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#ifndef lint
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static const char RCSid[] = "$Id: palloc.c,v 1.3 2003/07/21 22:30:18 schorsch Exp $";
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#endif
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/*
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* Limited dynamic storage allocator for primitives
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*/
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#define FBSIZE 72 /* size of malloc call */
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#include "meta.h"
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#include "rtio.h"
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extern int maxalloc; /* number of prims to allocate */
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int nalloc = 0; /* number allocated so far */
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static PLIST freelist = {NULL, NULL};
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static int morefree(void);
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PRIMITIVE *
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palloc(void) /* allocate a primitive */
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{
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register PRIMITIVE *p;
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if (maxalloc > 0 && nalloc >= maxalloc)
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return(NULL);
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if ((p = pop(&freelist)) == NULL) {
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if (morefree())
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p = pop(&freelist);
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else {
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sprintf(errmsg, "out of memory in palloc (nalloc = %d)", nalloc);
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error(SYSTEM, errmsg);
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}
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}
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nalloc++;
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return(p);
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}
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void
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pfree( /* free a primitive */
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register PRIMITIVE *p
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)
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{
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if (p->args != NULL) {
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freestr(p->args);
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p->args = NULL;
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}
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push(p, &freelist);
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nalloc--;
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}
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void
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plfree( /* free a primitive list */
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register PLIST *pl
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)
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{
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register PRIMITIVE *p;
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for (p = pl->ptop; p != NULL; p = p->pnext) {
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if (p->args != NULL) {
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freestr(p->args);
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p->args = NULL;
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}
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nalloc--;
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}
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append(pl, &freelist);
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pl->ptop = pl->pbot = NULL;
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}
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static int
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morefree(void) /* get more free space */
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{
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register PRIMITIVE *p;
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register int i;
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int rnu;
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if (maxalloc > 0 && (i = maxalloc-nalloc) < FBSIZE)
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rnu = i;
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else
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rnu = i = FBSIZE;
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p = (PRIMITIVE *)malloc((unsigned)i * sizeof(PRIMITIVE));
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if (p == NULL)
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return(0);
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while (i--) {
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p->args = NULL;
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push(p, &freelist);
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p++;
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}
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return(rnu);
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}
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