1: #ifndef PETSCCTABLE_H
  2: #define 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: {
 19:   return(x%(unsigned long)ta->tablesize);
 20: }

 22: PETSC_STATIC_INLINE unsigned long PetscHashStep(PetscTable ta,unsigned long x)
 23: {
 24:   return(1+(x%(unsigned long)(ta->tablesize-1)));
 25: }

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

 38: PETSC_STATIC_INLINE PetscErrorCode PetscTableAdd(PetscTable ta,PetscInt key,PetscInt data,InsertMode imode)
 39: {
 41:   PetscInt       i,hash = (PetscInt)PetscHash(ta,(unsigned long)key);
 42:   PetscInt       hashstep = (PetscInt)PetscHashStep(ta,(unsigned long)key);

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

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

 85: PETSC_STATIC_INLINE PetscErrorCode  PetscTableAddCount(PetscTable ta,PetscInt key)
 86: {
 88:   PetscInt       i,hash = (PetscInt)PetscHash(ta,(unsigned long)key);
 89:   PetscInt       hashstep = (PetscInt)PetscHashStep(ta,(unsigned long)key);

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

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

114: /*
115:     PetscTableFind - checks if a key is in the table

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

119: */
120: PETSC_STATIC_INLINE PetscErrorCode  PetscTableFind(PetscTable ta,PetscInt key,PetscInt *data)
121: {
122:   PetscInt       ii = 0;
123:   PetscInt       hash = (PetscInt)PetscHash(ta,(unsigned long)key);
124:   PetscInt       hashstep = (PetscInt)PetscHashStep(ta,(unsigned long)key);

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

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

142: #endif