From a97aa95c2302479093f53d43cfef3bc92359835b Mon Sep 17 00:00:00 2001
From: Jeremy Soller <jackpot51@gmail.com>
Date: Thu, 20 Oct 2016 21:49:47 -0600
Subject: [PATCH] Improve wait condition performance
---
sync/wait_condition.rs | 11 +++++------
1 file changed, 5 insertions(+), 6 deletions(-)
diff --git a/sync/wait_condition.rs b/sync/wait_condition.rs
index 997b4580..cb170265 100644
--- a/sync/wait_condition.rs
+++ b/sync/wait_condition.rs
@@ -1,6 +1,5 @@
use alloc::arc::Arc;
use collections::Vec;
-use core::mem;
use spin::{Mutex, RwLock};
use context::{self, Context};
@@ -13,17 +12,17 @@ pub struct WaitCondition {
impl WaitCondition {
pub fn new() -> WaitCondition {
WaitCondition {
- contexts: Mutex::new(Vec::new())
+ contexts: Mutex::new(Vec::with_capacity(16))
}
}
pub fn notify(&self) -> usize {
- let mut contexts = Vec::new();
- mem::swap(&mut *self.contexts.lock(), &mut contexts);
- for context_lock in contexts.iter() {
+ let mut contexts = self.contexts.lock();
+ let len = contexts.len();
+ while let Some(context_lock) = contexts.pop() {
context_lock.write().unblock();
}
- contexts.len()
+ len
}
pub fn wait(&self) {
--
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