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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 | ||
34 | #define RCU_YIELD_READ (1 << 0) | |
35 | #define RCU_YIELD_WRITE (1 << 1) | |
36 | ||
37 | /* | |
38 | * Updates with RCU_SIGNAL are much slower. Account this in the delay. | |
39 | */ | |
40 | #ifdef RCU_SIGNAL | |
41 | /* maximum sleep delay, in us */ | |
42 | #define MAX_SLEEP 30000 | |
43 | #else | |
44 | #define MAX_SLEEP 50 | |
45 | #endif | |
46 | ||
47 | extern unsigned int rcu_yield_active; | |
48 | extern DECLARE_URCU_TLS(unsigned int, rcu_rand_yield); | |
49 | ||
50 | #ifdef DEBUG_YIELD | |
51 | static inline void rcu_debug_yield_read(void) | |
52 | { | |
53 | if (rcu_yield_active & RCU_YIELD_READ) | |
54 | if (rand_r(&URCU_TLS(rcu_rand_yield)) & 0x1) | |
55 | usleep(rand_r(&URCU_TLS(rcu_rand_yield)) % MAX_SLEEP); | |
56 | } | |
57 | ||
58 | static inline void rcu_debug_yield_write(void) | |
59 | { | |
60 | if (rcu_yield_active & RCU_YIELD_WRITE) | |
61 | if (rand_r(&URCU_TLS(rcu_rand_yield)) & 0x1) | |
62 | usleep(rand_r(&URCU_TLS(rcu_rand_yield)) % MAX_SLEEP); | |
63 | } | |
64 | ||
65 | static inline void rcu_debug_yield_enable(unsigned int flags) | |
66 | { | |
67 | rcu_yield_active |= flags; | |
68 | } | |
69 | ||
70 | static inline void rcu_debug_yield_disable(unsigned int flags) | |
71 | { | |
72 | rcu_yield_active &= ~flags; | |
73 | } | |
74 | ||
75 | static inline void rcu_debug_yield_init(void) | |
76 | { | |
77 | URCU_TLS(rcu_rand_yield) = time(NULL) ^ (unsigned long) pthread_self(); | |
78 | } | |
79 | #else /* DEBUG_YIELD */ | |
80 | static inline void rcu_debug_yield_read(void) | |
81 | { | |
82 | } | |
83 | ||
84 | static inline void rcu_debug_yield_write(void) | |
85 | { | |
86 | } | |
87 | ||
88 | static inline void rcu_debug_yield_enable(unsigned int flags) | |
89 | { | |
90 | } | |
91 | ||
92 | static inline void rcu_debug_yield_disable(unsigned int flags) | |
93 | { | |
94 | } | |
95 | ||
96 | static inline void rcu_debug_yield_init(void) | |
97 | { | |
98 | } | |
99 | #endif | |
100 | ||
101 | #endif /* URCU_TESTS_DEBUG_YIELD_H */ |