Program cache is used to share a single memory image of a program or library between different processes. It is available only on dL4 for Unix, version 3.1 or later. The environment variable "DL4CACHE" must be set in order to use program caching. The value of DL4CACHE is a file specification of the form " [blocks:blocksize] name". The following example specifies a global cache of 8 megabytes:

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The operating system must be configured to support both shared memory and semaphores.

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