68 lines
2.1 KiB
C
68 lines
2.1 KiB
C
#ifndef __CORE_INDEX_H__
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#define __CORE_INDEX_H__
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#include "core.h"
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#include "core_mutex.h"
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#define INVALID_INDEX 0
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#define index_declare(__name, __size) \
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typedef struct { \
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int head, tail; \
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int size, avail; \
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c_uint32_t free_index[__size]; \
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mutex_id mut; \
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} index_##__name##_t; \
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index_##__name##_t __name
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#define index_init(__pname, __size) do { \
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int __i; \
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mutex_create(&(__pname)->mut, MUTEX_DEFAULT); \
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(__pname)->size = (__pname)->avail = __size; \
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(__pname)->head = (__pname)->tail = 0; \
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for (__i = 0; __i < __size; __i++) \
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(__pname)->free_index[__i] = (__i + 1); \
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} while (0)
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#define index_final(__pname) \
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((__pname)->mut ? mutex_delete((__pname)->mut) : CORE_OK)
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#define index_init_wo_lock(__pname, __size) do { \
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int __i; \
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(__pname)->mut = 0; \
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(__pname)->size = (__pname)->avail = __size; \
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(__pname)->head = (__pname)->tail = 0; \
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for (__i = 0; __i < __size; __i++) \
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(__pname)->free_index[__i] = (__i + 1); \
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} while (0)
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#define index_alloc(__pname, __index) do { \
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(__index) = INVALID_INDEX; \
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if ((__pname)->mut) mutex_lock((__pname)->mut); \
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if ((__pname)->avail > 0) { \
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(__pname)->avail--; \
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(__index) = (__pname)->free_index[(__pname)->head]; \
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(__pname)->free_index[(__pname)->head] = INVALID_INDEX; \
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(__pname)->head = ((__pname)->head + 1) % ((__pname)->size); \
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} \
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if ((__pname)->mut) mutex_unlock((__pname)->mut); \
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} while (0)
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#define index_free(__pname, __index) do { \
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if ((__pname)->mut) mutex_lock((__pname)->mut); \
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if ((__pname)->avail < (__pname)->size) { \
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(__pname)->avail++; \
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(__pname)->free_index[(__pname)->tail] = (__index); \
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(__pname)->tail = ((__pname)->tail + 1) % ((__pname)->size); \
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} \
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if ((__pname)->mut) mutex_unlock((__pname)->mut); \
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} while (0)
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#define index_size(__pname) ((__pname)->size)
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#define index_avail(__pname) ((__pname)->avail)
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#define index_used(__pname) (index_size(__pname) - index_avail(__pname))
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#endif /* ! __CORE_INDEX_H__ */
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