Multithread min dep set by removing the set itself

13 files changed, 263 insertions, 123 deletions

diff --git a/src/checker.cpp b/src/checker.cpp
index 26430359c..b3a702cbd 100644
--- a/src/checker.cpp
+++ b/src/checker.cpp
@@ -1712,7 +1712,7 @@ gb_internal void check_remove_expr_info(CheckerContext *c, Ast *e) {
 }
 
 gb_internal isize type_info_index(CheckerInfo *info, TypeInfoPair pair, bool error_on_failure) {
-	mutex_lock(&info->minimum_dependency_type_info_mutex);
+	rw_mutex_shared_lock(&info->minimum_dependency_type_info_mutex);
 
 	isize entry_index = -1;
 	u64 hash = pair.hash;
@@ -1720,7 +1720,7 @@ gb_internal isize type_info_index(CheckerInfo *info, TypeInfoPair pair, bool err
 	if (found_entry_index) {
 		entry_index = *found_entry_index;
 	}
-	mutex_unlock(&info->minimum_dependency_type_info_mutex);
+	rw_mutex_shared_unlock(&info->minimum_dependency_type_info_mutex);
 
 	if (error_on_failure && entry_index < 0) {
 		compiler_error("Type_Info for '%s' could not be found", type_to_string(pair.type));
@@ -2377,11 +2377,8 @@ gb_internal void add_min_dep_type_info(Checker *c, Type *t) {
 		return;
 	}
 
-	{
-		MUTEX_GUARD(&c->info.minimum_dependency_type_info_mutex);
-		if (type_set_update(&c->info.min_dep_type_info_set, t)) {
-			return;
-		}
+	if (type_set_update_with_mutex(&c->info.min_dep_type_info_set, t, &c->info.min_dep_type_info_set_mutex)) {
+		return;
 	}
 
 	// Add nested types
@@ -2555,13 +2552,15 @@ gb_internal void add_min_dep_type_info(Checker *c, Type *t) {
 	}
 }
 
+gb_internal void add_dependency_to_set_threaded(Checker *c, Entity *entity);
+
+gb_global std::atomic<Checker *> global_checker_ptr;
+
 gb_internal void add_dependency_to_set(Checker *c, Entity *entity) {
 	if (entity == nullptr) {
 		return;
 	}
 
-	CheckerInfo *info = &c->info;
-
 	if (entity->type != nullptr &&
 	    is_type_polymorphic(entity->type)) {
 		DeclInfo *decl = decl_info_of_entity(entity);
@@ -2570,11 +2569,8 @@ gb_internal void add_dependency_to_set(Checker *c, Entity *entity) {
 		}
 	}
 
-	{
-		MUTEX_GUARD(&info->minimum_dependency_type_info_mutex);
-		if (ptr_set_update(&info->minimum_dependency_set, entity)) {
-			return;
-		}
+	if (entity->min_dep_count.fetch_add(1, std::memory_order_relaxed) > 0) {
+		return;
 	}
 
 	DeclInfo *decl = decl_info_of_entity(entity);
@@ -2584,46 +2580,45 @@ gb_internal void add_dependency_to_set(Checker *c, Entity *entity) {
 	for (TypeInfoPair const tt : decl->type_info_deps) {
 		add_min_dep_type_info(c, tt.type);
 	}
-
 	for (Entity *e : decl->deps) {
-		add_dependency_to_set(c, e);
-		if (e->kind == Entity_Procedure && e->Procedure.is_foreign) {
-			Entity *fl = e->Procedure.foreign_library;
-			if (fl != nullptr) {
-				GB_ASSERT_MSG(fl->kind == Entity_LibraryName &&
-				              (fl->flags&EntityFlag_Used),
-				              "%.*s", LIT(entity->token.string));
-				add_dependency_to_set(c, fl);
+		switch (e->kind) {
+		case Entity_Procedure:
+			if (e->Procedure.is_foreign) {
+				Entity *fl = e->Procedure.foreign_library;
+				if (fl != nullptr) {
+					GB_ASSERT_MSG(fl->kind == Entity_LibraryName &&
+					              (fl->flags&EntityFlag_Used),
+					              "%.*s", LIT(entity->token.string));
+					add_dependency_to_set(c, fl);
+				}
 			}
-		} else if (e->kind == Entity_Variable && e->Variable.is_foreign) {
-			Entity *fl = e->Variable.foreign_library;
-			if (fl != nullptr) {
-				GB_ASSERT_MSG(fl->kind == Entity_LibraryName &&
-				              (fl->flags&EntityFlag_Used),
-				              "%.*s", LIT(entity->token.string));
-				add_dependency_to_set(c, fl);
+			break;
+		case Entity_Variable:
+			if (e->Variable.is_foreign) {
+				Entity *fl = e->Variable.foreign_library;
+				if (fl != nullptr) {
+					GB_ASSERT_MSG(fl->kind == Entity_LibraryName &&
+					              (fl->flags&EntityFlag_Used),
+					              "%.*s", LIT(entity->token.string));
+					add_dependency_to_set(c, fl);
+				}
 			}
+			break;
 		}
 	}
-}
 
