117 lines
2.4 KiB
C
Executable File
117 lines
2.4 KiB
C
Executable File
/*
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* Copyright (c) 2006-2023, RT-Thread Development Team
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Change Logs:
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* Date Author Notes
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* 2023-12-07 Shell First version
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*/
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#include "rid_bitmap.h"
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#include <bitmap.h>
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#include <rtdef.h>
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void rid_bitmap_init(rid_bitmap_t mgr, int min_id, int total_id_count,
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rt_bitmap_t *set, struct rt_mutex *id_lock)
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{
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mgr->min_id = min_id;
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mgr->total_id_count = total_id_count;
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mgr->bitset = set;
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mgr->id_lock = id_lock;
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return;
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}
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long rid_bitmap_get(rid_bitmap_t mgr)
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{
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long id;
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long overflow;
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if (mgr->id_lock)
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{
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rt_mutex_take(mgr->id_lock, RT_WAITING_FOREVER);
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}
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overflow = mgr->total_id_count;
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id = rt_bitmap_next_clear_bit(mgr->bitset, 0, overflow);
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if (id == overflow)
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{
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id = -1;
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}
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else
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{
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rt_bitmap_set_bit(mgr->bitset, id);
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id += mgr->min_id;
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}
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if (mgr->id_lock)
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{
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rt_mutex_release(mgr->id_lock);
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}
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return id;
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}
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long rid_bitmap_get_named(rid_bitmap_t mgr, long no)
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{
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long id_relative;
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long overflow;
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long min;
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if (mgr->id_lock)
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{
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rt_mutex_take(mgr->id_lock, RT_WAITING_FOREVER);
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}
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min = mgr->min_id;
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id_relative = no - min;
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overflow = mgr->total_id_count;
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if (id_relative >= min && id_relative < overflow)
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{
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if (rt_bitmap_test_bit(mgr->bitset, id_relative))
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{
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id_relative = -RT_EBUSY;
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}
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else
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{
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rt_bitmap_set_bit(mgr->bitset, id_relative);
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id_relative += min;
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}
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}
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else
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{
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id_relative = -1;
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}
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if (mgr->id_lock)
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{
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rt_mutex_release(mgr->id_lock);
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}
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return id_relative;
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}
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void rid_bitmap_put(rid_bitmap_t mgr, long no)
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{
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long id_relative;
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long overflow;
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long min;
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if (mgr->id_lock)
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{
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rt_mutex_take(mgr->id_lock, RT_WAITING_FOREVER);
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}
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min = mgr->min_id;
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id_relative = no - min;
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overflow = mgr->total_id_count;
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if (id_relative >= min && id_relative < overflow &&
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rt_bitmap_test_bit(mgr->bitset, id_relative))
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{
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rt_bitmap_clear_bit(mgr->bitset, id_relative);
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}
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if (mgr->id_lock)
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{
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rt_mutex_release(mgr->id_lock);
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}
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}
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