4 * Userspace RCU library - test program
6 * Copyright February 2009 - Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
8 * Distributed under GPLv2
15 #include <sys/types.h>
20 #include <sys/syscall.h>
23 #if defined(_syscall0)
24 _syscall0(pid_t
, gettid
)
25 #elif defined(__NR_gettid)
26 static inline pid_t
gettid(void)
28 return syscall(__NR_gettid
);
31 #warning "use pid as tid"
32 static inline pid_t
gettid(void)
38 #define rdtscll(val) do { \
39 unsigned int __a,__d; \
40 asm volatile("rdtsc" : "=a" (__a), "=d" (__d)); \
41 (val) = ((unsigned long long)__a) | (((unsigned long long)__d)<<32); \
44 typedef unsigned long long cycles_t
;
46 static inline cycles_t
get_cycles (void)
48 unsigned long long ret
= 0;
60 pthread_rwlock_t lock
= PTHREAD_RWLOCK_INITIALIZER
;
62 static struct test_array test_array
= { 8 };
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)
68 #define WRITE_LOOP 2000U
73 static cycles_t reader_time
[NR_READ
] __attribute__((aligned(128)));
75 void *thr_reader(void *arg
)
78 cycles_t time1
, time2
;
80 printf("thread_begin %s, thread id : %lx, tid %lu\n",
81 "reader", pthread_self(), (unsigned long)gettid());
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
);
94 reader_time
[(unsigned long)arg
] = time2
- time1
;
97 printf("thread_end %s, thread id : %lx, tid %lu\n",
98 "reader", pthread_self(), (unsigned long)gettid());
103 void *thr_writer(void *arg
)
107 printf("thread_begin %s, thread id : %lx, tid %lu\n",
108 "writer", pthread_self(), (unsigned long)gettid());
111 for (i
= 0; i
< WRITE_LOOP
; i
++) {
112 pthread_rwlock_wrlock(&lock
);
114 pthread_rwlock_unlock(&lock
);
118 printf("thread_end %s, thread id : %lx, tid %lu\n",
119 "writer", pthread_self(), (unsigned long)gettid());
126 pthread_t tid_reader
[NR_READ
], tid_writer
[NR_WRITE
];
129 cycles_t tot_time
= 0;
131 printf("thread %-6s, thread id : %lx, tid %lu\n",
132 "main", pthread_self(), (unsigned long)gettid());
134 for (i
= 0; i
< NR_READ
; i
++) {
135 err
= pthread_create(&tid_reader
[i
], NULL
, thr_reader
,
140 for (i
= 0; i
< NR_WRITE
; i
++) {
141 err
= pthread_create(&tid_writer
[i
], NULL
, thr_writer
, NULL
);
148 for (i
= 0; i
< NR_READ
; i
++) {
149 err
= pthread_join(tid_reader
[i
], &tret
);
152 tot_time
+= reader_time
[i
];
154 for (i
= 0; i
< NR_WRITE
; i
++) {
155 err
= pthread_join(tid_writer
[i
], &tret
);
159 printf("Time per read : %g cycles\n",
160 (double)tot_time
/ ((double)NR_READ
* (double)READ_LOOP
));