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extend artifact cache with non-key-included generations, to allow gracefully decaying certain computations

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This commit is contained in:
Ryan Fleury
2025-09-22 15:25:01 -07:00
parent 811e58c249
commit 8a1e6ab2e6
4 changed files with 27 additions and 87 deletions
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src/artifact_cache/artifact_cache.c
+22 -6
View File
@@ -21,7 +21,7 @@ ac_init(void)
//~ rjf: Cache Lookups
internal void *
ac_artifact_from_key(Access *access, String8 key, AC_CreateFunctionType *create, AC_DestroyFunctionType *destroy, U64 slots_count)
ac_artifact_from_key(Access *access, String8 key, U64 gen, AC_CreateFunctionType *create, AC_DestroyFunctionType *destroy, U64 slots_count)
{
//- rjf: create function -> cache
AC_Cache *cache = 0;
@@ -69,8 +69,10 @@ ac_artifact_from_key(Access *access, String8 key, AC_CreateFunctionType *create,
for(B32 write_mode = 0; write_mode <= 1; write_mode += 1)
{
B32 found = 0;
B32 need_request = 0;
RWMutexScope(stripe->rw_mutex, write_mode)
{
// rjf: look up node
for(AC_Node *n = slot->first; n != 0; n = n->next)
{
if(str8_match(n->key, key, 0))
@@ -78,11 +80,19 @@ ac_artifact_from_key(Access *access, String8 key, AC_CreateFunctionType *create,
found = 1;
artifact = n->val;
access_touch(access, &n->access_pt, stripe->cv);
if(n->gen != gen)
{
B32 got_task = (ins_atomic_u64_eval_cond_assign(&n->working_count, 1, 0) == 0);
need_request = got_task;
}
break;
}
}
// rjf: no node? -> create
if(write_mode && !found)
{
need_request = 1;
AC_Node *node = stripe->free;
if(node)
{
@@ -99,11 +109,9 @@ ac_artifact_from_key(Access *access, String8 key, AC_CreateFunctionType *create,
node->working_count = 1;
}
}
if(found)
{
break;
}
else if(write_mode)
// rjf: need request -> push
if(need_request)
{
MutexScope(ac_shared->req_mutex)
{
@@ -111,10 +119,17 @@ ac_artifact_from_key(Access *access, String8 key, AC_CreateFunctionType *create,
SLLQueuePush(ac_shared->first_req, ac_shared->last_req, n);
ac_shared->req_count += 1;
n->v.key = str8_copy(ac_shared->req_arena, key);
n->v.gen = gen;
n->v.create = create;
}
cond_var_broadcast(async_tick_start_cond_var);
}
// rjf: found node -> break
if(found)
{
break;
}
}
}
@@ -240,6 +255,7 @@ ac_tick(void)
{
if(str8_match(n->key, reqs[idx].key, 0))
{
n->gen = reqs[idx].gen;
n->val = val;
ins_atomic_u64_dec_eval(&n->working_count);
}
src/artifact_cache/artifact_cache.h
+4 -2
View File
@@ -17,6 +17,7 @@ typedef struct AC_Request AC_Request;
struct AC_Request
{
String8 key;
U64 gen;
AC_CreateFunctionType *create;
};
@@ -33,8 +34,9 @@ struct AC_Node
AC_Node *next;
AC_Node *prev;
// rjf: key/value
// rjf: key/gen/value
String8 key;
U64 gen;
void *val;
// rjf: metadata
@@ -94,7 +96,7 @@ internal void ac_init(void);
////////////////////////////////
//~ rjf: Cache Lookups
internal void *ac_artifact_from_key(Access *access, String8 key, AC_CreateFunctionType *create, AC_DestroyFunctionType *destroy, U64 slots_count);
internal void *ac_artifact_from_key(Access *access, String8 key, U64 gen, AC_CreateFunctionType *create, AC_DestroyFunctionType *destroy, U64 slots_count);
////////////////////////////////
//~ rjf: Tick