View source for FreeRTOS

FreeRTOS is an open source real time operating system commonly used in embedded development.

==Task notifications==
Rather than using semaphores for wakeup, task notifications are faster and less heavyweight.

==Mutexes==
FreeRTOS mutexes are a special class of semaphores. Note that they cannot be taken in interrupt handlers (i.e. <tt>xSemaphoreTakeFromISR()</tt> should only be used on semaphores created using <tt>xSemaphoreCreateBinary()</tt>). Using <tt>xSemaphoreTakeFromISR()</tt> on a mutex-type semaphore will generally fail if the lock is already held. Relative to a binary semaphore, mutexes have a priority inheritance mechanism.