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- ;/* allocate.c - Execute me to compile me with SAS C 5.10
- LC -b1 -cfistq -v -y -j73 allocate.c
- Blink FROM LIB:c.o,allocate.o TO allocate LIBRARY LIB:LC.lib,LIB:Amiga.lib
- quit ;
-
- allocate.c - example of allocating and using a private memory pool.
-
-
- Copyright (c) 1992 Commodore-Amiga, Inc.
-
- This example is provided in electronic form by Commodore-Amiga, Inc. for
- use with the "Amiga ROM Kernel Reference Manual: Libraries", 3rd Edition,
- published by Addison-Wesley (ISBN 0-201-56774-1).
-
- The "Amiga ROM Kernel Reference Manual: Libraries" contains additional
- information on the correct usage of the techniques and operating system
- functions presented in these examples. The source and executable code
- of these examples may only be distributed in free electronic form, via
- bulletin board or as part of a fully non-commercial and freely
- redistributable diskette. Both the source and executable code (including
- comments) must be included, without modification, in any copy. This
- example may not be published in printed form or distributed with any
- commercial product. However, the programming techniques and support
- routines set forth in these examples may be used in the development
- of original executable software products for Commodore Amiga computers.
-
- All other rights reserved.
-
- This example is provided "as-is" and is subject to change; no
- warranties are made. All use is at your own risk. No liability or
- responsibility is assumed.
- */
-
- #include <exec/types.h>
- #include <exec/memory.h>
- #include <clib/exec_protos.h>
- #include <stdio.h>
- #include <stdlib.h>
-
- #ifdef LATTICE
- int CXBRK(void) { return(0); } /* Disable Lattice CTRL/C handling */
- void chkabort(void) { return; } /* really */
- #endif
-
- #define BLOCKSIZE 4000 /* or whatever you need */
-
- VOID main(VOID)
- {
- struct MemHeader *mh;
- struct MemChunk *mc;
- APTR block1, block2;
-
- /* Get the MemHeader needed to keep track of our new block. */
- mh = (struct MemHeader *)AllocMem((LONG)sizeof(struct MemHeader), MEMF_CLEAR);
- if (!mh) exit(10);
-
- /* Get the actual block the above MemHeader will manage. */
- if ( !(mc = (struct MemChunk *)AllocMem(BLOCKSIZE, 0)) )
- {
- FreeMem(mh, (LONG)sizeof(struct MemHeader));
- exit(10);
- }
- mh->mh_Node.ln_Type = NT_MEMORY;
- mh->mh_First = mc;
- mh->mh_Lower = (APTR)mc;
- mh->mh_Upper = (APTR)(BLOCKSIZE + (ULONG)mc);
- mh->mh_Free = BLOCKSIZE;
-
- mc->mc_Next = NULL; /* Set up first chunk in the freelist */
- mc->mc_Bytes = BLOCKSIZE;
-
- block1 = (APTR)Allocate(mh,20);
- block2 = (APTR)Allocate(mh, 314);
-
- printf("Our MemHeader struct at $%lx. Our block of memory at $%lx\n", mh, mc);
- printf("Allocated from our pool: block1 at $%lx, block2 at $%lx\n", block1, block2);
-
- FreeMem(mh, (LONG)sizeof(struct MemHeader));
- FreeMem(mc, (LONG)BLOCKSIZE);
- }