CMSIS-RTOS2  Version 2.1.3
Real-Time Operating System: API and RTX Reference Implementation
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RTX5 functions. More...

Functions

uint32_t osRtxErrorNotify (uint32_t code, void *object_id)
 OS Error Callback function. More...
 
void osRtxIdleThread (void *argument)
 OS Idle Thread. More...
 

Description

Function Documentation

uint32_t osRtxErrorNotify ( uint32_t  code,
void *  object_id 
)
Parameters
[in]codeThe code to identify the error condition.
[in]object_idA reference to any RTX object to identify the object that caused the issue, can be NULL.

Some system error conditions can be detected during runtime. If the RTX kernel detects a runtime error, it calls the runtime error function osRtxErrorNotify for an object specified by parameter object_id.

The parameter code passes the actual error code to this function:

Error Code Description
osRtxErrorStackUnderflow Stack overflow detected for thread (thread_id=object_id)
osRtxErrorISRQueueOverflow ISR Queue overflow detected when inserting object (object_id)
osRtxErrorTimerQueueOverflow User Timer Callback Queue overflow detected for timer (timer_id=object_id)
osRtxErrorClibSpace Standard C/C++ library libspace not available: increase OS_THREAD_LIBSPACE_NUM
osRtxErrorClibMutex Standard C/C++ library mutex initialization failed

The function osRtxErrorNotify must contain an infinite loop to prevent further program execution. You can use an emulator to step over the infinite loop and trace into the code introducing a runtime error. For the overflow errors this means you need to increase the size of the object causing an overflow.

Code Example

#include "rtx_os.h"
uint32_t osRtxErrorNotify (uint32_t code, void *object_id) {
(void)object_id;
switch (code) {
// Stack overflow detected for thread (thread_id=object_id)
break;
// ISR Queue overflow detected when inserting object (object_id)
break;
// User Timer Callback Queue overflow detected for timer (timer_id=object_id)
break;
// Standard C/C++ library libspace not available: increase OS_THREAD_LIBSPACE_NUM
break;
// Standard C/C++ library mutex initialization failed
break;
default:
break;
}
for (;;) {}
//return 0U;
}
void osRtxIdleThread ( void *  argument)
Parameters
[in]argumentUnused parameter, always set to NULL.

The function osRtxIdleThread is executed by the RTX kernel when no other threads are ready to run.

By default, this thread is an empty end-less loop that does nothing. It only waits until another task becomes ready to run. You may change the code of the osRtxIdleThread function to put the CPU into a power-saving or idle mode, see Tick-less Low-Power Operation.

The default stack size for this thread is defined in the file RTX_Config.h. Refer to Thread Configuration.

Attention
The idle thread should never be blocked nor terminated! Do not call and do not return from this function when providing a user defined implementation.

Code Example

#include "rtx_os.h"
__NO_RETURN void osRtxIdleThread (void *argument) {
(void)argument;
for (;;) {}
}