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content/posts/rust-concurrency.md

@@ -261,8 +261,12 @@ impl AtomicI32 {
 } 
 
 
- // std::sync::Once and std::sync::OnceLock 
-
+// std::sync::Once and std::sync::OnceLock
+// A cell which can be written to only once
+pub struct OnceCell<T> { /* private fields */ }
+// thread-safe OnceCell, can be used in statics.
+// 用get_or_init获取值
+pub struct OnceLock<T>
 
 // Fetch-and-Modify Operations
 // could overflow compared to CAS