minix/lib/utils/tick_delay.c

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2005-04-21 16:53:53 +02:00
#include "utils.h"
/*===========================================================================*
* tick_delay *
*===========================================================================*/
PUBLIC int tick_delay(ticks)
long ticks; /* number of ticks to wait */
{
message m;
int s;
if (ticks <= 0) return; /* check for robustness */
m.m_type = SYS_SYNCALRM; /* request a synchronous alarm */
m.ALRM_PROC_NR = SELF; /* SELF means this process nr */
m.ALRM_EXP_TIME = ticks; /* request message after ticks */
m.ALRM_ABS_TIME = 0; /* ticks are relative to now */
s = _taskcall(SYSTASK, SYS_SYNCALRM, &m);
if (OK == s) receive(HARDWARE,&m); /* await synchronous alarm */
return(s);
}