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//
// Copyright (C) 2021 The Android Open Source Project
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
//! ProfCollect tracing scheduler.
use std::sync::mpsc::{sync_channel, SyncSender};
use std::sync::Arc;
use std::sync::Mutex;
use std::thread;
use crate::config::{Config, PROFILE_OUTPUT_DIR, TRACE_OUTPUT_DIR};
use crate::trace_provider::{self, TraceProvider};
use anyhow::{anyhow, ensure, Context, Result};
pub struct Scheduler {
/// Signal to terminate the periodic collection worker thread, None if periodic collection is
/// not scheduled.
termination_ch: Option<SyncSender<()>>,
/// The preferred trace provider for the system.
trace_provider: Arc<Mutex<dyn TraceProvider + Send>>,
}
impl Scheduler {
pub fn new() -> Result<Self> {
let p = trace_provider::get_trace_provider()?;
Ok(Scheduler { termination_ch: None, trace_provider: p })
}
fn is_scheduled(&self) -> bool {
self.termination_ch.is_some()
}
pub fn schedule_periodic(&mut self, config: &Config) -> Result<()> {
ensure!(!self.is_scheduled(), "Already scheduled.");
let (sender, receiver) = sync_channel(1);
self.termination_ch = Some(sender);
// Clone config and trace_provider ARC for the worker thread.
let config = config.clone();
let trace_provider = self.trace_provider.clone();
thread::spawn(move || {
loop {
match receiver.recv_timeout(config.collection_interval) {
Ok(_) => break,
Err(_) => {
// Did not receive a termination signal, initiate trace event.
trace_provider.lock().unwrap().trace(
&TRACE_OUTPUT_DIR,
"periodic",
&config.sampling_period,
);
}
}
}
});
Ok(())
}
pub fn terminate_periodic(&mut self) -> Result<()> {
self.termination_ch
.as_ref()
.ok_or_else(|| anyhow!("Not scheduled"))?
.send(())
.context("Scheduler worker disappeared.")?;
self.termination_ch = None;
Ok(())
}
pub fn one_shot(&self, config: &Config, tag: &str) -> Result<()> {
let trace_provider = self.trace_provider.clone();
trace_provider.lock().unwrap().trace(&TRACE_OUTPUT_DIR, tag, &config.sampling_period);
Ok(())
}
pub fn process(&self, blocking: bool) -> Result<()> {
let trace_provider = self.trace_provider.clone();
let handle = thread::spawn(move || {
trace_provider
.lock()
.unwrap()
.process(&TRACE_OUTPUT_DIR, &PROFILE_OUTPUT_DIR)
.expect("Failed to process profiles.");
});
if blocking {
handle.join().map_err(|_| anyhow!("Profile process thread panicked."))?;
}
Ok(())
}
pub fn get_trace_provider_name(&self) -> &'static str {
self.trace_provider.lock().unwrap().get_name()
}
}
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