terminateThread

来源:转载

在多线程的程序里,往往很容易的使用TerminateThread函数。这个函数的功能是结束一个工作的线程在MSDN中REMARKS是这样说的:

TerminateThread is used to cause a thread to exit. When this occurs, the target thread has no chance to execute any user-mode code. DLLs attached to the thread are not notified that the thread is terminating. The system frees the thread's initial stack.

Windows Server 2003 and Windows XP/2000: The target thread's initial stack is not freed, causing a resource leak.

TerminateThread is a dangerous function that should only be used in the most extreme cases. You should call TerminateThread only if you know exactly what the target thread is doing, and you control all of the code that the target thread could possibly be running at the time of the termination. For example, TerminateThread can result in the following problems:

  • If the target thread owns a critical section, the critical section will not be released.
  • If the target thread is allocating memory from the heap, the heap lock will not be released.
  • If the target thread is executing certain kernel32 calls when it is terminated, the kernel32 state for the thread's process could be inconsistent.
  • If the target thread is manipulating the global state of a shared DLL, the state of the DLL could be destroyed, affecting other users of the DLL.

A thread cannot protect itself against TerminateThread, other than by controlling access to its handles. The thread handle returned by the CreateThread and CreateProcess functions has THREAD_TERMINATE access, so any caller holding one of these handles can terminate your thread.

If the target thread is the last thread of a process when this function is called, the thread's process is also terminated.

The state of the thread object becomes signaled, releasing any other threads that had been waiting for the thread to terminate. The thread's termination status changes from STILL_ACTIVE to the value of the dwExitCode parameter.

Terminating a thread does not necessarily remove the thread object from the system. A thread object is deleted when the last thread handle is closed.

这里说,TerminateThread会引起: 如果目标线程进入一个临界区域,则这个线程不会释放。我这次这个项目中碰到一个程序没反应的问题就是这个引起。

当一个线程运行malloc或者free函数时,会进入一个堆的临界区域。这个时候如果线程被中断,其它线程都会因为等待而僵死。

如果这个时候进入程序调用堆栈,你会看到很多线程死地free或者malloc内部。

所以结束线程最好不会用这个函数中断。


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