This commit adds functionality to the mem-pool type that can be
generally useful. This functionality will be used in a future commit.
Signed-off-by: Jameson Miller <jam...@microsoft.com>
---
mem-pool.c | 58 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
mem-pool.h | 24 ++++++++++++++++++++++++
2 files changed, 82 insertions(+)
diff --git a/mem-pool.c b/mem-pool.c
index 992e354e12..7d21a7e035 100644
--- a/mem-pool.c
+++ b/mem-pool.c
@@ -5,6 +5,8 @@
#include "cache.h"
#include "mem-pool.h"
+#define MIN_ALLOC_GROWTH_SIZE 1024 * 1024
+
static struct mp_block *mem_pool_alloc_block(struct mem_pool *mem_pool)
{
struct mp_block *p;
@@ -59,6 +61,36 @@ static struct mp_block
*mem_pool_alloc_block_with_size(struct mem_pool *mem_pool
return p;
}
+void mem_pool_init(struct mem_pool **mem_pool, size_t block_alloc, size_t
initial_size)
+{
+ if (!(*mem_pool))
+ {
+ if (block_alloc < (MIN_ALLOC_GROWTH_SIZE - sizeof(struct
mp_block)))
+ block_alloc = (MIN_ALLOC_GROWTH_SIZE - sizeof(struct
mp_block));
+
+ *mem_pool = xmalloc(sizeof(struct mem_pool));
+ (*mem_pool)->pool_alloc = 0;
+ (*mem_pool)->mp_block = 0;
+ (*mem_pool)->block_alloc = block_alloc;
+
+ if (initial_size > 0)
+ mem_pool_alloc_block_with_size(*mem_pool, initial_size);
+ }
+}
+
+void mem_pool_discard(struct mem_pool *mem_pool)
+{
+ struct mp_block *block, *block_to_free;
+ for (block = mem_pool->mp_block; block;)
+ {
+ block_to_free = block;
+ block = block->next_block;
+ free(block_to_free);
+ }
+
+ free(mem_pool);
+}
+
void *mem_pool_alloc(struct mem_pool *mem_pool, size_t len)
{
struct mp_block *p;
@@ -101,3 +133,29 @@ void *mem_pool_calloc(struct mem_pool *mem_pool, size_t
count, size_t size)
memset(r, 0, len);
return r;
}
+
+int mem_pool_contains(struct mem_pool *mem_pool, void *mem)
+{
+ struct mp_block *p;
+ for (p = mem_pool->mp_block; p; p = p->next_block)
+ if ((mem >= ((void *)p->space)) &&
+ (mem < ((void *)p->end)))
+ return 1;
+
+ return 0;
+}
+
+void mem_pool_combine(struct mem_pool *dst, struct mem_pool *src)
+{
+ struct mp_block **tail = &dst->mp_block;
+ /* find pointer of dst's last block (if any) */
+ while (*tail)
+ tail = &(*tail)->next_block;
+
+ /* append the blocks from src to dst */
+ *tail = src->mp_block;
+
+ dst->pool_alloc += src->pool_alloc;
+ src->pool_alloc = 0;
+ src->mp_block = NULL;
+}
diff --git a/mem-pool.h b/mem-pool.h
index 829ad58ecf..d9e7f21541 100644
--- a/mem-pool.h
+++ b/mem-pool.h
@@ -21,6 +21,17 @@ struct mem_pool {
size_t pool_alloc;
};
+/*
+ * Initialize mem_pool with specified parameters for initial size and
+ * how much to grow when a larger memory block is required.
+ */
+void mem_pool_init(struct mem_pool **mem_pool, size_t alloc_growth_size,
size_t initial_size);
+
+/*
+ * Discard a memory pool and free all the memory it is responsible for.
+ */
+void mem_pool_discard(struct mem_pool *mem_pool);
+
/*
* Alloc memory from the mem_pool.
*/
@@ -31,4 +42,17 @@ void *mem_pool_alloc(struct mem_pool *pool, size_t len);
*/
void *mem_pool_calloc(struct mem_pool *pool, size_t count, size_t size);
+/*
+ * Move the memory associated with the 'src' pool to the 'dst' pool. The 'src'
+ * pool will be empty and not contain any memory. It still needs to be free'd
+ * with a call to `mem_pool_discard`.
+ */
+void mem_pool_combine(struct mem_pool *dst, struct mem_pool *src);
+
+/*
+ * Check if a memory pointed at by 'mem' is part of the range of
+ * memory managed by the specified mem_pool.
+ */
+int mem_pool_contains(struct mem_pool *mem_pool, void *mem);
+
#endif
--
2.14.3
