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Docs » Autodocs » amiga.lib » LibFreePooled
LibFreePooled -- Free pooled memory (V33)
LibFreePooled(poolHeader,memory,memSize)
a0 a1 d0
void LibFreePooled(void *,void *,ULONG);
This function is a copy of the pool functions in V39 and up of
EXEC. In fact, if you are running in V39, this function will
notice and call the EXEC function. This function works in
V33 and up (1.2) Amiga system.
The C code interface is _LibFreePooled() and takes its arguments
from the stack just like the C code interface for FreePooled()
in amiga.lib. The assembly code interface is with the symbol
_AsmFreePooled: and takes the parameters in registers with the
additional parameter of ExecBase being in a6 which can be used
from SAS/C 6 by a prototype of:
void __asm AsmFreePooled(register __a0 void *,
register __a1 void *,
register __d0 ULONG,
register __a6 struct ExecBase *);
Deallocates memory allocated by LibAllocPooled(). The size of the
allocation *MUST* match the size given to LibAllocPooled().
The reason the pool functions do not track individual allocation
sizes is because many of the uses of pools have small allocation
sizes and the tracking of the size would be a large overhead.
Only memory allocated by LibAllocPooled() may be freed with this
function!
Doing a LibDeletePool() on the pool will free all of the puddles
and thus all of the allocations done with LibAllocPooled() in that
pool. (No need to LibFreePooled() each allocation)
memory - pointer to memory allocated by AllocPooled.
poolHeader - a specific private pool header.
The pool function do not protect an individual pool from
multiple accesses. The reason is that in most cases the pools
will be used by a single task. If your pool is going to
be used by more than one task you must Semaphore protect
the pool from having more than one task trying to allocate
within the same pool at the same time. Warning: Forbid()
protection *will not work* in the future. *Do NOT* assume
that we will be able to make it work in the future. LibFreePooled()
may well break a Forbid() and as such can only be protected
by a semaphore.
To track sizes yourself, the following code can be used:
*Assumes a6=ExecBase*
;
; Function to do AllocVecPooled(Pool,memSize)
;
AllocVecPooled: addq.l #4,d0 ; Get space for tracking
move.l d0,-(sp) ; Save the size
jsr LibAllocPooled ; Call pool...
move.l (sp)+,d1 ; Get size back...
tst.l d0 ; Check for error
beq.s avp_fail ; If NULL, failed!
move.l d0,a0 ; Get pointer...
move.l d1,(a0)+ ; Store size
move.l a0,d0 ; Get result
avp_fail: rts ; return
;
; Function to do LibFreeVecPooled(pool,memory)
;
FreeVecPooled: move.l -(a1),d0 ; Get size / ajust pointer
jmp LibFreePooled
AllocPooled, CreatePool, DeletePool, LibAllocPooled(), LibCreatePool(), LibDeletePool()
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