-struct AddDependecyToSetWorkerData {
-	Checker *c;
-	Entity *entity;
-};
-
-gb_internal void add_dependency_to_set_threaded(Checker *c, Entity *entity);
+	for (Entity *e : decl->deps) {
+		add_dependency_to_set(c, e);
+	}
 
+}
 gb_internal WORKER_TASK_PROC(add_dependency_to_set_worker) {
-	AddDependecyToSetWorkerData *wd = cast(AddDependecyToSetWorkerData *)data;
-	Checker *c = wd->c;
-	Entity *entity = wd->entity;
+	Checker *c = global_checker_ptr.load(std::memory_order_relaxed);
+	Entity *entity = cast(Entity *)data;
 	if (entity == nullptr) {
 		return 0;
 	}
 
-	CheckerInfo *info = &c->info;
-
 	if (entity->type != nullptr &&
 	    is_type_polymorphic(entity->type)) {
 		DeclInfo *decl = decl_info_of_entity(entity);
@@ -2632,11 +2627,8 @@ gb_internal WORKER_TASK_PROC(add_dependency_to_set_worker) {
 		}
 	}
 
-	{
-		MUTEX_GUARD(&info->minimum_dependency_type_info_mutex);
-		if (ptr_set_update(&info->minimum_dependency_set, entity)) {
-			return 0;
-		}
+	if (entity->min_dep_count.fetch_add(1, std::memory_order_relaxed) > 0) {
+		return 0;
 	}
 
 	DeclInfo *decl = decl_info_of_entity(entity);
@@ -2648,25 +2640,36 @@ gb_internal WORKER_TASK_PROC(add_dependency_to_set_worker) {
 	}
 
 	for (Entity *e : decl->deps) {
-		add_dependency_to_set(c, e);
-		if (e->kind == Entity_Procedure && e->Procedure.is_foreign) {
-			Entity *fl = e->Procedure.foreign_library;
-			if (fl != nullptr) {
-				GB_ASSERT_MSG(fl->kind == Entity_LibraryName &&
-				              (fl->flags&EntityFlag_Used),
-				              "%.*s", LIT(entity->token.string));
-				add_dependency_to_set_threaded(c, fl);
+		switch (e->kind) {
+		case Entity_Procedure:
+			if (e->Procedure.is_foreign) {
+				Entity *fl = e->Procedure.foreign_library;
+				if (fl != nullptr) {
+					GB_ASSERT_MSG(fl->kind == Entity_LibraryName &&
+					              (fl->flags&EntityFlag_Used),
+					              "%.*s", LIT(entity->token.string));
+					add_dependency_to_set_threaded(c, fl);
+				}
 			}
-		} else if (e->kind == Entity_Variable && e->Variable.is_foreign) {
-			Entity *fl = e->Variable.foreign_library;
-			if (fl != nullptr) {
-				GB_ASSERT_MSG(fl->kind == Entity_LibraryName &&
-				              (fl->flags&EntityFlag_Used),
-				              "%.*s", LIT(entity->token.string));
-				add_dependency_to_set_threaded(c, fl);
+			break;
+		case Entity_Variable:
+			if (e->Variable.is_foreign) {
+				Entity *fl = e->Variable.foreign_library;
+				if (fl != nullptr) {
+					GB_ASSERT_MSG(fl->kind == Entity_LibraryName &&
+					              (fl->flags&EntityFlag_Used),
+					              "%.*s", LIT(entity->token.string));
+					add_dependency_to_set_threaded(c, fl);
+				}
 			}
+			break;
 		}
 	}
+
+	for (Entity *e : decl->deps) {
+		add_dependency_to_set_threaded(c, e);
+	}
+
 	return 0;
 }
 
