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Added locking to id pool allocation and free.

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This commit is contained in:
Bahadir Balban
2008-02-09 14:30:03 +00:00
parent ba0e3ada21
commit cc23568629
2 changed files with 20 additions and 4 deletions
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2
include/l4/lib/idpool.h
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@@ -2,8 +2,10 @@
#define __IDPOOL_H__
#include <l4/lib/bit.h>
#include <l4/lib/spinlock.h>
struct id_pool {
struct spinlock lock;
int nwords;
u32 bitmap[];
};

22
src/lib/idpool.c
View File

@@ -1,7 +1,7 @@
/*
* Used for thread and space ids.
*
* Copyright (C) 2007 Bahadir Balban
* Copyright (C) 2007, 2008 Bahadir Balban
*/
#include <l4/lib/printk.h>
#include <l4/lib/idpool.h>
@@ -13,21 +13,31 @@ struct id_pool *id_pool_new_init(int totalbits)
int nwords = BITWISE_GETWORD(totalbits);
struct id_pool *new = kzalloc((nwords * SZ_WORD)
+ sizeof(struct id_pool));
spin_lock_init(&new->lock);
new->nwords = nwords;
return new;
}
int id_new(struct id_pool *pool)
{
int id = find_and_set_first_free_bit(pool->bitmap,
int id;
spin_lock(&pool->lock);
id = find_and_set_first_free_bit(pool->bitmap,
pool->nwords * WORD_BITS);
spin_unlock(&pool->lock);
BUG_ON(id < 0);
return id;
}
int id_del(struct id_pool *pool, int id)
{
int ret = check_and_clear_bit(pool->bitmap, id);
int ret;
spin_lock(&pool->lock);
ret = check_and_clear_bit(pool->bitmap, id);
spin_unlock(&pool->lock);
BUG_ON(ret < 0);
return ret;
@@ -36,7 +46,11 @@ int id_del(struct id_pool *pool, int id)
/* Return a specific id, if available */
int id_get(struct id_pool *pool, int id)
{
int ret = check_and_set_bit(pool->bitmap, id);
int ret;
spin_lock(&pool->lock);
ret = check_and_set_bit(pool->bitmap, id);
spin_unlock(&pool->lock);
if (ret < 0)
return ret;