1.1.1.0 image.lock

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image.lock - Function

1.1.1 Acquire a lock on the image

Description

This function can be used to acquire a Read or a Read/Write lock on the image file. It is not of general user interest.

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 haslock.

Arguments


Inputs
writelock	Acquire a read/write (T) or a readonly (F) lock
	allowed:	bool
	Default:	false
nattempts	Number of attempts, > 0. Default is unlimiited.
	allowed:	int
	Default:	0

Returns
bool

Example

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

This acquires a read/write lock on the file. Then we unlock it
and acquire a readonly lock.

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