Is it necessary to ensure the thread-safety when writing a device driver?

[Sebastian Huber]

Hi,
many BSPs use the termios framework for the console driver.  This
framework takes care about concurrent access.  For a particular simple
console driver see in the ARM BSP lpc24xx.

PowerMan wrote:
>        I am writing a uart driver and this uart is used as
> the console of my board.
>       Is it necessary to do some protection in function like that
> 
> int uart_write(const char *buf, int len)
> {
> int i;
> for (i = 0; i < len; i++)
>    TX_Regsiter = buf[i];
> }
> 
> I worried about that if one thread called printf("abc") and another
> called printf("def") then I would got "adbecf".
> 
> I noticed that the uart driver of some arm board do nothing to it.
> Does the protection is made by the new-lib?
> 
> If so, I should only use standard library to access the console,
> never directly access the uart_write, right?
> 
> 
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-- 
Sebastian Huber, Embedded Brains GmbH

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