Name
lock
Synopsis
lockvar
locksub
Locks a variable or a subroutine. A lock on a variable is
maintained until the lock goes out of scope. If the variable is
already locked by another thread, the lock
call blocks until the variable is
available. You can recursively lock the variable, which stays
locked until the outermost lock goes out of scope.
Note that locks on variables affect only other lock
calls; they don’t prevent normal
access to a variable. Also, locking a container object (e.g., an
array) doesn’t lock each element of the container.
Locking a subroutine blocks any calls to the subroutine until the lock goes out of scope; no other thread can access the subroutine while the lock is in effect.
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