Suspending a thread also blocks I2C

[IvanR]

Hello,

I have a thread that is reading sensor data over I2C. When I suspend it I cant access I2C from another thread that's reading another I2C device. 

I tried isolating the I2C read function with mutex so only one device can access it at a time and when thread goes to sleep to release the mutex but it did not help.

Any ideas why?

Regards, 

[IvanR]

void suspendThreads(struct k_thread* notifThread, struct k_thread* gyroThread, struct k_thread* adcThread) {
  k_thread_suspend(notifThread);
  k_thread_suspend(gyroThread);
  adc_thread_pause = true;
  // Wait a short period to ensure the ADC thread has paused corectly
  k_sleep(K_MSEC(200));
  k_thread_suspend(adcThread);
  k_timer_stop(&notification_timer);
}

[Edvin]

I understand very little of this. None of the names from this list matches anything that you posted in the earlier snippets. Perhaps you can upload the entire application, and let me know what file and line number things stop working?

Best regards,

Edvin

[IvanR]

Solved it by using semaphore to pause the thread instead of suspending. 

    // Check if the thread should be paused
    if (k_sem_count_get(&gyro_thread_sem) == 1) {
      // Wait on the semaphore if a pause is requested
      k_sem_take(&gyro_thread_sem, K_FOREVER);
    }