File based process synchronization

  • Thread starter Thread starter Ulrich Sprick
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Ulrich Sprick

Hi all,

I have a problem that should be quite common, but I'm not (yet) familiar with process synchronization in .NET:
There are several applications that write to a single file on disk. The apps open a FileStream with FileShare.None to prevent others
from reading garbage.

Now if a second process wants to open the file, it will fail. Currently I put the thread in a short Sleep and retry loop, but I'd
rather like to WaitForSingleObject() or so: The process 2 should be blocked until the first one closes the file and the file
(handle?) gets "signaled".

I came across the W32 Read/WriteFileEx(), which performs overlapped I/O, but I have a feeling that's a number too big...
Can anyone point me in the right direction?

Thanks a lot,
ulrich
 
Ulrich Sprick said:
I have a problem that should be quite common, but I'm not (yet)
familiar with process synchronization in .NET:
Click to expand...
There are several applications that write to a single file on disk.
The apps open a FileStream with FileShare.None to prevent others from
reading garbage.

Now if a second process wants to open the file, it will fail.
Currently I put the thread in a short Sleep and retry loop, but I'd
rather like to WaitForSingleObject() or so: The process 2 should be
blocked until the first one closes the file and the file (handle?)
gets "signaled".

I came across the W32 Read/WriteFileEx(), which performs overlapped
I/O, but I have a feeling that's a number too big... Can anyone point
me in the right direction?
Click to expand...

I'd suggest using a Mutex which you wait for and signal.
 
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