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notes/计算机操作系统.md
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@@ -270,7 +270,7 @@ down 和 up 操作需要被设计成原语，不可分割，通常的做法是
```c
typedef int semaphore ;
samaphore mutex = 1;
semaphore mutex = 1;
void P1() {
down(mutex);
// 临界区