634cf976688e48b6b970ddd770d4a951af32ff41
[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@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 #include <errno.h>
36
37 #include <urcu/arch.h>
38
39 #if defined(_syscall0)
40 _syscall0(pid_t, gettid)
41 #elif defined(__NR_gettid)
42 static inline pid_t gettid(void)
43 {
44 return syscall(__NR_gettid);
45 }
46 #else
47 #warning "use pid as tid"
48 static inline pid_t gettid(void)
49 {
50 return getpid();
51 }
52 #endif
53
54 #ifndef DYNAMIC_LINK_TEST
55 #define _LGPL_SOURCE
56 #else
57 #define debug_yield_read()
58 #endif
59 #include <urcu.h>
60
61 static inline void loop_sleep(unsigned long l)
62 {
63 while(l-- != 0)
64 cpu_relax();
65 }
66
67 #define LOOPS 1048576
68 #define TESTS 10
69
70 int main(int argc, char **argv)
71 {
72 unsigned long i;
73 cycles_t time1, time2;
74 cycles_t time_tot = 0;
75 double cpl;
76
77 for (i = 0; i < TESTS; i++) {
78 time1 = get_cycles();
79 loop_sleep(LOOPS);
80 time2 = get_cycles();
81 time_tot += time2 - time1;
82 }
83 cpl = ((double)time_tot) / (double)TESTS / (double)LOOPS;
84
85 printf("CALIBRATION : %g cycles per loop\n", cpl);
86 printf("time_tot = %llu, LOOPS = %d, TESTS = %d\n",
87 time_tot, LOOPS, TESTS);
88
89 return 0;
90 }
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