@@ -2675,11 +2678,7 @@ gb_internal void add_dependency_to_set_threaded(Checker *c, Entity *entity) {
 	if (entity == nullptr) {
 		return;
 	}
-
-	AddDependecyToSetWorkerData *wd = gb_alloc_item(temporary_allocator(), AddDependecyToSetWorkerData);
-	wd->c = c;
-	wd->entity = entity;
-	thread_pool_add_task(add_dependency_to_set_worker, wd);
+	thread_pool_add_task(add_dependency_to_set_worker, entity);
 }
 
 
@@ -2732,27 +2731,35 @@ gb_internal void collect_testing_procedures_of_package(Checker *c, AstPackage *p
 }
 
 gb_internal void generate_minimum_dependency_set_internal(Checker *c, Entity *start) {
+	// auto const &add_to_set = add_dependency_to_set;
+	auto const &add_to_set = add_dependency_to_set_threaded;
+
+	Scope *builtin_scope = builtin_pkg->scope;
 	for_array(i, c->info.definitions) {
 		Entity *e = c->info.definitions[i];
-		if (e->scope == builtin_pkg->scope) {
+		if (e->scope == builtin_scope) {
 			if (e->type == nullptr) {
-				add_dependency_to_set_threaded(c, e);
+				add_to_set(c, e);
+			}
+		} else if (e->kind == Entity_Procedure) {
+			if (e->Procedure.is_export) {
+				add_to_set(c, e);
+			}
+		} else if (e->kind == Entity_Variable) {
+			if (e->Variable.is_export) {
+				add_to_set(c, e);
 			}
-		} else if (e->kind == Entity_Procedure && e->Procedure.is_export) {
-			add_dependency_to_set_threaded(c, e);
-		} else if (e->kind == Entity_Variable && e->Variable.is_export) {
-			add_dependency_to_set_threaded(c, e);
 		}
 	}
 
 	for (Entity *e; mpsc_dequeue(&c->info.required_foreign_imports_through_force_queue, &e); /**/) {
 		array_add(&c->info.required_foreign_imports_through_force, e);
-		add_dependency_to_set_threaded(c, e);
+		add_to_set(c, e);
 	}
 
 	for (Entity *e; mpsc_dequeue(&c->info.required_global_variable_queue, &e); /**/) {
 		e->flags |= EntityFlag_Used;
-		add_dependency_to_set_threaded(c, e);
+		add_to_set(c, e);
 	}
 
 	for_array(i, c->info.entities) {
@@ -2760,16 +2767,16 @@ gb_internal void generate_minimum_dependency_set_internal(Checker *c, Entity *st
 		switch (e->kind) {
 		case Entity_Variable:
 			if (e->Variable.is_export) {
-				add_dependency_to_set_threaded(c, e);
+				add_to_set(c, e);
 			} else if (e->flags & EntityFlag_Require) {
-				add_dependency_to_set_threaded(c, e);
+				add_to_set(c, e);
 			}
 			break;
 		case Entity_Procedure:
 			if (e->Procedure.is_export) {
-				add_dependency_to_set_threaded(c, e);
+				add_to_set(c, e);
 			} else if (e->flags & EntityFlag_Require) {
-				add_dependency_to_set_threaded(c, e);
+				add_to_set(c, e);
 			}
 			if (e->flags & EntityFlag_Init) {
 				Type *t = base_type(e->type);
@@ -2809,7 +2816,7 @@ gb_internal void generate_minimum_dependency_set_internal(Checker *c, Entity *st
 
 
 				if (is_init) {
-					add_dependency_to_set_threaded(c, e);
+					add_to_set(c, e);
 					array_add(&c->info.init_procedures, e);
 				}
 			} else if (e->flags & EntityFlag_Fini) {
@@ -2844,7 +2851,7 @@ gb_internal void generate_minimum_dependency_set_internal(Checker *c, Entity *st
 				}
 
 				if (is_fini) {
-					add_dependency_to_set_threaded(c, e);
+					add_to_set(c, e);
 					array_add(&c->info.fini_procedures, e);
 				}
 			}
@@ -2861,7 +2868,7 @@ gb_internal void generate_minimum_dependency_set_internal(Checker *c, Entity *st
 			Entity *e = entry.value;
 			if (e != nullptr) {
 				e->flags |= EntityFlag_Used;
-				add_dependency_to_set_threaded(c, e);
+				add_to_set(c, e);
 			}
 		}
 
