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/*
Copyright (c) 2012 Gluster, Inc. <http://www.gluster.com>
This file is part of GlusterFS.
GlusterFS is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published
by the Free Software Foundation; either version 3 of the License,
or (at your option) any later version.
GlusterFS is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see
<http://www.gnu.org/licenses/>.
*/
#include "circ-buff.h"
/* hold lock while calling this function */
int
__cb_add_entry_buffer (buffer_t *buffer, void *item)
{
circular_buffer_t *ptr = NULL;
int ret = -1;
//DO we really need the assert here?
GF_ASSERT (buffer->used_len <= buffer->size_buffer);
if (buffer->use_once == _gf_true &&
buffer->used_len == buffer->size_buffer) {
gf_log ("", GF_LOG_WARNING, "buffer %p is use once buffer",
buffer);
return -1;
} else {
if (buffer->used_len == buffer->size_buffer) {
if (buffer->cb[buffer->w_index]) {
ptr = buffer->cb[buffer->w_index];
if (ptr->data) {
GF_FREE (ptr->data);
ptr->data = NULL;
GF_FREE (ptr);
}
buffer->cb[buffer->w_index] = NULL;
ptr = NULL;
}
}
buffer->cb[buffer->w_index] =
GF_CALLOC (1, sizeof (circular_buffer_t),
gf_common_mt_circular_buffer_t);
if (!buffer->cb[buffer->w_index])
return -1;
buffer->cb[buffer->w_index]->data = item;
ret = gettimeofday (&buffer->cb[buffer->w_index]->tv, NULL);
if (ret == -1)
gf_log_callingfn ("", GF_LOG_WARNING, "getting time of"
"the day failed");
buffer->w_index++;
buffer->w_index %= buffer->size_buffer - 1;
//used_buffer size cannot be greater than the total buffer size
if (buffer->used_len < buffer->size_buffer)
buffer->used_len++;
return buffer->w_index;
}
}
int
cb_add_entry_buffer (buffer_t *buffer, void *item)
{
int write_index = -1;
pthread_mutex_lock (&buffer->lock);
{
write_index = __cb_add_entry_buffer (buffer, item);
}
pthread_mutex_unlock (&buffer->lock);
return write_index;
}
void
cb_buffer_show (buffer_t *buffer)
{
pthread_mutex_lock (&buffer->lock);
{
gf_log ("", GF_LOG_DEBUG, "w_index: %d, size: %"GF_PRI_SIZET
" used_buffer: %d", buffer->w_index,
buffer->size_buffer,
buffer->used_len);
}
pthread_mutex_unlock (&buffer->lock);
}
void
cb_buffer_dump (buffer_t *buffer, void *data,
int (fn) (circular_buffer_t *buffer, void *data))
{
int i = 0;
circular_buffer_t *entry = NULL;
int entries = 0;
pthread_mutex_lock (&buffer->lock);
{
if (buffer->use_once == _gf_false) {
for (i = (buffer->w_index - 1) ; entries <
buffer->used_len ; entries++) {
entry = buffer->cb[i];
if (entry)
fn (entry, data);
if (0 == i)
i = buffer->used_len - 1;
else
i = (i - 1) % (buffer->used_len - 1);
}
} else {
for (i = 0; i < buffer->used_len ; i++) {
entry = buffer->cb[i];
fn (entry, data);
}
}
}
pthread_mutex_unlock (&buffer->lock);
}
buffer_t *
cb_buffer_new (size_t buffer_size, gf_boolean_t use_once)
{
buffer_t *buffer = NULL;
buffer = GF_CALLOC (1, sizeof (*buffer), gf_common_mt_buffer_t);
if (!buffer) {
gf_log ("", GF_LOG_ERROR, "could not allocate the "
"buffer");
goto out;
}
buffer->cb = GF_CALLOC (buffer_size,
sizeof (circular_buffer_t *),
gf_common_mt_circular_buffer_t);
if (!buffer->cb) {
gf_log ("", GF_LOG_ERROR, "could not allocate the "
"memory for the circular buffer");
GF_FREE (buffer);
buffer = NULL;
goto out;
}
buffer->w_index = 0;
buffer->size_buffer = buffer_size;
buffer->use_once = use_once;
buffer->used_len = 0;
pthread_mutex_init (&buffer->lock, NULL);
out:
return buffer;
}
void
cb_buffer_destroy (buffer_t *buffer)
{
int i = 0;
if (buffer) {
if (buffer->cb) {
for (i = 0; i < buffer->used_len ; i++) {
if (buffer->cb[i])
GF_FREE (buffer->cb[i]);
}
GF_FREE (buffer->cb);
}
pthread_mutex_destroy (&buffer->lock);
GF_FREE (buffer);
}
}
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