104 lines
2.6 KiB
C
104 lines
2.6 KiB
C
#ifndef URCU_TESTS_DEBUG_YIELD_H
|
|
#define URCU_TESTS_DEBUG_YIELD_H
|
|
|
|
/*
|
|
* debug-yield.h
|
|
*
|
|
* Userspace RCU library tests - Debugging header
|
|
*
|
|
* Copyright (c) 2009 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
|
|
* Copyright (c) 2009 Paul E. McKenney, IBM Corporation.
|
|
*
|
|
* This library is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2.1 of the License, or (at your option) any later version.
|
|
*
|
|
* This library is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with this library; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*
|
|
* IBM's contributions to this file may be relicensed under LGPLv2 or later.
|
|
*/
|
|
|
|
#include <sched.h>
|
|
#include <time.h>
|
|
#include <pthread.h>
|
|
#include <unistd.h>
|
|
|
|
#include <compat-rand.h>
|
|
|
|
#define RCU_YIELD_READ (1 << 0)
|
|
#define RCU_YIELD_WRITE (1 << 1)
|
|
|
|
/*
|
|
* Updates with RCU_SIGNAL are much slower. Account this in the delay.
|
|
*/
|
|
#ifdef RCU_SIGNAL
|
|
/* maximum sleep delay, in us */
|
|
#define MAX_SLEEP 30000
|
|
#else
|
|
#define MAX_SLEEP 50
|
|
#endif
|
|
|
|
extern unsigned int rcu_yield_active;
|
|
extern DECLARE_URCU_TLS(unsigned int, rcu_rand_yield);
|
|
|
|
#ifdef DEBUG_YIELD
|
|
static inline void rcu_debug_yield_read(void)
|
|
{
|
|
if (rcu_yield_active & RCU_YIELD_READ)
|
|
if (rand_r(&URCU_TLS(rcu_rand_yield)) & 0x1)
|
|
usleep(rand_r(&URCU_TLS(rcu_rand_yield)) % MAX_SLEEP);
|
|
}
|
|
|
|
static inline void rcu_debug_yield_write(void)
|
|
{
|
|
if (rcu_yield_active & RCU_YIELD_WRITE)
|
|
if (rand_r(&URCU_TLS(rcu_rand_yield)) & 0x1)
|
|
usleep(rand_r(&URCU_TLS(rcu_rand_yield)) % MAX_SLEEP);
|
|
}
|
|
|
|
static inline void rcu_debug_yield_enable(unsigned int flags)
|
|
{
|
|
rcu_yield_active |= flags;
|
|
}
|
|
|
|
static inline void rcu_debug_yield_disable(unsigned int flags)
|
|
{
|
|
rcu_yield_active &= ~flags;
|
|
}
|
|
|
|
static inline void rcu_debug_yield_init(void)
|
|
{
|
|
URCU_TLS(rcu_rand_yield) = time(NULL) ^ (unsigned long) pthread_self();
|
|
}
|
|
#else /* DEBUG_YIELD */
|
|
static inline void rcu_debug_yield_read(void)
|
|
{
|
|
}
|
|
|
|
static inline void rcu_debug_yield_write(void)
|
|
{
|
|
}
|
|
|
|
static inline void rcu_debug_yield_enable(unsigned int flags)
|
|
{
|
|
}
|
|
|
|
static inline void rcu_debug_yield_disable(unsigned int flags)
|
|
{
|
|
}
|
|
|
|
static inline void rcu_debug_yield_init(void)
|
|
{
|
|
}
|
|
#endif
|
|
|
|
#endif /* URCU_TESTS_DEBUG_YIELD_H */
|