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/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* Fluent Bit
* ==========
* Copyright (C) 2015-2022 The Fluent Bit Authors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <stdio.h>
#include <sys/types.h>
#include <fluent-bit/flb_time.h>
#include <fluent-bit/flb_mem.h>
#include <fluent-bit/flb_log.h>
#include <fluent-bit/flb_str.h>
#include "size_window.h"
#ifdef _WIN32
#include <windows.h>
#elif _M_X64
#include <windows.h>
#else
#include <pthread.h>
#endif
/*This function create a new size throttling window named @name with @size number of panes.
The total amount of entries is 0 with timestamp set according to the current system time.
The name of the window is null terminated. The length of the name @name_lenght is used
for optimization when you use strings longer than the name you want. Otherwise use strlen(@name)
when such thing is not needed.*/
struct throttle_size_window *size_window_create(const char *name,
unsigned name_length,
unsigned int size)
{
struct throttle_size_window *stw;
struct flb_time ftm;
int i;
if (size <= 0) {
return NULL;
}
stw = flb_malloc(sizeof(struct throttle_size_window));
if (!stw) {
flb_errno();
return NULL;
}
stw->size = size;
stw->total = 0;
stw->head = size - 1;
stw->tail = 0;
stw->table = flb_calloc(size, sizeof(struct throttle_size_pane));
if (!stw->table) {
flb_errno();
flb_free(stw);
return NULL;
}
stw->name = flb_strndup(name, name_length);
if (!stw->name) {
flb_errno();
flb_free(stw->table);
flb_free(stw);
return NULL;
}
flb_time_get(&ftm);
stw->timestamp = flb_time_to_double(&ftm);
for (i = 0; i < size; i++) {
stw->table[i].timestamp = stw->timestamp;
stw->table[i].size = 0;
}
flb_debug
("[filter_throttle_size] New size throttling window named \"%s\" was created.",
stw->name);
return stw;
}
static inline void *create_lock()
{
#ifdef _WIN32
HANDLE lock = CreateMutex(NULL, // default security attributes
FALSE, // initially not owned
NULL); // unnamed mutex
if (lock == NULL) {
flb_error("CreateMutex error: %d\n", GetLastError());
return NULL;
}
return lock;
#elif _M_X64
HANDLE lock = CreateMutex(NULL, // default security attributes
FALSE, // initially not owned
NULL); // unnamed mutex
if (lock == NULL) {
flb_error("CreateMutex error: %d\n", GetLastError());
return NULL;
}
return lock;
#else
pthread_mutex_t *lock = flb_malloc(sizeof(pthread_mutex_t));
if (!lock) {
return NULL;
}
if (pthread_mutex_init(lock, NULL) != 0) {
flb_errno();
return NULL;
}
return lock;
#endif
}
void lock_throttle_size_table(struct throttle_size_table *ht)
{
#ifdef _WIN32
DWORD dwWaitResult = WaitForSingleObject(ht->lock, // handle to mutex
INFINITE); // no time-out interval
if (WAIT_ABANDONED == dwWaitResult) {
flb_warn
("[filter_throttle_size]The thread got ownership of an abandoned mutex\nThe throttle_size_table is in an indeterminate state");
}
#elif _M_X64
DWORD dwWaitResult = WaitForSingleObject(ht->lock, // handle to mutex
INFINITE); // no time-out interval
if (WAIT_ABANDONED == dwWaitResult) {
flb_warn
("[filter_throttle_size]The thread got ownership of an abandoned mutex\nThe throttle_size_table is in an indeterminate state");
}
#else
pthread_mutex_lock(ht->lock);
#endif
}
void unlock_throttle_size_table(struct throttle_size_table *ht)
{
#ifdef _WIN32
if (!ReleaseMutex(ht->lock)) {
flb_warn
("[filter_throttle_size]Unable to release the ownership of throttle_size_table mutex!");
}
#elif _M_X64
if (!ReleaseMutex(ht->lock)) {
flb_warn
("[filter_throttle_size]Unable to release the ownership of throttle_size_table mutex!");
}
#else
pthread_mutex_unlock(ht->lock);
#endif
}
static inline void destroy_throttle_size_table_lock(struct throttle_size_table
*ht)
{
#ifdef _WIN32
CloseHandle(ht->lock);
#elif _M_X64
CloseHandle(ht->lock);
#else
pthread_mutex_destroy(ht->lock);
flb_free(ht->lock);
#endif
}
struct throttle_size_table *create_throttle_size_table(size_t size)
{
struct throttle_size_table *table;
table = flb_malloc(sizeof(struct throttle_size_table));
if (!table) {
return NULL;
}
table->windows =
flb_hash_table_create(FLB_HASH_TABLE_EVICT_NONE, size,
FLB_SIZE_WINDOW_HASH_MAX_ENTRIES);
if (!table->windows) {
flb_errno();
flb_free(table);
return NULL;
}
table->lock = create_lock();
if (!table->lock) {
flb_free(table);
return NULL;
}
return table;
}
void destroy_throttle_size_table(struct throttle_size_table *ht)
{
int i;
struct mk_list *tmp;
struct mk_list *head;
struct flb_hash_table_entry *entry;
struct flb_hash_table_chain *table;
for (i = 0; i < ht->windows->size; i++) {
table = &ht->windows->table[i];
mk_list_foreach_safe(head, tmp, &table->chains) {
entry = mk_list_entry(head, struct flb_hash_table_entry, _head);
free_stw_content((struct throttle_size_window *) entry->val);
mk_list_del(&entry->_head);
mk_list_del(&entry->_head_parent);
entry->table->count--;
ht->windows->total_count--;
flb_free(entry->key);
flb_free(entry->val);
flb_free(entry);
}
}
destroy_throttle_size_table_lock(ht);
flb_free(ht->windows->table);
flb_free(ht->windows);
flb_free(ht);
}
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