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Kernel: Make Thread refcounted

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Similar to Process, we need to make Thread refcounted. This will solve
problems that will appear once we schedule threads on more than one
processor. This allows us to hold onto threads without necessarily
holding the scheduler lock for the entire duration.
This commit is contained in:
Tom 2020-09-27 08:53:35 -06:00 • committed by Andreas Kling
parent 079486ed7e
commit 838d9fa251
14 changed files with 136 additions and 90 deletions
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32
Kernel/Thread.h
View file

@ -32,6 +32,8 @@
#include <AK/OwnPtr.h>
#include <AK/String.h>
#include <AK/Vector.h>
#include <AK/WeakPtr.h>
#include <AK/Weakable.h>
#include <Kernel/Arch/i386/CPU.h>
#include <Kernel/Forward.h>
#include <Kernel/KResult.h>
@ -66,7 +68,9 @@ struct ThreadSpecificData {
#define THREAD_AFFINITY_DEFAULT 0xffffffff
class Thread {
class Thread
: public RefCounted<Thread>
, public Weakable<Thread> {
AK_MAKE_NONCOPYABLE(Thread);
AK_MAKE_NONMOVABLE(Thread);
@ -82,7 +86,7 @@ public:
explicit Thread(NonnullRefPtr<Process>);
~Thread();
static Thread* from_tid(ThreadID);
static RefPtr<Thread> from_tid(ThreadID);
static void finalize_dying_threads();
ThreadID tid() const { return m_tid; }
@ -143,9 +147,23 @@ public:
String backtrace();
Vector<FlatPtr> raw_backtrace(FlatPtr ebp, FlatPtr eip) const;
const String& name() const { return m_name; }
void set_name(const StringView& s) { m_name = s; }
void set_name(String&& name) { m_name = move(name); }
String name() const
{
// Because the name can be changed, we can't return a const
// reference here. We must make a copy
ScopedSpinLock lock(m_lock);
return m_name;
}
void set_name(const StringView& s)
{
ScopedSpinLock lock(m_lock);
m_name = s;
}
void set_name(String&& name)
{
ScopedSpinLock lock(m_lock);
m_name = move(name);
}
void finalize();
@ -452,7 +470,7 @@ public:
return block<ConditionBlocker>(nullptr, state_string, move(condition));
}
BlockResult wait_on(WaitQueue& queue, const char* reason, timeval* timeout = nullptr, Atomic<bool>* lock = nullptr, Thread* beneficiary = nullptr);
BlockResult wait_on(WaitQueue& queue, const char* reason, timeval* timeout = nullptr, Atomic<bool>* lock = nullptr, RefPtr<Thread> beneficiary = {});
void wake_from_queue();
void unblock();
@ -578,7 +596,7 @@ public:
return !m_is_joinable;
}
Thread* clone(Process&);
RefPtr<Thread> clone(Process&);
template<typename Callback>
static IterationDecision for_each_in_state(State, Callback);