Interlisp.maiko/src/gcr.c

/* $Id: gcr.c,v 1.3 1999/05/31 23:35:32 sybalsky Exp $ (C) Copyright Venue, All Rights Reserved  */

/************************************************************************/
/*									*/
/*	(C) Copyright 1989-95 Venue. All Rights Reserved.		*/
/*	Manufactured in the United States of America.			*/
/*									*/
/************************************************************************/
/*                                                                      */
/*                       File Name : gcr.c				*/
/*                                                                       */
/*************************************************************************/
/*                                                                       */
/*                      Creation Date : Oct-12-1987                      */
/*                      Written by Tomoru Teruuchi                       */
/*                                                                       */
/*************************************************************************/
/*           Functions : gcarrangementstack()                            */
/*			 doreclaim();                                    */
/*                       dogc01();                                       */
/*                       disablegc1(noerror);                            */
/*                                                                       */
/*************************************************************************/
/*           Description :						 */
/* This files' functions is the invocator that may invoke the reclaimer. */
/*  gcarrangementstack()						 */
/*	This function's role is  narrowing the gap between the		 */
/*      contextswitch and the subrcall.					 */
/*	In the original Lisp Source, as the contextswitch process may    */
/*	clear the remain area to FSB, there is no problem in scanning	 */
/*	stack. But in the subrcall,there isn't such process.		 */
/*	Therefore, the function is required to set the remain stack area */
/*	 to FSB. And this function does so.				 */
/*  dogc01()								 */
/*	This function is the mere caller of the reclaimer.		 */
/*	The callees are gcscanstack(), gcmapscan() and gcunmapscan().    */
/*  doreclaim()								 */
/*	This function is the real top level function of the reclaimer.   */
/*	But currently this function is not used(may be used in Future.)  */
/*	This function may have a problem. It is to manipulate "clock"    */
/*	for keeping the GC's time period.				 */
/*   disablegc1(noerror)						 */
/*      This function is the rescue function,when the HTcoll table is    */
/*      overflow and so on.After this function's process is over, the    */
/*      keyhandler will sense the interrupt table state and call the     */
/*      function \DOGCDISABLEDINTERRUPT for reporting to Users that      */
/*      this system status is dangerous and you should save your works.  */
/*                                                                       */
/*************************************************************************/
/*                                                               \tomtom */
/*************************************************************************/

#include "version.h"

#include "address.h"       // for LOLOC
#include "adr68k.h"        // for Addr68k_from_LADDR, LADDR_from_68k
#include "commondefs.h"    // for error
#include "dspsubrsdefs.h"  // for flip_cursor
#include "emlglob.h"
#include "gcmain3defs.h"   // for gcmapscan, gcmapunscan, gcscanstack
#include "gcrdefs.h"       // for disablegc1, dogc01, doreclaim, gcarrangeme...
#include "lispemul.h"      // for state, NIL, DLword, CurrentStackPTR, ATOM_T
#include "lspglob.h"       // for MiscStats, GcDisabled_word, Reclaim_cnt_word
#include "lsptypes.h"      // for GETWORD, TT_NOREF
#include "miscstat.h"      // for MISCSTATS
#include "stack.h"         // for STK_FSB_WORD, frameex1
#include "timerdefs.h"     // for update_miscstats

#ifndef BYTESWAP
struct interruptstate {
  unsigned nil1 : 3;
  unsigned gcdisabled : 1;
  unsigned vmemfull : 1;
  unsigned stackoverflow : 1;
  unsigned storagefull : 1;
  unsigned waitinginterrupt : 1;
  unsigned nil2 : 8;
  DLword intcharcode;
};
#else
struct interruptstate {
  DLword intcharcode;
  unsigned nil2 : 8;
  unsigned waitinginterrupt : 1;
  unsigned storagefull : 1;
  unsigned stackoverflow : 1;
  unsigned vmemfull : 1;
  unsigned gcdisabled : 1;
  unsigned nil1 : 3;
};
#endif /* BYTESWAP */

void gcarrangementstack(void) {
  LispPTR tmpnextblock;
  PushCStack;
  tmpnextblock = LADDR_from_68k(CurrentStackPTR += DLWORDSPER_CELL);
  CURRENTFX->nextblock = LOLOC(tmpnextblock);
  if ((UNSIGNED)EndSTKP == (UNSIGNED)CurrentStackPTR) error("creating 0-long stack block.");
  GETWORD(CurrentStackPTR) = STK_FSB_WORD;
  GETWORD(CurrentStackPTR + 1) = (((UNSIGNED)EndSTKP - (UNSIGNED)CurrentStackPTR) >> 1);
}

/****************************************************************/
/* The following function is the caller that is the reclaimer.  */
/* And, this function is same as \DOGC1 in Lisp because in the  */
/* C's implementation the contextswitch is not required for the */
/* remaining the system status.					*/
/****************************************************************/

void dogc01(void) {
  gcarrangementstack();
  gcscanstack();
  gcmapscan();
  gcmapunscan();
  PopCStack;
}

/*!!!!!! should update clock in Miscstats */

void doreclaim(void) {
  MISCSTATS gcmisc;

  if (*GcDisabled_word == NIL) {
    update_miscstats();
    gcmisc = *((MISCSTATS *)MiscStats);
    *Reclaim_cnt_word = NIL;
    if (*GcMess_word != NIL) flip_cursor();
    dogc01();
    if (*GcMess_word != NIL) flip_cursor();
    *Reclaim_cnt_word = *ReclaimMin_word;
    update_miscstats();
    MiscStats->gctime = MiscStats->gctime + MiscStats->totaltime - gcmisc.totaltime +
                        MiscStats->swapwaittime - gcmisc.swapwaittime;
  }
}

void disablegc1(int noerror) {
  struct interruptstate *gcinterruptstate;
  int count, i;
  DLword typeword;
  gcinterruptstate = (struct interruptstate *)Addr68k_from_LADDR(*INTERRUPTSTATE_word);
  count = (128) * 256; /* This is test value. 128 is *MdsTTsize(\MDSTTsize) */
  for (i = 0; i < count; i++) {
    typeword = GETWORD((DLword *)Addr68k_from_LADDR(LADDR_from_68k(MDStypetbl) + i));
    GETWORD((DLword *)Addr68k_from_LADDR(LADDR_from_68k(MDStypetbl) + i)) = (typeword | TT_NOREF);
  }
  *Reclaim_cnt_word = NIL;
  *ReclaimMin_word = NIL;
  if ((noerror == NIL) && (*GcDisabled_word == NIL)) {
    gcinterruptstate->gcdisabled = T;
    *PENDINGINTERRUPT_word = ATOM_T;
  };
  *GcDisabled_word = ATOM_T;
}