72 lines
2.3 KiB
C
72 lines
2.3 KiB
C
/*
|
|
* Licensed to the OpenAirInterface (OAI) Software Alliance under one or more
|
|
* contributor license agreements. See the NOTICE file distributed with
|
|
* this work for additional information regarding copyright ownership.
|
|
* The OpenAirInterface Software Alliance licenses this file to You under
|
|
* the OAI Public License, Version 1.1 (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.openairinterface.org/?page_id=698
|
|
*
|
|
* 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.
|
|
*-------------------------------------------------------------------------------
|
|
* For more information about the OpenAirInterface (OAI) Software Alliance:
|
|
* contact@openairinterface.org
|
|
*/
|
|
|
|
#ifndef LINEAR_ALLOC_H
|
|
#define LINEAR_ALLOC_H
|
|
|
|
#include <limits.h>
|
|
|
|
typedef unsigned int uid_t;
|
|
#define UID_LINEAR_ALLOCATOR_SIZE 1024
|
|
#define UID_LINEAR_ALLOCATOR_BITMAP_SIZE (((UID_LINEAR_ALLOCATOR_SIZE/8)/sizeof(unsigned int)) + 1)
|
|
typedef struct uid_linear_allocator_s {
|
|
unsigned int bitmap[UID_LINEAR_ALLOCATOR_BITMAP_SIZE];
|
|
} uid_allocator_t;
|
|
|
|
static inline void uid_linear_allocator_init(uid_allocator_t *uia) {
|
|
memset(uia, 0, sizeof(uid_allocator_t));
|
|
}
|
|
|
|
static inline uid_t uid_linear_allocator_new(uid_allocator_t *uia) {
|
|
unsigned int bit_index = 1;
|
|
uid_t uid = 0;
|
|
|
|
for (unsigned int i = 0; i < UID_LINEAR_ALLOCATOR_BITMAP_SIZE; i++) {
|
|
if (uia->bitmap[i] != UINT_MAX) {
|
|
bit_index = 1;
|
|
uid = 0;
|
|
|
|
while ((uia->bitmap[i] & bit_index) == bit_index) {
|
|
bit_index = bit_index << 1;
|
|
uid += 1;
|
|
}
|
|
|
|
uia->bitmap[i] |= bit_index;
|
|
return uid + (i*sizeof(unsigned int)*8);
|
|
}
|
|
}
|
|
|
|
return UINT_MAX;
|
|
}
|
|
|
|
|
|
static inline void uid_linear_allocator_free(uid_allocator_t *uia, uid_t uid) {
|
|
const unsigned int i = uid/sizeof(unsigned int)/8;
|
|
const unsigned int bit = uid % (sizeof(unsigned int) * 8);
|
|
const unsigned int value = ~(1 << bit);
|
|
|
|
if (i < UID_LINEAR_ALLOCATOR_BITMAP_SIZE) {
|
|
uia->bitmap[i] &= value;
|
|
}
|
|
}
|
|
|
|
#endif /* LINEAR_ALLOC_H */
|