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View of /sml/trunk/src/runtime/c-libs/smlnj-runtime/gc-ctl.c

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Revision 569 - (download) (as text) (annotate)
Tue Mar 7 04:01:07 2000 UTC (19 years, 4 months ago) by blume
File size: 2510 byte(s)
- size info in BOOTLIST
     * no fixed upper limits for number of bootfiles or length of
       bootfile names in runtime
     * falling back to old behavior if no BOOTLIST size info found
- allocation size heuristics in .run-sml
     * tries to read cache size from /proc/cpuinfo (this is important for
        small-cache Celeron systems!)
- install.sh robustified
- CM manual updates
- paranoid mode
     * no more CMB.deliver() (i.e., all done by CMB.make())
     * can re-use existing sml.boot.* files
     * init.cmi now treated as library
     * library stamps for consistency checks
- sml.boot.<arch>-<os>/PIDMAP file
     * This file is read by the CM startup code.  This is used to minimize
       the amount of dynamic state that needs to be stowed away for the
       purpose of sharing between interactive system and user code.
- CM.Anchor.anchor instead of CM.Anchor.{set,cancel}
     * Upon request by Elsa.  Anchors now controlled by get-set-pair
       like most other CM state variables.
- Compiler.CMSA eliminated
     * No longer supported by CM anyway.
- fixed bugs in pickler that kept biting Stefan
     * past refs to past refs (was caused by the possibility that
       ad-hoc sharing is more discriminating than hash-cons sharing)
     * integer overflow on LargeInt.minInt
- ml-{lex,yacc} build scripts now use new mechanism
  for building standalone programs
- fixed several gcc -Wall warnings that were caused by missing header
  files, missing initializations, etc., in runtime (not all warnings
  eliminated, though)
/* gc-ctl.c
 *
 * COPYRIGHT (c) 1994 by AT&T Bell Laboratories.
 *
 * General interface for GC control functions.
 */

#include "ml-base.h"
#include "ml-values.h"
#include "ml-state.h"
#include "memory.h"
#include "heap.h"
#include "ml-objects.h"
#include "cfun-proto-list.h"

#define STREQ(s1, s2)	(strcmp((s1), STR_MLtoC(s2)) == 0)

PVT void SetVMCache (ml_state_t *msp, ml_val_t arg);
PVT void DoGC (ml_state_t *msp, ml_val_t arg);
PVT void AllGC (ml_state_t *msp);



/* _ml_RunT_gc_ctl : (string * int ref) list -> unit
 *
 * Current control operations:
 *
 *   ("SetVMCache", ref n)	- sets VM cache level to n; returns old cache
 *				  level.
 *   ("DoGC", ref n)		- does a GC of the first "n" generations
 *   ("AllGC", _)		- collects all generations.
 *   ("Messages", ref 0)	- turn GC messages off
 *   ("Messages", ref n)	- turn GC messages on (n > 0)
 */
ml_val_t _ml_RunT_gc_ctl (ml_state_t *msp, ml_val_t arg)
{
    while (arg != LIST_nil) {
	ml_val_t	cmd = LIST_hd(arg);
	ml_val_t	oper = REC_SEL(cmd, 0);
	ml_val_t	cell = REC_SEL(cmd, 1);

	if (STREQ("SetVMCache", oper))
	    SetVMCache (msp, cell);
	else if (STREQ("DoGC", oper))
	    DoGC (msp, cell);
	else if (STREQ("AllGC", oper))
	    AllGC (msp);
	else if (STREQ("Messages", oper)) {
	    if (INT_MLtoC(DEREF(cell)) > 0)
		GCMessages = TRUE;
	    else
		GCMessages = FALSE;
	}

	arg = LIST_tl(arg);
    }

    return ML_unit;

} /* end of _ml_RunT_gc_ctl */


/* SetVMCache:
 *
 * Set the VM cache generation, return the old level.
 */
PVT void SetVMCache (ml_state_t *msp, ml_val_t arg)
{
    int		level = INT_MLtoC(DEREF(arg));
    heap_t	*heap = msp->ml_heap;

    if (level < 0)
	level = 0;
    else if (level > MAX_NUM_GENS)
	level = MAX_NUM_GENS;

    if (level < heap->cacheGen) {
      /* Free any cached memory objects. */
	int		i;
	for (i = level;  i < heap->cacheGen;  i++)
	    MEM_FreeMemObj (heap->gen[i]->cacheObj);
    }

    ASSIGN(arg, INT_CtoML(heap->cacheGen));
    heap->cacheGen = level;

} /* end of SetVMCache */


/* DoGC:
 *
 * Force a garbage collection of the given level.
 */
PVT void DoGC (ml_state_t *msp, ml_val_t arg)
{
    heap_t	*heap = msp->ml_heap;
    int		level = INT_MLtoC(DEREF(arg));

    if (level < 0)
	level = 0;
    else if (heap->numGens < level)
	level = heap->numGens;

    InvokeGC (msp, level);

} /* end of DoGC */


/* AllGC:
 *
 * Force a garbage collection of all generations.
 */
PVT void AllGC (ml_state_t *msp)
{
    InvokeGC (msp, msp->ml_heap->numGens);

} /* end of AllGC */


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