This utility gives a finer grain to wait for smaller amount of time. This is useful for waiting the delay between each frequency change.
Signed-off-by: Daniel Lezcano daniel.lezcano@linaro.org --- utils/nanosleep.c | 55 +++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 files changed, 55 insertions(+), 0 deletions(-) create mode 100644 utils/nanosleep.c
diff --git a/utils/nanosleep.c b/utils/nanosleep.c new file mode 100644 index 0000000..f366e53 --- /dev/null +++ b/utils/nanosleep.c @@ -0,0 +1,55 @@ +/******************************************************************************* + * PM-QA validation test suite for the power management on ARM + * + * Copyright (C) 2011, Linaro Limited. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version 2 + * of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. + * + * Contributors: + * Daniel Lezcano daniel.lezcano@linaro.org (IBM Corporation) + * - initial API and implementation + * + *******************************************************************************/ +#include <stdio.h> +#include <stdlib.h> +#include <errno.h> +#include <time.h> + +int main(int argc, char *argv[]) +{ + struct timespec req = { 0 }, rem = { 0 }; + + if (argc != 2) { + fprintf(stderr, "%s <nanoseconds>\n", argv[0]); + return 1; + } + + req.tv_nsec = atoi(argv[1]); + + for (;;) { + if (!nanosleep(&req, &rem)) + break; + + if (errno == EINTR) { + req = rem; + continue; + } + + perror("failed to nanosleep"); + return 1; + } + + return 0; +}