RTOS/TI-RTOS-PROC: TaskSelf() and fdOpenSession(TaskSelf())

Surya Paruchuri

Part Number: TI-RTOS-PROC

Tool/software: TI-RTOS

Hello,

I am currently going through a large RTOS based code base. And I stumbled up on a question. Is

1. fdOpenSession(TaskSelf()) ---> What does this function do? Is it used to spinoff a task at the startup...? (The User guide isn't clear on this or may be I am too tired after going through the code ).

2. TaskSelf() ---> if the above one is used to spinoff a task at the startup then what would this function do differently ...?

Thanks for answering the questions in advance.

over 7 years ago

0 ToddMullanix over 7 years ago

TI__Guru* 96960 points

Hi Surya,

Each task needs some memory to store file descriptors. The fdOpenSession allocates a block of memory and places it into the Task env via Task_setHookContext. A semaphore is part of the file descriptor table also. It does not spin another task off.

TaskSelf just returns the task handle. The task handle is needed to access that task's env.

Todd

0 Surya Paruchuri over 7 years ago in reply to ToddMullanix

Intellectual 650 points

Thanks Todd for the explanation.

0 Surya Paruchuri over 7 years ago in reply to ToddMullanix

Intellectual 650 points

@ToddMullanix But which file does the descriptor point to..? Because there is no file operation going on in the Task other than a network interface ..? The file in which the Task code is in..? or the network interface task file ...?

0 ToddMullanix over 7 years ago in reply to Surya Paruchuri

TI__Guru* 96960 points

Here's the structure that is allocated. This used internally in the NDK.

/* File Descriptor Table */

typedef struct _fdtable {

uint Type; /* Set to HTYPE_FDTABLE */

uint RefCount; /* Object reference count */

HANDLE hSem; /* File Event semaphore */

int error; /* FileOp Error Number */

UINT8 fClosing; /* Flag when tasks can not use sockets */

UINT8 fEvented; /* Flag if we were "evented" */

UINT8 fAbortPoll; /* Flag if fdSelectAbort() called */

} FDTABLE;

0 Surya Paruchuri over 7 years ago in reply to ToddMullanix

Intellectual 650 points

Thank you ToddMullanix

Processors

Processors forum

RTOS/TI-RTOS-PROC: TaskSelf() and fdOpenSession(TaskSelf())