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Use signals for delivering input events

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This patch changes both the Input::Session interface and the skeleton
for the server-side implementation of this interface
('input/component.h').

The Input::Session interface offers a new 'sigh' function, which can be
called be the client to register a signal handler. The signal handler
gets notified on the arrival of new input. This alleviates the need to
poll for input events at the client side.

The server-side skeleton for implementing input services underwent a
redesign to make it more modular and robust. I.e., there are no
global functions needed at the server side and the event-queue
enable/disable mechanism is implemented at a central place (in the root
component) rather than inside each driver.

Fixes #46
This commit is contained in:
Norman Feske
2014-05-07 10:33:20 +02:00
committed by Christian Helmuth
parent 6c10bfe049
commit 0ed68a56b7
39 changed files with 643 additions and 733 deletions
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11
repos/os/src/server/loader/input.h
View File

@ -66,11 +66,11 @@ namespace Input {
** Input session interface **
*****************************/
Dataspace_capability dataspace() { return _real_input.dataspace(); }
Dataspace_capability dataspace() override { return _real_input.dataspace(); }
bool is_pending() const { return _real_input.is_pending(); }
bool is_pending() const override { return _real_input.is_pending(); }
int flush()
int flush() override
{
/* translate mouse position to child's coordinate system */
Transformer::Delta delta = _transformer.delta();
@ -97,6 +97,11 @@ namespace Input {
return num_ev;
}
void sigh(Signal_context_capability sigh) override
{
_real_input.sigh(sigh);
}
};
}

11
repos/os/src/server/nit_fb/main.cc
View File

@ -82,11 +82,11 @@ namespace Input {
** Input session interface **
*****************************/
Genode::Dataspace_capability dataspace() { return _to_input_ds; }
Genode::Dataspace_capability dataspace() override { return _to_input_ds; }
bool is_pending() const { return _from_input->is_pending(); }
bool is_pending() const override { return _from_input->is_pending(); }
int flush()
int flush() override
{
/* flush events at input session */
int num_events = _from_input->flush();
@ -103,6 +103,11 @@ namespace Input {
}
return num_events;
}
void sigh(Genode::Signal_context_capability sigh) override
{
_from_input->sigh(sigh);
}
};
}

21
repos/os/src/server/nitpicker/main.cc
View File

@ -257,8 +257,19 @@ class Input::Session_component : public Genode::Rpc_object<Session>
Event _ev_buf[MAX_EVENTS];
unsigned _num_ev = 0;
Signal_context_capability _sigh;
public:
/**
* Wake up client
*/
void submit_signal()
{
if (_sigh.valid())
Signal_transmitter(_sigh).submit();
}
/**
* Enqueue event into local event buffer of the input session
*/
@ -269,6 +280,8 @@ class Input::Session_component : public Genode::Rpc_object<Session>
/* insert event into local event buffer */
_ev_buf[_num_ev++] = *ev;
submit_signal();
}
@ -276,11 +289,11 @@ class Input::Session_component : public Genode::Rpc_object<Session>
** Input session interface **
*****************************/
Dataspace_capability dataspace() { return _ev_ram_ds.cap(); }
Dataspace_capability dataspace() override { return _ev_ram_ds.cap(); }
bool is_pending() const { return _num_ev > 0; }
bool is_pending() const override { return _num_ev > 0; }
int flush()
int flush() override
{
unsigned ev_cnt;
@ -292,6 +305,8 @@ class Input::Session_component : public Genode::Rpc_object<Session>
_num_ev = 0;
return ev_cnt;
}
void sigh(Genode::Signal_context_capability sigh) override { _sigh = sigh; }
};