The Fuchsia Authors
102 linhas
2.8 KiB
C
102 linhas
2.8 KiB
C
// Copyright 2016 The Fuchsia Authors
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// Copyright (c) 2012 Travis Geiselbrecht
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//
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// Use of this source code is governed by a MIT-style
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// license that can be found in the LICENSE file or at
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// https://opensource.org/licenses/MIT
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#include <stdio.h>
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#include <rand.h>
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#include <err.h>
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#include <app/tests.h>
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#include <kernel/thread.h>
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#include <kernel/mutex.h>
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#include <kernel/semaphore.h>
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#include <kernel/event.h>
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#include <platform.h>
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void clock_tests(void)
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{
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uint32_t c;
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lk_time_t t;
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lk_bigtime_t t2;
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thread_sleep(100);
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c = arch_cycle_count();
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t = current_time();
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c = arch_cycle_count() - c;
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printf("%u cycles per current_time()\n", c);
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thread_sleep(100);
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c = arch_cycle_count();
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t2 = current_time_hires();
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c = arch_cycle_count() - c;
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printf("%u cycles per current_time_hires()\n", c);
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printf("making sure time never goes backwards\n");
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{
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printf("testing current_time()\n");
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lk_time_t start = current_time();
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lk_time_t last = start;
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for (;;) {
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t = current_time();
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//printf("%lu %lu\n", last, t);
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if (TIME_LT(t, last)) {
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printf("WARNING: time ran backwards: %lu < %lu\n", t, last);
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last = t;
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continue;
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}
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last = t;
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if (last - start > 5000)
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break;
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}
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}
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{
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printf("testing current_time_hires()\n");
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lk_bigtime_t start = current_time_hires();
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lk_bigtime_t last = start;
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for (;;) {
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t2 = current_time_hires();
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//printf("%llu %llu\n", last, t2);
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if (t2 < last) {
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printf("WARNING: time ran backwards: %llu < %llu\n", t2, last);
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last = t2;
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continue;
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}
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last = t2;
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if (last - start > 5000000)
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break;
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}
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}
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printf("making sure current_time() and current_time_hires() are always the same base\n");
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{
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lk_time_t start = current_time();
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for (;;) {
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t = current_time();
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t2 = current_time_hires();
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if (t > ((t2 + 500) / 1000)) {
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printf("WARNING: current_time() ahead of current_time_hires() %lu %llu\n", t, t2);
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}
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if (t - start > 5000)
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break;
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}
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}
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printf("counting to 5, in one second intervals\n");
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for (int i = 0; i < 5; i++) {
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thread_sleep(1000);
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printf("%d\n", i + 1);
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}
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printf("measuring cpu clock against current_time_hires()\n");
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for (int i = 0; i < 5; i++) {
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uint cycles = arch_cycle_count();
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lk_bigtime_t start = current_time_hires();
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while ((current_time_hires() - start) < 1000000)
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;
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cycles = arch_cycle_count() - cycles;
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printf("%u cycles per second\n", cycles);
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}
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}
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