The FreeRTOS kernel is now an MIT licensed AWS open source project, and these pages are being updated accordingly.

Quality RTOS & Embedded Software About   Contact   Support   FAQ   Download Menu      Quick Start Supported MCUs PDF Books Trace Tools Ecosystem Quick Start Guide Support Forum ⇓ Download Source ⇓ FreeRTOS+ Ecosystem  FreeRTOS+TCP:  Thread safe TCP/IP stack  SafeRTOS:  TUV certified RTOS  OpenRTOS:  Commercial Licensed RTOS  Fail Safe File System:  Ensures data integrity  FreeRTOS BSPs:  3rd party driver packages  Trace & Visualisation:  Tracealyzer for FreeRTOS  CLI:  Command line interface  WolfSSL SSL / TLS:  Networking security protocols  RTOS Training:  Delivered online or on-site  IO:  read(), write(), ioctl() interface FreeRTOS+ Lab Projects  FreeRTOS+POSIX:  POSIX threading API  FreeRTOS+FAT:  Thread aware file system Hint: Use the tree menu to navigate groups of related pages   Queue Management [API] Modules xQueueCreate xQueueCreateStatic vQueueDelete xQueueSend xQueueSendFromISR xQueueSendToBack xQueueSendToBackFromISR xQueueSendToFront xQueueSendToFrontFromISR xQueueReceive xQueueReceiveFromISR uxQueueMessagesWaiting uxQueueMessagesWaitingFromISR uxQueueSpacesAvailable xQueueReset xQueuePeek xQueuePeekFromISR vQueueAddToRegistry pcQueueGetName vQueueUnregisterQueue xQueueIsQueueEmptyFromISR xQueueIsQueueFullFromISR xQueueOverwrite xQueueOverwriteFromISR Detailed Description uxQueueMessagesWaiting queue.h UBaseType_t uxQueueMessagesWaiting( QueueHandle_t xQueue ); Return the number of messages stored in a queue. Parameters: xQueue   A handle to the queue being queried. Returns: The number of messages available in the queue. uxQueueMessagesWaitingFromISR queue.h UBaseType_t uxQueueMessagesWaiting( QueueHandle_t xQueue ); A version of uxQueueMessagesWaiting() that can be called from an ISR. Return the number of messages stored in a queue. Parameters: xQueue   A handle to the queue being queried. Returns: The number of messages available in the queue. uxQueueSpacesAvailable queue.h UBaseType_t uxQueueSpacesAvailable( QueueHandle_t xQueue ); Return the number of free spaces in a queue. Parameters: xQueue   A handle to the queue being queried. Returns: The number of free spaces available in the queue. vQueueDelete queue.h void vQueueDelete( QueueHandle_t xQueue ); Delete a queue - freeing all the memory allocated for storing of items placed on the queue. Parameters: xQueue   A handle to the queue to be deleted. xQueueReset queue.h BaseType_t xQueueReset( QueueHandle_t xQueue ); Resets a queue to its original empty state. Parameters: xQueue   The handle of the queue being reset Returns: Since FreeRTOS V7.2.0 xQueueReset() always returns pdPASS. xQueueIsQueueEmptyFromISR queue.h BaseType_t xQueueIsQueueEmptyFromISR( const QueueHandle_t xQueue ); Queries a queue to determine if the queue is empty. This function should only be used in an ISR. Parameters: xQueue   The handle of the queue being queried Returns: pdFALSE if the queue is not empty, or any other value if the queue is empty. xQueueIsQueueFullFromISR queue.h BaseType_t xQueueIsQueueFullFromISR( const QueueHandle_t xQueue ); Queries a queue to determine if the queue is full. This function should only be used in an ISR. Parameters: xQueue   The handle of the queue being queried Returns: pdFALSE if the queue is not full, or any other value if the queue is full. [ Back to the top ]    [ About FreeRTOS ]    [ Privacy ]    [ Sitemap ]    [ ] Copyright (C) Amazon Web Services, Inc. or its affiliates. All rights reserved.

Latest News NXP tweet showing LPC5500 (ARMv8-M Cortex-M33) running FreeRTOS. Meet Richard Barry and learn about running FreeRTOS on RISC-V at FOSDEM 2019 Version 10.1.1 of the FreeRTOS kernel is available for immediate download. MIT licensed. View a recording of the "OTA Update Security and Reliability" webinar, presented by TI and AWS. Careers FreeRTOS and other embedded software careers at AWS. FreeRTOS Partners