Kernel: Fix Process::exit() and where it is called from

cksum doesn't seem to work anymore on big files. I have to look
into this. It locks up after couple of seconds...

kernel/kernel/Process.cpp

@@ -1,5 +1,4 @@
 #include <BAN/StringView.h>
-#include <kernel/CriticalScope.h>
 #include <kernel/FS/VirtualFileSystem.h>
 #include <kernel/LockGuard.h>
 #include <kernel/Memory/MMU.h>
@@ -61,7 +60,8 @@ namespace Kernel
 
 	Process::~Process()
 	{
-		exit();
+		if (!m_threads.empty())
+			exit();
 	}
 
 	BAN::ErrorOr<Thread*> Process::add_thread(entry_t entry, void* data)
@@ -85,14 +85,24 @@ namespace Kernel
 		for (size_t i = 0; i < m_threads.size(); i++)
 			if (m_threads[i] == &thread)
 				m_threads.remove(i);
+		if (m_threads.empty())
+			exit();
 	}
 
 	void Process::exit()
 	{
-		CriticalScope _;
+		m_lock.lock();
 		m_threads.clear();
 		for (auto& open_fd : m_open_files)
 			open_fd.inode = nullptr;
+
+		dprintln("process {} exit", pid());
+		s_process_lock.lock();
+		for (size_t i = 0; i < s_processes.size(); i++)
+			if (s_processes[i] == this)
+				s_processes.remove(i);
+		s_process_lock.unlock();
+
 		Scheduler::get().set_current_process_done();
 	}
 

kernel/kernel/Scheduler.cpp

@@ -245,7 +245,8 @@ namespace Kernel
 
 	void Scheduler::set_current_process_done()
 	{
-		VERIFY_CLI();
+		VERIFY_STI();
+		DISABLE_INTERRUPTS();
 
 		pid_t pid = m_current_thread->thread->process().pid();
 
@@ -253,6 +254,7 @@ namespace Kernel
 		remove_threads(m_sleeping_threads, it->thread->process().pid() == pid);
 		remove_threads(m_active_threads, it != m_current_thread && it->thread->process().pid() == pid);
 
+		delete &m_current_thread->thread->process();
 		delete m_current_thread->thread;
 		remove_and_advance_current_thread();
 		execute_current_thread();