I want a (global) mutex which prevents a section of my code from being run by more than one process (or user) at a time. I have something that works, EXCEPT when there is an exception of some kind. It is possible for the user to generate an error and be able to "fix" the thing that caused the error (perhaps by changing some parameter) and then want to run the operation again from the same process. But if there's been an error, then he's out of luck and has to restart the process (which, in some cases is a bit arduous.
So, to summarize. It works perfectly as long as there is no error. When there is an error, the process has to be restarted. I need a way to guard my "DoStuff()" code so that only one thread/process/user is ever running it at any time and when it fails, the process does not have to be shut down to release the mutex
My code looks like the following
if ( WantToDoStuff (...)
bool got_ownership
Mutex mt = new Mutex(true, "Company.Divisi on.Project.Subp roject.Componen t", out got_ownership)
if ( got_ownership
tr
DoStuff ( ... )
GC.Collect()
catch ( Exception e
error_message = e.Message + e.StackTrace
GC.Collect()
mt.ReleaseMutex ()
els
error_message = "Didn't get mutex."
GC.Collect()
2  2613 
Lowell <th****@theyas. com> wrote: So, to summarize. It works perfectly as long as there is no error.
When there is an error, the process has to be restarted. I need a way
to guard my "DoStuff()" code so that only one thread/process/user is
ever running it at any time and when it fails, the process does not
have to be shut down to release the mutex.
You have misunderstood the purpose of the third parameter to the Mutex
constructor. It doesn't say whether or not you've got ownership, it
says whether or not the mutex had to be constructed.
Instead of the code you've got, you should create the mutex without
bothering to try to gain ownership, and then call WaitOne on it.
--
Jon Skeet - <sk***@pobox.co m> http://www.pobox.com/~skeet
If replying to the group, please do not mail me too
Bingo
Thanks
Lowel
----- Jon Skeet [C# MVP] wrote: ----
Lowell <th****@theyas. com> wrote So, to summarize. It works perfectly as long as there is no error
When there is an error, the process has to be restarted. I need a wa
to guard my "DoStuff()" code so that only one thread/process/user i
ever running it at any time and when it fails, the process does no
have to be shut down to release the mutex
You have misunderstood the purpose of the third parameter to the Mutex
constructor. It doesn't say whether or not you've got ownership, it
says whether or not the mutex had to be constructed
Instead of the code you've got, you should create the mutex without
bothering to try to gain ownership, and then call WaitOne on it
--
Jon Skeet - <sk***@pobox.co m http://www.pobox.com/~skee
If replying to the group, please do not mail me to This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics | |
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#---------------------------------------------------------------------------
# -*- coding: cp1252 -*-
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Here is some sample code with pywin32 build 203 and ctypes 0.9.6.
Best regards,
/Srijit
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