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use serde_json::to_writer;
use std::{
thread,
io::Write,
sync::{
Mutex,
mpsc::{channel, Receiver, Sender},
atomic::{AtomicUsize, Ordering},
},
};
use crate::{
local::{Local, LOCAL},
Args,
Base,
Event,
};
lazy_static! {
pub static ref GLOBAL: Mutex<Global> = Mutex::new(Global::new());
}
#[derive(Clone)]
struct Thread {
name: String,
pid: usize,
sort_index: Option<usize>,
}
pub struct Global {
tx: Sender<Event>,
rx: Receiver<Event>,
threads: Vec<Thread>,
skip: AtomicUsize,
}
impl Global {
fn new() -> Self {
let (tx, rx) = channel();
Self {
tx, rx,
threads: Vec::new(),
skip: AtomicUsize::new(0),
}
}
pub fn create_sender(&self) -> Sender<Event> {
self.tx.clone()
}
pub fn register_thread(&mut self, pid: usize, sort_index: Option<usize>) {
let id = self.threads.len();
let current = thread::current();
let tid = current.id();
let name = current.name()
.map(|s| s.to_string())
.unwrap_or_else(|| format!("<unnamed-{}-{:?}>", id, tid));
let tid = self.threads.len();
self.threads.push(Thread {
name, sort_index, pid,
});
LOCAL.with(|local| {
assert!(local.borrow().is_none());
*local.borrow_mut() = Some(Local::new(tid, pid, self.tx.clone()));
});
}
pub fn write_profile<W: Write>(&self, mut w: W) {
self.tx.send(Event::Barrier).ok();
let skip = self.skip.swap(self.threads.len(), Ordering::Relaxed);
let names = self.threads.iter()
.skip(skip)
.cloned()
.enumerate()
.map(|(tid, th)| Event::Meta {
base: Base {
name: "thread_name".into(),
tid,
pid: th.pid,
cat: None,
args: Args::Name { name: th.name.into() },
cname: None,
},
});
let sort_index = self.threads.iter()
.skip(skip)
.cloned()
.enumerate()
.filter_map(|(i, th)| th.sort_index.map(|idx| (i, idx, th.pid)))
.map(|(tid, sort_index, pid)| Event::Meta {
base: Base {
name: "thread_sort_index".into(),
tid,
pid,
cat: None,
args: Args::SortIndex { sort_index },
cname: None,
},
});
let iter = names
.chain(sort_index)
.chain(self.rx.try_iter().take_while(|e| !e.is_barrier()));
for e in iter {
to_writer(&mut w, &e).unwrap();
w.write_all(b",\n").unwrap();
}
}
}