Kernel: Scheduler now sends queued signals

kernel/include/kernel/Thread.h

@@ -37,6 +37,7 @@ namespace Kernel
 		BAN::ErrorOr<Thread*> clone(Process*, uintptr_t rsp, uintptr_t rip);
 		void setup_exec();
 
+		void handle_next_signal();
 		void handle_signal(int signal, uintptr_t& return_rsp, uintptr_t& return_rip);
 
 		pid_t tid() const { return m_tid; }

kernel/kernel/Process.cpp

@@ -794,6 +794,8 @@ namespace Kernel
 		if (signal < _SIGMIN || signal > _SIGMAX)
 			return BAN::Error::from_errno(EINVAL);
 		ASSERT(m_threads.size() == 1);
+		CriticalScope _;
+		Thread::current().m_signal_queue.push(signal);
 		Thread::current().handle_signal(signal, return_rsp, return_rip);
 		return 0;
 	}

kernel/kernel/Scheduler.cpp

@@ -212,6 +212,8 @@ namespace Kernel
 				current.set_started();
 				start_thread(current.rsp(), current.rip());
 			case Thread::State::Executing:
+				while (!current.m_signal_queue.empty())
+					current.handle_next_signal();
 				continue_thread(current.rsp(), current.rip());
 			case Thread::State::Terminating:
 				ENABLE_INTERRUPTS();

kernel/kernel/Thread.cpp

@@ -143,10 +143,20 @@ namespace Kernel
 		}
 	}
 
+	void Thread::handle_next_signal()
+	{
+		ASSERT(!interrupts_enabled());
+		ASSERT(!m_signal_queue.empty());
+		handle_signal(m_signal_queue.front(), m_rsp, m_rip);
+	}
+
 	void Thread::handle_signal(int signal, uintptr_t& return_rsp, uintptr_t& return_rip)
 	{
+		ASSERT(!interrupts_enabled());
 		ASSERT(signal >= _SIGMIN && signal <= _SIGMAX);
 		ASSERT(&Thread::current() == this);
+		ASSERT(!m_signal_queue.empty());
+		ASSERT(m_signal_queue.front() == signal);
 
 		// Skip masked (ignored) signals
 		if (m_signal_mask & (1ull << signal))
@@ -154,7 +164,6 @@ namespace Kernel
 
 		if (m_signal_handlers[signal])
 		{
-			asm volatile("cli");
 			write_to_stack(return_rsp, return_rip);
 			write_to_stack(return_rsp, signal);
 			write_to_stack(return_rsp, m_signal_handlers[signal]);
@@ -193,6 +202,8 @@ namespace Kernel
 				{
 					auto message = BAN::String::formatted("killed by signal {}\n", signal);
 					(void)process().tty().write(0, message.data(), message.size());
+
+					ENABLE_INTERRUPTS();
 					process().exit(128 + signal);
 					ASSERT_NOT_REACHED();
 				}
@@ -214,8 +225,6 @@ namespace Kernel
 			}
 		}
 
-		asm volatile("cli");
-		if (!m_signal_queue.empty() && m_signal_queue.front() == signal)
 		m_signal_queue.pop();
 	}