class File
Public Instance Methods
Source
# File lib/logging/utils.rb, line 84 def flock? status = flock(LOCK_EX|LOCK_NB) case status when false; true when 0; block_given? ? yield : false else raise SystemCallError, "flock failed with status: #{status}" end ensure flock LOCK_UN end
Returns true
if another process holds an exclusive lock on the file. Returns false
if this is not the case.
If a block
of code is passed to this method, it will be run iff this process can obtain an exclusive lock on the file. The block will be run while this lock is held, and the exclusive lock will be released when the method returns.
The exclusive lock is requested in a non-blocking mode. This method will return immediately (and the block will not be executed) if an exclusive lock cannot be obtained.
Source
# File lib/logging/utils.rb, line 100 def flock_sh flock LOCK_SH yield ensure flock LOCK_UN end
Execute a block
in the context of a shared lock on this file. A shared lock will be obtained on the file, the block executed, and the lock released.