edison_multithread_blink.ino

#include <unistd.h>
#include <pthread.h>

#define LED1 13
#define LED2 12
#define LED3 11

pthread_t th[3];
pthread_mutex_t mutex;  // Mutex

void mutex_digitalWrite(uint8_t pin, uint8_t val)
{
    pthread_mutex_lock( &mutex );
    digitalWrite(pin, val);
    pthread_mutex_unlock( &mutex );
}

void *thread1(void *thdata)
{
  while(1){
    mutex_digitalWrite(LED1, HIGH);
    usleep( 500000 );
    mutex_digitalWrite(LED1, LOW);
    usleep( 500000 );
  }
}
void *thread2(void *thdata)
{
  while(1){
    mutex_digitalWrite(LED2, HIGH);
    usleep( 250000 );
    mutex_digitalWrite(LED2, LOW);
    usleep( 250000 );
  }
}

void *thread3(void *thdata)
{
  while(1){
    mutex_digitalWrite(LED3, HIGH);
    usleep( 125000 );
    mutex_digitalWrite(LED3, LOW);
    usleep( 125000 );
  }
}

void setup() {
  pinMode(LED1, OUTPUT);
  pinMode(LED2, OUTPUT);
  pinMode(LED3, OUTPUT);
  pthread_mutex_init( &mutex, NULL );
  pthread_create( &th[0], NULL, thread1, (void *)NULL );
  pthread_create( &th[1], NULL, thread2, (void *)NULL );
  pthread_create( &th[2], NULL, thread3, (void *)NULL );
}

void loop() {
  delay(5000);
}