Kernel: Disable SMP message handling while blocking a thread

There were some race conditions on a thread getting unblocked before being moved to the block queue
2026-07-20 04:07:23 +03:00
parent 46e2d665e9
commit edc95e1c09
3 changed files with 24 additions and 11 deletions
@@ -104,10 +104,17 @@ namespace Kernel
 		static void pause()
 		{
 			__builtin_ia32_pause();
-			if (is_smp_enabled())
+			if (is_smp_enabled() && !smp_messages_disabled())
 				handle_smp_messages();
 		}

+		static bool smp_messages_disabled() { return read_gs_sized<bool>(offsetof(Processor, m_smp_messages_disabled)); }
+		static void set_disable_smp_messages(bool disabled)
+		{
+			ASSERT(smp_messages_disabled() != disabled);
+			write_gs_sized<bool>(offsetof(Processor, m_smp_messages_disabled), disabled);
+		}
+
 		vaddr_t stack_top_vaddr() const { return m_stack_vaddr + s_stack_size; }
 		paddr_t stack_top_paddr() const { return m_stack_paddr + s_stack_size; }

@@ -198,6 +205,8 @@ namespace Kernel
 		ProcessorID m_id { 0 };
 		uint8_t m_index { 0 };

+		bool m_smp_messages_disabled { false };
+
 		vaddr_t m_thread_syscall_stack;

 		Thread* m_sse_thread { nullptr };