Taling problems in Windows
I built this beautiful dashboard collecting data from different sensors on a high efficiency vehicle.
I opted for an html page with server-events.
Now I need to tail two files every 0.2 seconds and those files are uptaded every 0.2 seconds. These in Windows 7 brings up random errors when tail.exe tries to read a file that’s being updated in the same exact instant.
This means that tail.exe uses file reading with an exclusive lock very baaaad!
I wondered if powershell had a non locking mechanism for reading content from files.
I whipped up something with Set-Content and Get-Content but to no avail because Get-Content seems to use a reading exclusive lock too!
So I invoked the powers of ruby flock (f-ile lock) to overcome this problem.
Try this on windows:
- launch the writing.rb process
- launch as many reading.rb processes you want
You will find no problems nor errors!