chap3

bac2/os/chap3/ex6.c

@@ -0,0 +1,44 @@
+#include <stdlib.h>
+#include <pthread.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <time.h>
+
+#define THREADS 9
+
+int cmp(const void * first, const void *second){
+	return (*(int*)first) - (*(int*)second);
+}
+
+void* threaded(){
+	int delay = rand() % 6;
+	int value = rand() % 256;
+	int *ret = malloc(sizeof(int));
+	*ret = value;
+	sleep(delay);
+	return ret;
+}
+
+int main(void)
+{
+	srand(time(NULL));
+	pthread_t threads[THREADS];
+	int returned[THREADS];
+	for (int i = 0; i < THREADS; ++i) {
+		pthread_create(threads+i, NULL, threaded, NULL);
+	}
+
+	int *ret= NULL;
+	for (int i = 0; i < THREADS; ++i) {
+		pthread_join(threads[i], (void*)&ret);
+		returned[i] = *ret;
+	}
+
+	qsort((void* ) returned, THREADS, sizeof(int), cmp);
+
+	for (int i = 0; i < THREADS; ++i) {
+		printf("%d\n", returned[i]);
+	}
+
+	return 0;
+}