完成了第 18 章 多线程服务器端的实现

ch18/semaphore.c

@@ -0,0 +1,52 @@
+#include <stdio.h>
+#include <pthread.h>
+#include <semaphore.h>
+
+void *read(void *arg);
+void *accu(void *arg);
+static sem_t sem_one;
+static sem_t sem_two;
+static int num;
+
+int main(int argc, char const *argv[])
+{
+    pthread_t id_t1, id_t2;
+    sem_init(&sem_one, 0, 0);
+    sem_init(&sem_two, 0, 1);
+
+    pthread_create(&id_t1, NULL, read, NULL);
+    pthread_create(&id_t2, NULL, accu, NULL);
+
+    pthread_join(id_t1, NULL);
+    pthread_join(id_t2, NULL);
+
+    sem_destroy(&sem_one);
+    sem_destroy(&sem_two);
+    return 0;
+}
+
+void *read(void *arg)
+{
+    int i;
+    for (i = 0; i < 5; i++)
+    {
+        fputs("Input num: ", stdout);
+
+        sem_wait(&sem_two);
+        scanf("%d", &num);
+        sem_post(&sem_one);
+    }
+    return NULL;
+}
+void *accu(void *arg)
+{
+    int sum = 0, i;
+    for (i = 0; i < 5; i++)
+    {
+        sem_wait(&sem_one);
+        sum += num;
+        sem_post(&sem_two);
+    }
+    printf("Result: %d \n", sum);
+    return NULL;
+}