int sched_yield( void )
{
_Thread_Disable_dispatch();
_Thread_Yield( _Thread_Executing );
_Thread_Enable_dispatch();
return 0;
}
rtems_status_code rtems_task_wake_after(
rtems_interval ticks
)
{
/*
* It is critical to obtain the executing thread after thread dispatching is
* disabled on SMP configurations.
*/
Thread_Control *executing;
Per_CPU_Control *cpu_self;
cpu_self = _Thread_Dispatch_disable();
executing = _Thread_Executing;
if ( ticks == 0 ) {
_Thread_Yield( executing );
} else {
_Thread_Set_state( executing, STATES_DELAYING );
_Thread_Wait_flags_set( executing, THREAD_WAIT_STATE_BLOCKED );
_Watchdog_Initialize(
&executing->Timer,
_Thread_Timeout,
0,
executing
);
_Watchdog_Insert_ticks( &executing->Timer, ticks );
}
_Thread_Dispatch_enable( cpu_self );
return RTEMS_SUCCESSFUL;
}
int sched_yield( void )
{
Per_CPU_Control *cpu_self;
cpu_self = _Thread_Dispatch_disable();
_Thread_Yield( _Per_CPU_Get_executing( cpu_self ) );
_Thread_Dispatch_direct( cpu_self );
return 0;
}
/*
* 14.2.5 High Resolution Sleep, P1003.1b-1993, p. 269
*/
int nanosleep(
const struct timespec *rqtp,
struct timespec *rmtp
)
{
/*
* It is critical to obtain the executing thread after thread dispatching is
* disabled on SMP configurations.
*/
Thread_Control *executing;
Watchdog_Interval ticks;
Watchdog_Interval elapsed;
/*
* Return EINVAL if the delay interval is negative.
*
* NOTE: This behavior is beyond the POSIX specification.
* FSU and GNU/Linux pthreads shares this behavior.
*/
if ( !_Timespec_Is_valid( rqtp ) )
rtems_set_errno_and_return_minus_one( EINVAL );
/*
* Convert the timespec delay into the appropriate number of clock ticks.
*/
ticks = _Timespec_To_ticks( rqtp );
/*
* A nanosleep for zero time is implemented as a yield.
* This behavior is also beyond the POSIX specification but is
* consistent with the RTEMS API and yields desirable behavior.
*/
if ( !ticks ) {
_Thread_Disable_dispatch();
executing = _Thread_Executing;
_Thread_Yield( executing );
_Thread_Enable_dispatch();
if ( rmtp ) {
rmtp->tv_sec = 0;
rmtp->tv_nsec = 0;
}
return 0;
}
/*
* Block for the desired amount of time
*/
_Thread_Disable_dispatch();
executing = _Thread_Executing;
_Thread_Set_state(
executing,
STATES_DELAYING | STATES_INTERRUPTIBLE_BY_SIGNAL
);
_Watchdog_Initialize(
&executing->Timer,
_Thread_Delay_ended,
0,
executing
);
_Watchdog_Insert_ticks( &executing->Timer, ticks );
_Thread_Enable_dispatch();
/*
* Calculate the time that passed while we were sleeping and how
* much remains from what we requested.
*/
elapsed = executing->Timer.stop_time - executing->Timer.start_time;
if ( elapsed >= ticks )
ticks = 0;
else
ticks -= elapsed;
/*
* If the user wants the time remaining, do the conversion.
*/
if ( rmtp ) {
_Timespec_From_ticks( ticks, rmtp );
}
/*
* Only when POSIX is enabled, can a sleep be interrupted.
*/
#if defined(RTEMS_POSIX_API)
/*
* If there is time remaining, then we were interrupted by a signal.
*/
if ( ticks )
rtems_set_errno_and_return_minus_one( EINTR );
#endif
return 0;
}
