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[RTOS Message Buffer API]
BaseType_t xMessageBufferIsEmpty( MessageBufferHandle_t xMessageBuffer );
Queries a message buffer to see if it is empty. A message buffer is empty if it does not contain any messages.
Message buffer functionality is enabled by including the FreeRTOS/source/stream_buffer.c source file in the build (as message buffers use stream buffers).
xMessageBuffer The handle of the message buffer being queried.
- If the message buffer is empty then pdTRUE is returned. Otherwise pdFALSE is returned.