Rename CONFIG_URCU_AVOID_SIGNALS to URCU_MB, and README updates
[urcu.git] / tests / test_looplen.c
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1/*
2 * test_looplen.c
3 *
4 * Userspace RCU library - test program
5 *
6 * Copyright February 2009 - Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
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>
33#include <sys/syscall.h>
34#include <sched.h>
35
833dbdb6 36#include "../arch.h"
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37
38#if defined(_syscall0)
39_syscall0(pid_t, gettid)
40#elif defined(__NR_gettid)
41static inline pid_t gettid(void)
42{
43 return syscall(__NR_gettid);
44}
45#else
46#warning "use pid as tid"
47static inline pid_t gettid(void)
48{
49 return getpid();
50}
51#endif
52
53#ifndef DYNAMIC_LINK_TEST
54#define _LGPL_SOURCE
55#else
56#define debug_yield_read()
57#endif
833dbdb6 58#include "../urcu.h"
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59
60static inline void loop_sleep(unsigned long l)
61{
62 while(l-- != 0)
63 cpu_relax();
64}
65
66#define LOOPS 1048576
67#define TESTS 10
68
69int main(int argc, char **argv)
70{
71 unsigned long i;
72 cycles_t time1, time2;
73 cycles_t time_tot = 0;
85d2a666 74 double cpl;
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75
76 for (i = 0; i < TESTS; i++) {
77 time1 = get_cycles();
78 loop_sleep(LOOPS);
79 time2 = get_cycles();
80 time_tot += time2 - time1;
81 }
85d2a666 82 cpl = ((double)time_tot) / (double)TESTS / (double)LOOPS;
fd6a23f2 83
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84 printf("CALIBRATION : %g cycles per loop\n", cpl);
85 printf("time_tot = %llu, LOOPS = %d, TESTS = %d\n",
86 time_tot, LOOPS, TESTS);
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87
88 return 0;
89}
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