Re: _REENT

[Artur Lipowski <LAL at pro dot onet dot pl>]

Jeff Johnston wrote:
> Raphael Derosso Pereira wrote:
>> -----BEGIN PGP SIGNED MESSAGE-----
>> Hash: SHA1
>>
>> I'm working with FreeRTOS and want to use _REENT, but I don't know how
>> to setup this in a multithread environment. Is there any function that
>> can be used to specify the current _REENT structure on context switch?
>>
>>
> All that is needed is to set the global variable: _impure_ptr to a new 
reentrancy structure you have previously
> initialized via the _REENT_INIT() macro.  See libc/reent/impure.c  You can do 
this manually in your
> thread switching logic or you can do the following:
...

Try this (it works for me):

typedef struct tskTaskControlBlock
{
...
    #if ( configUSE_NEWLIB_REENTRANT == 1 )
        struct _reent reent;
    #endif
} tskTCB;


void vTaskSwitchContext( void )
{
...
    #if ( configUSE_NEWLIB_REENTRANT == 1 )
        _impure_ptr = &(pxCurrentTCB->reent);
    #endif

    traceTASK_SWITCHED_IN();
    vWriteTraceToBuffer();
}


static void prvInitialiseTCBVariables( tskTCB *pxTCB, const signed portCHAR * 
const pcName, unsigned portBASE_TYPE uxPriority )
{
...
    #if ( configUSE_NEWLIB_REENTRANT == 1 )
        _REENT_INIT_PTR((&(pxTCB->reent)));
    #endif
}


Regards,
--
Artur Lipowski