@@ -2876,16 +2883,11 @@ gb_internal void generate_minimum_dependency_set_internal(Checker *c, Entity *st
 		}
 	} else if (start != nullptr) {
 		start->flags |= EntityFlag_Used;
-		add_dependency_to_set_threaded(c, start);
+		add_to_set(c, start);
 	}
 }
 
 gb_internal void generate_minimum_dependency_set(Checker *c, Entity *start) {
-	isize entity_count = c->info.entities.count;
-	isize min_dep_set_cap = next_pow2_isize(entity_count*4); // empirically determined factor
-
-	ptr_set_init(&c->info.minimum_dependency_set, min_dep_set_cap);
-
 #define FORCE_ADD_RUNTIME_ENTITIES(condition, ...) do {                                              \
 	if (condition) {                                                                             \
 		String entities[] = {__VA_ARGS__};                                                   \
@@ -6267,8 +6269,10 @@ gb_internal void check_unchecked_bodies(Checker *c) {
 	// use the `procs_to_check` array
 	global_procedure_body_in_worker_queue = false;
 
-	for (Entity *e : c->info.minimum_dependency_set) {
-		check_procedure_later_from_entity(c, e, "check_unchecked_bodies");
+	for (Entity *e : c->info.entities) {
+		if (e->min_dep_count.load(std::memory_order_relaxed) > 0) {
+			check_procedure_later_from_entity(c, e, "check_unchecked_bodies");
+		}
 	}
 
 	if (!global_procedure_body_in_worker_queue) {
@@ -7042,6 +7046,7 @@ gb_internal void check_merge_queues_into_arrays(Checker *c) {
 	}
 	check_add_entities_from_queues(c);
 	check_add_definitions_from_queues(c);
+	thread_pool_wait();
 }
 
 gb_internal GB_COMPARE_PROC(init_procedures_cmp) {
@@ -7100,7 +7105,7 @@ gb_internal void add_type_info_for_type_definitions(Checker *c) {
 		Entity *e = c->info.definitions[i];
 		if (e->kind == Entity_TypeName && e->type != nullptr && is_type_typed(e->type)) {
 			i64 align = type_align_of(e->type);
-			if (align > 0 && ptr_set_exists(&c->info.minimum_dependency_set, e)) {
+			if (align > 0 && e->min_dep_count.load(std::memory_order_relaxed) > 0) {
 				add_type_info_type(&c->builtin_ctx, e->type);
 			}
 		}
@@ -7170,6 +7175,8 @@ gb_internal void check_update_dependency_tree_for_procedures(Checker *c) {
 
 
 gb_internal void check_parsed_files(Checker *c) {
+	global_checker_ptr.store(c, std::memory_order_relaxed);
+
 	TIME_SECTION("map full filepaths to scope");
 	add_type_info_type(&c->builtin_ctx, t_invalid);
 
@@ -7312,11 +7319,9 @@ gb_internal void check_parsed_files(Checker *c) {
 	check_unchecked_bodies(c);
 
 	TIME_SECTION("check #soa types");
-
 	check_merge_queues_into_arrays(c);
-	thread_pool_wait();
 
-	TIME_SECTION("update minimum dependency set");
+	TIME_SECTION("update minimum dependency set again");
 	generate_minimum_dependency_set_internal(c, c->info.entry_point);
 
 	// NOTE(laytan): has to be ran after generate_minimum_dependency_set,
diff --git a/src/checker.hpp b/src/checker.hpp
index 1da46b74a..8b4d61ee2 100644
--- a/src/checker.hpp
+++ b/src/checker.hpp
@@ -449,11 +449,10 @@ struct CheckerInfo {
 	Scope *               init_scope;
 	Entity *              entry_point;
 
-	BlockingMutex         minimum_dependency_set_mutex;
-	PtrSet<Entity *>      minimum_dependency_set;
-
-	BlockingMutex minimum_dependency_type_info_mutex;
+	RwMutex minimum_dependency_type_info_mutex;
 	PtrMap</*type info hash*/u64, /*min dep index*/isize> min_dep_type_info_index_map;
+
+	RWSpinLock	    min_dep_type_info_set_mutex;
 	TypeSet             min_dep_type_info_set;
 	Array<TypeInfoPair> type_info_types_hash_map; // 2 * type_info_types.count
 
