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pointer_hash.c
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pointer_hash.c
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/*
* Copyright (c) 2020, Circonus, Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials provided
* with the distribution.
* * Neither the name Circonus, Inc. nor the names of its contributors
* may be used to endorse or promote products derived from this
* software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <stdlib.h>
#include <pthread.h>
#include "util/pointer_hash.h"
static bool initialized = false;
static ck_ht_t pointer_hash;
static pthread_mutex_t ht_mutex = PTHREAD_MUTEX_INITIALIZER;
void *pointer_hash_malloc(size_t s) {
return malloc(s);
}
void *pointer_hash_realloc(void *p, size_t s_old, size_t s_new, bool d) {
return realloc(p, s_new);
}
void pointer_hash_free(void *p, size_t s, bool d) {
free(p);
return;
}
struct ck_malloc pointer_hash_allocator = {
.malloc = pointer_hash_malloc,
.realloc = pointer_hash_realloc,
.free = pointer_hash_free
};
void pointer_hash_function(ck_ht_hash_t *object, const void *key, size_t key_len, uint64_t seed) {
*(uint64_t *)object = (uint64_t)(*(unsigned long *)(key) >> 3);
}
bool pointer_hash_init() {
if (initialized) { return true; }
initialized = true;
return ck_ht_init(&pointer_hash, CK_HT_MODE_DIRECT | CK_HT_WORKLOAD_DELETE, pointer_hash_function,
&pointer_hash_allocator, 50, 23498279);
}
bool pointer_hash_insert(const void *key, const uint64_t value) {
if (!initialized) { pointer_hash_init(); }
uint64_t *val_ptr = (uint64_t *)malloc(sizeof(uint64_t));
*val_ptr = value;
ck_ht_hash_t hash_value;
ck_ht_hash_direct(&hash_value, &pointer_hash, (uintptr_t)key);
struct ck_ht_entry entry;
ck_ht_entry_set_direct(&entry, hash_value, (uintptr_t)key, (uintptr_t)val_ptr);
// ck_ht is SPMC, so needs lock on writing
pthread_mutex_lock(&ht_mutex);
bool result = ck_ht_put_spmc(&pointer_hash, hash_value, &entry);
// this shouldn't happen but we want to try to recover, but still return false
if (!result) {
ck_ht_set_spmc(&pointer_hash, hash_value, &entry);
}
pthread_mutex_unlock(&ht_mutex);
return result;
}
uint64_t *pointer_hash_get(const void *key) {
if (!initialized) { pointer_hash_init(); }
ck_ht_hash_t hash_value;
ck_ht_hash_direct(&hash_value, &pointer_hash, (uintptr_t)key);
struct ck_ht_entry entry;
ck_ht_entry_key_set_direct(&entry, (uintptr_t)key);
if (!ck_ht_get_spmc(&pointer_hash, hash_value, &entry)) {
return NULL;
}
return (uint64_t *)ck_ht_entry_value_direct(&entry);
}
bool pointer_hash_remove(const void *key) {
ck_ht_hash_t hash_value;
ck_ht_hash_direct(&hash_value, &pointer_hash, (uintptr_t)key);
struct ck_ht_entry entry;
ck_ht_entry_key_set_direct(&entry, (uintptr_t)key);
// ck_ht is SPMC, so needs lock on writing
pthread_mutex_lock(&ht_mutex);
bool result = ck_ht_remove_spmc(&pointer_hash, hash_value, &entry);
pthread_mutex_unlock(&ht_mutex);
if (result == true) {
free((void *)ck_ht_entry_value_direct(&entry));
}
return result;
}
void pointer_hash_destroy() {
ck_ht_destroy(&pointer_hash);
}