{
return (pthread_create(&_thread, NULL, InternalThreadEntryFunc, this) == 0);
}
/** Will not return until the internal thread has exited. */
void WaitForInternalThreadToExit()
{
(void) pthread_join(_thread, NULL);
}
protected:
/** Implement this method in your subclass with the code you want your thread to run. */
virtual void InternalThreadEntry() = 0;
private:
static void * InternalThreadEntryFunc(void * This) {
((MyThreadClass *)This)->InternalThreadEntry(); return NULL;
}
pthread_t _thread;
};
//-- /ThreadClass
//--- DUMMY DECLARATIONS BELOW TO MAKE IT COMPILE ---//
#define LOG_NS_ERROR std::cout
class test{
public:
int get_child(std::string x){return OK;};
};
test *_global;
typedef struct test_struct{} _db_transact;
class db_transact{
public:
db_transact(int,int&,int&){};
};
int _ns;
int _log_id;
//--- DUMMY DECLARATIONS ABOVE TO MAKE IT COMPILE ---//
class db_c_hndlr : public MyThreadClass{
public:
db_c_hndlr(void);
~db_c_hndlr(void);
db_transact *db_conn_get(void);
void InternalThreadEntry(void *func);
private:
int _stop;
std::vector<db_transact*> _db_pool;
};
//---------------------------------------------------------
db_c_hndlr::db_c_hndlr(void) {
}
//---------------------------------------------------------
void db_c_hndlr::InternatThreadEntry(void *func) {
while(!stop){
std::cout << "going!" << std::endl;
sleep(1);
}
}
//---------------------------------------------------------
db_c_hndlr::~db_c_hndlr() {
int i = 0;
std::vector<db_transact*>::iterator it;
for (i=0, it = _db_pool.begin();it!=_db_pool.end();it++, i++) {
if (_db_pool[i])
if (_db_pool[i]!=NULL)
delete _db_pool[i];
}
}
//---------------------------------------------------------
db_transact *db_c_hndlr::db_conn_get(void) {
db_transact *tmp;
tmp = new db_transact(_global->get_child("db_config"), _ns, _log_id);
_db_pool.push_back(tmp);
return tmp;
}
//---------------------------------------------------------
int main(void)
{
db_transact *conn=NULL;
db_c_hndlr db;
//db = new db_c_hndlr();
conn= db.db_conn_get();
return OK;
}
我正努力想办法让它发挥作用 提交的代码中有两个错误导致报告的错误
internetthreadentry
不是db\u c\u hndlr
的成员,因为db\u c\u hndlr
声明InternalThreadEntry
。这只是一个简单的打字错误:Internat!=Internaldb_c_hndlr
是一个抽象类,因为在MyThreadClass
中声明的纯虚拟函数InternalThreadEntry
没有参数db\u c\u hndlr
中。看起来应该不需要void*func
,所以我要通过删除参数来解决这个问题
无关:您可能会发现更通用、更便携。所提供的代码中有两个错误导致报告的错误
internetthreadentry
不是db\u c\u hndlr
的成员,因为db\u c\u hndlr
声明InternalThreadEntry
。这只是一个简单的打字错误:Internat!=Internaldb_c_hndlr
是一个抽象类,因为在MyThreadClass
中声明的纯虚拟函数InternalThreadEntry
没有参数db\u c\u hndlr
中。看起来应该不需要void*func
,所以我要通过删除参数来解决这个问题
无关:您可能会发现更多功能和可移植性。这是您的全部代码吗?@DrewDormann是的,这是您的全部代码吗?@DrewDormann是的,这是
$ g++ -lpthread pseudo_code.cpp
pseudo_code.cpp:70:48: error: no ‘void db_c_hndlr::InternatThreadEntry(void*)’ member function declared in class ‘db_c_hndlr’
void db_c_hndlr::InternatThreadEntry(void *func) {
^
pseudo_code.cpp: In function ‘int main()’:
pseudo_code.cpp:101:16: error: cannot declare variable ‘db’ to be of abstract type ‘db_c_hndlr’
db_c_hndlr db;
^
pseudo_code.cpp:54:7: note: because the following virtual functions are pure within ‘db_c_hndlr’:
class db_c_hndlr : public MyThreadClass{
^
pseudo_code.cpp:29:17: note: virtual void MyThreadClass::InternalThreadEntry()
virtual void InternalThreadEntry() = 0;
virtual void InternalThreadEntry() = 0;
void InternalThreadEntry(void *func)