From: James Edward Gray II <james@...>
Date: 2006-08-31T00:48:01+09:00
Subject: Re: problem using pstore with multi-users

On Aug 30, 2006, at 7:38 AM, khaines@enigo.com wrote:

> On Wed, 30 Aug 2006, Noam Noam wrote:
>
>> Hi all,
>> when i'm using pstore with multi-users:
>> Permission denied - ../comments.dat.new
>> it seems that more then one user is asking to use the same file.
>> i tried to use synchronize  for locking the transaction until it  
>> finsh,
>> but it seems that i can not using it when i using pstore.
>> any one having any idea???
>> Thanks.
>
> pstore doesn't itself do any locking of any sort.

I don't think that's accurate.  Here's part of the transaction()  
method for PStore.  Note the calls to flock():

   def transaction(read_only=false)  # :yields:  pstore
     # ...

       unless read_only
         file = File.open(@filename, File::RDWR | File::CREAT)
         file.binmode
         file.flock(File::LOCK_EX)
         commit_new(file) if FileTest.exist?(new_file)
         content = file.read()
       else
         begin
           file = File.open(@filename, File::RDONLY)
           file.binmode
           file.flock(File::LOCK_SH)
           content = (File.read(new_file) rescue file.read())
         rescue Errno::ENOENT
           content = ""
         end
       end

    # ...

James Edward Gray II