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283 lines
6.5 KiB
283 lines
6.5 KiB
/* set_timer latency test |
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* John Stultz ([email protected]) |
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* (C) Copyright Linaro 2014 |
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* Licensed under the GPLv2 |
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* |
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* This test makes sure the set_timer api is correct |
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* |
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* To build: |
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* $ gcc set-timer-lat.c -o set-timer-lat -lrt |
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* |
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* This program is free software: you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License as published by |
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* the Free Software Foundation, either version 2 of the License, or |
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* (at your option) any later version. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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*/ |
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#include <errno.h> |
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#include <stdio.h> |
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#include <unistd.h> |
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#include <time.h> |
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#include <string.h> |
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#include <signal.h> |
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#include <stdlib.h> |
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#include <pthread.h> |
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#include "../kselftest.h" |
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#define CLOCK_REALTIME 0 |
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#define CLOCK_MONOTONIC 1 |
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#define CLOCK_PROCESS_CPUTIME_ID 2 |
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#define CLOCK_THREAD_CPUTIME_ID 3 |
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#define CLOCK_MONOTONIC_RAW 4 |
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#define CLOCK_REALTIME_COARSE 5 |
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#define CLOCK_MONOTONIC_COARSE 6 |
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#define CLOCK_BOOTTIME 7 |
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#define CLOCK_REALTIME_ALARM 8 |
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#define CLOCK_BOOTTIME_ALARM 9 |
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#define CLOCK_HWSPECIFIC 10 |
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#define CLOCK_TAI 11 |
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#define NR_CLOCKIDS 12 |
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#define NSEC_PER_SEC 1000000000ULL |
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#define UNRESONABLE_LATENCY 40000000 /* 40ms in nanosecs */ |
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#define TIMER_SECS 1 |
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int alarmcount; |
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int clock_id; |
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struct timespec start_time; |
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long long max_latency_ns; |
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int timer_fired_early; |
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char *clockstring(int clockid) |
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{ |
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switch (clockid) { |
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case CLOCK_REALTIME: |
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return "CLOCK_REALTIME"; |
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case CLOCK_MONOTONIC: |
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return "CLOCK_MONOTONIC"; |
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case CLOCK_PROCESS_CPUTIME_ID: |
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return "CLOCK_PROCESS_CPUTIME_ID"; |
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case CLOCK_THREAD_CPUTIME_ID: |
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return "CLOCK_THREAD_CPUTIME_ID"; |
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case CLOCK_MONOTONIC_RAW: |
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return "CLOCK_MONOTONIC_RAW"; |
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case CLOCK_REALTIME_COARSE: |
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return "CLOCK_REALTIME_COARSE"; |
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case CLOCK_MONOTONIC_COARSE: |
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return "CLOCK_MONOTONIC_COARSE"; |
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case CLOCK_BOOTTIME: |
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return "CLOCK_BOOTTIME"; |
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case CLOCK_REALTIME_ALARM: |
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return "CLOCK_REALTIME_ALARM"; |
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case CLOCK_BOOTTIME_ALARM: |
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return "CLOCK_BOOTTIME_ALARM"; |
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case CLOCK_TAI: |
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return "CLOCK_TAI"; |
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}; |
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return "UNKNOWN_CLOCKID"; |
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} |
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long long timespec_sub(struct timespec a, struct timespec b) |
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{ |
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long long ret = NSEC_PER_SEC * b.tv_sec + b.tv_nsec; |
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ret -= NSEC_PER_SEC * a.tv_sec + a.tv_nsec; |
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return ret; |
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} |
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void sigalarm(int signo) |
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{ |
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long long delta_ns; |
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struct timespec ts; |
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clock_gettime(clock_id, &ts); |
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alarmcount++; |
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delta_ns = timespec_sub(start_time, ts); |
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delta_ns -= NSEC_PER_SEC * TIMER_SECS * alarmcount; |
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if (delta_ns < 0) |
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timer_fired_early = 1; |
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if (delta_ns > max_latency_ns) |
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max_latency_ns = delta_ns; |
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} |
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void describe_timer(int flags, int interval) |
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{ |
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printf("%-22s %s %s ", |
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clockstring(clock_id), |
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flags ? "ABSTIME":"RELTIME", |
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interval ? "PERIODIC":"ONE-SHOT"); |
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} |
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int setup_timer(int clock_id, int flags, int interval, timer_t *tm1) |
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{ |
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struct sigevent se; |
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struct itimerspec its1, its2; |
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int err; |
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/* Set up timer: */ |
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memset(&se, 0, sizeof(se)); |
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se.sigev_notify = SIGEV_SIGNAL; |
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se.sigev_signo = SIGRTMAX; |
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se.sigev_value.sival_int = 0; |
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max_latency_ns = 0; |
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alarmcount = 0; |
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timer_fired_early = 0; |
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err = timer_create(clock_id, &se, tm1); |
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if (err) { |
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if ((clock_id == CLOCK_REALTIME_ALARM) || |
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(clock_id == CLOCK_BOOTTIME_ALARM)) { |
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printf("%-22s %s missing CAP_WAKE_ALARM? : [UNSUPPORTED]\n", |
