共有mutexとクラスインスタンスを持つC++ 11スレッド

Question

こんにちは、私はC++ 11とスレッドを試しています。私は解決する方法を理解できないいくつかの問題に直面しています。私は別のスレッドでクラスのものをやりたいし、いくつかの関数とクラスでmutexを使う必要があります。 はい私はstd :: mutexはコピー可能ではありませんが、私の問題の解決方法はわかりません。私が持っているもの

は、これまで main.cppにある：

#include <iostream> 
#include <thread> 
#include <mutex> 
#include "ThreadClass.h" 

void thread_without_class(std::mutex &mutex); 
void thread_without_class2(int number, std::mutex &mutex); 

int main(int argc, char** argv){  
std::mutex mutex; 

ThreadClass *threadClass = new ThreadClass(); 

std::thread t1(thread_without_class, &mutex); 
std::thread t2(thread_without_class2, 10, &mutex); 
std::thread t3(thread_without_class2, 11, &mutex); 
std::thread t4(threadClass); 

threadClass->mutex = mutex; 
threadClass->numberOfOutputsI = 5; 
threadClass->ThreadOutput(); 

t1.join(); 
t2.join(); 
t3.join(); 
t4.join(); 

delete threadClass; 
return 0; 
} 


void thread_without_class(std::mutex &mutex){ 
std::lock_guard<std::mutex> lock(mutex); 
std::cout << "c++11 thread without anything" << std::endl; 
} 

void thread_without_class2(int number, std::mutex &mutex){ 
for (auto i=0; i<number; i++){ 
    std::lock_guard<std::mutex> lock(mutex); 
    std::cout << "c++11 thread with function parameter: " << number << std::endl; 
} 
} 

ThreadClass.h：

#pragma once 
#include <mutex> 

class ThreadClass{ 
public: 
ThreadClass(void); 
~ThreadClass(void); 
void ThreadOutput(); 

std::mutex mutex; 
int numberOfOutputsI; 
}; 

ThreadClass.cpp

#include "ThreadClass.h" 
#include <iostream> 

ThreadClass::ThreadClass(void){ 
numberOfOutputsI = 0; 
} 

ThreadClass::~ThreadClass(void){ 
} 

void ThreadClass::ThreadOutput(){ 
for (auto i=0; i<numberOfOutputsI; i++){ 
    std::lock_guard<std::mutex> lock(mutex); 
    std::cout << "I am a class called as a thread" << std::endl; 
}} 

Answer 1

あなたはコピーをしたくありません、参照/ポインタ：

class ThreadClass{ 
    //.. 
    std::mutex* mutex = nullptr; 
}; 

そしてmain中：

threadClass->mutex = &mutex; 

Answer 2

あなただけのstdとスレッドへの参照を渡すことができ:: refを（）：

#include <iostream> 
#include <thread> 
#include <mutex> 

class ThreadClass{ 
public: 
    ThreadClass(std::mutex& m) : mutex(m) {}; 
    void ThreadOutput(); 

    std::mutex& mutex; 
    int numberOfOutputsI = 0; 
}; 

void ThreadClass::ThreadOutput(){ 
    for (auto i=0; i<numberOfOutputsI; i++){ 
     std::lock_guard<std::mutex> lock(mutex); 
     std::cout << "I am a class called as a thread" << std::endl; 
    } 
} 


void thread_without_class(std::mutex &mutex); 
void thread_without_class2(int number, std::mutex &mutex); 

int main(int argc, char** argv){ 
    std::mutex mutex; 

    auto threadClass = std::make_unique<ThreadClass>(std::ref(mutex)); 

    std::thread t1(thread_without_class, std::ref(mutex)); 
    std::thread t2(thread_without_class2, 10, std::ref(mutex)); 
    std::thread t3(thread_without_class2, 11, std::ref(mutex)); 
    std::thread t4([tc = std::move(threadClass)]() { 
     tc->numberOfOutputsI = 5; 
     tc->ThreadOutput(); 
    }); 


    t1.join(); 
    t2.join(); 
    t3.join(); 
    t4.join(); 

    return 0; 
} 


void thread_without_class(std::mutex &mutex){ 
    std::lock_guard<std::mutex> lock(mutex); 
    std::cout << "c++11 thread without anything" << std::endl; 
} 

void thread_without_class2(int number, std::mutex &mutex){ 
    for (auto i=0; i<number; i++){ 
     std::lock_guard<std::mutex> lock(mutex); 
     std::cout << "c++11 thread with function parameter: " << number << std::endl; 
    } 
} 

出力例：

c++11 thread with function parameter: 10 
c++11 thread without anything 
c++11 thread with function parameter: 11 
I am a class called as a thread 
c++11 thread with function parameter: 10 
c++11 thread with function parameter: 11 
I am a class called as a thread 
c++11 thread with function parameter: 10 
c++11 thread with function parameter: 11 
I am a class called as a thread 
c++11 thread with function parameter: 10 
c++11 thread with function parameter: 11 
I am a class called as a thread 
c++11 thread with function parameter: 10 
c++11 thread with function parameter: 11 
I am a class called as a thread 
c++11 thread with function parameter: 10 
c++11 thread with function parameter: 11 
c++11 thread with function parameter: 10 
c++11 thread with function parameter: 11 
c++11 thread with function parameter: 10 
c++11 thread with function parameter: 11 
c++11 thread with function parameter: 10 
c++11 thread with function parameter: 11 
c++11 thread with function parameter: 10 
c++11 thread with function parameter: 11 
c++11 thread with function parameter: 11