thread

0812/Makefile

+CC = gcc
+OBJS = thread.o
+
+test: $(OBJS)
+	$(CC) -o $@ -lpthread $^
+	
+thread.o: thread.c
+	$(CC) -c $^
+	
+clean:
+	rm $(OBJS) test

0812/input_scores

+75
+70
+73
+97
+47
+12
+33
+62
+81
+21
+4
+7
+27
+79
+34
+13
+38
+16
+29
+43
+14
+87
+28
+45
+71
+65
+89
+57
+93
+67
\ No newline at end of file

0812/thread.c

+#include <stdio.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <pthread.h>
+
+short scores[30];
+
+void *sthread1(void *arg)
+{
+	printf("sthread1 start!\n");
+	short sum = 0, i;
+	float avg;
+	
+	for (i = 0; i < 30; i++)
+	{
+		sum += scores[i];
+	}
+	avg = (float)sum / 30;
+	
+	printf("Sum : %hd, Average : %f\n", sum, avg);
+	printf("sthread1 end!\n");
+	pthread_exit(arg);
+}
+
+void *sthread2(void *arg)
+{
+	printf("sthread2 start!\n");
+	short i, j, temp;
+	
+	for (i = 0; i < 29; i++)
+	{
+		for (j = 0; j < 29 - i; j++)
+		{
+			if (scores[j] < scores[j + 1])
+			{
+				temp = scores[j];
+				scores[j] = scores[j + 1];
+				scores[j + 1] = temp;
+			}
+		}
+	}
+	
+	printf("Sorted scores\n");
+	for (i = 0; i < 30; i++)
+	{
+		printf("%2hd ", scores[i]);
+		if (i % 10 == 9)
+		{
+			printf("\n");
+		}
+	}
+	printf("sthread2 end!\n");
+	pthread_exit(arg);
+}
+
+int main()
+{
+	printf("Main thread start!\n");
+	pthread_t tid1, tid2;
+	int status1, status2, i;
+	
+	for (i = 0; i < 30; i++)
+	{
+		scanf("%hd", &scores[i]);
+	}
+	
+	status1 = pthread_create(&tid1, NULL, sthread1, (void*)scores);
+	if (status1 != 0)
+	{
+		perror("thread1 create");
+		exit(1);
+	}
+	
+	status2 = pthread_create(&tid2, NULL, sthread2, (void*)scores);
+	if (status2 != 0)
+	{
+		perror("thread2 create");
+		exit(1);
+	}
+
+	printf("Main thread end!\n");
+	pthread_exit(NULL);
+	return 0;
+}