projects / urcu.git / blame
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|---|---|---|
| 2650042a MD |
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 */ |