diff --git a/Practice_06/raceCondition.c b/Practice_06/raceCondition.c
new file mode 100644
index 0000000..0696cb2
--- /dev/null
+++ b/Practice_06/raceCondition.c
@@ -0,0 +1,26 @@
+#include <stdio.h>
+#include <pthread.h>
+
+int counter = 0;    //공유변수
+
+void* increment(void* arg){
+    for(int i = 0; i < 10000000; i++){
+        counter++;
+    }
+
+    return NULL;
+}
+
+int main(){
+    pthread_t t1, t2;
+
+    pthread_create(&t1, NULL, increment, NULL);
+    pthread_create(&t2, NULL, increment, NULL);
+
+    pthread_join(t1, NULL);
+    pthread_join(t2, NULL);
+
+    printf("Counter : %d\n", counter);
+
+    return 0;
+}
\ No newline at end of file