diff --git a/src/entity.cpp b/src/entity.cpp
index 6c0aa6ace..5ca3fa916 100644
--- a/src/entity.cpp
+++ b/src/entity.cpp
@@ -164,6 +164,7 @@ struct Entity {
 	u64         id;
 	std::atomic<u64>         flags;
 	std::atomic<EntityState> state;
+	std::atomic<i32>         min_dep_count;
 	Token       token;
 	Scope *     scope;
 	Type *      type;
diff --git a/src/error.cpp b/src/error.cpp
index 006d5ae8d..10bf1caf5 100644
--- a/src/error.cpp
+++ b/src/error.cpp
@@ -86,7 +86,7 @@ gb_internal char *token_pos_to_string(TokenPos const &pos);
 gb_internal bool set_file_path_string(i32 index, String const &path) {
 	bool ok = false;
 	GB_ASSERT(index >= 0);
-	mutex_lock(&global_error_collector.path_mutex);
+	// mutex_lock(&global_error_collector.path_mutex);
 	mutex_lock(&global_files_mutex);
 
 	if (index >= global_file_path_strings.count) {
@@ -99,14 +99,14 @@ gb_internal bool set_file_path_string(i32 index, String const &path) {
 	}
 
 	mutex_unlock(&global_files_mutex);
-	mutex_unlock(&global_error_collector.path_mutex);
+	// mutex_unlock(&global_error_collector.path_mutex);
 	return ok;
 }
 
 gb_internal bool thread_safe_set_ast_file_from_id(i32 index, AstFile *file) {
 	bool ok = false;
 	GB_ASSERT(index >= 0);
-	mutex_lock(&global_error_collector.path_mutex);
+	// mutex_lock(&global_error_collector.path_mutex);
 	mutex_lock(&global_files_mutex);
 
 	if (index >= global_files.count) {
@@ -118,13 +118,13 @@ gb_internal bool thread_safe_set_ast_file_from_id(i32 index, AstFile *file) {
 		ok = true;
 	}
 	mutex_unlock(&global_files_mutex);
-	mutex_unlock(&global_error_collector.path_mutex);
+	// mutex_unlock(&global_error_collector.path_mutex);
 	return ok;
 }
 
 gb_internal String get_file_path_string(i32 index) {
 	GB_ASSERT(index >= 0);
-	mutex_lock(&global_error_collector.path_mutex);
+	// mutex_lock(&global_error_collector.path_mutex);
 	mutex_lock(&global_files_mutex);
 
 	String path = {};
@@ -133,13 +133,13 @@ gb_internal String get_file_path_string(i32 index) {
 	}
 
 	mutex_unlock(&global_files_mutex);
-	mutex_unlock(&global_error_collector.path_mutex);
+	// mutex_unlock(&global_error_collector.path_mutex);
 	return path;
 }
 
 gb_internal AstFile *thread_safe_get_ast_file_from_id(i32 index) {
 	GB_ASSERT(index >= 0);
-	mutex_lock(&global_error_collector.path_mutex);
+	// mutex_lock(&global_error_collector.path_mutex);
 	mutex_lock(&global_files_mutex);
 
 	AstFile *file = nullptr;
@@ -148,7 +148,7 @@ gb_internal AstFile *thread_safe_get_ast_file_from_id(i32 index) {
 	}
 
 	mutex_unlock(&global_files_mutex);
-	mutex_unlock(&global_error_collector.path_mutex);
+	// mutex_unlock(&global_error_collector.path_mutex);
 	return file;
 }
 
diff --git a/src/llvm_backend.cpp b/src/llvm_backend.cpp
index ff17e9c10..11b979774 100644
--- a/src/llvm_backend.cpp
+++ b/src/llvm_backend.cpp
@@ -2097,8 +2097,6 @@ gb_internal GB_COMPARE_PROC(llvm_global_entity_cmp) {
 }
 
 gb_internal void lb_create_global_procedures_and_types(lbGenerator *gen, CheckerInfo *info, bool do_threading) {
-	auto *min_dep_set = &info->minimum_dependency_set;
-
 	for (Entity *e : info->entities) {
 		String  name  = e->token.string;
 		Scope * scope = e->scope;
@@ -2135,11 +2133,16 @@ gb_internal void lb_create_global_procedures_and_types(lbGenerator *gen, Checker
 			}
 		}
 
-		if (!polymorphic_struct && !ptr_set_exists(min_dep_set, e)) {
+		if (!polymorphic_struct && e->min_dep_count.load(std::memory_order_relaxed) == 0) {
 			// NOTE(bill): Nothing depends upon it so doesn't need to be built
 			continue;
 		}
 
