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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 | ||
20bf310a MD |
38 | #include "urcu.h" |
39 | ||
40 | struct test_array { | |
41 | int a; | |
42 | }; | |
43 | ||
44 | pthread_rwlock_t lock = PTHREAD_RWLOCK_INITIALIZER; | |
45 | ||
46 | static struct test_array test_array = { 8 }; | |
47 | ||
48 | #define OUTER_READ_LOOP 200U | |
49 | #define INNER_READ_LOOP 100000U | |
50 | #define READ_LOOP ((unsigned long long)OUTER_READ_LOOP * INNER_READ_LOOP) | |
51 | ||
52 | #define WRITE_LOOP 2000U | |
53 | ||
54 | #define NR_READ 10 | |
55 | #define NR_WRITE 9 | |
56 | ||
57 | static cycles_t reader_time[NR_READ] __attribute__((aligned(128))); | |
58 | ||
59 | void *thr_reader(void *arg) | |
60 | { | |
61 | int i, j; | |
62 | cycles_t time1, time2; | |
63 | ||
64 | printf("thread_begin %s, thread id : %lx, tid %lu\n", | |
65 | "reader", pthread_self(), (unsigned long)gettid()); | |
66 | sleep(2); | |
67 | ||
68 | time1 = get_cycles(); | |
69 | for (i = 0; i < OUTER_READ_LOOP; i++) { | |
70 | for (j = 0; j < INNER_READ_LOOP; j++) { | |
71 | pthread_rwlock_rdlock(&lock); | |
72 | assert(test_array.a == 8); | |
73 | pthread_rwlock_unlock(&lock); | |
74 | } | |
75 | } | |
76 | time2 = get_cycles(); | |
77 | ||
78 | reader_time[(unsigned long)arg] = time2 - time1; | |
79 | ||
80 | sleep(2); | |
81 | printf("thread_end %s, thread id : %lx, tid %lu\n", | |
82 | "reader", pthread_self(), (unsigned long)gettid()); | |
83 | return ((void*)1); | |
84 | ||
85 | } | |
86 | ||
87 | void *thr_writer(void *arg) | |
88 | { | |
89 | int i; | |
90 | ||
91 | printf("thread_begin %s, thread id : %lx, tid %lu\n", | |
92 | "writer", pthread_self(), (unsigned long)gettid()); | |
93 | sleep(2); | |
94 | ||
95 | for (i = 0; i < WRITE_LOOP; i++) { | |
96 | pthread_rwlock_wrlock(&lock); | |
97 | test_array.a = 8; | |
98 | pthread_rwlock_unlock(&lock); | |
99 | usleep(1); | |
100 | } | |
101 | ||
102 | printf("thread_end %s, thread id : %lx, tid %lu\n", | |
103 | "writer", pthread_self(), (unsigned long)gettid()); | |
104 | return ((void*)2); | |
105 | } | |
106 | ||
107 | int main() | |
108 | { | |
109 | int err; | |
110 | pthread_t tid_reader[NR_READ], tid_writer[NR_WRITE]; | |
111 | void *tret; | |
112 | int i; | |
113 | cycles_t tot_time = 0; | |
114 | ||
115 | printf("thread %-6s, thread id : %lx, tid %lu\n", | |
116 | "main", pthread_self(), (unsigned long)gettid()); | |
117 | ||
118 | for (i = 0; i < NR_READ; i++) { | |
119 | err = pthread_create(&tid_reader[i], NULL, thr_reader, | |
120 | (void *)(long)i); | |
121 | if (err != 0) | |
122 | exit(1); | |
123 | } | |
124 | for (i = 0; i < NR_WRITE; i++) { | |
125 | err = pthread_create(&tid_writer[i], NULL, thr_writer, NULL); | |
126 | if (err != 0) | |
127 | exit(1); | |
128 | } | |
129 | ||
130 | sleep(10); | |
131 | ||
132 | for (i = 0; i < NR_READ; i++) { | |
133 | err = pthread_join(tid_reader[i], &tret); | |
134 | if (err != 0) | |
135 | exit(1); | |
136 | tot_time += reader_time[i]; | |
137 | } | |
138 | for (i = 0; i < NR_WRITE; i++) { | |
139 | err = pthread_join(tid_writer[i], &tret); | |
140 | if (err != 0) | |
141 | exit(1); | |
142 | } | |
143 | printf("Time per read : %g cycles\n", | |
144 | (double)tot_time / ((double)NR_READ * (double)READ_LOOP)); | |
145 | ||
146 | return 0; | |
147 | } |