From c0e091b647b3637cf21fcd579f59ccb0b0cee185 Mon Sep 17 00:00:00 2001
From: Bananymous <oskari.alaranta@bananymous.com>
Date: Thu, 2 Jul 2026 19:50:07 +0300
Subject: [PATCH] LibC: Implement pthread_{get,set}attr_default_np

---
 userspace/libraries/LibC/include/pthread.h |  2 ++
 userspace/libraries/LibC/pthread.cpp       | 34 ++++++++++++++++------
 2 files changed, 27 insertions(+), 9 deletions(-)

diff --git a/userspace/libraries/LibC/include/pthread.h b/userspace/libraries/LibC/include/pthread.h
index afc8e65d..ecddc579 100644
--- a/userspace/libraries/LibC/include/pthread.h
+++ b/userspace/libraries/LibC/include/pthread.h
@@ -168,6 +168,8 @@ void		pthread_cleanup_push(void (*routine)(void*), void* arg);
 
 // non portable APIs
 int pthread_getattr_np(pthread_t thread, pthread_attr_t* attr);
+int pthread_getattr_default_np(pthread_attr_t* attr);
+int pthread_setattr_default_np(const pthread_attr_t* attr);
 
 #define _pthread_equal(t1, t2) ((t1) == (t2))
 
diff --git a/userspace/libraries/LibC/pthread.cpp b/userspace/libraries/LibC/pthread.cpp
index 68c98d02..81418b00 100644
--- a/userspace/libraries/LibC/pthread.cpp
+++ b/userspace/libraries/LibC/pthread.cpp
@@ -20,6 +20,17 @@ struct pthread_trampoline_info_t
 	void* arg;
 };
 
+static pthread_attr_t s_default_pthread_attr {
+	.inheritsched = PTHREAD_INHERIT_SCHED,
+	.schedparam   = {},
+	.schedpolicy  = SCHED_RR,
+	.detachstate  = PTHREAD_CREATE_JOINABLE,
+	.scope        = PTHREAD_SCOPE_SYSTEM,
+	.stackaddr    = nullptr,
+	.stacksize    = 8 * 1024 * 1024,
+	.guardsize    = static_cast<size_t>(getpagesize()),
+};
+
 static void _pthread_cancel_handler(int)
 {
 	uthread* uthread = _get_uthread();
@@ -260,15 +271,7 @@ int pthread_attr_destroy(pthread_attr_t* attr)
 
 int pthread_attr_init(pthread_attr_t* attr)
 {
-	*attr = {
-		.inheritsched = PTHREAD_INHERIT_SCHED,
-		.schedparam = {},
-		.schedpolicy = SCHED_RR,
-		.detachstate = PTHREAD_CREATE_JOINABLE,
-		.scope = PTHREAD_SCOPE_SYSTEM,
-		.stacksize = Kernel::Thread::userspace_stack_size,
-		.guardsize = static_cast<size_t>(getpagesize()),
-	};
+	*attr = s_default_pthread_attr;
 	return 0;
 }
 
@@ -1322,6 +1325,19 @@ int pthread_getattr_np(pthread_t thread, pthread_attr_t* attr)
 	return 0;
 }
 
+int pthread_getattr_default_np(pthread_attr_t* attr)
+{
+	*attr = s_default_pthread_attr;
+	return 0;
+}
+
+int pthread_setattr_default_np(const pthread_attr_t* attr)
+{
+	// TODO: validate, make thread safe?
+	s_default_pthread_attr = *attr;
+	return 0;
+}
+
 static void load_dynamic_tls_module(size_t module)
 {
 	auto* uthread = _get_uthread();