diff options
Diffstat (limited to 'src/libstd/sync')
| -rw-r--r-- | src/libstd/sync/once.rs | 10 |
1 files changed, 4 insertions, 6 deletions
diff --git a/src/libstd/sync/once.rs b/src/libstd/sync/once.rs index 3abc260b458..f6cb8beae84 100644 --- a/src/libstd/sync/once.rs +++ b/src/libstd/sync/once.rs @@ -31,12 +31,10 @@ // initialization closure panics, the Once enters a "poisoned" state which means // that all future calls will immediately panic as well. // -// So to implement this, one might first reach for a `StaticMutex`, but those -// unfortunately need to be deallocated (e.g. call `destroy()`) to free memory -// on all OSes (some of the BSDs allocate memory for mutexes). It also gets a -// lot harder with poisoning to figure out when the mutex needs to be -// deallocated because it's not after the closure finishes, but after the first -// successful closure finishes. +// So to implement this, one might first reach for a `Mutex`, but those cannot +// be put into a `static`. It also gets a lot harder with poisoning to figure +// out when the mutex needs to be deallocated because it's not after the closure +// finishes, but after the first successful closure finishes. // // All in all, this is instead implemented with atomics and lock-free // operations! Whee! Each `Once` has one word of atomic state, and this state is |