Handler syntax with high level languages

What sort of syntax do C and similar 'high level' platforms have for dealing
with asynchronous structures like custom interrupt handlers? Could anyone
show me a code sample of, say, setting up an ISR that triggers on a timer?

bruce varley wrote:
> What sort of syntax do C and similar 'high level' platforms have for dealing
> with asynchronous structures like custom interrupt handlers? Could anyone
> show me a code sample of, say, setting up an ISR that triggers on a timer?
> 
> 

Highly compiler dependent- there's no official support for it at all in 
C. Most embedded compilers (and BC++ and stuff like that) have some kind 
of support, but it's notat all portable.

Here's a (stripped down) timer A CCR2 interrupt from mspgcc (for the 
MSP430) :

interrupt(TIMERA1_VECTOR) CCR12ISR (void)
{

// Timebase interrupt - 1ms

if( CCTL2 & CCIFG)
  {
  CCR2 += 6000;					// Set time for next IRQ
  CCTL2 &= ~CCIFG;				// Clear the interrupt
  ticks++;

// Do time interrupt stuff here....
// .......

  }
}

Paul Burke

bruce varley <bxvarley@weqstnet.com.au> wrote:
> What sort of syntax do C and similar 'high level' platforms have for dealing
> with asynchronous structures like custom interrupt handlers? 

C itself has no such syntax at all.  Individual compilers do it in
their own, individual ways.  Some add an "interrupt" keyword, others
use a #pragma that flags a given routine as an interrupt handler.

The only "native" way C supports interrupts would by the <signal.h>
mechanisms.  But the runtime would have to be tailored to map
interrupts to signal names, and provide interrupt handles written in
ASM that call the signal handlers, if any are registered.  Not exactly
impossible, but for some reason, nobody seems to be doing it that way.

-- 
Hans-Bernhard Broeker (broeker@physik.rwth-aachen.de)
Even if all the snow were burnt, ashes would remain.