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| author | Sebastian Huber <sebastian.huber@embedded-brains.de> | 2018-02-02 07:43:39 +0100 |
|---|---|---|
| committer | Sebastian Huber <sebastian.huber@embedded-brains.de> | 2018-02-02 07:48:49 +0100 |
| commit | 1e483a62ea30e49e9d63ffdd44b14ac4a15f4fe3 (patch) | |
| tree | 6723ca753d3a87922e7fc8877244b30df82ddedb | |
| parent | smpschedaffinity04: Fix configuration (diff) | |
| download | rtems-1e483a62ea30e49e9d63ffdd44b14ac4a15f4fe3.tar.bz2 | |
test: Add rtems_test_busy_cpu_usage()
| -rw-r--r-- | cpukit/include/rtems/test.h | 15 | ||||
| -rw-r--r-- | cpukit/libmisc/testsupport/testbusy.c | 19 |
2 files changed, 32 insertions, 2 deletions
diff --git a/cpukit/include/rtems/test.h b/cpukit/include/rtems/test.h index 3dbdb9e32e..fbe8acf909 100644 --- a/cpukit/include/rtems/test.h +++ b/cpukit/include/rtems/test.h @@ -1,5 +1,5 @@ /* - * Copyright (c) 2014, 2017 embedded brains GmbH. All rights reserved. + * Copyright (c) 2014, 2018 embedded brains GmbH. All rights reserved. * * embedded brains GmbH * Dornierstr. 4 @@ -290,6 +290,19 @@ void rtems_test_parallel( ); /** + * @brief Performs a busy loop for the specified seconds and nanoseconds based + * on the CPU usage of the executing thread. + * + * This function continuously reads the CPU usage of the executing thread. + * This operation may lead to a scheduler instance lock contention in SMP + * configurations. + * + * @param[in] seconds The busy seconds. + * @param[in] nanoseconds The busy nanoseconds. + */ +void rtems_test_busy_cpu_usage(time_t seconds, long nanoseconds); + +/** * @brief Performs a busy loop with the specified iteration count. * * This function is optimized to not perform memory accesses and should have a diff --git a/cpukit/libmisc/testsupport/testbusy.c b/cpukit/libmisc/testsupport/testbusy.c index 2d34a805dc..4cc8aa01fe 100644 --- a/cpukit/libmisc/testsupport/testbusy.c +++ b/cpukit/libmisc/testsupport/testbusy.c @@ -1,5 +1,5 @@ /* - * Copyright (c) 2014, 2017 embedded brains GmbH. All rights reserved. + * Copyright (c) 2014, 2018 embedded brains GmbH. All rights reserved. * * embedded brains GmbH * Dornierstr. 4 @@ -19,6 +19,7 @@ #include <rtems/test.h> #include <rtems.h> +#include <rtems/score/threadimpl.h> static uint_fast32_t estimate_busy_loop_maximum( void ) { @@ -105,3 +106,19 @@ uint_fast32_t rtems_test_get_one_tick_busy_count( void ) return m; } + +void rtems_test_busy_cpu_usage( time_t seconds, long nanoseconds ) +{ + Thread_Control *executing; + Timestamp_Control busy; + Timestamp_Control start; + Timestamp_Control now; + + executing = _Thread_Get_executing(); + _Thread_Get_CPU_time_used( executing, &start ); + _Timestamp_Set( &busy, seconds, nanoseconds ); + + do { + _Thread_Get_CPU_time_used( executing, &now ); + } while ( now - start < busy ); +} |