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frying my brain coming up with a decent compromise on arena usage...

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Edward R. Gonzalez
2025-02-05 15:46:58 -05:00
parent 268271e4a7
commit a41bd8a5f1
7 changed files with 231 additions and 230 deletions
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code/base/arena.h
+14 -19
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@@ -19,17 +19,19 @@
typedef U32 ArenaFlags;
enum
{
ArenaFlag_NoChain = ( 1 << 0),
ArenaFlag_LargePages = ( 1 << 1),
// Don't chain this arena
ArenaFlag_NoChain = (1 << 0),
// Only works if backing is virtual memory, will allocate a new backing VArena when the current block exhausts
// Otherwise will assume backing can chain multiple block_size arenas until failure.
ArenaFlag_ChainVirtual = (1 << 1),
};
typedef struct ArenaParams ArenaParams;
struct ArenaParams
{
ArenaFlags flags;
U64 reserve_size;
U64 commit_size;
void* optional_backing_buffer;
AllocatorInfo backing;
ArenaFlags flags;
U64 block_size; // If chaining VArenas set this to the reserve size
};
/* NOTE(Ed): This is a combination of several concepts into a single interface:
@@ -44,18 +46,14 @@ struct ArenaParams
typedef struct Arena Arena;
struct Arena
{
AllocatorInfo backing;
Arena* prev; // previous arena in chain
Arena* current; // current arena in chain
ArenaFlags flags;
U32 cmt_size;
U64 res_size;
U64 base_pos;
AllocatorInfo backing;
U64 pos;
U64 cmt;
U64 res;
U64 block_size;
ArenaFlags flags;
};
static_assert(sizeof(Arena) <= ARENA_HEADER_SIZE, "sizeof(Arena) <= MD_ARENA_HEADER_SIZE");
static_assert(size_of(Arena) <= ARENA_HEADER_SIZE, "sizeof(Arena) <= ARENA_HEADER_SIZE");
typedef struct TempArena TempArena;
struct TempArena
@@ -67,12 +65,12 @@ struct TempArena
////////////////////////////////
//~ rjf: Arena Functions
MD_API void* arena_allocator_proc(void* allocator_data, AllocType type, SSIZE size, SSIZE alignment, void* old_memory, SSIZE old_size, U64 flags);
MD_API void* arena_allocator_proc(void* allocator_data, AllocatorMode mode, SSIZE size, SSIZE alignment, void* old_memory, SSIZE old_size, U64 flags);
//- rjf: arena creation/destruction
MD_API Arena* arena_alloc_(ArenaParams *params);
#define arena_alloc(...) arena_alloc_( & ( ArenaParams) { .reserve_size = MB(64), .commit_size = KB(64), __VA_ARGS__ } )
#define arena_alloc(...) arena_alloc_( & ( ArenaParams) { .backing = {}, .reserve_size = MB(64), .commit_size = KB(64), __VA_ARGS__ } )
void arena_release(Arena *arena);
@@ -109,9 +107,6 @@ arena_release(Arena* arena)
for (Arena* n = arena->current, *prev = 0; n != 0; n = prev)
{
prev = n->prev;
// os_release(n, n->res);
alloc_free(arena->backing, n);
}
}