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GuruMeditation
Docs » Autodocs » exec.library » AllocEntry

NAME

	AllocEntry -- allocate many regions of memory

SYNOPSIS

	memList = AllocEntry(memList)
D0 A0
struct MemList *AllocEntry(struct MemList *);

FUNCTION

	This function takes a memList structure and allocates enough memory
to hold the required memory as well as a MemList structure to keep
track of it.
These MemList structures may be linked together in a task control
block to keep track of the total memory usage of this task. (See
the description of TC_MEMENTRY under RemTask).

INPUTS

	memList -- A MemList structure filled in with MemEntry structures.

RESULT

	memList -- A different MemList filled in with the actual memory
allocated in the me_Addr field, and their sizes in me_Length.
If enough memory cannot be obtained, then the requirements of
the allocation that failed is returned and bit 31 is set.
WARNING: The result is unusual! Bit 31 indicates failure.
EXAMPLES
The user wants five regions of 2, 4, 8, 16, and 32 bytes in size
with requirements of MEMF_CLEAR, MEMF_PUBLIC, MEMF_CHIP!MEMF_CLEAR,
MEMF_CLEAR, and MEMF_PUBLIC!MEMF_CLEAR respectively. The
following code fragment would do that:
MemListDecl:
DS.B LN_SIZE * reserve space for list node
DC.W 5 * number of entries
DC.L MEMF_CLEAR * entry #0
DC.L 2
DC.L MEMF_PUBLIC * entry #1
DC.L 4
DC.L MEMF_CHIP!MEMF_CLEAR * entry #2
DC.L 8
DC.L MEMF_CLEAR * entry #3
DC.L 16
DC.L MEMF_PUBLIC!MEMF_CLEAR * entry #4
DC.L 32
start:
LEA.L MemListDecl(PC),A0
JSR _LVOAllocEntry(a6)
BCLR.L #31,D0
BEQ.S success
------- Type of memory that we failed on is in D0

BUGS

	If any one of the allocations fails, this function fails to back
out fully. This is fixed by the "SetPatch" program on V1.3
Workbench disks.

SEE ALSO

<exec/memory.h>

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