palemoon-dev/platform/nsprpub/pr/tests/initclk.c

/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

/*
 * This is a regression test for the bug that the interval timer
 * is not initialized when _PR_CreateCPU calls PR_IntervalNow.
 * The bug would make this test program finish prematurely,
 * when the SHORT_TIMEOUT period expires.  The correct behavior
 * is for the test to finish when the LONG_TIMEOUT period expires.
 */

#include "prlock.h"
#include "prcvar.h"
#include "prthread.h"
#include "prinrval.h"
#include "prlog.h"
#include <stdio.h>
#include <stdlib.h>

/* The timeouts, in milliseconds */
#define SHORT_TIMEOUT 1000
#define LONG_TIMEOUT 3000

PRLock *lock1, *lock2;
PRCondVar *cv1, *cv2;

void ThreadFunc(void *arg)
{
    PR_Lock(lock1);
    PR_WaitCondVar(cv1, PR_MillisecondsToInterval(SHORT_TIMEOUT));
    PR_Unlock(lock1);
}

int main(int argc, char **argv)
{
    PRThread *thread;
    PRIntervalTime start, end;
    PRUint32 elapsed_ms;

    lock1 = PR_NewLock();
    PR_ASSERT(NULL != lock1);
    cv1 = PR_NewCondVar(lock1);
    PR_ASSERT(NULL != cv1);
    lock2 = PR_NewLock();
    PR_ASSERT(NULL != lock2);
    cv2 = PR_NewCondVar(lock2);
    PR_ASSERT(NULL != cv2);
    start = PR_IntervalNow();
    thread = PR_CreateThread(
                 PR_USER_THREAD,
                 ThreadFunc,
                 NULL,
                 PR_PRIORITY_NORMAL,
                 PR_LOCAL_THREAD,
                 PR_JOINABLE_THREAD,
                 0);
    PR_ASSERT(NULL != thread);
    PR_Lock(lock2);
    PR_WaitCondVar(cv2, PR_MillisecondsToInterval(LONG_TIMEOUT));
    PR_Unlock(lock2);
    PR_JoinThread(thread);
    end = PR_IntervalNow();
    elapsed_ms = PR_IntervalToMilliseconds((PRIntervalTime)(end - start));
    /* Allow 100ms imprecision */
    if (elapsed_ms < LONG_TIMEOUT - 100 || elapsed_ms > LONG_TIMEOUT + 100) {
        printf("Elapsed time should be %u ms but is %u ms\n",
               LONG_TIMEOUT, elapsed_ms);
        printf("FAIL\n");
        exit(1);
    }
    printf("Elapsed time: %u ms, expected time: %u ms\n",
           LONG_TIMEOUT, elapsed_ms);
    printf("PASS\n");
    return 0;
}