wfcqueue: introduce nonblocking API
[urcu.git] / tests / test_looplen.c
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1/*
2 * test_looplen.c
3 *
4 * Userspace RCU library - test program
5 *
6982d6d7 6 * Copyright February 2009 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
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7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License along
19 * with this program; if not, write to the Free Software Foundation, Inc.,
20 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
21 */
22
23#define _GNU_SOURCE
24#include <stdio.h>
25#include <pthread.h>
26#include <stdlib.h>
27#include <string.h>
28#include <sys/types.h>
29#include <sys/wait.h>
30#include <unistd.h>
31#include <stdio.h>
32#include <assert.h>
fd6a23f2 33#include <sched.h>
94b343fd 34#include <errno.h>
fd6a23f2 35
ec4e58a3 36#include <urcu/arch.h>
fd6a23f2 37
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38#ifdef __linux__
39#include <syscall.h>
40#endif
41
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42#if defined(_syscall0)
43_syscall0(pid_t, gettid)
44#elif defined(__NR_gettid)
45static inline pid_t gettid(void)
46{
47 return syscall(__NR_gettid);
48}
49#else
50#warning "use pid as tid"
51static inline pid_t gettid(void)
52{
53 return getpid();
54}
55#endif
56
57#ifndef DYNAMIC_LINK_TEST
58#define _LGPL_SOURCE
59#else
60#define debug_yield_read()
61#endif
ec4e58a3 62#include <urcu.h>
fd6a23f2 63
ab0aacbe 64static inline void loop_sleep(unsigned long loops)
fd6a23f2 65{
ab0aacbe 66 while (loops-- != 0)
06f22bdb 67 caa_cpu_relax();
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68}
69
70#define LOOPS 1048576
71#define TESTS 10
72
73int main(int argc, char **argv)
74{
75 unsigned long i;
76 cycles_t time1, time2;
77 cycles_t time_tot = 0;
85d2a666 78 double cpl;
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79
80 for (i = 0; i < TESTS; i++) {
06f22bdb 81 time1 = caa_get_cycles();
fd6a23f2 82 loop_sleep(LOOPS);
06f22bdb 83 time2 = caa_get_cycles();
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84 time_tot += time2 - time1;
85 }
85d2a666 86 cpl = ((double)time_tot) / (double)TESTS / (double)LOOPS;
fd6a23f2 87
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88 printf("CALIBRATION : %g cycles per loop\n", cpl);
89 printf("time_tot = %llu, LOOPS = %d, TESTS = %d\n",
90 time_tot, LOOPS, TESTS);
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91
92 return 0;
93}
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