sched: add 'pinned' attribute to threads

arch/x64/arch-switch.hh

@@ -53,7 +53,8 @@ void thread::switch_to_first()
 
 void thread::init_stack()
 {
-    void** stacktop = reinterpret_cast<void**>(_stack.begin + _stack.size);
+    auto& stack = _attr.stack;
+    void** stacktop = reinterpret_cast<void**>(stack.begin + stack.size);
     *--stacktop = this;
     *--stacktop = reinterpret_cast<void*>(thread_main);
     _state.rsp = stacktop;

core/sched.cc

@@ -109,7 +109,7 @@ thread::thread(std::function<void ()> func, attr attr, bool main)
     : _func(func)
     , _on_runqueue(!main)
     , _waiting(false)
-    , _stack(attr.stack)
+    , _attr(attr)
     , _terminated(false)
     , _joiner()
 {
@@ -197,7 +197,7 @@ void thread::join()
 
 thread::stack_info thread::get_stack_info()
 {
-    return _stack;
+    return _attr.stack;
 }
 
 timer_list::callback_dispatch::callback_dispatch()

include/sched.hh

@@ -61,6 +61,7 @@ public:
     };
     struct attr {
         stack_info stack;
+        bool pinned;
     };
 
 public:
@@ -93,7 +94,7 @@ private:
     thread_control_block* _tcb;
     bool _on_runqueue;
     std::atomic_bool _waiting;
-    stack_info _stack;
+    attr _attr;
     cpu* _cpu;
     bool _terminated;
     bi::list<timer> _active_timers;