diff --git a/08_14_mutex/1.mytwothread.c b/08_14_mutex/1.mytwothread.c
new file mode 100644
index 0000000000000000000000000000000000000000..5f5f3521779cdf4fe394c9854a4261b1b952921a
--- /dev/null
+++ b/08_14_mutex/1.mytwothread.c
@@ -0,0 +1,62 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <pthread.h>
+
+void * thread_function(void *);
+
+int Counter=0;
+
+int main(void)
+{
+ pthread_t tid1, tid2;
+ void *thread_result;
+
+ if(pthread_create(&tid1, NULL, thread_function, "thread1")!=0) {
+ perror("pthread_create");
+ exit(1);
+ }
+ if(pthread_create(&tid2, NULL, thread_function, "thread2")!=0) {
+ perror("pthread_create");
+ exit(1);
+ }
+
+ if(pthread_join(tid1, &thread_result)!=0) {
+ perror("pthread_join");
+ exit(1);
+ }
+ if(pthread_join(tid2, &thread_result)!=0) {
+ perror("pthread_join");
+ exit(1);
+ }
+
+ printf(" thread result : %s\n", (char *) thread_result);
+ return 0;
+}
+
+void * thread_function(void * arg)
+{
+ int temp;
+ int i, j;
+ char buffer[80];
+
+ printf("thread_function called\n");
+ for(i=0; i<20; i++) {
+ sprintf(buffer, "%s : Counter : from %d to ", (char*)arg, Counter); //sprintf : 배열에 찍는것
+ write(1, buffer, strlen(buffer));
+
+ temp=Counter;
+ temp = temp+1;
+
+// delay
+ for(j=0; j<500000; j++);
+
+ Counter=temp;
+
+ sprintf(buffer, " %d\n", Counter);
+ write(1, buffer, strlen(buffer));
+
+ }
+ pthread_exit("thread end");
+}
diff --git a/08_14_mutex/2.mymutexthread_st.c b/08_14_mutex/2.mymutexthread_st.c
new file mode 100644
index 0000000000000000000000000000000000000000..c1c2143419b6e611fd99087077ea713365c52d8c
--- /dev/null
+++ b/08_14_mutex/2.mymutexthread_st.c
@@ -0,0 +1,87 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <pthread.h>
+#include <sys/types.h>
+#include <errno.h>
+
+#include <unistd.h>
+#include <sys/syscall.h>
+
+void * thread_function(void *);
+
+int Counter=0;
+#ifndef NOMUTEX
+pthread_mutex_t mutex_id;
+#endif
+
+int main(void)
+{
+ pthread_t tid1, tid2;
+ void *thread_result;
+
+#ifndef NOMUTEX
+ if(pthread_mutex_init(&mutex_id, NULL) != 0){
+ perror("pthread_mutex_init");
+ exit(errno);
+ }
+#endif
+
+ if(pthread_create(&tid1, NULL, thread_function, "thread1")!=0) {
+ perror("pthread_create");
+ exit(1);
+ }
+
+ if(pthread_create(&tid2, NULL, thread_function, "thread2")!=0) {
+ perror("pthread_create");
+ exit(1);
+ }
+
+ if(pthread_join(tid1, &thread_result)!=0) {
+ perror("pthread_join");
+ exit(1);
+ }
+ if(pthread_join(tid2, &thread_result)!=0) {
+ perror("pthread_join");
+ exit(1);
+ }
+
+#ifndef NOMUTEX
+ pthread_mutex_lock(&mutex_id);
+#endif
+
+ printf(" thread result : %s\n", (char *) thread_result);
+ return 0;
+}
+
+void * thread_function(void * arg)
+{
+ int temp;
+ int i, j;
+ char buffer[80];
+
+ printf("thread_function called\n");
+ for(i=0; i<8; i++) {
+#ifndef NOMUTEX
+ pthread_mutex_lock(&mutex_id);
+#endif
+ sprintf(buffer, "%s: CountRelay: from %d to ", (char*)arg, Counter);
+ write(1, buffer, strlen(buffer));
+
+ temp=Counter;
+ temp = temp+1;
+// delay
+ for(j=0; j<5000000; j++);
+
+ Counter=temp;
+
+ sprintf(buffer, "%d\n", Counter);
+ write(1, buffer, strlen(buffer));
+
+#ifndef NOMUTEX
+ pthread_mutex_unlock(&mutex_id);
+#endif
+ }
+ // getchar();
+ pthread_exit("thread end");
+}
diff --git a/08_14_mutex/ledThreads/Makefile b/08_14_mutex/ledThreads/Makefile
new file mode 100644
index 0000000000000000000000000000000000000000..6e9dcdc6ec2d07a1072f54db87cc3eb905ac761a
--- /dev/null
+++ b/08_14_mutex/ledThreads/Makefile
@@ -0,0 +1,17 @@
+SRCS := led_main.c led_green.c led_yellow.c
+OBJS := $(SRCS:.c=.o)
+CC := gcc
