CMSIS-RTOS2: Definitions

| CMSIS-RTOS2 Version 2.1.3 Real-Time Operating System: API and RTX Reference Implementation

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Definitions
CMSIS-RTOS API v2

Constants and enumerations used by many CMSIS-RTOS functions. More...

## Content

| Flags Functions Error Codes
| Constants used by Thread Flags and Event Flags to return error codes.

## Macros

#define | osWaitForever 0xFFFFFFFFU
| Wait forever timeout value. More...
#define | osFlagsWaitAny 0x00000000U
| Wait for any flag (default). More...
#define | osFlagsWaitAll 0x00000001U
| Wait for all flags. More...
#define | osFlagsNoClear 0x00000002U
| Do not clear flags which have been specified to wait for. More...

## Enumerations

enum | osStatus_t { osOK = 0, osError = -1, osErrorTimeout = -2, osErrorResource = -3, osErrorParameter = -4, osErrorNoMemory = -5, osErrorISR = -6, osStatusReserved = 0x7FFFFFFF }
| Status code values returned by CMSIS-RTOS functions. More...

## Description

The following constants and enumerations are used by many CMSIS-RTOS function calls.

## Macro Definition Documentation

#define osWaitForever 0xFFFFFFFFU

A special Timeout Value that informs the RTOS to wait infinite until a resource becomes available. It applies to the following functions:

- osDelay : Wait for Timeout (Time Delay).
- osThreadFlagsWait : Wait for one or more Thread Flags of the current running thread to become signaled.
- osEventFlagsWait : Wait for one or more Event Flags to become signaled.
- osMutexAcquire : Acquire a Mutex or timeout if it is locked.
- osSemaphoreAcquire : Acquire a Semaphore token or timeout if no tokens are available.
- osMemoryPoolAlloc : Allocate a memory block from a Memory Pool.
- osMessageQueuePut : Put a Message into a Queue or timeout if Queue is full.
- osMessageQueueGet : Get a Message from a Queue or timeout if Queue is empty.

#define osFlagsWaitAny 0x00000000U

Reference:

- osEventFlagsWait
- osThreadFlagsWait

#define osFlagsWaitAll 0x00000001U

Reference:

- osEventFlagsWait
- osThreadFlagsWait

#define osFlagsNoClear 0x00000002U

Reference:

- osEventFlagsWait
- osThreadFlagsWait

## Enumeration Type Documentation

enum osStatus_t

The osStatus_t enumeration defines the event status and error codes that are returned by many CMSIS-RTOS functions.

Enumerator
osOK | Operation completed successfully.
osError | Unspecified RTOS error: run-time error but no other error message fits.
osErrorTimeout | Operation not completed within the timeout period.
osErrorResource | Resource not available.
osErrorParameter | Parameter error.
osErrorNoMemory | System is out of memory: it was impossible to allocate or reserve memory for the operation.
osErrorISR | Not allowed in ISR context: the function cannot be called from interrupt service routines.
osStatusReserved | Prevents enum down-size compiler optimization.