Fix: Move rand-compat to private src dir
[urcu.git] / tests / common / debug-yield.h
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
34 #include <compat-rand.h>
35
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
49 extern unsigned int rcu_yield_active;
50 extern DECLARE_URCU_TLS(unsigned int, rcu_rand_yield);
51
52 #ifdef DEBUG_YIELD
53 static 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
60 static 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
67 static inline void rcu_debug_yield_enable(unsigned int flags)
68 {
69 rcu_yield_active |= flags;
70 }
71
72 static inline void rcu_debug_yield_disable(unsigned int flags)
73 {
74 rcu_yield_active &= ~flags;
75 }
76
77 static 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 */
82 static inline void rcu_debug_yield_read(void)
83 {
84 }
85
86 static inline void rcu_debug_yield_write(void)
87 {
88 }
89
90 static inline void rcu_debug_yield_enable(unsigned int flags)
91 {
92 }
93
94 static inline void rcu_debug_yield_disable(unsigned int flags)
95 {
96 }
97
98 static inline void rcu_debug_yield_init(void)
99 {
100 }
101 #endif
102
103 #endif /* URCU_TESTS_DEBUG_YIELD_H */
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