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/* cairo - a vector graphics library with display and print output
*
* Copyright © 2002 University of Southern California
* Copyright © 2005,2007 Red Hat, Inc.
* Copyright © 2007 Mathias Hasselmann
*
* This library is free software; you can redistribute it and/or
* modify it either under the terms of the GNU Lesser General Public
* License version 2.1 as published by the Free Software Foundation
* (the "LGPL") or, at your option, under the terms of the Mozilla
* Public License Version 1.1 (the "MPL"). If you do not alter this
* notice, a recipient may use your version of this file under either
* the MPL or the LGPL.
*
* You should have received a copy of the LGPL along with this library
* in the file COPYING-LGPL-2.1; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
* You should have received a copy of the MPL along with this library
* in the file COPYING-MPL-1.1
*
* The contents of this file are subject to the Mozilla Public License
* Version 1.1 (the "License"); you may not use this file except in
* compliance with the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY
* OF ANY KIND, either express or implied. See the LGPL or the MPL for
* the specific language governing rights and limitations.
*
* The Original Code is the cairo graphics library.
*
* The Initial Developer of the Original Code is University of Southern
* California.
*
* Contributor(s):
* Carl D. Worth <cworth@cworth.org>
* Mathias Hasselmann <mathias.hasselmann@gmx.de>
* Behdad Esfahbod <behdad@behdad.org>
*/
#ifndef CAIRO_MUTEX_IMPL_PRIVATE_H
#define CAIRO_MUTEX_IMPL_PRIVATE_H
#include "cairo.h"
#if HAVE_CONFIG_H
#include "config.h"
#endif
#if HAVE_LOCKDEP
#include <lockdep.h>
#endif
/* A fully qualified no-operation statement */
#define CAIRO_MUTEX_IMPL_NOOP do {/*no-op*/} while (0)
/* And one that evaluates its argument once */
#define CAIRO_MUTEX_IMPL_NOOP1(expr) do { (void)(expr); } while (0)
/* Note: 'if (expr) {}' is an alternative to '(void)(expr);' that will 'use' the
* result of __attribute__((warn_used_result)) functions. */
/* Cairo mutex implementation:
*
* Any new mutex implementation needs to do the following:
*
* - Condition on the right header or feature. Headers are
* preferred as eg. you still can use win32 mutex implementation
* on a win32 system even if you do not compile the win32
* surface/backend.
*
* - typedef #cairo_mutex_impl_t to the proper mutex type on your target
* system. Note that you may or may not need to use a pointer,
* depending on what kinds of initialization your mutex
* implementation supports. No trailing semicolon needed.
* You should be able to compile the following snippet (don't try
* running it):
*
* <programlisting>
* cairo_mutex_impl_t _cairo_some_mutex;
* </programlisting>
*
* - #define %CAIRO_MUTEX_IMPL_<NAME> 1 with suitable name for your platform. You
* can later use this symbol in cairo-system.c.
*
* - #define CAIRO_MUTEX_IMPL_LOCK(mutex) and CAIRO_MUTEX_IMPL_UNLOCK(mutex) to
* proper statement to lock/unlock the mutex object passed in.
* You can (and should) assume that the mutex is already
* initialized, and is-not-already-locked/is-locked,
* respectively. Use the "do { ... } while (0)" idiom if necessary.
* No trailing semicolons are needed (in any macro you define here).
* You should be able to compile the following snippet:
*
* <programlisting>
* cairo_mutex_impl_t _cairo_some_mutex;
*
* if (1)
* CAIRO_MUTEX_IMPL_LOCK (_cairo_some_mutex);
* else
* CAIRO_MUTEX_IMPL_UNLOCK (_cairo_some_mutex);
* </programlisting>
*
* - #define %CAIRO_MUTEX_IMPL_NIL_INITIALIZER to something that can
* initialize the #cairo_mutex_impl_t type you defined. Most of the
* time one of 0, %NULL, or {} works. At this point
* you should be able to compile the following snippet:
*
* <programlisting>
* cairo_mutex_impl_t _cairo_some_mutex = CAIRO_MUTEX_IMPL_NIL_INITIALIZER;
*
* if (1)
* CAIRO_MUTEX_IMPL_LOCK (_cairo_some_mutex);
* else
* CAIRO_MUTEX_IMPL_UNLOCK (_cairo_some_mutex);
* </programlisting>
*
* - If the above code is not enough to initialize a mutex on
* your platform, #define CAIRO_MUTEX_IMPL_INIT(mutex) to statement
* to initialize the mutex (allocate resources, etc). Such that
* you should be able to compile AND RUN the following snippet:
*
* <programlisting>
* cairo_mutex_impl_t _cairo_some_mutex = CAIRO_MUTEX_IMPL_NIL_INITIALIZER;
*
* CAIRO_MUTEX_IMPL_INIT (_cairo_some_mutex);
*
* if (1)
* CAIRO_MUTEX_IMPL_LOCK (_cairo_some_mutex);
* else
* CAIRO_MUTEX_IMPL_UNLOCK (_cairo_some_mutex);
* </programlisting>
*
* - If you define CAIRO_MUTEX_IMPL_INIT(mutex), cairo will use it to
* initialize all static mutex'es. If for any reason that should
* not happen (eg. %CAIRO_MUTEX_IMPL_INIT is just a faster way than
* what cairo does using %CAIRO_MUTEX_IMPL_NIL_INITIALIZER), then
* <programlisting>
* #define CAIRO_MUTEX_IMPL_INITIALIZE() CAIRO_MUTEX_IMPL_NOOP
* </programlisting>
*
* - If your system supports freeing a mutex object (deallocating
* resources, etc), then #define CAIRO_MUTEX_IMPL_FINI(mutex) to do
* that.
