Hi, monks

Some time ago I developed a Windows Service based system for transferring data between servers on our network. All has been running quite nicely now for almost a year, with one glaring exception. About once every two - three months, a thread will fail when attempting to open a file. As a point of context, there are 5 threads performing the work which run non-stop while the server is on (each thread executing the affected lines of code several thousand times per day). The servers are rebooted once a week and the service is only restarted when the reboot occurs.

The error I get is:

Thread 10 terminated abnormally: Failed to open \\server\share\INQUEUE\loadqueue.lck: Invalid argument at service.plx line 596.
The relevant code (lines 595 and 596) are: 
my $lockfile = $destDir."loadqueue.lck";
open my $fhLock, ">", $lockfile  or die "Failed to open $lockfile: $!"
+;

[download]

Any suggestions on why this code is failing would be highly appreciated. I guess the obvious work around would be something like this: 

my $lockfile = $destDir."loadqueue.lck";
my $fhLock;
do { eval { open $fhLock, ">", $lockfile  or die "Failed to open $lock
+file: $!" } }
until (defined $fhLock);

[download]
but without understanding why this error might be occurring, I'm a bit wary of doing this.

In reply to Problem opening file by SimonPratt

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