projects / userspace-rcu.git / blame
| Commit | Line | Data |
|---|---|---|
| ce29b371 MJ |
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 | ||
| 25 | /* | |
| 26 | * Updates with RCU_SIGNAL are much slower. Account this in the delay. | |
| 27 | */ | |
| 28 | #ifdef RCU_SIGNAL | |
| 29 | /* maximum sleep delay, in us */ | |
| 30 | #define MAX_SLEEP 30000 | |
| 31 | #else | |
| 32 | #define MAX_SLEEP 50 | |
| 33 | #endif | |
| 34 | ||
| 35 | extern unsigned int rcu_yield_active; | |
| 36 | extern DECLARE_URCU_TLS(unsigned int, rcu_rand_yield); | |
| 37 | ||
| 38 | #ifdef DEBUG_YIELD | |
| 39 | static inline void rcu_debug_yield_read(void) | |
| 40 | { | |
| 41 | if (rcu_yield_active & RCU_YIELD_READ) | |
| 42 | if (rand_r(&URCU_TLS(rcu_rand_yield)) & 0x1) | |
| 43 | usleep(rand_r(&URCU_TLS(rcu_rand_yield)) % MAX_SLEEP); | |
| 44 | } | |
| 45 | ||
| 46 | static inline void rcu_debug_yield_write(void) | |
| 47 | { | |
| 48 | if (rcu_yield_active & RCU_YIELD_WRITE) | |
| 49 | if (rand_r(&URCU_TLS(rcu_rand_yield)) & 0x1) | |
| 50 | usleep(rand_r(&URCU_TLS(rcu_rand_yield)) % MAX_SLEEP); | |
| 51 | } | |
| 52 | ||
| 53 | static inline void rcu_debug_yield_enable(unsigned int flags) | |
| 54 | { | |
| 55 | rcu_yield_active |= flags; | |
| 56 | } | |
| 57 | ||
| 58 | static inline void rcu_debug_yield_disable(unsigned int flags) | |
| 59 | { | |
| 60 | rcu_yield_active &= ~flags; | |
| 61 | } | |
| 62 | ||
| 63 | static inline void rcu_debug_yield_init(void) | |
| 64 | { | |
| 65 | URCU_TLS(rcu_rand_yield) = time(NULL) ^ (unsigned long) pthread_self(); | |
| 66 | } | |
| 67 | #else /* DEBUG_YIELD */ | |
| 68 | static inline void rcu_debug_yield_read(void) | |
| 69 | { | |
| 70 | } | |
| 71 | ||
| 72 | static inline void rcu_debug_yield_write(void) | |
| 73 | { | |
| 74 | } | |
| 75 | ||
| 70469b43 MJ |
76 | static inline void rcu_debug_yield_enable( |
| 77 | unsigned int flags __attribute__((unused))) | |
| 2650042a MD |
78 | { |
| 79 | } | |
| 80 | ||
| 70469b43 MJ |
81 | static inline void rcu_debug_yield_disable( |
| 82 | unsigned int flags __attribute__((unused))) | |
| 2650042a MD |
83 | { |
| 84 | } | |
| 85 | ||
| 86 | static inline void rcu_debug_yield_init(void) | |
| 87 | { | |
| 88 | } | |
| 89 | #endif | |
| 90 | ||
| 91 | #endif /* URCU_TESTS_DEBUG_YIELD_H */ |