RGBCube/serenity
1
Fork 0
mirror of https://github.com/RGBCube/serenity synced 2025-07-27 10:27:35 +00:00
Code Issues Activity Actions

Kernel: Introduce the DeviceManagement singleton

Browse source 
This singleton simplifies many aspects that we struggled with before:
1. There's no need to make derived classes of Device expose the
constructor as public anymore. The singleton is a friend of them, so he
can call the constructor. This solves the issue with try_create_device
helper neatly, hopefully for good.
2. Getting a reference of the NullDevice is now being done from this
singleton, which means that NullDevice no longer needs to use its own
singleton, and we can apply the try_create_device helper on it too :)
3. We can now defer registration completely after the Device constructor
which means the Device constructor is merely assigning the major and
minor numbers of the Device, and the try_create_device helper ensures it
calls the after_inserting method immediately after construction. This
creates a great opportunity to make registration more OOM-safe.
This commit is contained in:
Liav A 2021-09-11 09:19:20 +03:00 • committed by Idan Horowitz
parent 9aa6dd6b78
commit aee4786d8e
43 changed files with 244 additions and 123 deletions
Download patch file Download diff file Expand all files Collapse all files

14
Kernel/Devices/Device.h
View file

@ -27,14 +27,6 @@
namespace Kernel {
template<typename DeviceType, typename... Args>
inline KResultOr<NonnullRefPtr<DeviceType>> try_create_device(Args&&... args)
{
auto device = TRY(adopt_nonnull_ref_or_enomem(new DeviceType(forward<Args>(args)...)));
device->after_inserting();
return device;
}
class Device : public File {
protected:
enum class State {
@ -57,10 +49,6 @@ public:
virtual bool is_device() const override { return true; }
virtual void before_removing() override;
virtual void after_inserting();
static void for_each(Function<void(Device&)>);
static Device* get_device(unsigned major, unsigned minor);
void process_next_queued_request(Badge<AsyncDeviceRequest>, const AsyncDeviceRequest&);
template<typename AsyncRequestType, typename... Args>
@ -80,8 +68,6 @@ protected:
void set_uid(UserID uid) { m_uid = uid; }
void set_gid(GroupID gid) { m_gid = gid; }
static MutexProtected<HashMap<u32, Device*>>& all_devices();
private:
unsigned m_major { 0 };
unsigned m_minor { 0 };