SETFILESEMAPHORE Set semaphore for file access.
SEMAPHORE = SETFILESEMAPHORE(FILENAME) sets a semaphore to get
exclusive access on file FILE. The semaphore is realized by generating
a simple Matlab data file after checking that no other semaphores are
existing. The function exits if the semaphore is set. Exclusive file
access is of course only guaranteed if all other Matlab processes use
semaphores to access the same file.
The output variable SEMAPHORE is needed to correctly remove the file
semaphore after file access. It is an error to call function
SETFILESEMAPHORE without output arguments.
SEMAPHORE = SETFILESEMAPHORE(FILELIST) sets semaphores for all files
given in cell array FILELIST. Note that function SETFILESEMAPHORE waits
for exclusive file access on ALL files in the list before exiting.
Note: A semaphore older than 20 seconds is considered as invalid and
will immediately be deleted.
Markus Buehren
Last modified 13.11.2007
See also REMOVEFILESEMAPHORE.