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/*
* OpenVPN -- An application to securely tunnel IP networks
* over a single UDP port, with support for SSL/TLS-based
* session authentication and key exchange,
* packet encryption, packet authentication, and
* packet compression.
*
* Copyright (C) 2002-2008 OpenVPN Solutions LLC <info@openvpn.net>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2
* as published by the Free Software Foundation.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program (see the file COPYING included with this
* distribution); if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#ifndef THREAD_H
#define THREAD_H
#include "basic.h"
#include "common.h"
/*
* OpenVPN static mutex locks, by mutex type
*/
#define L_UNUSED 0
#define L_CTIME 1
#define L_INET_NTOA 2
#define L_MSG 3
#define L_STRERR 4
#define L_PUTENV 5
#define L_PRNG 6
#define L_GETTIMEOFDAY 7
#define L_ENV_SET 8
#define L_SYSTEM 9
#define L_CREATE_TEMP 10
#define L_PLUGIN 11
#define N_MUTEXES 12
#ifdef USE_PTHREAD
#define MAX_THREADS 50
#define CACHE_LINE_SIZE 128
/*
* Improve SMP performance by making sure that each
* mutex resides in its own cache line.
*/
struct sparse_mutex
{
pthread_mutex_t mutex;
uint8_t dummy [CACHE_LINE_SIZE - sizeof (pthread_mutex_t)];
};
typedef pthread_t openvpn_thread_t;
extern bool pthread_initialized;
extern struct sparse_mutex mutex_array[N_MUTEXES];
#define MUTEX_DEFINE(lock) pthread_mutex_t lock
#define MUTEX_PTR_DEFINE(lock) pthread_mutex_t *lock
static inline bool
openvpn_thread_enabled (void)
{
return pthread_initialized;
}
static inline openvpn_thread_t
openvpn_thread_self (void)
{
return pthread_initialized ? pthread_self() : 0;
}
static inline void
mutex_init (pthread_mutex_t *mutex)
{
if (mutex)
pthread_mutex_init (mutex, NULL);
}
static inline void
mutex_destroy (pthread_mutex_t *mutex)
{
if (mutex)
pthread_mutex_destroy (mutex);
}
static inline void
mutex_lock (pthread_mutex_t *mutex)
{
if (pthread_initialized && mutex)
pthread_mutex_lock (mutex);
}
static inline bool
mutex_trylock (pthread_mutex_t *mutex)
{
if (pthread_initialized && mutex)
return pthread_mutex_trylock (mutex) == 0;
else
return true;
}
static inline void
mutex_unlock (pthread_mutex_t *mutex)
{
if (pthread_initialized && mutex)
{
pthread_mutex_unlock (mutex);
#if 1 /* JYFIXME: if race conditions exist, make them more likely to occur */
sleep (0);
#endif
}
}
static inline void
mutex_cycle (pthread_mutex_t *mutex)
{
if (pthread_initialized && mutex)
{
pthread_mutex_unlock (mutex);
sleep (0);
pthread_mutex_lock (mutex);
}
}
static inline void
mutex_lock_static (int type)
{
mutex_lock (&mutex_array[type].mutex);
}
static inline void
mutex_unlock_static (int type)
{
mutex_unlock (&mutex_array[type].mutex);
}
static inline void
mutex_cycle_static (int type)
{
mutex_cycle (&mutex_array[type].mutex);
}
void openvpn_thread_init (void);
void openvpn_thread_cleanup (void);
openvpn_thread_t openvpn_thread_create (void *(*start_routine) (void *), void* arg);
void openvpn_thread_join (openvpn_thread_t id);
#else /* USE_PTHREAD */
typedef int openvpn_thread_t;
#if defined(_MSC_VER) || PEDANTIC
#define MUTEX_DEFINE(lock) int eat_semicolon
#define MUTEX_PTR_DEFINE(lock) int eat_semicolon
#else
#define MUTEX_DEFINE(lock)
#define MUTEX_PTR_DEFINE(lock)
#endif
#define mutex_init(m)
#define mutex_destroy(m)
#define mutex_lock(m)
#define mutex_trylock(m) (true)
#define mutex_unlock(m)
#define mutex_cycle(m)
static inline bool
openvpn_thread_enabled (void)
{
return false;
}
static inline openvpn_thread_t
openvpn_thread_self (void)
{
return 0;
}
static inline void
openvpn_thread_init (void)
{
}
static inline void
openvpn_thread_cleanup (void)
{
}
static inline openvpn_thread_t
openvpn_thread_create (void *(*start_routine) (void *), void* arg)
{
return 0;
}
static inline void
work_thread_join (openvpn_thread_t id)
{
}
static inline void
mutex_lock_static (int type)
{
}
static inline void
mutex_unlock_static (int type)
{
}
static inline void
mutex_cycle_static (int type)
{
}
#endif /* USE_PTHREAD */
#endif /* THREAD_H */
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