[英]I have a problem with class multithreading in c++
我在 C++ 中遇到類多線程問題,我的代碼是下一個,但我有很多錯誤,我不知道為什么......我希望有人可以幫助我並解釋我的錯誤。 泰
Le fichier Task.hpp :
#ifndef TASK_HPP_ #define TASK_HPP_ #include "thread.hpp" class Task { public: Task(int id); virtual ~Task(); void setThread(Thread *_thread); void virtual work(); protected: int taskID; Thread *thread; }; #endif /* !TASK_HPP_ */
Le fichier Thread.hpp :
#ifndef THREAD_HPP_
#define THREAD_HPP_
#include "pool.hpp"
class Thread
{
public:
Thread();
void setPool(Pool *_pool);
void setId(int _id);
int getId();
void start();
void terminate();
static void* work(void *param);
private:
pthread_t pthread;
Pool *pool;
int id;
bool isWorking = false;
};
#endif /* !THREAD_HPP_ */
Le fichier Pool.hpp :
#ifndef POOL_HPP_
#define POOL_HPP_
#include "thread.hpp"
#include "task.hpp"
class Pool
{
public:
static pthread_mutex_t taskQueue_lock;
static pthread_cond_t taskQueue_cond;
Pool();
Pool(int num);
virtual ~Pool();
void initThreads();
void assignJob(Task *_job_);
bool loadJob(Task *&_job_);
bool end();
private:
std::queue<Task*> taskQueue;
int numOfThreads;
std::vector<Thread*> threads;
bool isTerminated = false;
};
#endif /* !POOL_HPP_ */
編譯:
c++ -g -I ./includes/ -c -o sources/pool.o sources/pool.cpp
In file included from sources/pool.cpp:1:
In file included from ./includes/thread.hpp:13:
In file included from ./includes/pool.hpp:14:
./includes/task.hpp:20:24: error: unknown type name 'Thread'; did you mean 'std::thread'?
void setThread(Thread *_thread);
^~~~~~
std::thread
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/thread:285:24: note: 'std::thread' declared here
class _LIBCPP_TYPE_VIS thread
^
In file included from sources/pool.cpp:1:
In file included from ./includes/thread.hpp:13:
In file included from ./includes/pool.hpp:14:
./includes/task.hpp:30:9: error: unknown type name 'Thread'; did you mean 'std::thread'?
Thread *thread;
^~~~~~
std::thread
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/thread:285:24: note: 'std::thread' declared here
class _LIBCPP_TYPE_VIS thread
^
In file included from sources/pool.cpp:1:
In file included from ./includes/thread.hpp:13:
./includes/pool.hpp:32:28: error: expected expression
std::vector<Thread*> threads;
^
./includes/pool.hpp:32:21: error: use of undeclared identifier 'Thread'
std::vector<Thread*> threads;
^
./includes/pool.hpp:33:27: warning: in-class initialization of non-static data member is a C++11 extension [-Wc++11-extensions]
bool isTerminated = false;
^
In file included from sources/pool.cpp:1:
./includes/thread.hpp:34:24: warning: in-class initialization of non-static data member is a C++11 extension [-Wc++11-extensions]
bool isWorking = false;
^
2 warnings and 4 errors generated.
make: *** [sources/pool.o] Error 1
您的標頭中存在循環依賴問題。
Task.hpp
#include "thread.hpp"
Thread.hpp <——————————-
#include "pool.hpp" ^
Pool.hpp | Loop
include "thread.hpp" ——-——->
我認為您應該檢查您的依賴項
您的依賴項是:
task -> thread
thread -> pool
pool -> thread task
你正在編譯池。 池需要線程,線程需要池。 要獲得周圍循環依賴,您需要使用前向聲明。 參見C 循環依賴
#ifndef TASK_HPP_
#define TASK_HPP_
class Thread; // forward declaration
class Task
{
public:
Task(int id);
virtual ~Task();
void setThread(Thread *_thread);
void virtual work();
protected:
int taskID;
Thread *thread;
};
#endif /* !TASK_HPP_ */
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