LOCK
Stream = LOCK Path
Use the specified
Path to create a system-global lock.
If the specified file is already locked by another process, then the command fails.
Unlock the file with the
UNLOCK instruction.
Keep a reference on the stream object returned by LOCK, because
as soon as the stream object is freed, it is closed and the lock is released.
Example
DIM hLock AS Stream
' Try to acquire the lock
TRY hLock = LOCK "~/my-lock"
IF ERROR THEN
PRINT "Locked is already acquired. Try again later."
RETURN
ENDIF
' File is locked, you can do the job now!
...
' Do not forget to release the lock
UNLOCK hLock
LOCK WAIT
Since 3.6
Stream = LOCK Path WAIT Delay
Try to lock a file during a specified delay until it succeeds.
Delay is expressed in seconds (it can be a floating-point number).
If the delay elapses before the lock is acquired, the command fails
See also