*
* - If you define CAIRO_MUTEX_IMPL_FINI(mutex), cairo will use it to
* define a finalizer function to finalize all static mutex'es.
* However, it's up to you to call CAIRO_MUTEX_IMPL_FINALIZE() at
* proper places, eg. when the system is unloading the cairo library.
* So, if for any reason finalizing static mutex'es is not needed
* (eg. you never call CAIRO_MUTEX_IMPL_FINALIZE()), then
* <programlisting>
* #define CAIRO_MUTEX_IMPL_FINALIZE() CAIRO_MUTEX_IMPL_NOOP
* </programlisting>
*
* - That is all. If for any reason you think the above API is
* not enough to implement #cairo_mutex_impl_t on your system, please
* stop and write to the cairo mailing list about it. DO NOT
* poke around cairo-mutex-private.h for possible solutions.
*/
#if CAIRO_NO_MUTEX
/* No mutexes */
typedef int cairo_mutex_impl_t;
# define CAIRO_MUTEX_IMPL_NO 1
# define CAIRO_MUTEX_IMPL_INITIALIZE() CAIRO_MUTEX_IMPL_NOOP
# define CAIRO_MUTEX_IMPL_LOCK(mutex) CAIRO_MUTEX_IMPL_NOOP1(mutex)
# define CAIRO_MUTEX_IMPL_UNLOCK(mutex) CAIRO_MUTEX_IMPL_NOOP1(mutex)
# define CAIRO_MUTEX_IMPL_NIL_INITIALIZER 0
#elif HAVE_PTHREAD_H /*******************************************************/
# include <pthread.h>
typedef pthread_mutex_t cairo_mutex_impl_t;
# define CAIRO_MUTEX_IMPL_PTHREAD 1
#if HAVE_LOCKDEP
/* expose all mutexes to the validator */
# define CAIRO_MUTEX_IMPL_INIT(mutex) pthread_mutex_init (&(mutex), NULL)
#endif
# define CAIRO_MUTEX_IMPL_LOCK(mutex) pthread_mutex_lock (&(mutex))
# define CAIRO_MUTEX_IMPL_UNLOCK(mutex) pthread_mutex_unlock (&(mutex))
#if HAVE_LOCKDEP
# define CAIRO_MUTEX_IS_LOCKED(mutex) LOCKDEP_IS_LOCKED (&(mutex))
# define CAIRO_MUTEX_IS_UNLOCKED(mutex) LOCKDEP_IS_UNLOCKED (&(mutex))
#endif
# define CAIRO_MUTEX_IMPL_FINI(mutex) pthread_mutex_destroy (&(mutex))
#if ! HAVE_LOCKDEP
# define CAIRO_MUTEX_IMPL_FINALIZE() CAIRO_MUTEX_IMPL_NOOP
#endif
# define CAIRO_MUTEX_IMPL_NIL_INITIALIZER PTHREAD_MUTEX_INITIALIZER
#elif defined(HAVE_WINDOWS_H) || defined(_MSC_VER) /*************************/
# include <windows.h>
typedef CRITICAL_SECTION cairo_mutex_impl_t;
# define CAIRO_MUTEX_IMPL_WIN32 1
# define CAIRO_MUTEX_IMPL_LOCK(mutex) EnterCriticalSection (&(mutex))
# define CAIRO_MUTEX_IMPL_UNLOCK(mutex) LeaveCriticalSection (&(mutex))
# define CAIRO_MUTEX_IMPL_INIT(mutex) InitializeCriticalSection (&(mutex))
# define CAIRO_MUTEX_IMPL_FINI(mutex) DeleteCriticalSection (&(mutex))
# define CAIRO_MUTEX_IMPL_NIL_INITIALIZER { NULL, 0, 0, NULL, NULL, 0 }
#elif defined __OS2__ /******************************************************/
# define INCL_BASE
# define INCL_PM
# include <os2.h>
typedef HMTX cairo_mutex_impl_t;
# define CAIRO_MUTEX_IMPL_OS2 1
# define CAIRO_MUTEX_IMPL_LOCK(mutex) DosRequestMutexSem(mutex, SEM_INDEFINITE_WAIT)
# define CAIRO_MUTEX_IMPL_UNLOCK(mutex) DosReleaseMutexSem(mutex)
# define CAIRO_MUTEX_IMPL_INIT(mutex) DosCreateMutexSem (NULL, &(mutex), 0L, FALSE)
# define CAIRO_MUTEX_IMPL_FINI(mutex) DosCloseMutexSem (mutex)
# define CAIRO_MUTEX_IMPL_NIL_INITIALIZER 0
#elif CAIRO_HAS_BEOS_SURFACE /***********************************************/
typedef BLocker* cairo_mutex_impl_t;
# define CAIRO_MUTEX_IMPL_BEOS 1
# define CAIRO_MUTEX_IMPL_LOCK(mutex) (mutex)->Lock()
# define CAIRO_MUTEX_IMPL_UNLOCK(mutex) (mutex)->Unlock()
# define CAIRO_MUTEX_IMPL_INIT(mutex) (mutex) = new BLocker()
# define CAIRO_MUTEX_IMPL_FINI(mutex) delete (mutex)
# define CAIRO_MUTEX_IMPL_NIL_INITIALIZER NULL
#else /**********************************************************************/
# error "XXX: No mutex implementation found. Cairo will not work with multiple threads. Define CAIRO_NO_MUTEX to 1 to acknowledge and accept this limitation and compile cairo without thread-safety support."
#endif
#endif
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