wfcqueue: introduce nonblocking API
[urcu.git] / tests / test_looplen.c
1 /*
2 * test_looplen.c
3 *
4 * Userspace RCU library - test program
5 *
6 * Copyright February 2009 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
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 <sched.h>
34 #include <errno.h>
35
36 #include <urcu/arch.h>
37
38 #ifdef __linux__
39 #include <syscall.h>
40 #endif
41
42 #if defined(_syscall0)
43 _syscall0(pid_t, gettid)
44 #elif defined(__NR_gettid)
45 static inline pid_t gettid(void)
46 {
47 return syscall(__NR_gettid);
48 }
49 #else
50 #warning "use pid as tid"
51 static 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
62 #include <urcu.h>
63
64 static inline void loop_sleep(unsigned long loops)
65 {
66 while (loops-- != 0)
67 caa_cpu_relax();
68 }
69
70 #define LOOPS 1048576
71 #define TESTS 10
72
73 int main(int argc, char **argv)
74 {
75 unsigned long i;
76 cycles_t time1, time2;
77 cycles_t time_tot = 0;
78 double cpl;
79
80 for (i = 0; i < TESTS; i++) {
81 time1 = caa_get_cycles();
82 loop_sleep(LOOPS);
83 time2 = caa_get_cycles();
84 time_tot += time2 - time1;
85 }
86 cpl = ((double)time_tot) / (double)TESTS / (double)LOOPS;
87
88 printf("CALIBRATION : %g cycles per loop\n", cpl);
89 printf("time_tot = %llu, LOOPS = %d, TESTS = %d\n",
90 time_tot, LOOPS, TESTS);
91
92 return 0;
93 }
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