Update ABI definition files
[urcu.git] / tests / common / debug-yield.h
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1#ifndef URCU_TESTS_DEBUG_YIELD_H
2#define URCU_TESTS_DEBUG_YIELD_H
3
4/*
5 * debug-yield.h
6 *
7 * Userspace RCU library tests - Debugging header
8 *
9 * Copyright (c) 2009 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
10 * Copyright (c) 2009 Paul E. McKenney, IBM Corporation.
11 *
12 * This library is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU Lesser General Public
14 * License as published by the Free Software Foundation; either
15 * version 2.1 of the License, or (at your option) any later version.
16 *
17 * This library is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
20 * Lesser General Public License for more details.
21 *
22 * You should have received a copy of the GNU Lesser General Public
23 * License along with this library; if not, write to the Free Software
24 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
25 *
26 * IBM's contributions to this file may be relicensed under LGPLv2 or later.
27 */
28
29#include <sched.h>
30#include <time.h>
31#include <pthread.h>
32#include <unistd.h>
33
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34#include <compat-rand.h>
35
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36#define RCU_YIELD_READ (1 << 0)
37#define RCU_YIELD_WRITE (1 << 1)
38
39/*
40 * Updates with RCU_SIGNAL are much slower. Account this in the delay.
41 */
42#ifdef RCU_SIGNAL
43/* maximum sleep delay, in us */
44#define MAX_SLEEP 30000
45#else
46#define MAX_SLEEP 50
47#endif
48
49extern unsigned int rcu_yield_active;
50extern DECLARE_URCU_TLS(unsigned int, rcu_rand_yield);
51
52#ifdef DEBUG_YIELD
53static inline void rcu_debug_yield_read(void)
54{
55 if (rcu_yield_active & RCU_YIELD_READ)
56 if (rand_r(&URCU_TLS(rcu_rand_yield)) & 0x1)
57 usleep(rand_r(&URCU_TLS(rcu_rand_yield)) % MAX_SLEEP);
58}
59
60static inline void rcu_debug_yield_write(void)
61{
62 if (rcu_yield_active & RCU_YIELD_WRITE)
63 if (rand_r(&URCU_TLS(rcu_rand_yield)) & 0x1)
64 usleep(rand_r(&URCU_TLS(rcu_rand_yield)) % MAX_SLEEP);
65}
66
67static inline void rcu_debug_yield_enable(unsigned int flags)
68{
69 rcu_yield_active |= flags;
70}
71
72static inline void rcu_debug_yield_disable(unsigned int flags)
73{
74 rcu_yield_active &= ~flags;
75}
76
77static inline void rcu_debug_yield_init(void)
78{
79 URCU_TLS(rcu_rand_yield) = time(NULL) ^ (unsigned long) pthread_self();
80}
81#else /* DEBUG_YIELD */
82static inline void rcu_debug_yield_read(void)
83{
84}
85
86static inline void rcu_debug_yield_write(void)
87{
88}
89
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90static inline void rcu_debug_yield_enable(
91 unsigned int flags __attribute__((unused)))
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92{
93}
94
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95static inline void rcu_debug_yield_disable(
96 unsigned int flags __attribute__((unused)))
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97{
98}
99
100static inline void rcu_debug_yield_init(void)
101{
102}
103#endif
104
105#endif /* URCU_TESTS_DEBUG_YIELD_H */
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