chap4

bac2/os/chap4/ex4.c

@@ -0,0 +1,34 @@
+#include <pthread.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+#define SIZE 32768
+
+pthread_t child_thread;
+pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
+
+int table[SIZE];
+
+int cmp(const void* a1, const void* a2){
+	return *((int*)a2) - *((int*)a1);
+}
+
+void* child(void* args){
+	pthread_mutex_lock(&mutex);
+	for (int i = 0; i < SIZE; ++i) {
+		table[i] = rand();
+	}
+	pthread_mutex_unlock(&mutex);
+	sleep(1);
+	pthread_mutex_lock(&mutex);
+	return NULL;
+}
+
+int main(void)
+{
+	pthread_create(&child_thread, NULL, child, NULL);
+
+	pthread_mutex_lock(&mutex);
+	qsort(table, SIZE, sizeof(int), cmp);
+	pthread_mutex_unlock(&mutex);
+}