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[/] [openrisc/] [trunk/] [rtos/] [rtems/] [c/] [src/] [exec/] [posix/] [src/] [nanosleep.c] - Rev 532
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/* * $Id: nanosleep.c,v 1.2 2001-09-27 11:59:17 chris Exp $ */ #include <assert.h> #include <time.h> #include <errno.h> #include <rtems/system.h> #include <rtems/score/isr.h> #include <rtems/score/thread.h> #include <rtems/score/tod.h> #include <rtems/posix/seterr.h> #include <rtems/posix/time.h> /*PAGE * * 14.2.5 High Resolution Sleep, P1003.1b-1993, p. 269 */ int nanosleep( const struct timespec *rqtp, struct timespec *rmtp ) { Watchdog_Interval ticks; struct timespec *the_rqtp; if ( !rqtp ) set_errno_and_return_minus_one( EINVAL ); the_rqtp = (struct timespec *)rqtp; /* * Return EAGAIN if the delay interval is negative. * * NOTE: This behavior is beyond the POSIX specification. * FSU pthreads shares this behavior. */ if ( the_rqtp->tv_sec < 0 ) the_rqtp->tv_sec = 0; if ( /* the_rqtp->tv_sec < 0 || */ the_rqtp->tv_nsec < 0 ) set_errno_and_return_minus_one( EAGAIN ); if ( the_rqtp->tv_nsec >= TOD_NANOSECONDS_PER_SECOND ) set_errno_and_return_minus_one( EINVAL ); ticks = _POSIX_Timespec_to_interval( the_rqtp ); /* * This behavior is also beyond the POSIX specification but is * consistent with the RTEMS api and yields desirable behavior. */ if ( !ticks ) { _Thread_Disable_dispatch(); _Thread_Yield_processor(); _Thread_Enable_dispatch(); if ( rmtp ) { rmtp->tv_sec = 0; rmtp->tv_nsec = 0; } return 0; } _Thread_Disable_dispatch(); _Thread_Set_state( _Thread_Executing, STATES_DELAYING | STATES_INTERRUPTIBLE_BY_SIGNAL ); _Watchdog_Initialize( &_Thread_Executing->Timer, _Thread_Delay_ended, _Thread_Executing->Object.id, NULL ); _Watchdog_Insert_ticks( &_Thread_Executing->Timer, ticks ); _Thread_Enable_dispatch(); /* calculate time remaining */ if ( rmtp ) { ticks -= _Thread_Executing->Timer.stop_time - _Thread_Executing->Timer.start_time; _POSIX_Interval_to_timespec( ticks, rmtp ); /* * If there is time remaining, then we were interrupted by a signal. */ if ( ticks ) set_errno_and_return_minus_one( EINTR ); } return 0; }
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