+		// if (!polymorphic_struct && !ptr_set_exists(min_dep_set, e)) {
+		// 	// NOTE(bill): Nothing depends upon it so doesn't need to be built
+		// 	continue;
+		// }
+
 		lbModule *m = &gen->default_module;
 		if (USE_SEPARATE_MODULES) {
 			m = lb_module_of_entity(gen, e);
@@ -2845,8 +2848,6 @@ gb_internal bool lb_generate_code(lbGenerator *gen) {
 	lbModule *default_module = &gen->default_module;
 	CheckerInfo *info = gen->info;
 
-	auto *min_dep_set = &info->minimum_dependency_set;
-
 	switch (build_context.metrics.arch) {
 	case TargetArch_amd64: 
 	case TargetArch_i386:
@@ -3184,10 +3185,14 @@ gb_internal bool lb_generate_code(lbGenerator *gen) {
 			continue;
 		}
 
-		if (!ptr_set_exists(min_dep_set, e)) {
+		if (e->min_dep_count.load(std::memory_order_relaxed) == 0) {
 			continue;
 		}
 
+		// if (!ptr_set_exists(min_dep_set, e)) {
+		// 	continue;
+		// }
+
 		DeclInfo *decl = decl_info_of_entity(e);
 		if (decl == nullptr) {
 			continue;
diff --git a/src/llvm_backend_proc.cpp b/src/llvm_backend_proc.cpp
index f2e6662c8..06829efab 100644
--- a/src/llvm_backend_proc.cpp
+++ b/src/llvm_backend_proc.cpp
@@ -798,9 +798,8 @@ gb_internal void lb_end_procedure_body(lbProcedure *p) {
 gb_internal void lb_build_nested_proc(lbProcedure *p, AstProcLit *pd, Entity *e) {
 	GB_ASSERT(pd->body != nullptr);
 	lbModule *m = p->module;
-	auto *min_dep_set = &m->info->minimum_dependency_set;
 
-	if (ptr_set_exists(min_dep_set, e) == false) {
+	if (e->min_dep_count.load(std::memory_order_relaxed) == 0) {
 		// NOTE(bill): Nothing depends upon it so doesn't need to be built
 		return;
 	}
diff --git a/src/llvm_backend_stmt.cpp b/src/llvm_backend_stmt.cpp
index 5481ca447..590920b59 100644
--- a/src/llvm_backend_stmt.cpp
+++ b/src/llvm_backend_stmt.cpp
@@ -3,8 +3,6 @@ gb_internal void lb_build_constant_value_decl(lbProcedure *p, AstValueDecl *vd)
 		return;
 	}
 
-	auto *min_dep_set = &p->module->info->minimum_dependency_set;
-
 	for (Ast *ident : vd->names) {
 		GB_ASSERT(ident->kind == Ast_Ident);
 		Entity *e = entity_of_node(ident);
@@ -21,7 +19,7 @@ gb_internal void lb_build_constant_value_decl(lbProcedure *p, AstValueDecl *vd)
 			}
 		}
 
-		if (!polymorphic_struct && !ptr_set_exists(min_dep_set, e)) {
+		if (!polymorphic_struct && e->min_dep_count.load(std::memory_order_relaxed) == 0) {
 			continue;
 		}
 
@@ -56,7 +54,7 @@ gb_internal void lb_build_constant_value_decl(lbProcedure *p, AstValueDecl *vd)
 			if (gpd) {
 				rw_mutex_shared_lock(&gpd->mutex);
 				for (Entity *e : gpd->procs) {
-					if (!ptr_set_exists(min_dep_set, e)) {
+					if (e->min_dep_count.load(std::memory_order_relaxed) == 0) {
 						continue;
 					}
 					DeclInfo *d = decl_info_of_entity(e);
diff --git a/src/main.cpp b/src/main.cpp
index db4dee080..184b1eaac 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -3050,7 +3050,8 @@ gb_internal void print_show_unused(Checker *c) {
 		if (e->token.string == "_") {
 			continue;
 		}
-		if (ptr_set_exists(&info->minimum_dependency_set, e)) {
+
+		if (e->min_dep_count.load(std::memory_order_relaxed) > 0) {
 			continue;
 		}
 		array_add(&unused, e);
diff --git a/src/name_canonicalization.cpp b/src/name_canonicalization.cpp
index 6a4538e26..8bacfabc6 100644
--- a/src/name_canonicalization.cpp
+++ b/src/name_canonicalization.cpp
@@ -57,10 +57,13 @@ gb_internal isize type_set__find(TypeSet *s, TypeInfoPair pair) {
 		usize mask = s->capacity-1;
 		usize hash_index = cast(usize)hash & mask;
 		for (usize i = 0; i < s->capacity; i++) {
-			Type *key = s->keys[hash_index].type;
-			if (are_types_identical_unique_tuples(key, pair.type)) {
+			auto *e = &s->keys[hash_index];
+			u64 hash  = e->hash;
+			Type *key = e->type;
+			if (hash == pair.hash &&
+			    are_types_identical_unique_tuples(key, pair.type)) {
 				return hash_index;
-			} else if (key == 0) {
+			} else if (key == nullptr) {
 				return -1;
 			}
 			hash_index = (hash_index+1)&mask;
@@ -164,6 +167,48 @@ gb_internal bool type_set_update(TypeSet *s, Type *ptr) { // returns true if it
 	return type_set_update(s, pair);
 }
 
