diff options
Diffstat (limited to 'cpukit/posix/src/clocknanosleep.c')
| -rw-r--r-- | cpukit/posix/src/clocknanosleep.c | 153 |
1 files changed, 153 insertions, 0 deletions
diff --git a/cpukit/posix/src/clocknanosleep.c b/cpukit/posix/src/clocknanosleep.c new file mode 100644 index 0000000000..43f15346de --- /dev/null +++ b/cpukit/posix/src/clocknanosleep.c @@ -0,0 +1,153 @@ +/* SPDX-License-Identifier: BSD-2-Clause */ + +/** + * @file + * + * @ingroup POSIXAPI + * + * @brief Suspends Execution of calling thread until Time elapses + */ + +/* + * COPYRIGHT (c) 1989-2015. + * On-Line Applications Research Corporation (OAR). + * + * Copyright (c) 2016. Gedare Bloom. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" + * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE + * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR + * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF + * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS + * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN + * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + */ + +#ifdef HAVE_CONFIG_H +#include "config.h" +#endif + +#include <time.h> + +#include <rtems/score/threadimpl.h> +#include <rtems/score/threadqimpl.h> +#include <rtems/score/timespec.h> +#include <rtems/score/timecounter.h> +#include <rtems/score/watchdogimpl.h> +#include <rtems/posix/posixapi.h> + +static Thread_queue_Control _Nanosleep_Pseudo_queue = + THREAD_QUEUE_INITIALIZER( "Nanosleep" ); + +/* + * High Resolution Sleep with Specifiable Clock, IEEE Std 1003.1, 2001 + */ +int clock_nanosleep( + clockid_t clock_id, + int flags, + const struct timespec *rqtp, + struct timespec *rmtp +) +{ + Thread_queue_Context queue_context; + bool absolute; + Thread_Control *executing; + int eno; + + if ( clock_id != CLOCK_REALTIME && clock_id != CLOCK_MONOTONIC ) { + return ENOTSUP; + } + + _Thread_queue_Context_initialize( &queue_context ); + _Thread_queue_Context_set_thread_state( + &queue_context, + STATES_WAITING_FOR_TIME | STATES_INTERRUPTIBLE_BY_SIGNAL + ); + + if ( ( flags & TIMER_ABSTIME ) != 0 ) { + absolute = true; + rmtp = NULL; + } else { + absolute = false; + + /* + * A relative CLOCK_REALTIME time out shall not be affected by + * CLOCK_REALTIME changes through clock_settime(). Since our + * CLOCK_REALTIME is basically just CLOCK_MONOTONIC plus an offset, we can + * simply use the CLOCK_MONOTONIC watchdog for relative CLOCK_REALTIME time + * outs. + */ + clock_id = CLOCK_MONOTONIC; + } + + if ( clock_id == CLOCK_REALTIME ) { + _Thread_queue_Context_set_enqueue_timeout_realtime_timespec( + &queue_context, + rqtp, + absolute + ); + } else { + _Thread_queue_Context_set_enqueue_timeout_monotonic_timespec( + &queue_context, + rqtp, + absolute + ); + } + + _Thread_queue_Acquire( &_Nanosleep_Pseudo_queue, &queue_context ); + executing = _Thread_Executing; + _Thread_queue_Enqueue( + &_Nanosleep_Pseudo_queue.Queue, + &_Thread_queue_Operations_FIFO, + executing, + &queue_context + ); + eno = _POSIX_Get_error_after_wait( executing ); + + if ( eno == ETIMEDOUT ) { + eno = 0; + } + + if ( rmtp != NULL ) { +#if defined( RTEMS_POSIX_API ) + if ( eno == EINTR ) { + struct timespec actual_end; + struct timespec planned_end; + + _Assert( clock_id == CLOCK_MONOTONIC ); + _Timecounter_Nanouptime( &actual_end ); + + _Watchdog_Ticks_to_timespec( + executing->Timer.Watchdog.expire, + &planned_end + ); + + if ( _Timespec_Less_than( &actual_end, &planned_end ) ) { + _Timespec_Subtract( &actual_end, &planned_end, rmtp ); + } else { + _Timespec_Set_to_zero( rmtp ); + } + } else { + _Timespec_Set_to_zero( rmtp ); + } +#else + _Assert( eno != EINTR ); + _Timespec_Set_to_zero( rmtp ); +#endif + } + + return eno; +} |