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20bf310a MD |
1 | /* |
2 | * test_urcu.c | |
3 | * | |
4 | * Userspace RCU library - test program | |
5 | * | |
6 | * Copyright February 2009 - Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca> | |
7 | * | |
8 | * Distributed under GPLv2 | |
9 | */ | |
10 | ||
11 | #include <stdio.h> | |
12 | #include <pthread.h> | |
13 | #include <stdlib.h> | |
14 | #include <string.h> | |
15 | #include <sys/types.h> | |
16 | #include <sys/wait.h> | |
17 | #include <unistd.h> | |
18 | #include <stdio.h> | |
19 | #include <assert.h> | |
20 | #include <sys/syscall.h> | |
21 | #include <pthread.h> | |
22 | ||
23 | #if defined(_syscall0) | |
24 | _syscall0(pid_t, gettid) | |
25 | #elif defined(__NR_gettid) | |
26 | static inline pid_t gettid(void) | |
27 | { | |
28 | return syscall(__NR_gettid); | |
29 | } | |
30 | #else | |
31 | #warning "use pid as tid" | |
32 | static inline pid_t gettid(void) | |
33 | { | |
34 | return getpid(); | |
35 | } | |
36 | #endif | |
37 | ||
38 | #define rdtscll(val) do { \ | |
39 | unsigned int __a,__d; \ | |
40 | asm volatile("rdtsc" : "=a" (__a), "=d" (__d)); \ | |
5fa9dfe4 | 41 | (val) = ((unsigned long long)__a) | (((unsigned long long)__d)<<32); \ |
20bf310a MD |
42 | } while(0) |
43 | ||
44 | typedef unsigned long long cycles_t; | |
45 | ||
46 | static inline cycles_t get_cycles (void) | |
47 | { | |
48 | unsigned long long ret = 0; | |
49 | ||
50 | rdtscll(ret); | |
51 | return ret; | |
52 | } | |
53 | ||
54 | #include "urcu.h" | |
55 | ||
56 | struct test_array { | |
57 | int a; | |
58 | }; | |
59 | ||
60 | pthread_rwlock_t lock = PTHREAD_RWLOCK_INITIALIZER; | |
61 | ||
62 | static struct test_array test_array = { 8 }; | |
63 | ||
64 | #define OUTER_READ_LOOP 200U | |
65 | #define INNER_READ_LOOP 100000U | |
66 | #define READ_LOOP ((unsigned long long)OUTER_READ_LOOP * INNER_READ_LOOP) | |
67 | ||
68 | #define WRITE_LOOP 2000U | |
69 | ||
70 | #define NR_READ 10 | |
71 | #define NR_WRITE 9 | |
72 | ||
73 | static cycles_t reader_time[NR_READ] __attribute__((aligned(128))); | |
74 | ||
75 | void *thr_reader(void *arg) | |
76 | { | |
77 | int i, j; | |
78 | cycles_t time1, time2; | |
79 | ||
80 | printf("thread_begin %s, thread id : %lx, tid %lu\n", | |
81 | "reader", pthread_self(), (unsigned long)gettid()); | |
82 | sleep(2); | |
83 | ||
84 | time1 = get_cycles(); | |
85 | for (i = 0; i < OUTER_READ_LOOP; i++) { | |
86 | for (j = 0; j < INNER_READ_LOOP; j++) { | |
87 | pthread_rwlock_rdlock(&lock); | |
88 | assert(test_array.a == 8); | |
89 | pthread_rwlock_unlock(&lock); | |
90 | } | |
91 | } | |
92 | time2 = get_cycles(); | |
93 | ||
94 | reader_time[(unsigned long)arg] = time2 - time1; | |
95 | ||
96 | sleep(2); | |
97 | printf("thread_end %s, thread id : %lx, tid %lu\n", | |
98 | "reader", pthread_self(), (unsigned long)gettid()); | |
99 | return ((void*)1); | |
100 | ||
101 | } | |
102 | ||
103 | void *thr_writer(void *arg) | |
104 | { | |
105 | int i; | |
106 | ||
107 | printf("thread_begin %s, thread id : %lx, tid %lu\n", | |
108 | "writer", pthread_self(), (unsigned long)gettid()); | |
109 | sleep(2); | |
110 | ||
111 | for (i = 0; i < WRITE_LOOP; i++) { | |
112 | pthread_rwlock_wrlock(&lock); | |
113 | test_array.a = 8; | |
114 | pthread_rwlock_unlock(&lock); | |
115 | usleep(1); | |
116 | } | |
117 | ||
118 | printf("thread_end %s, thread id : %lx, tid %lu\n", | |
119 | "writer", pthread_self(), (unsigned long)gettid()); | |
120 | return ((void*)2); | |
121 | } | |
122 | ||
123 | int main() | |
124 | { | |
125 | int err; | |
126 | pthread_t tid_reader[NR_READ], tid_writer[NR_WRITE]; | |
127 | void *tret; | |
128 | int i; | |
129 | cycles_t tot_time = 0; | |
130 | ||
131 | printf("thread %-6s, thread id : %lx, tid %lu\n", | |
132 | "main", pthread_self(), (unsigned long)gettid()); | |
133 | ||
134 | for (i = 0; i < NR_READ; i++) { | |
135 | err = pthread_create(&tid_reader[i], NULL, thr_reader, | |
136 | (void *)(long)i); | |
137 | if (err != 0) | |
138 | exit(1); | |
139 | } | |
140 | for (i = 0; i < NR_WRITE; i++) { | |
141 | err = pthread_create(&tid_writer[i], NULL, thr_writer, NULL); | |
142 | if (err != 0) | |
143 | exit(1); | |
144 | } | |
145 | ||
146 | sleep(10); | |
147 | ||
148 | for (i = 0; i < NR_READ; i++) { | |
149 | err = pthread_join(tid_reader[i], &tret); | |
150 | if (err != 0) | |
151 | exit(1); | |
152 | tot_time += reader_time[i]; | |
153 | } | |
154 | for (i = 0; i < NR_WRITE; i++) { | |
155 | err = pthread_join(tid_writer[i], &tret); | |
156 | if (err != 0) | |
157 | exit(1); | |
158 | } | |
159 | printf("Time per read : %g cycles\n", | |
160 | (double)tot_time / ((double)NR_READ * (double)READ_LOOP)); | |
161 | ||
162 | return 0; | |
163 | } |