+gb_internal bool type_set_update_with_mutex(TypeSet *s, TypeInfoPair pair, RWSpinLock *m) { // returns true if it previously existsed
+	rwlock_acquire_upgrade(m);
+	if (type_set_exists(s, pair)) {
+		rwlock_release_upgrade(m);
+		return true;
+	}
+
+	rwlock_release_upgrade_and_acquire_write(m);
+	defer (rwlock_release_write(m));
+
+	if (s->keys == nullptr) {
+		type_set_init(s);
+	} else if (type_set__full(s)) {
+		type_set_grow(s);
+	}
+	GB_ASSERT(s->count < s->capacity);
+	GB_ASSERT(s->capacity >= 0);
+
+	usize mask = s->capacity-1;
+	usize hash = cast(usize)pair.hash;
+	usize hash_index = (cast(usize)hash) & mask;
+	GB_ASSERT(hash_index < s->capacity);
+	for (usize i = 0; i < s->capacity; i++) {
+		TypeInfoPair *key = &s->keys[hash_index];
+		GB_ASSERT(!are_types_identical_unique_tuples(key->type, pair.type));
+		if (key->hash == TYPE_SET_TOMBSTONE || key->hash == 0) {
+			*key = pair;
+			s->count++;
+			return false;
+		}
+		hash_index = (hash_index+1)&mask;
+	}
+
+	GB_PANIC("ptr set out of memory");
+	return false;
+}
+
+gb_internal bool type_set_update_with_mutex(TypeSet *s, Type *ptr, RWSpinLock *m) { // returns true if it previously existsed
+	TypeInfoPair pair = {ptr, type_hash_canonical_type(ptr)};
+	return type_set_update_with_mutex(s, pair, m);
+}
+
 
 gb_internal Type *type_set_add(TypeSet *s, Type *ptr) {
 	type_set_update(s, ptr);
@@ -328,12 +373,20 @@ gb_internal u64 type_hash_canonical_type(Type *type) {
 	if (type == nullptr) {
 		return 0;
 	}
+	u64 prev_hash = type->canonical_hash.load(std::memory_order_relaxed);
+	if (prev_hash != 0) {
+		return prev_hash;
+	}
+
 	u64 hash = fnv64a(nullptr, 0);
 	TypeWriter w = {};
 	type_writer_make_hasher(&w, &hash);
 	write_type_to_canonical_string(&w, type);
+	hash = hash ? hash : 1;
+
+	type->canonical_hash.store(hash, std::memory_order_relaxed);
 
-	return hash ? hash : 1;
+	return hash;
 }
 
 gb_internal String type_to_canonical_string(gbAllocator allocator, Type *type) {
diff --git a/src/name_canonicalization.hpp b/src/name_canonicalization.hpp
index 304aff42e..00b450fbe 100644
--- a/src/name_canonicalization.hpp
+++ b/src/name_canonicalization.hpp
@@ -102,6 +102,8 @@ gb_internal Type *type_set_add    (TypeSet *s, Type *ptr);
 gb_internal Type *type_set_add    (TypeSet *s, TypeInfoPair pair);
 gb_internal bool  type_set_update (TypeSet *s, Type *ptr); // returns true if it previously existed
 gb_internal bool  type_set_update (TypeSet *s, TypeInfoPair pair); // returns true if it previously existed
+gb_internal bool  type_set_update_with_mutex(TypeSet *s, TypeInfoPair pair, RWSpinLock *m);
+gb_internal bool  type_set_update_with_mutex(TypeSet *s, Type *ptr, RWSpinLock *m);
 gb_internal bool  type_set_exists (TypeSet *s, Type *ptr);
 gb_internal void  type_set_remove (TypeSet *s, Type *ptr);
 gb_internal void  type_set_clear  (TypeSet *s);
diff --git a/src/ptr_set.cpp b/src/ptr_set.cpp
index 5097e2bb6..06c1e4a58 100644
--- a/src/ptr_set.cpp
+++ b/src/ptr_set.cpp
@@ -135,6 +135,44 @@ gb_internal bool ptr_set_update(PtrSet<T> *s, T ptr) { // returns true if it pre
 }
 
