P296 18.3 线程存在的问题和临界区

ch18/thread3.c

@@ -0,0 +1,30 @@
+#include <stdio.h>
+#include <pthread.h>
+void *thread_summation(void *arg);
+int sum = 0;
+
+int main(int argc, char *argv[])
+{
+    pthread_t id_t1, id_t2;
+    int range1[] = {1, 5};
+    int range2[] = {6, 10};
+
+    pthread_create(&id_t1, NULL, thread_summation, (void *)range1);
+    pthread_create(&id_t2, NULL, thread_summation, (void *)range2);
+
+    pthread_join(id_t1, NULL);
+    pthread_join(id_t2, NULL);
+    printf("result: %d \n", sum);
+    return 0;
+}
+void *thread_summation(void *arg)
+{
+    int start = ((int *)arg)[0];
+    int end = ((int *)arg)[1];
+    while (start <= end)
+    {
+        sum += start;
+        start++;
+    }
+    return NULL;
+}