Binding file lifescope to a process Post: 302215066

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Top Forums Programming Binding file lifescope to a process Post 302215066 by Fronsac on Tuesday 15th of July 2008 12:38:41 PM

07-15-2008

Registered User

Hi Jim,
Thanks for your reply. I fear I may have not written enough details on the problem I am trying to solve. What I forgot to tell is that I am working in a possibly multiplatform solution (Windows and UN*X) and hence can't rely on OS locking mechanisms. The more I think about it the more it seems like it needs to be application-driven.

The problem with your solution is that it's probably not network safe, as different NFS implementations don't correctly support calls from flock or fnctl and these function calls are not guaranteed to be honored by file systems from other OSes. So basically any OS specific file locking is not going to work. What I am really looking for is a way to make sure a file is deleted when a process ends. I've thought of having a 2nd process monitor my first process and then clean up any files left behind in case of a crash, but it seems like a subpart solution when a perfectly viable solution exists for Windows based OSes (CreateFile with FILE_FLAG_DELETE_ON_CLOSE). Is there an equivalent OS provided service I can use that does that?

Don't know if this helps, but the reason I'm going through all this trouble is because I'm trying to implement some form of cross platform advisory file locking that is at least process-crash-tolerant where multiple users on different machines can take the lock for a given file. Obviously, if you've read any papers on such a locking mechanism, please do point me towards it, even if they aren't related at all with the approach I am trying to take right now.

Thanks again!

Fronsac

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streamwrapper.stream_lock

STREAMWRAPPER.STREAM_LOCK(3)						 1					      STREAMWRAPPER.STREAM_LOCK(3)

streamWrapper::stream_lock - Advisory file locking

SYNOPSIS

       public bool streamWrapper::stream_lock (int  $operation)

DESCRIPTION

	This  method  is called in response to flock(3), when file_put_contents(3) (when $flags contains LOCK_EX), stream_set_blocking(3) and when
       closing the stream ( LOCK_UN).

PARAMETERS

	      o $operation
		-$operation is one of the following:

		     o LOCK_SH to acquire a shared lock (reader).

		     o LOCK_EX to acquire an exclusive lock (writer).

		     o LOCK_UN to release a lock (shared or exclusive).

		     o LOCK_NB if you don't want flock(3) to block while locking. (not supported on Windows)

RETURN VALUES

	Returns TRUE on success or FALSE on failure.

ERRORS
/EXCEPTIONS
	Emits E_WARNING if call to this method fails (i.e. not implemented).

SEE ALSO

       stream_set_blocking(3), flock(3).

PHP Documentation Group 											      STREAMWRAPPER.STREAM_LOCK(3)