锁定文件超时? [英] LockFile with timeout?

问题描述

LockFile() 没有等待超时，LockFileEx() 也没有.
如果我想等待超时的文件锁定，我该怎么办?

LockFile() does not have waiting timeout, LockFileEx() does not, either.
If I want to wait for file-lock with timeout, how would I go about it?

也就是说，我如何实现以下内容:

That is, how do I implement the following:

DWORD LockFileTimed(HANDLE h,  
    DWORD milli,  
    __in  DWORD dwFileOffsetLow,  
    __in  DWORD dwFileOffsetHigh,  
    __in  DWORD nNumberOfBytesToLockLow,  
    __in  DWORD nNumberOfBytesToLockHigh)  

推荐答案

我理解您使用 LockFileTimed 的意图，因为当文件无法锁定时它不会立即返回，而是重新尝试锁定文件给定的时间.这样对吗?目前还不清楚这是否是您想要的.

I understand your intention of LockFileTimed as it will not return immediately when the file cannot be locked, but retry to lock the file for the given time. Is it right? It's unclear whether this is what you want.

一个简单的实现方法就是编写一个小循环来检查返回码.

A simple way to implement would be just writing a small loop to check the return code.

DWORD timer_end = GetTickCount() + milli;
while (GetTickCount() < timer_end) {
  if (LockFile(...))
    return TRUE;
  else
    Sleep(0); // Wait sometime.
}
return FALSE;

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