1.1.1.0 image.haslock

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image.haslock - Function

1.1.1 Does this image have any locks set?

Description

This function can be used to find out whether the image has a read or a write lock set. It is not of general user interest. It returns a vector of Booleans of length 2. Position 1 says whether a read lock is set, position 2 says whether a write lock is set.

In general locking is handled automatically, with a built in lock release cycle. However, this function can be useful in scripts when a file is being shared between more than one process. See also functions unlock and lock.

Arguments

Returns
boolArray

Example

"""
#
print "\t----\t haslock Ex 1 \t----"
ia.maketestimage(’xx’,overwrite=true)
ia.lock(writelock=T)
print ia.haslock()
#[True, True]
ia.unlock()
print ia.haslock()
#[False, False]
ia.lock(F)
print ia.haslock()
#[True, False]
ia.close()
#
"""

This example acquires a read/write lock on the file and then unlocks it
and acquires just a read lock.

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