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clockstring(clock_id), |
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flags ? "ABSTIME":"RELTIME"); |
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/* Indicate timer isn't set, so caller doesn't wait */ |
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return 1; |
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} |
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printf("%s - timer_create() failed\n", clockstring(clock_id)); |
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return -1; |
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} |
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clock_gettime(clock_id, &start_time); |
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if (flags) { |
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its1.it_value = start_time; |
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its1.it_value.tv_sec += TIMER_SECS; |
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} else { |
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its1.it_value.tv_sec = TIMER_SECS; |
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its1.it_value.tv_nsec = 0; |
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} |
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its1.it_interval.tv_sec = interval; |
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its1.it_interval.tv_nsec = 0; |
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err = timer_settime(*tm1, flags, &its1, &its2); |
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if (err) { |
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printf("%s - timer_settime() failed\n", clockstring(clock_id)); |
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return -1; |
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} |
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return 0; |
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} |
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int check_timer_latency(int flags, int interval) |
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{ |
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int err = 0; |
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describe_timer(flags, interval); |
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printf("timer fired early: %7d : ", timer_fired_early); |
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if (!timer_fired_early) { |
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printf("[OK]\n"); |
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} else { |
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printf("[FAILED]\n"); |
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err = -1; |
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} |
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describe_timer(flags, interval); |
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printf("max latency: %10lld ns : ", max_latency_ns); |
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if (max_latency_ns < UNRESONABLE_LATENCY) { |
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printf("[OK]\n"); |
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} else { |
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printf("[FAILED]\n"); |
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err = -1; |
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} |
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return err; |
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} |
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int check_alarmcount(int flags, int interval) |
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{ |
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describe_timer(flags, interval); |
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printf("count: %19d : ", alarmcount); |
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if (alarmcount == 1) { |
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printf("[OK]\n"); |
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return 0; |
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} |
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printf("[FAILED]\n"); |
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return -1; |
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} |
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int do_timer(int clock_id, int flags) |
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{ |
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timer_t tm1; |
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const int interval = TIMER_SECS; |
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int err; |
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err = setup_timer(clock_id, flags, interval, &tm1); |
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/* Unsupported case - return 0 to not fail the test */ |
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if (err) |
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return err == 1 ? 0 : err; |
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while (alarmcount < 5) |
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sleep(1); |
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timer_delete(tm1); |
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return check_timer_latency(flags, interval); |
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} |
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int do_timer_oneshot(int clock_id, int flags) |
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{ |
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timer_t tm1; |
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const int interval = 0; |
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struct timeval timeout; |
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int err; |
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err = setup_timer(clock_id, flags, interval, &tm1); |
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/* Unsupported case - return 0 to not fail the test */ |
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if (err) |
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return err == 1 ? 0 : err; |
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memset(&timeout, 0, sizeof(timeout)); |
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timeout.tv_sec = 5; |
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do { |
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err = select(0, NULL, NULL, NULL, &timeout); |
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} while (err == -1 && errno == EINTR); |
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timer_delete(tm1); |
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err = check_timer_latency(flags, interval); |
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err |= check_alarmcount(flags, interval); |
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return err; |
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} |
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int main(void) |
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{ |
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struct sigaction act; |
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int signum = SIGRTMAX; |
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int ret = 0; |
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/* Set up signal handler: */ |
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sigfillset(&act.sa_mask); |
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act.sa_flags = 0; |
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act.sa_handler = sigalarm; |
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sigaction(signum, &act, NULL); |
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printf("Setting timers for every %i seconds\n", TIMER_SECS); |
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for (clock_id = 0; clock_id < NR_CLOCKIDS; clock_id++) { |
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if ((clock_id == CLOCK_PROCESS_CPUTIME_ID) || |
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(clock_id == CLOCK_THREAD_CPUTIME_ID) || |
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(clock_id == CLOCK_MONOTONIC_RAW) || |
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(clock_id == CLOCK_REALTIME_COARSE) || |
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(clock_id == CLOCK_MONOTONIC_COARSE) || |
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(clock_id == CLOCK_HWSPECIFIC)) |
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continue; |
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ret |= do_timer(clock_id, TIMER_ABSTIME); |
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ret |= do_timer(clock_id, 0); |
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ret |= do_timer_oneshot(clock_id, TIMER_ABSTIME); |
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ret |= do_timer_oneshot(clock_id, 0); |
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} |
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if (ret) |
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return ksft_exit_fail(); |
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return ksft_exit_pass(); |
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}
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