rmallocmap() dynamically allocates a resource map structure. The argument mapsize defines the total number of entries in the map. In particular, it
is the total number of allocations that can be outstanding at any one time.
rmallocmap() initializes the map but does not associate it with the actual resource. In order to associate the map with the actual resource, a call to rmfree(9F) is used to make the entirety of the actual resource available for allocation, starting from the first index into the
resource. Typically, the call to rmallocmap() is followed by a call to rmfree(9F),
passing the address of the map returned from rmallocmap(), the total size of the resource, and the first index into the actual resource.
The resource map allocated by rmallocmap() can be used to describe an arbitrary resource in whatever allocation units are appropriate, such as blocks, pages, or data structures.
This resource can then be managed by the system by subsequent calls to rmalloc(9F), rmalloc_wait(9F), and rmfree(9F).
rmallocmap_wait() is similar to rmallocmap(), with the exception that it will wait for space to become available if necessary.
rmfreemap() deallocates a resource map structure previously allocated by rmallocmap() or rmallocmap_wait(). The argument mp
is a pointer to the map structure to be deallocated.
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