 template <typename T>
+gb_internal bool ptr_set_update_with_mutex(PtrSet<T> *s, T ptr, RWSpinLock *m) { // returns true if it previously existsed
+	rwlock_acquire_upgrade(m);
+	if (ptr_set_exists(s, ptr)) {
+		rwlock_release_upgrade(m);
+		return true;
+	}
+
+	rwlock_release_upgrade_and_acquire_write(m);
+	defer (rwlock_release_write(m));
+
+	if (s->keys == nullptr) {
+		ptr_set_init(s);
+	} else if (ptr_set__full(s)) {
+		ptr_set_grow(s);
+	}
+	GB_ASSERT(s->count < s->capacity);
+	GB_ASSERT(s->capacity >= 0);
+
+	usize mask = s->capacity-1;
+	u32 hash = ptr_map_hash_key(ptr);
+	usize hash_index = (cast(usize)hash) & mask;
+	GB_ASSERT(hash_index < s->capacity);
+	for (usize i = 0; i < s->capacity; i++) {
+		T *key = &s->keys[hash_index];
+		GB_ASSERT(*key != ptr);
+		if (*key == (T)PtrSet<T>::TOMBSTONE || *key == 0) {
+			*key = ptr;
+			s->count++;
+			return false;
+		}
+		hash_index = (hash_index+1)&mask;
+	}
+
+	GB_PANIC("ptr set out of memory");
+	return false;
+}
+
+template <typename T>
 gb_internal T ptr_set_add(PtrSet<T> *s, T ptr) {
 	ptr_set_update(s, ptr);
 	return ptr;
diff --git a/src/threading.cpp b/src/threading.cpp
index a0d1c4049..f1d9264e3 100644
--- a/src/threading.cpp
+++ b/src/threading.cpp
@@ -448,6 +448,44 @@ gb_internal void semaphore_wait(Semaphore *s) {
 	}
 #endif
 
+static const int RWLOCK_WRITER   = 1;
+static const int RWLOCK_UPGRADED = 2;
+static const int RWLOCK_READER   = 4;
+struct RWSpinLock {
+	Futex bits;
+};
+
+void rwlock_release_write(RWSpinLock *l) {
+	l->bits.fetch_and(~(RWLOCK_WRITER | RWLOCK_UPGRADED), std::memory_order_release);
+	futex_signal(&l->bits);
+}
+
+bool rwlock_try_acquire_upgrade(RWSpinLock *l) {
+	int value = l->bits.fetch_or(RWLOCK_UPGRADED, std::memory_order_acquire);
+	return (value & (RWLOCK_UPGRADED | RWLOCK_WRITER)) == 0;
+}
+
+void rwlock_acquire_upgrade(RWSpinLock *l) {
+	while (!rwlock_try_acquire_upgrade(l)) {
+		futex_wait(&l->bits, RWLOCK_UPGRADED);
+	}
+}
+void rwlock_release_upgrade(RWSpinLock *l) {
+	l->bits.fetch_add(-RWLOCK_UPGRADED, std::memory_order_acq_rel);
+}
+
+bool rwlock_try_release_upgrade_and_acquire_write(RWSpinLock *l) {
+	int expect = RWLOCK_UPGRADED;
+	return l->bits.compare_exchange_strong(expect, RWLOCK_WRITER, std::memory_order_acq_rel);
+}
+
+void rwlock_release_upgrade_and_acquire_write(RWSpinLock *l) {
+	while (!rwlock_try_release_upgrade_and_acquire_write(l)) {
+		futex_wait(&l->bits, RWLOCK_WRITER);
+	}
+}
+
+
 struct Parker {
 	Futex state;
 };
diff --git a/src/types.cpp b/src/types.cpp
index 6b94b1690..44f9394c7 100644
--- a/src/types.cpp
+++ b/src/types.cpp
@@ -334,6 +334,7 @@ struct Type {
 	// NOTE(bill): These need to be at the end to not affect the unionized data
 	std::atomic<i64> cached_size;
 	std::atomic<i64> cached_align;
+	std::atomic<u64> canonical_hash;
 	std::atomic<u32> flags; // TypeFlag
 	bool failure;
 };