CMSIS-RTOS API Version 2

Version	Description
V2.1.0	Updated configuration files: RTX_Config.h for the configuration settings and RTX_config.c for implementing the RTX5 Specific API. Support for critical and uncritical sections (nesting safe): updated: osKernelLock, osKernelUnlock added: osKernelRestoreLock Updated Thread Flags and Event Flags: changed flags parameter and return type from int32_t to uint32_t
V2.0.0	New API Version 2.0 available. See CMSIS-RTOS2 for a detailed function reference. See Migration from API v1 to API v2 for details on the migration process from API Version 1.
V1.02 - only documentation changes	Added: Overview of the CMSIS-RTOS Validation Software Pack. Clarified: Behavior of Timeout Value.
V1.02	Added: New control functions for short timeouts in microsecond resolution osKernelSysTick, osKernelSysTickFrequency, osKernelSysTickMicroSec. Removed: osSignalGet.
V1.01	Added capabilities for C++, kernel initialization and object deletion. Prepared for C++ class interface. In this context to const attribute has been moved from osXxxxDef_t typedefs to the osXxxxDef macros. Added: osTimerDelete, osMutexDelete, osSemaphoreDelete. Added: osKernelInitialize that prepares the kernel for object creation.
V1.00	First official Release. Added: osKernelStart; starting 'main' as a thread is now an optional feature. Semaphores have now the standard behavior. osTimerCreate does no longer start the timer. Added: osTimerStart (replaces osTimerRestart). Changed: osThreadPass is renamed to osThreadYield.
V0.02	Preview Release.

CMSIS-RTOS RTX Version 5

Version	Description
V5.1.0	Based on CMSIS-RTOS API V2.1. Added support for Event recording. Added support for IAR compiler. Configuration file split into .h and .c file. osRtx name-space for RTX specific symbols.
V5.0.0	Initial release compliant to CMSIS-RTOS2.