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Message-Id: <1426120815-32528-4-git-send-email-john.stultz@linaro.org>
Date: Wed, 11 Mar 2015 17:39:59 -0700
From: John Stultz <john.stultz@...aro.org>
To: Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Cc: John Stultz <john.stultz@...aro.org>,
Shuah Khan <shuahkh@....samsung.com>,
Prarit Bhargava <prarit@...hat.com>,
Thomas Gleixner <tglx@...utronix.de>,
Richard Cochran <richardcochran@...il.com>
Subject: [PATCH 03/19] selftests/timers: Add nanosleep test from timetest suite
Add my basic nanosleep test from my timetest suite.
This test validates that nanosleep doesn't return early
against a number of clockids.
Cc: Shuah Khan <shuahkh@....samsung.com>
Cc: Prarit Bhargava <prarit@...hat.com>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Richard Cochran <richardcochran@...il.com>
Signed-off-by: John Stultz <john.stultz@...aro.org>
---
tools/testing/selftests/timers/Makefile | 3 +-
tools/testing/selftests/timers/nanosleep.c | 174 +++++++++++++++++++++++++++++
2 files changed, 176 insertions(+), 1 deletion(-)
create mode 100644 tools/testing/selftests/timers/nanosleep.c
diff --git a/tools/testing/selftests/timers/Makefile b/tools/testing/selftests/timers/Makefile
index e65c543..9409423 100644
--- a/tools/testing/selftests/timers/Makefile
+++ b/tools/testing/selftests/timers/Makefile
@@ -2,12 +2,13 @@ CC = $(CROSS_COMPILE)gcc
BUILD_FLAGS = -DKTEST
CFLAGS += -O3 -Wl,-no-as-needed -Wall $(BUILD_FLAGS)
LDFLAGS += -lrt -lpthread
-bins = posix_timers
+bins = posix_timers nanosleep
all: ${bins}
run_tests: all
./posix_timers
+ ./nanosleep
clean:
rm -f ${bins}
diff --git a/tools/testing/selftests/timers/nanosleep.c b/tools/testing/selftests/timers/nanosleep.c
new file mode 100644
index 0000000..8a3c29d
--- /dev/null
+++ b/tools/testing/selftests/timers/nanosleep.c
@@ -0,0 +1,174 @@
+/* Make sure timers don't return early
+ * by: john stultz (johnstul@...ibm.com)
+ * John Stultz (john.stultz@...aro.org)
+ * (C) Copyright IBM 2012
+ * (C) Copyright Linaro 2013 2015
+ * Licensed under the GPLv2
+ *
+ * To build:
+ * $ gcc nanosleep.c -o nanosleep -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.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <time.h>
+#include <sys/time.h>
+#include <sys/timex.h>
+#include <string.h>
+#include <signal.h>
+#ifdef KTEST
+#include "../kselftest.h"
+#else
+static inline int ksft_exit_pass(void)
+{
+ exit(0);
+}
+static inline int ksft_exit_fail(void)
+{
+ exit(1);
+}
+#endif
+
+#define NSEC_PER_SEC 1000000000ULL
+
+#define CLOCK_REALTIME 0
+#define CLOCK_MONOTONIC 1
+#define CLOCK_PROCESS_CPUTIME_ID 2
+#define CLOCK_THREAD_CPUTIME_ID 3
+#define CLOCK_MONOTONIC_RAW 4
+#define CLOCK_REALTIME_COARSE 5
+#define CLOCK_MONOTONIC_COARSE 6
+#define CLOCK_BOOTTIME 7
+#define CLOCK_REALTIME_ALARM 8
+#define CLOCK_BOOTTIME_ALARM 9
+#define CLOCK_HWSPECIFIC 10
+#define CLOCK_TAI 11
+#define NR_CLOCKIDS 12
+
+#define UNSUPPORTED 0xf00f
+
+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";
+}
+
+/* returns 1 if a <= b, 0 otherwise */
+static inline int in_order(struct timespec a, struct timespec b)
+{
+ if (a.tv_sec < b.tv_sec)
+ return 1;
+ if (a.tv_sec > b.tv_sec)
+ return 0;
+ if (a.tv_nsec > b.tv_nsec)
+ return 0;
+ return 1;
+}
+
+struct timespec timespec_add(struct timespec ts, unsigned long long ns)
+{
+ ts.tv_nsec += ns;
+ while (ts.tv_nsec >= NSEC_PER_SEC) {
+ ts.tv_nsec -= NSEC_PER_SEC;
+ ts.tv_sec++;
+ }
+ return ts;
+}
+
+int nanosleep_test(int clockid, long long ns)
+{
+ struct timespec now, target, rel;
+
+ /* First check abs time */
+ if (clock_gettime(clockid, &now))
+ return UNSUPPORTED;
+ target = timespec_add(now, ns);
+
+ if (clock_nanosleep(clockid, TIMER_ABSTIME, &target, NULL))
+ return UNSUPPORTED;
+ clock_gettime(clockid, &now);
+
+ if (!in_order(target, now))
+ return -1;
+
+ /* Second check reltime */
+ clock_gettime(clockid, &now);
+ rel.tv_sec = 0;
+ rel.tv_nsec = 0;
+ rel = timespec_add(rel, ns);
+ target = timespec_add(now, ns);
+ clock_nanosleep(clockid, 0, &rel, NULL);
+ clock_gettime(clockid, &now);
+
+ if (!in_order(target, now))
+ return -1;
+ return 0;
+}
+
+int main(int argc, char **argv)
+{
+ long long length;
+ int clockid, ret;
+
+ for (clockid = CLOCK_REALTIME; clockid < NR_CLOCKIDS; clockid++) {
+
+ /* Skip cputime clockids since nanosleep won't increment cputime */
+ if (clockid == CLOCK_PROCESS_CPUTIME_ID ||
+ clockid == CLOCK_THREAD_CPUTIME_ID ||
+ clockid == CLOCK_HWSPECIFIC)
+ continue;
+
+ printf("Nanosleep %-31s ", clockstring(clockid));
+
+ length = 10;
+ while (length <= (NSEC_PER_SEC * 10)) {
+ ret = nanosleep_test(clockid, length);
+ if (ret == UNSUPPORTED) {
+ printf("[UNSUPPORTED]\n");
+ goto next;
+ }
+ if (ret < 0) {
+ printf("[FAILED]\n");
+ return ksft_exit_fail();
+ }
+ length *= 100;
+ }
+ printf("[OK]\n");
+next:
+ ret = 0;
+ }
+ return ksft_exit_pass();
+}
--
1.9.1
--
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