344 lines
8.1 KiB
C
344 lines
8.1 KiB
C
/*************************************************************************
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* *
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* YAP Prolog *
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* *
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* Yap Prolog was developed at NCCUP - Universidade do Porto *
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* *
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* Copyright L.Damas, V.S.Costa and Universidade do Porto 1985-1997 *
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* *
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**************************************************************************
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* *
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* File: bb.c *
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* Last rev: 12/29/99 *
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* mods: *
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* comments: YAP's blackboard routines *
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* *
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*************************************************************************/
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#ifdef SCCS
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static char SccsId[] = "%W% %G%";
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#endif
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#include "Yap.h"
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#include "Yatom.h"
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#include "Heap.h"
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#ifndef NULL
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#define NULL (void *)0
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#endif
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static BBProp
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PutBBProp(AtomEntry *ae, SMALLUNSGN mod) /* get BBentry for at; */
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{
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Prop p0;
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BBProp p;
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WRITE_LOCK(ae->ARWLock);
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p = RepBBProp(p0 = ae->PropsOfAE);
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while (p0 != NIL && (!IsBBProperty(p->KindOfPE) ||
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(p->ModuleOfBB != mod))) {
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p = RepBBProp(p0 = p->NextOfPE);
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}
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if (p0 == NIL) {
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p = (BBProp)_YAP_AllocAtomSpace(sizeof(*p));
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if (p == NULL) {
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WRITE_UNLOCK(ae->ARWLock);
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_YAP_Error(SYSTEM_ERROR,ARG1,"could not allocate space in bb_put/2");
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return(NULL);
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}
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p->NextOfPE = ae->PropsOfAE;
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ae->PropsOfAE = AbsBBProp(p);
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p->ModuleOfBB = mod;
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p->Element = NULL;
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p->KeyOfBB = AbsAtom(ae);
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p->KindOfPE = BBProperty;
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INIT_RWLOCK(p->BBRWLock);
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}
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WRITE_UNLOCK(ae->ARWLock);
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return (p);
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}
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static BBProp
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PutIntBBProp(Int key, SMALLUNSGN mod) /* get BBentry for at; */
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{
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Prop p0;
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BBProp p;
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UInt hash_key;
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if (INT_BB_KEYS == NULL) {
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INT_BB_KEYS = (Prop *)_YAP_AllocCodeSpace(sizeof(Prop)*INT_BB_KEYS_SIZE);
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if (INT_BB_KEYS != NULL) {
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UInt i = 0;
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Prop *pp = INT_BB_KEYS;
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for (i = 0; i < INT_BB_KEYS_SIZE; i++) {
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pp[0] = NIL;
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pp++;
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}
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} else {
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_YAP_Error(SYSTEM_ERROR,ARG1,"could not allocate space in bb_put/2");
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return(NULL);
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}
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}
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hash_key = (CELL)key % INT_BB_KEYS_SIZE;
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p0 = INT_BB_KEYS[hash_key];
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p = RepBBProp(p0);
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while (p0 != NIL && (!IsBBProperty(p->KindOfPE) ||
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key != (Int)(p->KeyOfBB) ||
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(p->ModuleOfBB != mod))) {
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p = RepBBProp(p0 = p->NextOfPE);
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}
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if (p0 == NIL) {
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YAPEnterCriticalSection();
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p = (BBProp)_YAP_AllocAtomSpace(sizeof(*p));
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if (p == NULL) {
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YAPLeaveCriticalSection();
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_YAP_Error(SYSTEM_ERROR,ARG1,"could not allocate space in bb_put/2");
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return(NULL);
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}
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p->ModuleOfBB = mod;
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p->Element = NULL;
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p->KeyOfBB = (Atom)key;
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p->KindOfPE = BBProperty;
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p->NextOfPE = INT_BB_KEYS[hash_key];
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INT_BB_KEYS[hash_key] = AbsBBProp(p);
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YAPLeaveCriticalSection();
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}
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return (p);
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}
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static BBProp
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GetBBProp(AtomEntry *ae, SMALLUNSGN mod) /* get BBentry for at; */
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{
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Prop p0;
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BBProp p;
