终止线程C++ 11在读上被阻止

我有以下代码:

class Foo {
private:
    std::thread thread;
    void run();
    std::atomic_flag running;
    std::thread::native_handle_type native;
public:
    Foo(const std::string& filename);
    virtual ~Foo();
    virtual void doOnChange();
    void start();
    void quit();
};

#include "Foo.h"
#include <functional>

#include <iostream>

Foo::Foo(const std::string& filename) :
        thread(), running(ATOMIC_FLAG_INIT) {
    file = filename;
    native = 0;
}

Foo::~Foo() {
    quit();
}

void Foo::start() {
    running.test_and_set();
    try {
        thread = std::thread(&Foo::run, this);
    } catch (...) {
        running.clear();
        throw;
    }
    native = thread.native_handle();
}

void Foo::quit() {
    running.clear();
    pthread_cancel(native);
    pthread_join(native, nullptr);
    //c++11-style not working here
    /*if (thread.joinable()) {
        thread.join();
        thread.detach();
    }*/
}

void Foo::run() {
   while (running.test_and_set()) {
        numRead = read(fd, buf, BUF_LEN);
        .....bla bla bla.......
   }
}

我正试图在程序清理代码中退出此线程。使用pTrand作品,但我想知道我是否可以做一些更好的与C++ 11只(没有本地句柄)。在我看来,用C++ 11代码处理所有的案例都是不好的。如您所见,线程在读取系统调用时被阻塞。因此,即使清除了标记,线程仍将被阻塞,而join调用将永远阻塞。所以我真正需要的是一个中断(在本例中 pthread_cancel )但是如果我打电话 线程删除 我不能再调用C++ 11连接()方法,因为它失败了,我只能调用 pthread_join() . 所以这个标准似乎有很大的局限性,我会错过什么吗?

编辑:

在STD::原子和使用信号处理程序之后,我讨论了FoO类的实现,替换了STD::AddiICIH标志。我使用信号处理程序是因为在我看来最好有一个通用的基类,在一个基类中使用self pipe技巧太难了,逻辑应该委托给子类。最终实施:

#include <thread>
#include <atomic>

class Foo {
private:
    std::thread thread;
    void mainFoo();
    std::atomic<bool> running;
    std::string name;
    std::thread::native_handle_type native;
    static void signalHandler(int signal);
    void run();
public:
    Thread(const std::string& name);
    virtual ~Thread();
    void start();
    void quit();
    void interrupt();
    void join();
    void detach();
    const std::string& getName() const;
    bool isRunning() const;
};

CPP文件:

#include <functional>
#include <fcntl.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/inotify.h>
#include <Foo.h>
#include <csignal>
#include <iostream>

Foo::Foo(const std::string& name) :
        name(name) {
    running = false;
    native = 0;
    this->name.resize(16, '\0');
}

Foo::~Foo() {
}

void Foo::start() {
    running = true;
    try {
        thread = std::thread(&Foo::mainFoo, this);
    } catch (...) {
        running = false;
        throw;
    }
    native = thread.native_handle();
    pthread_setname_np(native, name.c_str());
}

void Foo::quit() {
    if (running) {
        running = false;
        pthread_kill(native, SIGINT);
        if (thread.joinable()) {
            thread.join();
        }
    }
}

void Foo::mainFoo() {
 //enforce POSIX semantics
 siginterrupt(SIGINT, true);
 std::signal(SIGINT, signalHandler);
    run();
    running = false;
}

void Foo::join() {
    if (thread.joinable())
        thread.join();
}

void Foo::signalHandler(int signal) {
}

void Foo::interrupt() {
    pthread_kill(native, SIGINT);
}

void Foo::detach() {
    if (thread.joinable())
        thread.detach();
}

const std::string& Foo::getName() const {
    return name;
}

bool Foo::isRunning() const {
    return running;
}

void Foo::run() {
    while(isRunning()) {
         num = read(.....);
         //if read is interrupted loop again, this time
         //isRunning() will return false
    }
}