SHPCLMOVE(3F)SHPCLMOVE(3F)NAMESHPCLMOVE - Extends a symmetric heap block or copies the contents of
the block into a larger block
SYNOPSIS
POINTER (addr, A(1))
INTEGER length, status, abort
CALL SHPCLMOVE (addr, length, status, abort)
DESCRIPTION
The SHPCLMOVE function either extends a symmetric heap block if the
block is followed by a large enough free block or copies the contents
of the existing block to a larger block and returns a status code
indicating that the block was moved. This function also can reduce
the size of a block if the new length is less than the old length.
All processing elements (PEs) in a program must call SHPCLMOVE with
the same value of addr to maintain symmetric heap consistency; if any
PEs are missing, the program hangs.
The SHPCLMOVE function accepts the following arguments:
Argument Description
addr On entry, first word address of the block to change; on
exit, the new address of the block if it was moved.
length Requested new total length in words (input). One word
is 32 bits.
status Status is 0 if the block was extended in place, 1 if it
was moved, and a negative integer for the type of error
detected (output).
abort Abort code. Nonzero requests abort on error; 0
requests an error code (input).
RETURN VALUES
Error conditions are as follows:
Code Condition
-1 Length is not an integer greater than 0.
-2 No more memory is available from the system (checked if
the block cannot be extended and the free space list
does not include a large enough block).
-3 Address is outside the bounds of the symmetric heap.
-4 Block is already free.
-5 Address is not at the beginning of a block.
SEE ALSOintro_shmem(3), shmalloc(3F), shpalloc(3F), shpdeallc(3F)
