All rights reserved. Click here to view a static menu. Mutexes cannot be used in interrupt service routines. If a mutex is created using xSemaphoreCreateMutexStatic then the RAM is provided by the application writer, which requires an additional parameter, but allows the RAM to be statically allocated at compile time. See the Static Vs Dynamic allocation page for more information.
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All rights reserved. Click here to view a static menu. Mutexes cannot be used in interrupt service routines. If a mutex is created using xSemaphoreCreateMutexStatic then the RAM is provided by the application writer, which requires an additional parameter, but allows the RAM to be statically allocated at compile time. See the Static Vs Dynamic allocation page for more information. Mutexes are taken using xSemaphoreTake , and given using xSemaphoreGive.
Mutexes and binary semaphores are very similar but have some subtle differences: Mutexes include a priority inheritance mechanism, binary semaphores do not. This makes binary semaphores the better choice for implementing synchronisation between tasks or between tasks and an interrupt , and mutexes the better choice for implementing simple mutual exclusion. An example of a mutex being used to implement mutual exclusion is provided on the xSemaphoreTake documentation page.
Note that the same functionality can be achieved in a more efficient way using a direct to task notification. If the mutex type semaphore was created successfully then a handle to the created mutex is returned.
If the mutex was not created because the memory required to hold the mutex could not be allocated then NULL is returned.
Semaphore / Mutexes
Macro that implements a semaphore by using the existing queue mechanism. The queue length is 1 as this is a binary semaphore. The data size is 0 as we don't want to actually store any data - we just want to know if the queue is empty or full. This type of semaphore can be used for pure synchronisation between tasks or between an interrupt and a task. For this reason this type of semaphore does not use a priority inheritance mechanism.
How to use mutex and semaphores in a FreeRTOS and SDK2.0 Project
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