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RL-ARM User's Guide
RL-RTX Overview Product Description
Basic Functions Interprocess Communications Product Specification Technical Data Timing Specifications How To Use Your First RTX Application Theory of Operation Timer Tick Interrupt System Clock Task Task Management Idle Task System Resources Cooperative Multitasking Round-Robin Multitasking Preemptive Multitasking Priority Inversion Stack Management User Timers Interrupt Functions Configuring RTX Kernel Basic RTX Configuration Tasks Stack Size Stack Checking Run in Priviliged Mode Hardware Timer Round-Robin Multitasking Idle Task User Timers Advanced RTX Configuration HW Resources Required Configuration Macros Library Files Using RTX Kernel Writing Programs Include Files Defining Tasks Multiple Instances External References Using a Mailbox SWI Functions SVC Functions Debugging Active Tasks System Info Usage Hints ARM Version Cortex Version Create New RTX Application Traffic Example Function Overview 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 Example Programs Library Reference AppendixStack 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 os_stk_overflow() stack error function. The application will hang in an endless loop inside the stack error function. The variable task_id will contain the task ID of the task with the stack problem. You can 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.
- 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
- Enabled Stack Checking slightly decreases the kernel performance because on every task switch the kernel needs to execute additional code for stack checking.
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