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   Semaphores [API]  TIP: 'Task Notifications' can provide a light weight alternative to semaphores in many situations  Modules xSemaphoreCreateBinary xSemaphoreCreateBinaryStatic vSemaphoreCreateBinary [use xSemaphoreCreateBinary() for new designs] xSemaphoreCreateCounting xSemaphoreCreateCountingStatic xSemaphoreCreateMutex xSemaphoreCreateMutexStatic xSemaphoreCreateRecursiveMutex xSemaphoreCreateRecursiveMutexStatic vSemaphoreDelete xSemaphoreGetMutexHolder xSemaphoreTake xSemaphoreTakeFromISR xSemaphoreTakeRecursive xSemaphoreGive xSemaphoreGiveRecursive xSemaphoreGiveFromISR uxSemaphoreGetCount vSemaphoreDelete semphr.h void vSemaphoreDelete( SemaphoreHandle_t xSemaphore ); Deletes a semaphore, including mutex type semaphores and recursive semaphores. Do not delete a semaphore that has tasks blocked on it (tasks that are in the Blocked state waiting for the semaphore to become available). Parameters: xSemaphore  The handle of the semaphore being deleted. [ Back to the top ]    [ About FreeRTOS ]    [ Privacy ]    [ Sitemap ]    [ ] Copyright (C) Amazon Web Services, Inc. or its affiliates. All rights reserved.

Latest News FreeRTOS v10.2.1 is available for immediate download. MIT licensed, includes 64-bit RISC-V, NXP Cortex-M33 demo, Nuvoton Cortex-M23 demo & STM32H745 dual core (AMP) demo. NXP tweet showing LPC5500 (ARMv8-M Cortex-M33) running FreeRTOS. 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