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Merge pull request #6535 from mruby/add-mempool-comments

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This commit is contained in:
Yukihiro "Matz" Matsumoto
2025-05-29 10:06:32 +09:00
committed by GitHub
parent 70614ba82a e0d1f99744
commit 0011ee2267
1 changed files with 51 additions and 6 deletions
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src/mempool.c
+51 -6
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@@ -31,20 +31,26 @@
#pragma warning(disable : 4200)
#endif
/*
** Represents a page in the memory pool.
*/
struct mempool_page {
struct mempool_page *next;
size_t offset;
size_t len;
void *last;
char page[];
struct mempool_page *next; /* Pointer to the next page in the pool. */
size_t offset; /* Current offset in the page for allocations. */
size_t len; /* Total length of the page. */
void *last; /* Pointer to the last allocation made from this page. */
char page[]; /* Flexible array member for the actual page data. */
};
#ifdef _MSC_VER
#pragma warning(pop)
#endif
/*
** Represents a memory pool.
*/
struct mempool {
struct mempool_page *pages;
struct mempool_page *pages; /* Pointer to the first page in the pool. */
};
#ifndef TEST_POOL
@@ -55,12 +61,23 @@ struct mempool {
#endif
/*
** Calculates the padding needed to align a memory address.
**
** @param x The memory address/size to align.
** @return The padding needed.
*/
#ifdef POOL_ALIGNMENT
# define ALIGN_PADDING(x) ((SIZE_MAX - (x) + 1) & (POOL_ALIGNMENT - 1))
#else
# define ALIGN_PADDING(x) (0)
#endif
/*
** Creates a new memory pool.
**
** @return A pointer to the new memory pool, or NULL if allocation fails.
*/
MRB_API mempool*
mempool_open(void)
{
@@ -72,6 +89,11 @@ mempool_open(void)
return pool;
}
/*
** Closes a memory pool and frees all associated memory.
**
** @param pool A pointer to the memory pool to close.
*/
MRB_API void
mempool_close(mempool *pool)
{
@@ -87,6 +109,13 @@ mempool_close(mempool *pool)
free(pool);
}
/*
** Allocates a new page for the memory pool.
**
** @param pool A pointer to the memory pool.
** @param len The minimum size of the page.
** @return A pointer to the new page, or NULL if allocation fails.
*/
static struct mempool_page*
page_alloc(mempool *pool, size_t len)
{
@@ -102,6 +131,13 @@ page_alloc(mempool *pool, size_t len)
return page;
}
/*
** Allocates memory from the memory pool.
**
** @param pool A pointer to the memory pool.
** @param len The size of memory to allocate.
** @return A pointer to the allocated memory, or NULL if allocation fails.
*/
MRB_API void*
mempool_alloc(mempool *pool, size_t len)
{
@@ -127,6 +163,15 @@ mempool_alloc(mempool *pool, size_t len)
return page->last;
}
/*
** Reallocates memory from the memory pool.
**
** @param pool A pointer to the memory pool.
** @param p A pointer to the previously allocated memory.
** @param oldlen The old size of the memory.
** @param newlen The new size of the memory.
** @return A pointer to the reallocated memory, or NULL if reallocation fails.
*/
MRB_API void*
mempool_realloc(mempool *pool, void *p, size_t oldlen, size_t newlen)
{