1: #ifndef __PETSCCTABLE_H
  3:  #include <petscsys.h>

  5: struct _n_PetscTable {
  6:   PetscInt *keytable;
  7:   PetscInt *table;
  8:   PetscInt count;
  9:   PetscInt tablesize;
 10:   PetscInt head;
 11:   PetscInt maxkey;   /* largest key allowed */
 12: };

 14: typedef struct _n_PetscTable* PetscTable;
 15: typedef PetscInt* PetscTablePosition;

 17: PETSC_STATIC_INLINE unsigned long PetscHash(PetscTable ta,unsigned long x)
 18: {
 20:   PetscFunctionReturn(x%(unsigned long)ta->tablesize);
 21: }

 23: PETSC_STATIC_INLINE unsigned long PetscHashStep(PetscTable ta,unsigned long x)
 24: {
 26:   PetscFunctionReturn(1+(x%(unsigned long)(ta->tablesize-1)));
 27: }

 29: PETSC_EXTERN PetscErrorCode PetscTableCreate(const PetscInt,PetscInt,PetscTable*);
 30: PETSC_EXTERN PetscErrorCode PetscTableCreateCopy(const PetscTable,PetscTable*);
 31: PETSC_EXTERN PetscErrorCode PetscTableDestroy(PetscTable*);
 32: PETSC_EXTERN PetscErrorCode PetscTableGetCount(const PetscTable,PetscInt*);
 33: PETSC_EXTERN PetscErrorCode PetscTableIsEmpty(const PetscTable,PetscInt*);
 34: PETSC_EXTERN PetscErrorCode PetscTableAddExpand(PetscTable,PetscInt,PetscInt,InsertMode);
 35: PETSC_EXTERN PetscErrorCode PetscTableAddCountExpand(PetscTable,PetscInt);
 36: PETSC_EXTERN PetscErrorCode PetscTableGetHeadPosition(PetscTable,PetscTablePosition*);
 37: PETSC_EXTERN PetscErrorCode PetscTableGetNext(PetscTable,PetscTablePosition*,PetscInt*,PetscInt*);
 38: PETSC_EXTERN PetscErrorCode PetscTableRemoveAll(PetscTable);

 40: PETSC_STATIC_INLINE PetscErrorCode PetscTableAdd(PetscTable ta,PetscInt key,PetscInt data,InsertMode imode)
 41: {
 43:   PetscInt       i,hash = (PetscInt)PetscHash(ta,(unsigned long)key);
 44:   PetscInt       hashstep = (PetscInt)PetscHashStep(ta,(unsigned long)key);

 47:   if (key <= 0) SETERRQ(PETSC_COMM_SELF,PETSC_ERR_ARG_OUTOFRANGE,"key <= 0");
 48:   if (key > ta->maxkey) SETERRQ2(PETSC_COMM_SELF,PETSC_ERR_ARG_OUTOFRANGE,"key %D is greater than largest key allowed %D",key,ta->maxkey);
 49:   if (!data) SETERRQ(PETSC_COMM_SELF,PETSC_ERR_ARG_OUTOFRANGE,"Null data");

 51:   for (i=0; i<ta->tablesize; i++) {
 52:     if (ta->keytable[hash] == key) {
 53:       switch (imode) {
 54:       case INSERT_VALUES:
 55:         ta->table[hash] = data; /* over write */
 56:         break;
 57:       case ADD_VALUES:
 58:         ta->table[hash] += data;
 59:         break;
 60:       case MAX_VALUES:
 61:         ta->table[hash] = PetscMax(ta->table[hash],data);
 62:         break;
 63:       case NOT_SET_VALUES:
 64:       case INSERT_ALL_VALUES:
 65:       case ADD_ALL_VALUES:
 66:       case INSERT_BC_VALUES:
 67:       case ADD_BC_VALUES:
 68:         SETERRQ(PETSC_COMM_SELF,PETSC_ERR_SUP,"Unsupported InsertMode");
 69:       }
 70:       return(0);
 71:     } else if (!ta->keytable[hash]) {
 72:       if (ta->count < 5*(ta->tablesize/6) - 1) {
 73:         ta->count++; /* add */
 74:         ta->keytable[hash] = key;
 75:         ta->table[hash] = data;
 76:       } else {
 77:         PetscTableAddExpand(ta,key,data,imode);
 78:       }
 79:       return(0);
 80:     }
 81:     hash = (hash + hashstep)%ta->tablesize;
 82:   }
 83:   SETERRQ(PETSC_COMM_SELF,PETSC_ERR_COR,"Full table");
 84:   /* return(0); */
 85: }

 87: PETSC_STATIC_INLINE PetscErrorCode  PetscTableAddCount(PetscTable ta,PetscInt key)
 88: {
 90:   PetscInt       i,hash = (PetscInt)PetscHash(ta,(unsigned long)key);
 91:   PetscInt       hashstep = (PetscInt)PetscHashStep(ta,(unsigned long)key);

 94:   if (key <= 0) SETERRQ(PETSC_COMM_SELF,PETSC_ERR_ARG_OUTOFRANGE,"key <= 0");
 95:   if (key > ta->maxkey) SETERRQ2(PETSC_COMM_SELF,PETSC_ERR_ARG_OUTOFRANGE,"key %D is greater than largest key allowed %D",key,ta->maxkey);

 97:   for (i=0; i<ta->tablesize; i++) {
 98:     if (ta->keytable[hash] == key) {
 99:       return(0);
100:     } else if (!ta->keytable[hash]) {
101:       if (ta->count < 5*(ta->tablesize/6) - 1) {
102:         ta->count++; /* add */
103:         ta->keytable[hash] = key;
104:         ta->table[hash] = ta->count;
105:       } else {
106:         PetscTableAddCountExpand(ta,key);
107:       }
108:       return(0);
109:     }
110:     hash = (hash + hashstep)%ta->tablesize;
111:   }
112:   SETERRQ(PETSC_COMM_SELF,PETSC_ERR_COR,"Full table");
113:   /* return(0); */
114: }

116: /*
117:     PetscTableFind - checks if a key is in the table

119:     If data==0, then no table entry exists.

121: */
122: PETSC_STATIC_INLINE PetscErrorCode  PetscTableFind(PetscTable ta,PetscInt key,PetscInt *data)
123: {
124:   PetscInt       ii = 0;
125:   PetscInt       hash = (PetscInt)PetscHash(ta,(unsigned long)key);
126:   PetscInt       hashstep = (PetscInt)PetscHashStep(ta,(unsigned long)key);

129:   *data = 0;
130:   if (key <= 0) SETERRQ(PETSC_COMM_SELF,PETSC_ERR_ARG_OUTOFRANGE,"Key <= 0");
131:   if (key > ta->maxkey) SETERRQ2(PETSC_COMM_SELF,PETSC_ERR_ARG_OUTOFRANGE,"key %D is greater than largest key allowed %D",key,ta->maxkey);

133:   while (ii++ < ta->tablesize) {
134:     if (!ta->keytable[hash]) break;
135:     else if (ta->keytable[hash] == key) {
136:       *data = ta->table[hash];
137:       break;
138:     }
139:     hash = (hash + hashstep)%ta->tablesize;
140:   }
141:   return(0);
142: }

144: #endif