Thread: Make g_next_id atomic

kernel/src/main.cpp

@@ -49,6 +49,7 @@ Result<void> init()
     kinfoln("Used memory:     %s", to_dynamic_unit(MemoryManager::used()).release_value().chars());
     kinfoln("Reserved memory: %s", to_dynamic_unit(MemoryManager::reserved()).release_value().chars());
 
+    Thread::init();
     Scheduler::init();
 
     TRY(Scheduler::new_kernel_thread(async_thread));

kernel/src/thread/Thread.cpp

@@ -1,10 +1,16 @@
 #include "thread/Thread.h"
 #include <luna/Alloc.h>
+#include <luna/Atomic.h>
 
-static u64 g_next_id = 1;
+static Atomic<u64> g_next_id;
 
 DoublyLinkedList<Thread> g_threads;
 
+void Thread::init()
+{
+    g_next_id = 1;
+}
+
 Result<Thread*> new_thread()
 {
     Thread* thread = TRY(make<Thread>());

kernel/src/thread/Thread.h

@@ -47,6 +47,8 @@ struct Thread : public DoublyLinkedListNode<Thread>
 
     void set_sp(u64 sp);
     u64 sp();
+
+    static void init();
 };
 
 void switch_context(Thread* old_thread, Thread* new_thread, Registers* regs);