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61 lines
1.4 KiB
C
61 lines
1.4 KiB
C
/*
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* Copyright (C) 2014 Ludwig Ortmann <ludwig.ortmann@fu-berlin.de>
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*
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* This file is subject to the terms and conditions of the GNU Lesser
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* General Public License v2.1. See the file LICENSE in the top level
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* directory for more details.
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*/
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/**
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* @ingroup tests
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* @{
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*
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* @file
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* @brief Hwtimer test application
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*
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* @author Ludwig Ortmann <ludwig.ortmann@fu-berlin.de>
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*
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* @}
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*/
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#include <stdio.h>
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#include <limits.h>
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#include <stdlib.h>
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#include <math.h>
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#include "board_uart0.h"
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#include "posix_io.h"
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#include "hwtimer.h"
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#include "thread.h"
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int main(void)
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{
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puts("This is a regression test for a race condition in hwtimer_wait.");
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puts("When the race condition is hit, the timer will wait for a very very long time.");
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int iterations = 10000;
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/* `#define I_CHANGED_START_DURATION 1` or update the constant if
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* you change start_duration */
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int start_duration = 256;
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long duration = iterations * (
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/* geometric series */
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#if I_CHANGED_START_DURATION
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(1 - pow(2,(log2(start_duration) + 1)))
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/ (1 - 2)
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#else
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511.0
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#endif
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);
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printf("The test should take about %li sec.\n", (HWTIMER_TICKS_TO_US(duration)/1000000));
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for (unsigned long r = iterations; r > 0; r--) {
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for (unsigned long i = start_duration; i; i = i >> 1) {
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hwtimer_wait(i);
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}
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}
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puts("success");
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return 0;
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}
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