Initial commit

app.c

+#include <stdio.h>
+#include <pthread.h>
+#include <unistd.h>
+#include <stdlib.h>
+
+// http://www.digipine.com/index.php?mid=clan&document_srl=584
+
+#define TRUE 1
+#define FALSE 0
+
+#define THRESHOLD_ULTRASONIC_COMING	1234
+#define TERM_COMING	1
+
+int isPedestrianComing = 0;
+
+void *t_function(void *data){
+	int buf1 = 0;
+	int buf2 = 0;
+	int buf3 = 0;
+	
+	// ultrasonic.read(&buf1);
+	sleep(TERM_COMING);
+	// ultrasonic.read(&buf2);
+	sleep(TERM_COMING);
+	while(TRUE){
+		// ultrasonic.read(&buf3);
+		if(buf3 > THRESHOLD_ULTRASONIC_COMING
+			&& buf2 - buf1 > 0
+			&& buf3 - buf2 > 0){
+				isPedestrianComing = TRUE;
+				printf("true\n");
+		}
+		else{
+				isPedestrianComing = FALSE;
+				printf("false\n");
+		}
+		sleep(TERM_COMING);
+		
+		// ultrasonic.read(&buf1);
+		if(buf1 > THRESHOLD_ULTRASONIC_COMING
+			&& buf3 - buf2 > 0
+			&& buf1 - buf3 > 0){
+				isPedestrianComing = TRUE;
+				printf("true\n");
+		}
+		else{
+				isPedestrianComing = FALSE;
+				printf("false\n");
+		}
+		sleep(TERM_COMING);
+		
+		// ultrasonic.read(&buf2);
+		if(buf2 > THRESHOLD_ULTRASONIC_COMING
+			&& buf1 - buf3 > 0
+			&& buf2 - buf1 > 0){
+				isPedestrianComing = TRUE;
+				printf("true\n");
+		}
+		else{
+				isPedestrianComing = FALSE;
+				printf("false\n");
+		}
+		sleep(TERM_COMING);
+	}
+}
+
+int main(void){
+	pthread_t incomeCheckThread;
+	int status;
+	
+	if(pthread_create(&incomeCheckThread, NULL, t_function, (void *)NULL) < 0){
+		perror("thread create error: ");
+		exit(0);
+	}
+	
+	while(1){
+		printf("main read: %d\n", isPedestrianComing);
+		sleep(1);
+	}
+	
+	pthread_join(incomeCheckThread, (void *)&status);
+	printf("thread join : %d\n", status);
+	
+	return 0;
+}