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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 | ||
36 | #include "arch.h" | |
37 | ||
38 | #if defined(_syscall0) | |
39 | _syscall0(pid_t, gettid) | |
40 | #elif defined(__NR_gettid) | |
41 | static inline pid_t gettid(void) | |
42 | { | |
43 | return syscall(__NR_gettid); | |
44 | } | |
45 | #else | |
46 | #warning "use pid as tid" | |
47 | static 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 | |
58 | #include "urcu.h" | |
59 | ||
60 | static 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 | ||
69 | int main(int argc, char **argv) | |
70 | { | |
71 | unsigned long i; | |
72 | cycles_t time1, time2; | |
73 | cycles_t time_tot = 0; | |
74 | ||
75 | for (i = 0; i < TESTS; i++) { | |
76 | time1 = get_cycles(); | |
77 | loop_sleep(LOOPS); | |
78 | time2 = get_cycles(); | |
79 | time_tot += time2 - time1; | |
80 | } | |
81 | time_tot /= TESTS; | |
82 | time_tot /= LOOPS; | |
83 | ||
84 | printf("CALIBRATION : %llu cycles per loop\n", time_tot); | |
85 | ||
86 | return 0; | |
87 | } |