[rtems commit] rtems: Update references to rtems_task_wake_after
Sebastian Huber
sebh at rtems.org
Thu Jul 20 09:09:33 UTC 2023
Module: rtems
Branch: master
Commit: 21429f681dfc94881b5d26763102c1e604889a24
Changeset: http://git.rtems.org/rtems/commit/?id=21429f681dfc94881b5d26763102c1e604889a24
Author: Kinsey Moore <kinsey.moore at oarcorp.com>
Date: Thu Jul 20 11:29:52 2023 +0200
rtems: Update references to rtems_task_wake_after
rtems_task_wake_after takes a parameter in terms of a count of clock
ticks and not a measure in a subunit of seconds. This updates
documentation to reflect that. This also makes obvious the caveat about
the first tick wait not being a whole tick and points the user at a
replacement for better accuracy.
Updates #4772
---
cpukit/include/rtems/rtems/tasks.h | 21 +++++++++++++--------
1 file changed, 13 insertions(+), 8 deletions(-)
diff --git a/cpukit/include/rtems/rtems/tasks.h b/cpukit/include/rtems/rtems/tasks.h
index 45be8a8730..7465c472f8 100644
--- a/cpukit/include/rtems/rtems/tasks.h
+++ b/cpukit/include/rtems/rtems/tasks.h
@@ -10,7 +10,7 @@
/*
* Copyright (C) 2020, 2021 embedded brains GmbH & Co. KG
- * Copyright (C) 1988, 2017 On-Line Applications Research Corporation (OAR)
+ * Copyright (C) 1988, 2023 On-Line Applications Research Corporation (OAR)
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
@@ -1544,15 +1544,16 @@ rtems_status_code rtems_task_mode(
/**
* @ingroup RTEMSAPIClassicTasks
*
- * @brief Wakes up after an interval in clock ticks or yields the processor.
+ * @brief Wakes up after a count of clock ticks have occurred or yields the
+ * processor.
*
- * @param ticks is the interval in clock ticks to delay the task or
+ * @param ticks is the count of clock ticks to delay the task or
* #RTEMS_YIELD_PROCESSOR to yield the processor.
*
- * This directive blocks the calling task for the specified ``ticks`` of clock
- * ticks if the value is not equal to #RTEMS_YIELD_PROCESSOR. When the
- * requested interval has elapsed, the task is made ready. The clock tick
- * directives automatically updates the delay period. The calling task may
+ * This directive blocks the calling task for the specified ``ticks`` count of
+ * clock ticks if the value is not equal to #RTEMS_YIELD_PROCESSOR. When the
+ * requested count of ticks have occurred, the task is made ready. The clock
+ * tick directives automatically update the delay period. The calling task may
* give up the processor and remain in the ready state by specifying a value of
* #RTEMS_YIELD_PROCESSOR in ``ticks``.
*
@@ -1561,7 +1562,11 @@ rtems_status_code rtems_task_mode(
* @par Notes
* Setting the system date and time with the rtems_clock_set() directive and
* similar directives which set CLOCK_REALTIME have no effect on a
- * rtems_task_wake_after() blocked task.
+ * rtems_task_wake_after() blocked task. The delay until first clock tick will
+ * never be a whole clock tick interval since this directive will never excute
+ * exactly on a clock tick. Applications requiring use of a clock
+ * (CLOCK_REALTIME or CLOCK_MONOTONIC) instead of clock ticks should make use
+ * of clock_nanosleep().
*
* @par Constraints
* @parblock
More information about the vc
mailing list