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READ_LOCK(ae->ARWLock);
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p = RepBBProp(p0 = ae->PropsOfAE);
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while (p0 != NIL && (!IsBBProperty(p->KindOfPE) ||
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(p->ModuleOfBB != mod))) {
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p = RepBBProp(p0 = p->NextOfPE);
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}
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READ_UNLOCK(ae->ARWLock);
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if (p0 == NIL) {
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return(NULL);
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}
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return (p);
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}
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static BBProp
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GetIntBBProp(Int key, SMALLUNSGN mod) /* get BBentry for at; */
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{
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Prop p0;
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BBProp p;
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UInt hash_key;
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if (INT_BB_KEYS == NULL)
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return(NULL);
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hash_key = (CELL)key % INT_BB_KEYS_SIZE;
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p0 = INT_BB_KEYS[hash_key];
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p = RepBBProp(p0);
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while (p0 != NIL && (!IsBBProperty(p->KindOfPE) ||
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key != (Int)(p->KeyOfBB) ||
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(p->ModuleOfBB != mod))) {
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p = RepBBProp(p0 = p->NextOfPE);
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}
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if (p0 == NIL) {
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return(NULL);
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}
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return (p);
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}
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static int
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resize_bb_int_keys(UInt new_size) {
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Prop *new;
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UInt i;
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YAPEnterCriticalSection();
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if (INT_BB_KEYS == NULL) {
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INT_BB_KEYS_SIZE = new_size;
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YAPLeaveCriticalSection();
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return(TRUE);
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}
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new = (Prop *)_YAP_AllocCodeSpace(sizeof(Prop)*new_size);
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if (new == NULL) {
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YAPLeaveCriticalSection();
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_YAP_Error(SYSTEM_ERROR,ARG1,"could not allocate space");
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return(FALSE);
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}
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for (i = 0; i < new_size; i++) {
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new[i] = NIL;
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}
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for (i = 0; i < INT_BB_KEYS_SIZE; i++) {
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if (INT_BB_KEYS[i] != NIL) {
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Prop p0 = INT_BB_KEYS[i];
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while (p0 != NIL) {
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BBProp p = RepBBProp(p0);
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CELL key = (CELL)(p->KeyOfBB);
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UInt hash_key = (CELL)key % new_size;
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p0 = p->NextOfPE;
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p->NextOfPE = new[hash_key];
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new[hash_key] = AbsBBProp(p);
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}
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}
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}
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_YAP_FreeCodeSpace((char *)INT_BB_KEYS);
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INT_BB_KEYS = new;
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INT_BB_KEYS_SIZE = new_size;
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YAPLeaveCriticalSection();
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return(TRUE);
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}
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static BBProp
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AddBBProp(Term t1, char *msg, SMALLUNSGN mod)
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{
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BBProp p;
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restart:
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if (IsVarTerm(t1)) {
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_YAP_Error(INSTANTIATION_ERROR, t1, msg);
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return(NULL);
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} if (IsAtomTerm(t1)) {
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p = PutBBProp(RepAtom(AtomOfTerm(t1)), mod);
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} else if (IsIntegerTerm(t1)) {
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p = PutIntBBProp(IntegerOfTerm(t1), mod);
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} else if (IsApplTerm(t1) && FunctorOfTerm(t1) == FunctorModule) {
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Term tmod = ArgOfTerm(1, t1);
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if (!IsVarTerm(tmod) ) {
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t1 = ArgOfTerm(2, t1);
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mod = _YAP_LookupModule(tmod);
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goto restart;
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} else {
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_YAP_Error(INSTANTIATION_ERROR, t1, msg);
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return(NULL);
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}
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} else {
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_YAP_Error(TYPE_ERROR_ATOM, t1, msg);
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return(NULL);
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}
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return(p);
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}
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static BBProp
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FetchBBProp(Term t1, char *msg, SMALLUNSGN mod)
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{
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BBProp p;
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restart:
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if (IsVarTerm(t1)) {
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_YAP_Error(INSTANTIATION_ERROR, t1, msg);
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return(NULL);
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} if (IsAtomTerm(t1)) {
