217 строки
5.4 KiB
C
217 строки
5.4 KiB
C
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/*
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* $HEADER$
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*/
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/**
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* Utility functions to manage fortran <-> c opaque object translation
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*/
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#include <stdlib.h>
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#include <assert.h>
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#include "lam/lfc/lam_pointer_array.h"
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#include "lam/util/output.h"
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/**
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* add a pointer to dynamic pointer table
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*
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* @param table Pointer to lam_pointer_array_t object (IN)
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* @param ptr Pointer to be added to table (IN)
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*
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* @return Array index where ptr is inserted
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*/
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int lam_pointer_array_add(lam_pointer_array_t *table, void *ptr)
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{
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void **p;
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int index, i;
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enum { TABLE_INIT = 1, TABLE_GROW = 2 };
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if (LAM_ENABLE_DEBUG) {
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lam_output(0,"lam_pointer_array_add: IN: "
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" table %p (size %ld, lowest free %ld, number free %ld)"
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" ptr = %p\n",
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table, table->size, table->lowest_free, table->number_free,
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ptr);
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}
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assert(table != NULL);
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THREAD_LOCK(&(table->lock));
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if (table->addr == NULL) {
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/*
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* first time
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*/
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if (LAM_ENABLE_DEBUG) {
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lam_output(0,"lam_pointer_array_add: INIT: table %p\n", table);
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}
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p = malloc(TABLE_INIT * sizeof(void *));
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if (p == NULL) {
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return -1;
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}
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table->lowest_free = 0;
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table->number_free = TABLE_INIT;
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table->size = TABLE_INIT;
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table->addr = p;
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for (i = 0; i < table->size; i++) {
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table->addr[i] = NULL;
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}
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} else if (table->number_free == 0) {
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/*
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* grow table
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*/
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if (LAM_ENABLE_DEBUG) {
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lam_output(0,"lam_pointer_array_add: GROW: table %p growing %d -> %d\n",
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table, table->size, table->size * TABLE_GROW);
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}
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p = realloc(table->addr, TABLE_GROW * table->size * sizeof(void *));
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if (p == NULL) {
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THREAD_UNLOCK(&(table->lock));
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return -1;
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}
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table->lowest_free = table->size;
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table->number_free = (TABLE_GROW - 1) * table->size;
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table->size *= TABLE_GROW;
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table->addr = p;
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for (i = table->lowest_free; i < table->size; i++) {
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table->addr[i] = NULL;
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}
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}
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assert(table->addr != NULL);
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assert(table->size > 0);
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assert(table->lowest_free >= 0);
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assert(table->lowest_free < table->size);
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assert(table->number_free > 0);
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assert(table->number_free <= table->size);
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/*
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* add pointer to table, and return the index
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*/
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index = table->lowest_free;
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assert(table->addr[index] == NULL);
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table->addr[index] = ptr;
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table->number_free--;
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if (table->number_free > 0) {
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for (i = table->lowest_free + 1; i < table->size; i++) {
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if (table->addr[i] == NULL) {
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table->lowest_free = i;
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break;
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}
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}
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}
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else {
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table->lowest_free = table->size;
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}
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if (LAM_ENABLE_DEBUG) {
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lam_output(0,"lam_pointer_array_add: OUT: "
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" table %p (size %ld, lowest free %ld, number free %ld)"
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" addr[%d] = %p\n",
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table, table->size, table->lowest_free, table->number_free,
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index, ptr);
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}
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THREAD_UNLOCK(&(table->lock));
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return index;
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}
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/**
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* free a slot in dynamic pointer table for reuse
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*
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*
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* @param table Pointer to lam_pointer_array_t object (IN)
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* @param ptr Pointer to be added to table (IN)
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*
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* @return Error code
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*/
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int lam_pointer_array_set_item(lam_pointer_array_t *table, size_t index,
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void * value)
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{
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assert(table != NULL);
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assert(table->addr != NULL);
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assert(index >= 0);
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assert(index < table->size);
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if (LAM_ENABLE_DEBUG) {
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lam_output(0,"lam_pointer_array_set_item: IN: "
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" table %p (size %ld, lowest free %ld, number free %ld)"
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" addr[%d] = %p\n",
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table, table->size, table->lowest_free, table->number_free,
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index, table->addr[index]);
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}
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THREAD_LOCK(&(table->lock));
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table->addr[index] = value;
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if (index < table->lowest_free) {
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table->lowest_free = index;
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}
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table->number_free++;
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if (LAM_ENABLE_DEBUG) {
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lam_output(0,"lam_pointer_array_set_item: OUT: "
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" table %p (size %ld, lowest free %ld, number free %ld)"
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" addr[%d] = %p\n",
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table, table->size, table->lowest_free, table->number_free,
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index, table->addr[index]);
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}
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THREAD_UNLOCK(&(table->lock));
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return 0;
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}
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/**
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* lookup pointer by index in pointer table
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*
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* @param table Pointer to lam_pointer_array_t object (IN)
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* @param ptr Pointer to be added to table (IN)
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*
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* @return Pointer
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*/
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void *lam_pointer_array_get_item(lam_pointer_array_t *table, int index)
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{
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void *p;
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if (LAM_ENABLE_DEBUG) {
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lam_output(0,"lam_pointer_array_get_item: IN: "
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" table %p (size %ld, lowest free %ld, number free %ld)"
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" addr[%d] = %p\n",
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table, table->size, table->lowest_free, table->number_free,
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index, table->addr[index]);
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}
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THREAD_LOCK(&(table->lock));
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assert(table != NULL);
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assert(table->addr != NULL);
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assert(index >= 0);
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assert(index < table->size);
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p = table->addr[index];
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THREAD_UNLOCK(&(table->lock));
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if (LAM_ENABLE_DEBUG) {
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lam_output(0,"lam_pointer_array_get_item: OUT:"
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" table %p (size %ld, lowest free %ld, number free %ld)"
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" addr[%d] = %p\n",
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table, table->size, table->lowest_free, table->number_free,
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index, table->addr[index]);
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}
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return p;
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}
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