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/*
* Copyright (C) 2016 Andrea Mazzoleni
*
* This program 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.
*
* This program 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/>.
*/
#ifndef __BW_H
#define __BW_H
#include "state.h"
#include "support.h"
/**
* Bandwidth limiting
*/
struct snapraid_bw {
uint64_t limit; /**< Bandwidth limit in bytes per second */
uint64_t total; /**< Remaining bytes allowed in current second */
uint64_t start; /**< Time when to reset the bandwidth counter */
};
/**
* Initialize the bandwidth limit
*/
void bw_init(struct snapraid_bw* bw, uint64_t limit);
/**
* Limit IO bandwidth to stay within the configured limit.
* If no limit is set, returns immediately.
* Otherwise sleeps as needed to maintain the rate limit.
*/
void bw_limit(struct snapraid_bw* bw, uint64_t bytes);
#endif
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