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Fix integer overflow in next_power_of_two

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This commit is contained in:
Matt Brubeck 2016-05-11 08:35:59 -07:00
parent a834bc1ec7
commit 56e927a9e4
1 changed files with 1 additions and 12 deletions
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13
components/util/workqueue.rs
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@ -85,17 +85,6 @@ const SPINS_UNTIL_BACKOFF: u32 = 128;
const BACKOFF_INCREMENT_IN_US: u32 = 5;
const BACKOFFS_UNTIL_CONTROL_CHECK: u32 = 6;
fn next_power_of_two(mut v: u32) -> u32 {
v -= 1;
v |= v >> 1;
v |= v >> 2;
v |= v >> 4;
v |= v >> 8;
v |= v >> 16;
v += 1;
v
}
#[cfg(not(windows))]
fn sleep_microseconds(usec: u32) {
unsafe {
@ -114,7 +103,7 @@ impl<QueueData: Sync, WorkData: Send> WorkerThread<QueueData, WorkData> {
/// The main logic. This function starts up the worker and listens for
/// messages.
fn start(&mut self) {
let deque_index_mask = next_power_of_two(self.other_deques.len() as u32) - 1;
let deque_index_mask = (self.other_deques.len() as u32).next_power_of_two() - 1;
loop {
// Wait for a start message.
let (mut deque, ref_count, queue_data) = match self.port.recv().unwrap() {