RTOS/TM4C1294NCPDT: Dynamic task_create issue

Balasubramani C

Expert 1685 points

Part Number: TM4C1294NCPDT
Other Parts Discussed in Thread: SYSBIOS

Tool/software: TI-RTOS

Hi,

i am using the following version for my application development.

CCS - 6.2

TI RTOS - tirtos_tivac_2_16_01_14

ndk - ndk_2_25_00_09

BIOS - bios_6_45_02_31

i want to create the task dynamically from another task using Task_create() API. but its returning NULL and task is not been created. find the below code used to create the task.

Task_Handle userPgmHandle;
Task_Params userPgmParams;

Task_Params_init(&userPgmParams);
userPgmParams.stackSize = 2048;
userPgmParams.priority = 5;
userPgmHandle =
Task_create((Task_FuncPtr)UserFunc, &userPgmParams, &eb);
if (userPgmHandle == NULL) {
System_printf("User Program Start failed\n");
}

but the same code is creating the task when its added in tcpHandlerHook function.

i also added the follwoing code to CFG file.

/* Allow for run-time creates/memory allocation */
var Defaults = xdc.useModule('xdc.runtime.Defaults');
var Types = xdc.useModule('xdc.runtime.Types');
Defaults.common$.memoryPolicy = Types.CREATE_POLICY;
BIOS.runtimeCreatesEnabled = true;

if i added the above code to cfg file then i am getting the following error while running..

ti.sysbios.knl.Semaphore: delete policy error

xdc.runtime.Error.raise: terminating execution

what is missed here?

Regards

Bala

over 6 years ago

0 Balasubramani C over 6 years ago

Expert 1685 points

i also used Task_construct to create the task dynamically but didnt workout.

Task_Params_init(&userPgmParams);
userPgmParams.stackSize = 2048;
userPgmParams.priority = 5;
userPgmParams.stack = &userPgmStack;
Task_construct(&userPgmStruct, (Task_FuncPtr)UserFunc, &userPgmParams, &eb);

Regards
Bala

0 ToddMullanix over 6 years ago in reply to Balasubramani C

TI__Guru* 96960 points

Hi Bala,

What is the size of your heap and how much is free when you try to create the task? You can look at Tools->ROV->HeapMem. I expect you do not have enough memory to allocate the Task_object and stack in the Task_create.

Note: using Types_CREATE_POLICY means that you are going to create objects, but not delete them. If we know this, we can optimize the kernel.

Todd

0 Balasubramani C over 6 years ago in reply to ToddMullanix

Expert 1685 points

Hi Todd,

I have increased heap memory and stack but its not working out. please find the snapshot of ROV->heap. After task_create() fail, still it has free memory of more than 20Kbytes.

My application is still continue to run except this task_create() fails.

Regards

Bala

0 ToddMullanix over 6 years ago in reply to Balasubramani C

TI__Guru* 96960 points

Hi Bali,

Do you have a sample program that reproduces the problem? If so, can you export it and attach it to this thread?

Todd

0 Balasubramani C over 6 years ago in reply to ToddMullanix

Expert 1685 points

Hi Todd,

here i have experimented using default hello world example project and this is also not working for me.

there is static task i.e. task0fxn created in cfg file and from that task i am trying to create dynamic task i.e. .

i have attached the code here. please check and suggest the solution.

Regards

Bala

hello_world.zip

0 ToddMullanix over 6 years ago in reply to Balasubramani C

TI__Guru* 96960 points

Hi Bala,

Thanks. The problem is that the Error_Block was not initialized. You need to add the following before you pass it into Task_create.
Error_init(&eb);

Since the eb was uninitialized, the contents are "random". Internally the eb is checked in a couple places in the create call. It looked like there was a problem when there was not.

The heap was cutting it close also. printf in gcc allocates memory.

Todd

0 Balasubramani C over 6 years ago in reply to ToddMullanix

Expert 1685 points

HI Todd,

Thank you. Now i will be able to create/delete the task dynamically.

Regards
Bala

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RTOS/TM4C1294NCPDT: Dynamic task_create issue