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Test: Timestamp

This file provides implementation of timestamp_test()

Scope of the Test

This tests whether timestamp API works.

API tested:

This file is pjlib-test/timestamp.c

/* $Id$ */
/*
* Copyright (C) 2008-2011 Teluu Inc. (http://www.teluu.com)
* Copyright (C) 2003-2008 Benny Prijono <benny@prijono.org>
*
* 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "test.h"
#include <pj/os.h>
#include <pj/log.h>
#include <pj/rand.h>
#if INCLUDE_TIMESTAMP_TEST
#define THIS_FILE "timestamp"
static int timestamp_accuracy()
{
pj_timestamp freq, t1, t2;
pj_time_val tv1, tv2, tvtmp;
pj_int64_t msec, tics;
pj_int64_t diff;
PJ_LOG(3,(THIS_FILE, "...testing frequency accuracy (pls wait)"));
/* Get the start time */
pj_gettimeofday(&tvtmp);
do {
} while (PJ_TIME_VAL_EQ(tvtmp, tv1));
/* Sleep for 10 seconds */
/* Get end time */
pj_gettimeofday(&tvtmp);
do {
} while (PJ_TIME_VAL_EQ(tvtmp, tv2));
/* Get the elapsed time */
PJ_TIME_VAL_SUB(tv2, tv1);
msec = PJ_TIME_VAL_MSEC(tv2);
/* Check that the frequency match the elapsed time */
tics = t2.u64 - t1.u64;
diff = tics - (msec * freq.u64 / 1000);
if (diff < 0)
diff = -diff;
/* Only allow 1 msec mismatch */
if (diff > (pj_int64_t)(freq.u64 / 1000)) {
PJ_LOG(3,(THIS_FILE, "....error: timestamp drifted by %d usec after "
"%d msec",
(pj_uint32_t)(diff * 1000000 / freq.u64),
msec));
return -2000;
/* Otherwise just print warning if timestamp drifted by >1 usec */
} else if (diff > (pj_int64_t)(freq.u64 / 1000000)) {
PJ_LOG(3,(THIS_FILE, "....warning: timestamp drifted by %d usec after "
"%d msec",
(pj_uint32_t)(diff * 1000000 / freq.u64),
msec));
} else {
PJ_LOG(3,(THIS_FILE, "....good. Timestamp is accurate down to"
" nearest usec."));
}
return 0;
}
int timestamp_test(void)
{
enum { CONSECUTIVE_LOOP = 100 };
volatile unsigned i;
pj_timestamp freq, t1, t2;
pj_time_val tv1, tv2;
unsigned elapsed;
PJ_LOG(3,(THIS_FILE, "...Testing timestamp (high res time)"));
/* Get and display timestamp frequency. */
if ((rc=pj_get_timestamp_freq(&freq)) != PJ_SUCCESS) {
app_perror("...ERROR: get timestamp freq", rc);
return -1000;
}
PJ_LOG(3,(THIS_FILE, "....frequency: hiword=%lu loword=%lu",
freq.u32.hi, freq.u32.lo));
PJ_LOG(3,(THIS_FILE, "...checking if time can run backwards (pls wait).."));
/*
* Check if consecutive readings should yield timestamp value
* that is bigger than previous value.
* First we get the first timestamp.
*/
rc = pj_get_timestamp(&t1);
if (rc != PJ_SUCCESS) {
app_perror("...ERROR: pj_get_timestamp", rc);
return -1001;
}
rc = pj_gettimeofday(&tv1);
if (rc != PJ_SUCCESS) {
app_perror("...ERROR: pj_gettimeofday", rc);
return -1002;
}
for (i=0; i<CONSECUTIVE_LOOP; ++i) {
rc = pj_get_timestamp(&t2);
if (rc != PJ_SUCCESS) {
app_perror("...ERROR: pj_get_timestamp", rc);
return -1003;
}
rc = pj_gettimeofday(&tv2);
if (rc != PJ_SUCCESS) {
app_perror("...ERROR: pj_gettimeofday", rc);
return -1004;
}
/* compare t2 with t1, expecting t2 >= t1. */
if (t2.u32.hi < t1.u32.hi ||
(t2.u32.hi == t1.u32.hi && t2.u32.lo < t1.u32.lo))
{
PJ_LOG(3,(THIS_FILE, "...ERROR: timestamp run backwards!"));
return -1005;
}
/* compare tv2 with tv1, expecting tv2 >= tv1. */
if (PJ_TIME_VAL_LT(tv2, tv1)) {
PJ_LOG(3,(THIS_FILE, "...ERROR: time run backwards!"));
return -1006;
}
}
/*
* Simple test to time some loop.
*/
PJ_LOG(3,(THIS_FILE, "....testing simple 1000000 loop"));
/* Mark start time. */
if ((rc=pj_get_timestamp(&t1)) != PJ_SUCCESS) {
app_perror("....error: cat't get timestamp", rc);
return -1010;
}
/* Loop.. */
for (i=0; i<1000000; ++i) {
/* Try to do something so that smart compilers wont
* remove this silly loop.
*/
null_func();
}
/* Mark end time. */
/* Get elapsed time in usec. */
elapsed = pj_elapsed_usec(&t1, &t2);
PJ_LOG(3,(THIS_FILE, "....elapsed: %u usec", (unsigned)elapsed));
/* See if elapsed time is "reasonable".
* This should be good even on 50Mhz embedded powerpc.
*/
if (elapsed < 1 || elapsed > 1000000) {
PJ_LOG(3,(THIS_FILE, "....error: elapsed time outside window (%u, "
"t1.u32.hi=%u, t1.u32.lo=%u, "
"t2.u32.hi=%u, t2.u32.lo=%u)",
elapsed,
t1.u32.hi, t1.u32.lo, t2.u32.hi, t2.u32.lo));
return -1030;
}
/* Testing time/timestamp accuracy */
rc = timestamp_accuracy();
if (rc != 0)
return rc;
return 0;
}
#else
/* To prevent warning about "translation unit is empty"
* when this test is disabled.
*/
int dummy_timestamp_test;
#endif /* INCLUDE_TIMESTAMP_TEST */
pj_status_t pj_gettimeofday(pj_time_val *tv)
pj_uint32_t hi
Definition: types.h:141
Definition: types.h:133
pj_uint32_t lo
Definition: types.h:142
OS dependent functions.
int pj_rand(void)
pj_status_t pj_thread_sleep(unsigned msec)
int pj_status_t
Definition: types.h:68
Logging Utility.
struct pj_timestamp::@9 u32
#define PJ_TIME_VAL_SUB(t1, t2)
Definition: types.h:481
@ PJ_SUCCESS
Definition: types.h:93
unsigned int pj_uint32_t
Definition: types.h:43
#define PJ_TIME_VAL_LT(t1, t2)
Definition: types.h:446
Definition: types.h:379
#define PJ_TIME_VAL_EQ(t1, t2)
Definition: types.h:414
#define PJ_LOG(level, arg)
Definition: log.h:107
pj_status_t pj_get_timestamp_freq(pj_timestamp *freq)
Random Number Generator.
pj_status_t pj_get_timestamp(pj_timestamp *ts)
pj_uint32_t pj_elapsed_usec(const pj_timestamp *start, const pj_timestamp *stop)
#define PJ_TIME_VAL_MSEC(t)
Definition: types.h:404

 


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