Boost 线程退出代码?
从boost::thread获取退出代码的标准方法是什么?Boost 线程退出代码?,boost,multithreading,exit-code,Boost,Multithreading,Exit Code,从boost::thread获取退出代码的标准方法是什么? 我不知道线程退出代码是否可用,因为它是特定于操作系统的。您可以通过如下操作模拟传递退出代码或结果代码: struct callable { int result; void operator()() { result = 42; } }; void process_on_thread() { callable x; boost::thread processor(x);
我不知道线程退出代码是否可用,因为它是特定于操作系统的。您可以通过如下操作模拟传递退出代码或结果代码:
struct callable {
int result;
void operator()()
{
result = 42;
}
};
void process_on_thread() {
callable x;
boost::thread processor(x);
processor.join();
int result = x.result;
}
POSIX不支持来自线程的返回代码。我建议你使用未来:或者如果你在C++的老版本上,那么它已经有了一个很好的期货实现。这为阻塞通信和非阻塞通信提供了一种通用语法,允许您返回任何类型的对象,并且作为蛋糕上的糖霜,允许您将异常传播到线程之外。自从Boost.Thread复制了您传递的函子之后,David的解决方案在任何实际示例中都不起作用。您基本上有两种选择:
#include <boost/thread/thread.hpp>
#include <boost/thread/xtime.hpp>
#include <boost/shared_ptr.hpp>
#include <iostream>
struct thread_alarm
{
thread_alarm(int secs, int &ec) : m_secs(secs), exit_code(ec) { }
void operator()()
{
boost::xtime xt;
boost::xtime_get(&xt, boost::TIME_UTC);
xt.sec += m_secs;
boost::thread::sleep(xt);
std::cout << "alarm sounded..." << std::endl;
exit_code = 0xDEADBEEF;
}
int m_secs;
int &exit_code;
};
typedef boost::shared_ptr<boost::thread> BoostThreadPtr;
int main(int argc, char* argv[])
{
int secs = 1;
int exit_codes[10];
BoostThreadPtr threads[10];
for (int i = 0; i<10; ++i) {
std::cout << "setting alarm for 1 seconds..." << std::endl;
thread_alarm alarm(secs, exit_codes[i]);
threads[i] = BoostThreadPtr(new boost::thread(alarm));
}
for (int i = 0; i<10; ++i) {
threads[i]->join();
std::cout << "exit code == 0x" << std::hex << exit_codes[i] << std::endl;
}
}
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结构线程报警
{
线程报警(int secs,int&ec):m secs(secs),退出代码(ec){}
void运算符()()
{
boost::xtime xt;
boost::xtime\u get(&xt,boost::TIME\u UTC);
xt.sec+=毫微秒;
boost::thread::sleep(xt);
std::cout为了使其工作,您必须在引用包装器中传递x,因为boost::thread的构造函数复制参数。
#include <boost/thread/thread.hpp>
#include <boost/thread/xtime.hpp>
#include <boost/shared_ptr.hpp>
#include <iostream>
struct thread_alarm
{
thread_alarm(int secs) : m_secs(secs) { exit_code = IntPtr( new int(0) ); }
void operator()()
{
boost::xtime xt;
boost::xtime_get(&xt, boost::TIME_UTC);
xt.sec += m_secs;
boost::thread::sleep(xt);
std::cout << "alarm sounded..." << std::endl;
*exit_code = 0xDEADBEEF;
}
int m_secs;
typedef boost::shared_ptr<int> IntPtr;
IntPtr exit_code;
};
int main(int argc, char* argv[])
{
int secs = 5;
std::cout << "setting alarm for 5 seconds..." << std::endl;
thread_alarm alarm(secs);
boost::thread thrd(alarm);
thrd.join();
std::cout << "exit code == 0x" << std::hex << *(alarm.exit_code) << std::endl;
}