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Technical Support
On-Line Manuals
RL-ARM User's Guide (MDK v4)
RL-RTX
Overview
Product Description
Product Specification
Technical Data
Timing Specifications
Advantages
Your First RTX Application
Theory of Operation
Timer Tick Interrupt
System Task Manager
Task Management
Idle Task
System Resources
Scheduling Options
Pre-emptive Scheduling
Round-Robin Scheduling
Cooperative Multitasking
Priority Inversion
Stack Management
User Timers
Interrupt Functions
Configuring RL-RTX
Configuration Options
Tasks
Stack Size
Stack Checking
Run in Privileged Mode
Hardware Timer
Round-Robin Multitasking
User Timers
FIFO Queue Buffer
Idle Task
Error Function
Create New RTX_Config.c
Configuration Macros
Alternate Tick Timer
Low Power RTX
Library Files
Using RL-RTX
Writing Programs
Include Files
Defining Tasks
Multiple Instances
External References
Using a Mailbox
SWI Functions
SVC Functions
Debugging
System Info
Task Info
Event Viewer
Usage Hints
ARM7/ARM9 Version
Cortex-M Version
Create New RTX Application
Function Reference
Event Flag Management Routines
Mailbox Management Routines
Memory Allocation Routines
Mutex Management Routines
Semaphore Management Routines
System Functions
Task Management Routines
Time Management Routines
User Timer Management Routines
RL-FlashFS
RL-TCPnet
RL-CAN
RL-USB
Example Programs
Library Reference
Appendix
Stack Checking
It is possible that the stack is exhausted because of many nested subroutine calls or an extensive use of large automatic variables.
If Stack Checking is enabled, the kernel can detect the stack exhaustion problem and execute the system error function. The application will hang in an endless loop inside the error function with parameter err_code set to OS_ERR_STK_OVF. You can identify the task id with isr_tsk_get() function. Check the Active Tasks debug dialog for the task name.
The solution to this problem is to increase the stack size for all tasks in the configuration file. If only one task requires a big stack and RAM is limited, you can create this task with a user-provided stack space.
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OS_STKCHECK enables the Stack Checking algorithm. It must
be set to 1 to enable it or 0 to disable it. It is
enabled by default.
#define OS_STKCHECK 1
Note
- Enabled Stack Checking slightly decreases the kernel performance because on every task switch the kernel needs to execute additional code for stack checking.
- On stack overflow a runtime system error function is called.
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