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得到主线程ID

2011-02-10 14:30:20| 分类： C/C++ | 标签： |举报 |字号大中小订阅

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多线程应用中通常需要判断当前是否处于主线程中。通过判断当前线程ID是否和主线程ID相等即可实现该功能。

#include <Windows.h>
#include <tlhelp32.h>

DWORD GetMainThreadId(DWORD processId = 0)
{
if(processId == 0)
processId = GetCurrentProcessId();

DWORD threadId = 0;
THREADENTRY32 te32 = { sizeof(te32) };
HANDLE threadSnap = CreateToolhelp32Snapshot(TH32CS_SNAPTHREAD, 0);
if(Thread32First(threadSnap, &te32))
{
do
{
if( processId == te32.th32OwnerProcessID )
{
threadId = te32.th32ThreadID;
break;
}
}while(Thread32Next(threadSnap, &te32));
}
return threadId;
}

bool IsMainThread()
{
return GetCurrentThreadId() == GetMainThreadId();
}

如果利用线程本地存储(Thread Local Storage, TLS)，还可通过防止重复请求线程ID加速一下下。

参考：

怎样利用进程ID获取主线程ID

线程本地存储 __declspec(thread)

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