Quellcode-Bibliothek alarmtimer-suspend.c
Sprache: C
/* alarmtimer suspend test * John Stultz (john.stultz@linaro.org) * (C) Copyright Linaro 2013 * Licensed under the GPLv2 * * This test makes sure the alarmtimer & RTC wakeup code is * functioning. * * To build: * $ gcc alarmtimer-suspend.c -o alarmtimer-suspend -lrt * * 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.
*/
#define UNREASONABLE_LAT (NSEC_PER_SEC * 5) /* hopefully we resume in 5 secs */
#define SUSPEND_SECS 15 int alarmcount; int alarm_clock_id; struct timespec start_time;
char *clockstring(int clockid)
{ switch (clockid) { case CLOCK_REALTIME: return"CLOCK_REALTIME"; case CLOCK_MONOTONIC: return"CLOCK_MONOTONIC"; case CLOCK_PROCESS_CPUTIME_ID: return"CLOCK_PROCESS_CPUTIME_ID"; case CLOCK_THREAD_CPUTIME_ID: return"CLOCK_THREAD_CPUTIME_ID"; case CLOCK_MONOTONIC_RAW: return"CLOCK_MONOTONIC_RAW"; case CLOCK_REALTIME_COARSE: return"CLOCK_REALTIME_COARSE"; case CLOCK_MONOTONIC_COARSE: return"CLOCK_MONOTONIC_COARSE"; case CLOCK_BOOTTIME: return"CLOCK_BOOTTIME"; case CLOCK_REALTIME_ALARM: return"CLOCK_REALTIME_ALARM"; case CLOCK_BOOTTIME_ALARM: return"CLOCK_BOOTTIME_ALARM"; case CLOCK_TAI: return"CLOCK_TAI";
} return"UNKNOWN_CLOCKID";
}
longlong timespec_sub(struct timespec a, struct timespec b)
{ longlong ret = NSEC_PER_SEC * b.tv_sec + b.tv_nsec;
ret -= NSEC_PER_SEC * a.tv_sec + a.tv_nsec; return ret;
}
clock_gettime(alarm_clock_id, &start_time);
printf("Start time (%s): %ld:%ld\n", clockstring(alarm_clock_id),
start_time.tv_sec, start_time.tv_nsec);
printf("Setting alarm for every %i seconds\n", SUSPEND_SECS);
its1.it_value = start_time;
its1.it_value.tv_sec += SUSPEND_SECS;
its1.it_interval.tv_sec = SUSPEND_SECS;
its1.it_interval.tv_nsec = 0;
timer_settime(tm1, TIMER_ABSTIME, &its1, &its2);
while (alarmcount < 5)
sleep(1); /* First 5 alarms, do nothing */
printf("Starting suspend loops\n"); while (alarmcount < 10) { int ret;
sleep(3);
ret = system("echo mem > /sys/power/state"); if (ret) break;
}
timer_delete(tm1);
} if (final_ret)
ksft_exit_fail();
ksft_exit_pass();
}
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