84 lines
1.8 KiB
C
84 lines
1.8 KiB
C
#include "sigar.h"
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#include "sigar_private.h"
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#include "sigar_util.h"
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/*
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* hash table to cache values where key is a unique number
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* such as:
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* pid -> some process data
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* uid -> user name
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* gid -> group name
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*/
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#define ENTRIES_SIZE(n) \
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(sizeof(sigar_cache_entry_t *) * (n))
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sigar_cache_t *sigar_cache_new(int size)
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{
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sigar_cache_t *table = malloc(sizeof(*table));
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table->count = 0;
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table->size = size;
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table->entries = malloc(ENTRIES_SIZE(size));
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memset(table->entries, '\0', ENTRIES_SIZE(size));
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table->free_value = free;
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return table;
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}
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sigar_cache_entry_t *sigar_cache_get(sigar_cache_t *table,
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sigar_uint64_t key)
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{
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sigar_cache_entry_t *entry, **ptr;
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for (ptr = table->entries + (key % table->size), entry = *ptr;
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entry; ptr = &entry->next, entry = *ptr)
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{
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if (entry->id == key) {
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return entry;
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}
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}
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if (table->count++ > table->size) {
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unsigned int new_size = table->size * 2;
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table->entries =
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realloc(table->entries, ENTRIES_SIZE(new_size));
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memset(table->entries + table->size, '\0',
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ENTRIES_SIZE(new_size - table->size));
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table->size = new_size;
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}
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*ptr = entry = malloc(sizeof(*entry));
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entry->id = key;
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entry->value = NULL;
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entry->next = NULL;
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return entry;
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}
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void sigar_cache_destroy(sigar_cache_t *table)
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{
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int i;
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sigar_cache_entry_t **entries = table->entries;
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for (i=0; i<table->size; i++) {
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sigar_cache_entry_t *entry, *ptr;
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entry = ptr = *entries++;
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if (!entry) {
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continue;
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}
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do {
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if (ptr->value) {
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table->free_value(ptr->value);
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}
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} while ((ptr = ptr->next));
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free(entry);
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}
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free(table->entries);
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free(table);
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}
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