/usr/include/kannel/gwlib/thread.h is in kannel-dev 1.4.4-5.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* The Kannel Software License, Version 1.0
*
* Copyright (c) 2001-2014 Kannel Group
* Copyright (c) 1998-2001 WapIT Ltd.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The end-user documentation included with the redistribution,
* if any, must include the following acknowledgment:
* "This product includes software developed by the
* Kannel Group (http://www.kannel.org/)."
* Alternately, this acknowledgment may appear in the software itself,
* if and wherever such third-party acknowledgments normally appear.
*
* 4. The names "Kannel" and "Kannel Group" must not be used to
* endorse or promote products derived from this software without
* prior written permission. For written permission, please
* contact org@kannel.org.
*
* 5. Products derived from this software may not be called "Kannel",
* nor may "Kannel" appear in their name, without prior written
* permission of the Kannel Group.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE KANNEL GROUP OR ITS CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
* OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
* OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Kannel Group. For more information on
* the Kannel Group, please see <http://www.kannel.org/>.
*
* Portions of this software are based upon software originally written at
* WapIT Ltd., Helsinki, Finland for the Kannel project.
*/
/*
* thread.h - thread manipulation
*/
#ifndef GW_THREAD_H
#define GW_THREAD_H
#include "gw-config.h"
#if !HAVE_PTHREAD_H
#error "You need POSIX.1 threads and <pthread.h> header file"
#endif
#include <pthread.h>
/*
* Wrapper around pthread_mutex_t to avoid problems with recursive calls
* to pthread_mutex_trylock on Linux (at least).
*/
typedef struct {
pthread_mutex_t mutex;
long owner;
int dynamic;
#ifdef MUTEX_STATS
unsigned char *filename;
int lineno;
long locks;
long collisions;
#endif
} Mutex;
/*
* Create a Mutex.
*/
#ifdef MUTEX_STATS
#define mutex_create() gw_claim_area(mutex_create_measured(mutex_create_real(), \
__FILE__, __LINE__))
#else
#define mutex_create() gw_claim_area(mutex_create_real())
#endif
/*
* Create a Mutex. Call these functions via the macro defined above.
*/
Mutex *mutex_create_measured(Mutex *mutex, char *filename, int lineno);
Mutex *mutex_create_real(void);
/*
* Initialize a statically allocated Mutex. We need those inside gwlib
* modules that are in turn used by the mutex wrapper, such as "gwmem" and
* "protected".
*/
#ifdef MUTEX_STATS
#define mutex_init_static(mutex) \
mutex_create_measured(mutex_init_static_real(mutex), __FILE__, __LINE__)
#else
#define mutex_init_static(mutex) \
mutex_init_static_real(mutex)
#endif
Mutex *mutex_init_static_real(Mutex *mutex);
/*
* Destroy a Mutex.
*/
void mutex_destroy(Mutex *mutex);
/* lock given mutex. PANIC if fails (non-initialized mutex or other
* coding error) */
#define mutex_lock(m) mutex_lock_real(m, __FILE__, __LINE__, __func__)
void mutex_lock_real(Mutex *mutex, char *file, int line, const char *func);
/* unlock given mutex, PANIC if fails (so do not call for non-locked) */
/* returns 0 if ok 1 if failure for debugging */
#define mutex_unlock(m) mutex_unlock_real(m, __FILE__, __LINE__, __func__)
int mutex_unlock_real(Mutex *mutex, char *file, int line, const char *func);
/*
* Try to lock given mutex, returns -1 if mutex is NULL; 0 if mutex acquired; otherwise
* EBUSY. PANIC if mutex was not properly initialized before.
*/
#define mutex_trylock(m) mutex_trylock_real(m, __FILE__, __LINE__, __func__)
int mutex_trylock_real(Mutex *mutex, const char *file, int line, const char *func);
#endif
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