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CyC2018 2018-03-03 16:02:18 +08:00
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notes/计算机操作系统.md
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@ -269,7 +269,11 @@ down 和 up 操作需要被设计成原语，不可分割，通常的做法是
如果信号量的取值只能为 0 或者 1，那么就成为了**互斥量（Mutex）**，0 表示临界区已经加锁，1 表示临界区解锁。 如果信号量的取值只能为 0 或者 1，那么就成为了**互斥量（Mutex）**，0 表示临界区已经加锁，1 表示临界区解锁。
```c ```c
<<<<<<< HEAD
typedef int semaphore ; typedef int semaphore ;
=======
typedef int semaphore;
>>>>>>> bedf25d3f0312d8e38953d742d42dbf87585980e
semaphore mutex = 1; semaphore mutex = 1;
void P1() { void P1() {
down(mutex); down(mutex);
@ -292,7 +296,11 @@ void P2() {
```c ```c
#define N 100 #define N 100
<<<<<<< HEAD
typedef int semaphore ; typedef int semaphore ;
=======
typedef int semaphore;
>>>>>>> bedf25d3f0312d8e38953d742d42dbf87585980e
semaphore mutex = 1; semaphore mutex = 1;
semaphore empty = N; semaphore empty = N;
semaphore full = 0; semaphore full = 0;