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)
44 pthread_rwlock_t lock
= PTHREAD_RWLOCK_INITIALIZER
;
46 static struct test_array test_array
= { 8 };
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)
52 #define WRITE_LOOP 2000U
57 static cycles_t reader_time
[NR_READ
] __attribute__((aligned(128)));
59 void *thr_reader(void *arg
)
62 cycles_t time1
, time2
;
64 printf("thread_begin %s, thread id : %lx, tid %lu\n",
65 "reader", pthread_self(), (unsigned long)gettid());
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
);
78 reader_time
[(unsigned long)arg
] = time2
- time1
;
81 printf("thread_end %s, thread id : %lx, tid %lu\n",
82 "reader", pthread_self(), (unsigned long)gettid());
87 void *thr_writer(void *arg
)
91 printf("thread_begin %s, thread id : %lx, tid %lu\n",
92 "writer", pthread_self(), (unsigned long)gettid());
95 for (i
= 0; i
< WRITE_LOOP
; i
++) {
96 pthread_rwlock_wrlock(&lock
);
98 pthread_rwlock_unlock(&lock
);
102 printf("thread_end %s, thread id : %lx, tid %lu\n",
103 "writer", pthread_self(), (unsigned long)gettid());
110 pthread_t tid_reader
[NR_READ
], tid_writer
[NR_WRITE
];
113 cycles_t tot_time
= 0;
115 printf("thread %-6s, thread id : %lx, tid %lu\n",
116 "main", pthread_self(), (unsigned long)gettid());
118 for (i
= 0; i
< NR_READ
; i
++) {
119 err
= pthread_create(&tid_reader
[i
], NULL
, thr_reader
,
124 for (i
= 0; i
< NR_WRITE
; i
++) {
125 err
= pthread_create(&tid_writer
[i
], NULL
, thr_writer
, NULL
);
132 for (i
= 0; i
< NR_READ
; i
++) {
133 err
= pthread_join(tid_reader
[i
], &tret
);
136 tot_time
+= reader_time
[i
];
138 for (i
= 0; i
< NR_WRITE
; i
++) {
139 err
= pthread_join(tid_writer
[i
], &tret
);
143 printf("Time per read : %g cycles\n",
144 (double)tot_time
/ ((double)NR_READ
* (double)READ_LOOP
));