+#컴파일 옵션
+CFLAGS = -Wall -g
+#linking 옵션
+LDFLAGS = -lpthread -lwiringPi
+
+led_main : $(OBJS)
+ $(CC) -o $@ $^ ${LDFLAGS}
+
+# dummy target
+clean :
+ -rm $(OBJS)
+ -rm led_main
+dep :
+ gccmakedep ${SRCS}
\ No newline at end of file
diff --git a/08_14_mutex/ledThreads/led.h b/08_14_mutex/ledThreads/led.h
new file mode 100644
index 0000000000000000000000000000000000000000..9782bedb1cb157b902813db4a098e14cd3a8961d
--- /dev/null
+++ b/08_14_mutex/ledThreads/led.h
@@ -0,0 +1,12 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <wiringPi.h>
+#include <pthread.h>
+
+#define LED_RED 1
+#define LED_GREEN 4
+#define LED_YELLOW 5
+
+void* led_yellow_task(void* args);
+void* led_green_task(void* args);
\ No newline at end of file
diff --git a/08_14_mutex/ledThreads/led_green.c b/08_14_mutex/ledThreads/led_green.c
new file mode 100644
index 0000000000000000000000000000000000000000..6a7cbd54a12973abbe3f7caa954da4e3e2d4be5e
--- /dev/null
+++ b/08_14_mutex/ledThreads/led_green.c
@@ -0,0 +1,17 @@
+#include "led.h"
+
+void * led_green_task(void *arg)
+{
+ int i;
+ pinMode(LED_GREEN, OUTPUT);
+
+ for(i=0; i<(int)arg; i++) {
+ digitalWrite(LED_GREEN, HIGH);
+ printf("GREEN ON!\n");
+ sleep(2);
+ digitalWrite(LED_GREEN, LOW);
+ printf("GREEN OFF!\n");
+ sleep(2);
+ }
+ pthread_exit(arg);
+}
\ No newline at end of file
diff --git a/08_14_mutex/ledThreads/led_main b/08_14_mutex/ledThreads/led_main
new file mode 100644
index 0000000000000000000000000000000000000000..a33595168cd6a255657d4aefce298c7589060022
Binary files /dev/null and b/08_14_mutex/ledThreads/led_main differ
diff --git a/08_14_mutex/ledThreads/led_main.c b/08_14_mutex/ledThreads/led_main.c
new file mode 100644
index 0000000000000000000000000000000000000000..26fbdc92dbf5b451d9d34afd0167402d9f499af7
--- /dev/null
+++ b/08_14_mutex/ledThreads/led_main.c
@@ -0,0 +1,67 @@
+#include "led.h"
+
+void led_red_task()
+{
+ pinMode(LED_RED, OUTPUT);
+
+ for(int i=0; i<10; i++) {
+ digitalWrite(LED_RED, HIGH);
+ printf("RED ON!\n");
+ sleep(1);
+ digitalWrite(LED_RED, LOW);
+ printf("RED OFF!\n");
+ sleep(1);
+ }
+}
+
+int main(int argc, char *argv[])
+{
+ int gno;
+ int count;
+ pthread_t tid_Y, tid_G;
+
+ if(argc < 2) {
+ wiringPiSetup();
+ led_red_task();
+ }
+ else{
+ gno = atoi(argv[1]);
+ count = atoi(argv[2]);
+
+ wiringPiSetup();
+
+ if (gno == 1) {
+ led_red_task();
+ if (pthread_create(&tid_G, NULL, led_green_task, (void*)count) != 0)
+ {
+ perror("pthread_create");
+ exit(1);
+ }
+ } else if (gno == 2) {
+ led_red_task();
+ if (pthread_create(&tid_Y, NULL, led_yellow_task, (void*)count) != 0)
+ {
+ perror("pthread_create");
+ exit(1);
+ }
+ } else if(gno == 3){
+ led_red_task();
+ if (pthread_create(&tid_Y, NULL, led_yellow_task, (void*)count) != 0)
+ {
+ perror("pthread_create");
+ exit(1);
+ }
+ if (pthread_create(&tid_G, NULL, led_green_task, (void*)count) != 0)
+ {
+ perror("pthread_create");
+ exit(1);
+ }
+ }
+ }
+ pthread_exit(NULL);
+ return 0;
+}
+
+
+
+
diff --git a/08_14_mutex/ledThreads/led_yellow.c b/08_14_mutex/ledThreads/led_yellow.c
new file mode 100644
index 0000000000000000000000000000000000000000..c87ba7104bd02ff9c7d8ee0bd801a048013f96bb
--- /dev/null
+++ b/08_14_mutex/ledThreads/led_yellow.c
@@ -0,0 +1,18 @@
+#include "led.h"
+
+void * led_yellow_task(void *arg)
+{
+ int i;
+ pinMode(LED_YELLOW, OUTPUT);
+
+ for(i=0; i<(int)arg; i++) {
+ digitalWrite(LED_YELLOW, HIGH);
+ printf("YELLOW ON!\n");
+ sleep(3);
+ digitalWrite(LED_YELLOW, LOW);
+ printf("YELLOW OFF!\n");
+ sleep(3);
+ }
+ pthread_exit(arg);
+
+}
\ No newline at end of file