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   vTaskSuspendAll [RTOS Kernel Control] task. h void vTaskSuspendAll( void ); Suspends the scheduler without disabling interrupts. Context switches will not occur while the scheduler is suspended. RTOS ticks that occur while the scheduler is suspended will be held pending until the scheduler has been unsuspended using a call to xTaskResumeAll(). API functions that have the potential to cause a context switch (for example, vTaskDelayUntil(), xQueueSend(), etc.) must not be called while the scheduler is suspended. Example usage: void vTask1( void * pvParameters ) { for( ;; ) { // Task code goes here. // ... // At some point the task wants to perform a long operation during // which it does not want to get swapped out. It cannot use // taskENTER_CRITICAL ()/taskEXIT_CRITICAL () as the length of the // operation may cause interrupts to be missed - including the // ticks. // Prevent the RTOS kernel swapping out the task. vTaskSuspendAll (); // Perform the operation here. There is no need to use critical // sections as we have all the microcontroller processing time. // During this time interrupts will still operate and the RTOS kernel // tick count will be maintained. // ... // The operation is complete. Restart the RTOS kernel. xTaskResumeAll (); } } [ 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