Compiler/66AK2H14: Multi-threading in CCS

mahima shanbag

Expert 1585 points

Part Number: 66AK2H14
Other Parts Discussed in Thread: 66AK2H12, SYSBIOS,

Tool/software: TI C/C++ Compiler

Hi,

I am using CCS7.4.

I am trying to use both the hyperlink ports[Hyplnk0 and Hyplnk1] at once as in this post.

I thought of creating two threads and configuring each port though the threads.

I referred this wiki for creating threads .

1. one thread is created successfully but for second thread it was giving ENOMEM error.

How to solve this error?

2.I commented the second thread and tried with only one thread.

I was getting error for pthread_join as

EINVAL – pthread_join() was called on a thread that another thread has already called pthread_join() on the thread.

Please help me to solve these errors.

Regards,

Mahima Shanbag

over 5 years ago

0 mahima shanbag over 5 years ago

Expert 1585 points

Hi,
This is how I created threads in my application.
int main(void)
{
// , *dataBufPtr_1;
Board_initCfg boardCfg;
int threadArg = 1;
pthread_attr_t attr;
boardCfg = BOARD_INIT_PINMUX_CONFIG |
BOARD_INIT_MODULE_CLOCK |
BOARD_INIT_UART_STDIO;
Board_init(boardCfg);

pthread_attr_init(&attr);
pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_JOINABLE);
if(pthread_create(&port0_thread, &attr , (ThreadFxn)hyplnk_port0, (void *)threadArg))
{
UART_printf("Error creating thread\n");
return 1;

}
if(pthread_create(&port1_thread, &attr,(ThreadFxn) hyplnk_port1 ,(void *)threadArg))
{
UART_printf("Error creating thread\n");
return 1;
}

pthread_join(port0_thread,NULL);
pthread_join(port1_thread,NULL);
return 0;

}
Please help me to solve this issue.

Regards,
Mahima Shanbag

0 lding over 5 years ago in reply to mahima shanbag

TI__Guru* 95265 points

Hi,

I wonder if this issue is generic to thread creation or particular to hyperlink. In another word, if you replace thread function hyplnk_port0() and hyplnk_port1() with something simple like "hello world", do you still error?

Regards, Eric

0 mahima shanbag over 5 years ago in reply to lding

Expert 1585 points

Hi Eric,
I replaced hyplnk_port0() and hyplnk_port1() with hello world, but still the result was same.
I was not able to create 2 threads.

I tried the same in hello_66AK2H12_C66XX project, here I was able to create two threads.
But for pthread_join I was getting below assertion:
ti.sysbios.knl.Semaphore: line 202: assertion failure: A_badContext: bad calling context. Must be called from a Task.

Please help me to solve this.
Regards
Mahima Shanbag

0 ToddMullanix over 5 years ago in reply to mahima shanbag

TI__Guru* 96960 points

Mihima,

For the thread creation issue, can you confirm what size of heap you have? Look in Tools->ROV->HeapMem to see the size and current free space. I expect the heap is too small and when the create tries to allocate stack space, it gives the error. Note: you can supply the stack to avoid the allocation in the create.

To increase the RTOS' heap, adjust the following in the .cfg accordingly.
BIOS.heapSize = 65536;

(I'm assuming you are not doing the HeapMem.primaryHeapBaseAddr, etc. trick in the .cfg file. If you are, increase the HEAPSIZE constant in your linker file).

Todd

0 mahima shanbag over 5 years ago in reply to ToddMullanix

Expert 1585 points

Hi Todd,
Thank you for your support.
Now I am able to create 2 threads in Hyplnk application But for pthread_join still I am getting below assertion:
ti.sysbios.knl.Semaphore: line 202: assertion failure: A_badContext: bad calling context. Must be called from a Task.

Please help me to solve this.

Regards,
Mahima Shanbag

0 ToddMullanix over 5 years ago in reply to mahima shanbag

TI__Guru* 96960 points

Hi Mahima,

You are calling a Semaphore_pend from a Swi or Hwi with a non-zero timeout and the semaphore is not available. The easiest way to find this is to open a disassembly window and enter "xdc_runtime_Error_raiseX__E" into the window. Then set a breakpoint at the beginning of the function. Run the app and when the breakpoint is hit, look at the Debug callstack.

Todd

0 mahima shanbag over 5 years ago in reply to ToddMullanix

Expert 1585 points

Hi Todd,

I looked into the debug call stack , I didnt see any SWI and HWI thread calling Semaphore_pend().

I have attached the screenshot here.

Thanks and Regards,

Mahima Shanbag

0 ToddMullanix over 5 years ago in reply to mahima shanbag

TI__Guru* 96960 points

Hi Mahima,

You cannot call pthread_join from main()

Please look at this page for more details: processors.wiki.ti.com/.../BIOS_POSIX_Thread_(pthread)_Support . Specifically at
"For example, pthread_create() can be called from main(), but pthread_join() cannot. " and the "Summary of Pthread APIs supported in SYS/BIOS" near the end of the page.

Todd

0 mahima shanbag over 5 years ago in reply to ToddMullanix

Expert 1585 points

Hi Todd,
Whether SMP(symmetric multiprocessing) is supported in 66AK2H14.
Because When I create two threads , those threads were not running simultaneously.
In my project I have to make both the threads work simultaneously.
Please help me with this.

Thanks and Regards,
Mahima Shanbag

0 ToddMullanix over 5 years ago in reply to mahima shanbag

TI__Guru* 96960 points

This looks like a new question. Can you please open a new thread for this?

Todd

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Compiler/66AK2H14: Multi-threading in CCS