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Event support - demonstration in example scheme

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This commit is contained in:
Jeremy Soller 2016-09-23 17:54:39 -06:00
parent 616dfbc055
commit 0e8487cf83
12 changed files with 239 additions and 31 deletions
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27
drivers/vesad/src/main.rs
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@ -13,7 +13,7 @@ use std::fs::File;
use std::io::{Read, Write};
use std::{slice, thread};
use ransid::{Console, Event};
use syscall::{physmap, physunmap, Packet, Result, Scheme, MAP_WRITE, MAP_WRITE_COMBINE};
use syscall::{physmap, physunmap, Packet, Result, Scheme, EVENT_READ, MAP_WRITE, MAP_WRITE_COMBINE};
use display::Display;
use mode_info::VBEModeInfo;
@ -26,7 +26,8 @@ pub mod primitive;
struct DisplayScheme {
console: RefCell<Console>,
display: RefCell<Display>,
input: RefCell<VecDeque<u8>>
input: RefCell<VecDeque<u8>>,
requested: RefCell<usize>
}
impl Scheme for DisplayScheme {
@ -43,6 +44,7 @@ impl Scheme for DisplayScheme {
}
fn fevent(&self, _id: usize, flags: usize) -> Result<usize> {
*self.requested.borrow_mut() = flags;
println!("fevent {:X}", flags);
Ok(0)
}
@ -126,7 +128,8 @@ fn main() {
unsafe { slice::from_raw_parts_mut(onscreen as *mut u32, size) },
unsafe { slice::from_raw_parts_mut(offscreen as *mut u32, size) }
)),
input: RefCell::new(VecDeque::new())
input: RefCell::new(VecDeque::new()),
requested: RefCell::new(0)
};
let mut blocked = VecDeque::new();
@ -134,18 +137,36 @@ fn main() {
let mut packet = Packet::default();
socket.read(&mut packet).expect("vesad: failed to read display scheme");
//println!("vesad: {:?}", packet);
// If it is a read packet, and there is no data, block it. Otherwise, handle packet
if packet.a == syscall::number::SYS_READ && packet.d > 0 && scheme.input.borrow().is_empty() {
blocked.push_back(packet);
} else {
scheme.handle(&mut packet);
socket.write(&packet).expect("vesad: failed to write display scheme");
}
// If there are blocked readers, and data is available, handle them
while ! scheme.input.borrow().is_empty() {
if let Some(mut packet) = blocked.pop_front() {
scheme.handle(&mut packet);
socket.write(&packet).expect("vesad: failed to write display scheme");
} else {
break;
}
}
// If there are requested events, and data is available, send a notification
if ! scheme.input.borrow().is_empty() && *scheme.requested.borrow() & EVENT_READ == EVENT_READ {
let event_packet = Packet {
id: 0,
a: syscall::number::SYS_FEVENT,
b: 0,
c: EVENT_READ,
d: scheme.input.borrow().len()
};
socket.write(&event_packet).expect("vesad: failed to write display scheme");
}
}
});
}