其他人想必会有这样的感觉,早上酣畅淋漓的写完一段代码,心情特别舒适,可是却发现了异常,然后开始debug直到忘记了吃饭,好心情就一点点被消磨掉。这种情况在写多线程代码的时候更是常见,一个工作线程的任务被层层封装,然后才被扔到工作线程队列,我从哪里来是不知道的,甚至于连我在哪里都不知道,设置线程名称,就是为了解决“我在哪里”的问题。在debug时,线程有了名称,查bug的效率会得到提升。
设置线程名称,只有短短的几行代码,windows已经做好了准备,只需要触发它。这么简单的东西其实没有必要写到博客里,但是最近我发现还是有不少人不知道、或者没想到去这么做的。
以上是废话,以下才是重点:
#include <iostream> #include <windows.h> #include <process.h> //2013.3.5 //cswuyg //参考 chromium源码: src\base\threading\platform_thread_win.cc // The information on how to set the thread name comes from // a MSDN article: http://msdn2.microsoft.com/en-us/library/xcb2z8hs.aspx const DWORD kVCThreadNameException = 0x406D1388; typedef struct tagTHREADNAME_INFO { DWORD dwType; // Must be 0x1000. LPCSTR szName; // Pointer to name (in user addr space). DWORD dwThreadID; // Thread ID (-1=caller thread). DWORD dwFlags; // Reserved for future use, must be zero. } THREADNAME_INFO; // This function has try handling, so it is separated out of its caller. void SetNameInternal(DWORD thread_id, const char* name) { //只在调试的时候生效 if (!::IsDebuggerPresent()) return; THREADNAME_INFO info; info.dwType = 0x1000; info.szName = name; info.dwThreadID = thread_id; info.dwFlags = 0; __try { RaiseException(kVCThreadNameException, 0, sizeof(info)/sizeof(DWORD), reinterpret_cast<DWORD_PTR*>(&info)); } __except(EXCEPTION_CONTINUE_EXECUTION) { } } static unsigned int _stdcall Run(void* argv) { while(true) { std::cout << "Thread " << (int)argv << std::endl; Sleep(5000); } } void testFunc() { DWORD thread_id_1; HANDLE thread_handle_1 = (HANDLE)_beginthreadex( NULL, 0, Run, (void*)1, 0, (unsigned int*)&thread_id_1); SetNameInternal(thread_id_1, "My Thead Thread_1"); DWORD thread_id_2; HANDLE thread_handle_2 = (HANDLE)_beginthreadex( NULL, 0, Run, (void*)2, 0, (unsigned int*)&thread_id_2); SetNameInternal(thread_id_2, "My Thead Thread_2"); } int main() { testFunc(); system("pause"); return 1; }
啥也不说了,代码很简单。