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1 | // SPDX-FileCopyrightText: 2009 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
2 | // SPDX-FileCopyrightText: 2009 Paul E. McKenney, IBM Corporation. | |
3 | // | |
4 | // SPDX-License-Identifier: LGPL-2.1-or-later | |
5 | ||
2650042a MD |
6 | #ifndef URCU_TESTS_DEBUG_YIELD_H |
7 | #define URCU_TESTS_DEBUG_YIELD_H | |
8 | ||
9 | /* | |
2650042a MD |
10 | * Userspace RCU library tests - Debugging header |
11 | * | |
2650042a MD |
12 | * IBM's contributions to this file may be relicensed under LGPLv2 or later. |
13 | */ | |
14 | ||
15 | #include <sched.h> | |
16 | #include <time.h> | |
17 | #include <pthread.h> | |
18 | #include <unistd.h> | |
19 | ||
094c8c59 MJ |
20 | #include <compat-rand.h> |
21 | ||
2650042a MD |
22 | #define RCU_YIELD_READ (1 << 0) |
23 | #define RCU_YIELD_WRITE (1 << 1) | |
24 | ||
2650042a | 25 | #define MAX_SLEEP 50 |
2650042a MD |
26 | |
27 | extern unsigned int rcu_yield_active; | |
28 | extern DECLARE_URCU_TLS(unsigned int, rcu_rand_yield); | |
29 | ||
30 | #ifdef DEBUG_YIELD | |
31 | static inline void rcu_debug_yield_read(void) | |
32 | { | |
33 | if (rcu_yield_active & RCU_YIELD_READ) | |
34 | if (rand_r(&URCU_TLS(rcu_rand_yield)) & 0x1) | |
35 | usleep(rand_r(&URCU_TLS(rcu_rand_yield)) % MAX_SLEEP); | |
36 | } | |
37 | ||
38 | static inline void rcu_debug_yield_write(void) | |
39 | { | |
40 | if (rcu_yield_active & RCU_YIELD_WRITE) | |
41 | if (rand_r(&URCU_TLS(rcu_rand_yield)) & 0x1) | |
42 | usleep(rand_r(&URCU_TLS(rcu_rand_yield)) % MAX_SLEEP); | |
43 | } | |
44 | ||
45 | static inline void rcu_debug_yield_enable(unsigned int flags) | |
46 | { | |
47 | rcu_yield_active |= flags; | |
48 | } | |
49 | ||
50 | static inline void rcu_debug_yield_disable(unsigned int flags) | |
51 | { | |
52 | rcu_yield_active &= ~flags; | |
53 | } | |
54 | ||
55 | static inline void rcu_debug_yield_init(void) | |
56 | { | |
57 | URCU_TLS(rcu_rand_yield) = time(NULL) ^ (unsigned long) pthread_self(); | |
58 | } | |
59 | #else /* DEBUG_YIELD */ | |
60 | static inline void rcu_debug_yield_read(void) | |
61 | { | |
62 | } | |
63 | ||
64 | static inline void rcu_debug_yield_write(void) | |
65 | { | |
66 | } | |
67 | ||
70469b43 MJ |
68 | static inline void rcu_debug_yield_enable( |
69 | unsigned int flags __attribute__((unused))) | |
2650042a MD |
70 | { |
71 | } | |
72 | ||
70469b43 MJ |
73 | static inline void rcu_debug_yield_disable( |
74 | unsigned int flags __attribute__((unused))) | |
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75 | { |
76 | } | |
77 | ||
78 | static inline void rcu_debug_yield_init(void) | |
79 | { | |
80 | } | |
81 | #endif | |
82 | ||
83 | #endif /* URCU_TESTS_DEBUG_YIELD_H */ |