Add note about using cells in the locks on the 'unsupported' platform.

rust-lang · Oct 13, 2020 · b26aa5d · b26aa5d
1 parent f1c3edb
commit b26aa5d
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diff --git a/library/std/src/sys/unsupported/mutex.rs b/library/std/src/sys/unsupported/mutex.rs
@@ -1,6 +1,7 @@
 use crate::cell::Cell;
 
 pub struct Mutex {
+    // This platform has no threads, so we can use a Cell here.
     locked: Cell<bool>,
 }
 

diff --git a/library/std/src/sys/unsupported/rwlock.rs b/library/std/src/sys/unsupported/rwlock.rs
@@ -1,6 +1,7 @@
 use crate::cell::Cell;
 
 pub struct RWLock {
+    // This platform has no threads, so we can use a Cell here.
     mode: Cell<isize>,
 }