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Lock stdout once when printing diagnostics (#1901)

Browse source 
https://doc.rust-lang.org/stable/std/io/struct.Stdout.html

> Each handle shares a global buffer of data to be written to the standard output stream.
> Access is also synchronized via a lock and
> explicit control over locking is available via the [`lock`](https://doc.rust-lang.org/stable/std/io/struct.Stdout.html#method.lock) method.
This commit is contained in:
messense 2023-01-16 10:04:00 +08:00 • committed by GitHub
parent d71a615b18
commit cb4f305ced
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1 changed files with 3 additions and 3 deletions
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6
ruff_cli/src/printer.rs
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@ -122,7 +122,7 @@ impl<'a> Printer<'a> {
} }
if matches!(self.violations, Violations::Hide) { if matches!(self.violations, Violations::Hide) {
let mut stdout = BufWriter::new(io::stdout()); let mut stdout = BufWriter::new(io::stdout().lock());
if matches!( if matches!(
self.format, self.format,
SerializationFormat::Text | SerializationFormat::Grouped SerializationFormat::Text | SerializationFormat::Grouped
@ -132,7 +132,7 @@ impl<'a> Printer<'a> {
return Ok(()); return Ok(());
} }
let mut stdout = BufWriter::new(io::stdout()); let mut stdout = BufWriter::new(io::stdout().lock());
match self.format { match self.format {
SerializationFormat::Json => { SerializationFormat::Json => {
writeln!( writeln!(
@ -312,7 +312,7 @@ impl<'a> Printer<'a> {
); );
} }
let mut stdout = BufWriter::new(io::stdout()); let mut stdout = BufWriter::new(io::stdout().lock());
if !diagnostics.messages.is_empty() { if !diagnostics.messages.is_empty() {
if self.log_level >= &LogLevel::Default { if self.log_level >= &LogLevel::Default {
writeln!(stdout)?; writeln!(stdout)?;