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Improve comments in sync and arc a bit more.

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This commit is contained in:
Ben Blum 2013-06-13 15:20:38 -04:00
parent 57cb44dbeb
commit 2ef8774ac5
2 changed files with 9 additions and 7 deletions
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8
src/libextra/arc.rs
View File

@ -380,12 +380,12 @@ impl<T:Const + Owned> RWARC<T> {
* # Example
*
* ~~~ {.rust}
* do arc.write_downgrade |write_mode| {
* do (&write_mode).write_cond |state, condvar| {
* do arc.write_downgrade |mut write_token| {
* do write_token.write_cond |state, condvar| {
* ... exclusive access with mutable state ...
* }
* let read_mode = arc.downgrade(write_mode);
* do (&read_mode).read |state| {
* let read_token = arc.downgrade(write_token);
* do read_token.read |state| {
* ... shared access with immutable state ...
* }
* }

8
src/libextra/sync.rs
View File

@ -598,6 +598,8 @@ impl RWlock {
// solves this because T1 will hold order_lock while waiting on access,
// which will cause T3 to have to wait until T1 finishes its write,
// which can't happen until T2 finishes the downgrade-read entirely.
// The astute reader will also note that making waking writers use the
// order_lock is better for not starving readers.
unsafe {
do task::unkillable {
(&self.order_lock).acquire();
@ -622,12 +624,12 @@ impl RWlock {
* # Example
*
* ~~~ {.rust}
* do lock.write_downgrade |write_token| {
* do (&write_token).write_cond |condvar| {
* do lock.write_downgrade |mut write_token| {
* do write_token.write_cond |condvar| {
* ... exclusive access ...
* }
* let read_token = lock.downgrade(write_token);
* do (&read_token).read {
* do read_token.read {
* ... shared access ...
* }
* }