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p = GetBBProp(RepAtom(AtomOfTerm(t1)), mod);
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} else if (IsIntegerTerm(t1)) {
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p = GetIntBBProp(IntegerOfTerm(t1), mod);
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} else if (IsApplTerm(t1) && FunctorOfTerm(t1) == FunctorModule) {
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Term tmod = ArgOfTerm(1, t1);
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if (!IsVarTerm(tmod) ) {
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mod = _YAP_LookupModule(tmod);
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t1 = ArgOfTerm(2, t1);
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goto restart;
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} else {
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_YAP_Error(INSTANTIATION_ERROR, t1, msg);
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return(NULL);
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}
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} else {
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_YAP_Error(TYPE_ERROR_ATOM, t1, msg);
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return(NULL);
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}
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return(p);
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}
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static Int
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p_bb_put(void)
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{
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Term t1 = Deref(ARG1);
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BBProp p = AddBBProp(t1, "bb_put/2", CurrentModule);
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if (p == NULL)
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return(FALSE);
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WRITE_LOCK(p->BBRWLock);
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if (p->Element != NULL) {
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_YAP_ReleaseTermFromDB(p->Element);
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}
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p->Element = _YAP_StoreTermInDB(2,2);
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WRITE_UNLOCK(p->BBRWLock);
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return(p->Element != NULL);
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}
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static Int
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p_bb_get(void)
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{
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Term t1 = Deref(ARG1);
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BBProp p = FetchBBProp(t1, "bb_get/2", CurrentModule);
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Term out;
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if (p == NULL || p->Element == NULL)
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return(FALSE);
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READ_LOCK(p->BBRWLock);
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out = _YAP_FetchTermFromDB(p->Element,3);
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READ_UNLOCK(p->BBRWLock);
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return(_YAP_unify(ARG2,out));
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}
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static Int
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p_bb_delete(void)
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{
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Term t1 = Deref(ARG1);
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BBProp p;
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Term out;
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p = FetchBBProp(t1, "bb_delete/2", CurrentModule);
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if (p == NULL || p->Element == NULL)
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return(FALSE);
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out = _YAP_FetchTermFromDB(p->Element,3);
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WRITE_LOCK(p->BBRWLock);
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_YAP_ReleaseTermFromDB(p->Element);
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p->Element = NULL;
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WRITE_UNLOCK(p->BBRWLock);
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return(_YAP_unify(ARG2,out));
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}
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static Int
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p_bb_update(void)
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{
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Term t1 = Deref(ARG1);
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BBProp p;
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Term out;
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p = FetchBBProp(t1, "bb_update/3", CurrentModule);
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if (p == NULL || p->Element == NULL)
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return(FALSE);
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WRITE_LOCK(p->BBRWLock);
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out = _YAP_FetchTermFromDB(p->Element,3);
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if (!_YAP_unify(ARG2,out)) {
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WRITE_UNLOCK(p->BBRWLock);
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return(FALSE);
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}
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_YAP_ReleaseTermFromDB(p->Element);
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p->Element = _YAP_StoreTermInDB(3,3);
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WRITE_UNLOCK(p->BBRWLock);
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return(p->Element != NULL);
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}
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static Int
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p_resize_bb_int_keys(void)
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{
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Term t1 = Deref(ARG1);
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if (IsVarTerm(t1)) {
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return(_YAP_unify(ARG1,MkIntegerTerm((Int)INT_BB_KEYS_SIZE)));
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}
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if (!IsIntegerTerm(t1)) {
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_YAP_Error(TYPE_ERROR_INTEGER, t1, "yap_flag(resize_bb_int_keys,T)");
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return(FALSE);
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}
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return(resize_bb_int_keys(IntegerOfTerm(t1)));
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}
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void
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_YAP_InitBBPreds(void)
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{
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_YAP_InitCPred("bb_put", 2, p_bb_put, 0);
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_YAP_InitCPred("bb_get", 2, p_bb_get, 0);
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_YAP_InitCPred("bb_delete", 2, p_bb_delete, 0);
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_YAP_InitCPred("bb_update", 3, p_bb_update, 0);
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_YAP_InitCPred("$resize_bb_int_keys", 1, p_resize_bb_int_keys, SafePredFlag|SyncPredFlag);
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}
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