/*
- weather-spin.c (spinlock semaphores)
- Olamide Adabonyan / Philip Lechowicz
- o_mide@yahoo.com / phillech@aol.com
*/

void Wait(int *semaphore)
{
	asm(" sei");  /* Test and set is atomic */
	
	while((*semaphore)<=0)	/* disabled */
	{      
         asm(" cli\n"		/* disabled */
		     " nop\n"		/* enabled  */
             " sei");		/* enabled  */
	}           
     
	(*semaphore)--;			/* disabled */
    asm(" cli");			/* disabled */
}							/* enabled  */

void Signal(int *semaphore)
{
	asm(" sei");  /* increment is atomic */
	(*semaphore)++;
	asm(" cli");
}