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Remove the fake memory profiler thread.

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Currently if you don't specify the '-m' option, a fake do-nothing memory
profiler thread gets created instead of the real one. It ignores all
events except for `Exit`. And the timer thread doesn't get created so no
`Print` events are sent.

This changeset instead always creates the real thread. If you specify
'-m' the *timer* thread is still absent and it won't print anything.
However, the memory profiler thread will respond to register/unregister
events, which is good, because if there's a bug in those (e.g.
double-registration of a particular name) it'll show up in invocations
that lack '-m'.
This commit is contained in:
Nicholas Nethercote 2015-03-11 19:51:58 -07:00
parent ece2711185
commit fa9ca206ef
1 changed files with 19 additions and 29 deletions
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48
components/util/memory.rs
View file

@ -243,38 +243,28 @@ pub struct MemoryProfiler {
impl MemoryProfiler {
pub fn create(period: Option<f64>) -> MemoryProfilerChan {
let (chan, port) = channel();
match period {
Some(period) => {
let period = Duration::milliseconds((period * 1000f64) as i64);
let chan = chan.clone();
spawn_named("Memory profiler timer".to_owned(), move || {
loop {
sleep(period);
if chan.send(MemoryProfilerMsg::Print).is_err() {
break;
}
// Create the timer thread if a period was provided.
if let Some(period) = period {
let period_ms = Duration::milliseconds((period * 1000f64) as i64);
let chan = chan.clone();
spawn_named("Memory profiler timer".to_owned(), move || {
loop {
sleep(period_ms);
if chan.send(MemoryProfilerMsg::Print).is_err() {
break;
}
});
// Spawn the memory profiler.
spawn_named("Memory profiler".to_owned(), move || {
let mut memory_profiler = MemoryProfiler::new(port);
memory_profiler.start();
});
}
None => {
// No-op to handle messages when the memory profiler is
// inactive.
spawn_named("Memory profiler".to_owned(), move || {
loop {
match port.recv() {
Err(_) | Ok(MemoryProfilerMsg::Exit) => break,
_ => {}
}
}
});
}
}
});
}
// Always spawn the memory profiler. If there is no timer thread it won't receive regular
// `Print` events, but it will still receive the other events.
spawn_named("Memory profiler".to_owned(), move || {
let mut memory_profiler = MemoryProfiler::new(port);
memory_profiler.start();
});
MemoryProfilerChan(chan)
}