update atomic.h and add .gitignore

.gitignore

@@ -0,0 +1,3 @@
+*~
+obj/
+bin/

code/lab5/libs/atomic.h

@@ -53,5 +53,29 @@ test_bit(int nr, volatile void *addr) {
     return oldbit != 0;
 }
 
+/* *
+ * test_and_set_bit - Atomically set a bit and return its old value
+ * @nr:     the bit to set
+ * @addr:   the address to count from
+ * */
+static inline bool
+test_and_set_bit(int nr, volatile void *addr) {
+    int oldbit;
+    asm volatile ("btsl %2, %1; sbbl %0, %0" : "=r" (oldbit), "=m" (*(volatile long *)addr) : "Ir" (nr) : "memory");
+    return oldbit != 0;
+}
+
+/* *
+ * test_and_clear_bit - Atomically clear a bit and return its old value
+ * @nr:     the bit to clear
+ * @addr:   the address to count from
+ * */
+static inline bool
+test_and_clear_bit(int nr, volatile void *addr) {
+    int oldbit;
+    asm volatile ("btrl %2, %1; sbbl %0, %0" : "=r" (oldbit), "=m" (*(volatile long *)addr) : "Ir" (nr) : "memory");
+    return oldbit != 0;
+}
+
 #endif /* !__LIBS_ATOMIC_H__ */