forked from KolibriOS/kolibrios
279 lines
10 KiB
C
279 lines
10 KiB
C
/* cairo - a vector graphics library with display and print output
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*
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* Copyright © 2002 University of Southern California
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* Copyright © 2005,2007 Red Hat, Inc.
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* Copyright © 2007 Mathias Hasselmann
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*
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* This library is free software; you can redistribute it and/or
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* modify it either under the terms of the GNU Lesser General Public
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* License version 2.1 as published by the Free Software Foundation
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* (the "LGPL") or, at your option, under the terms of the Mozilla
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* Public License Version 1.1 (the "MPL"). If you do not alter this
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* notice, a recipient may use your version of this file under either
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* the MPL or the LGPL.
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*
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* You should have received a copy of the LGPL along with this library
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* in the file COPYING-LGPL-2.1; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Suite 500, Boston, MA 02110-1335, USA
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* You should have received a copy of the MPL along with this library
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* in the file COPYING-MPL-1.1
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*
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* The contents of this file are subject to the Mozilla Public License
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* Version 1.1 (the "License"); you may not use this file except in
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* compliance with the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY
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* OF ANY KIND, either express or implied. See the LGPL or the MPL for
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* the specific language governing rights and limitations.
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*
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* The Original Code is the cairo graphics library.
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*
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* The Initial Developer of the Original Code is University of Southern
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* California.
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*
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* Contributor(s):
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* Carl D. Worth <cworth@cworth.org>
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* Mathias Hasselmann <mathias.hasselmann@gmx.de>
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* Behdad Esfahbod <behdad@behdad.org>
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*/
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#ifndef CAIRO_MUTEX_IMPL_PRIVATE_H
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#define CAIRO_MUTEX_IMPL_PRIVATE_H
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#include "cairo.h"
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#if HAVE_CONFIG_H
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#include "config.h"
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#endif
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#if HAVE_LOCKDEP
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#include <lockdep.h>
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#endif
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/* A fully qualified no-operation statement */
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#define CAIRO_MUTEX_IMPL_NOOP do {/*no-op*/} while (0)
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/* And one that evaluates its argument once */
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#define CAIRO_MUTEX_IMPL_NOOP1(expr) do { (void)(expr); } while (0)
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/* Note: 'if (expr) {}' is an alternative to '(void)(expr);' that will 'use' the
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* result of __attribute__((warn_used_result)) functions. */
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/* Cairo mutex implementation:
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*
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* Any new mutex implementation needs to do the following:
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*
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* - Condition on the right header or feature. Headers are
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* preferred as eg. you still can use win32 mutex implementation
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* on a win32 system even if you do not compile the win32
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* surface/backend.
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*
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* - typedef #cairo_mutex_impl_t to the proper mutex type on your target
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* system. Note that you may or may not need to use a pointer,
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* depending on what kinds of initialization your mutex
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* implementation supports. No trailing semicolon needed.
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* You should be able to compile the following snippet (don't try
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* running it):
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*
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* <programlisting>
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* cairo_mutex_impl_t _cairo_some_mutex;
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* </programlisting>
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*
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* - #define %CAIRO_MUTEX_IMPL_<NAME> 1 with suitable name for your platform. You
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* can later use this symbol in cairo-system.c.
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*
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* - #define CAIRO_MUTEX_IMPL_LOCK(mutex) and CAIRO_MUTEX_IMPL_UNLOCK(mutex) to
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* proper statement to lock/unlock the mutex object passed in.
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* You can (and should) assume that the mutex is already
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* initialized, and is-not-already-locked/is-locked,
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* respectively. Use the "do { ... } while (0)" idiom if necessary.
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* No trailing semicolons are needed (in any macro you define here).
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* You should be able to compile the following snippet:
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*
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* <programlisting>
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* cairo_mutex_impl_t _cairo_some_mutex;
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*
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* if (1)
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* CAIRO_MUTEX_IMPL_LOCK (_cairo_some_mutex);
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* else
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* CAIRO_MUTEX_IMPL_UNLOCK (_cairo_some_mutex);
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* </programlisting>
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*
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* - #define %CAIRO_MUTEX_IMPL_NIL_INITIALIZER to something that can
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* initialize the #cairo_mutex_impl_t type you defined. Most of the
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* time one of 0, %NULL, or {} works. At this point
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* you should be able to compile the following snippet:
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*
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* <programlisting>
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* cairo_mutex_impl_t _cairo_some_mutex = CAIRO_MUTEX_IMPL_NIL_INITIALIZER;
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*
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* if (1)
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* CAIRO_MUTEX_IMPL_LOCK (_cairo_some_mutex);
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* else
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* CAIRO_MUTEX_IMPL_UNLOCK (_cairo_some_mutex);
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* </programlisting>
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*
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* - If the above code is not enough to initialize a mutex on
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* your platform, #define CAIRO_MUTEX_IMPL_INIT(mutex) to statement
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* to initialize the mutex (allocate resources, etc). Such that
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* you should be able to compile AND RUN the following snippet:
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*
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* <programlisting>
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* cairo_mutex_impl_t _cairo_some_mutex = CAIRO_MUTEX_IMPL_NIL_INITIALIZER;
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*
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* CAIRO_MUTEX_IMPL_INIT (_cairo_some_mutex);
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*
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* if (1)
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* CAIRO_MUTEX_IMPL_LOCK (_cairo_some_mutex);
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* else
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* CAIRO_MUTEX_IMPL_UNLOCK (_cairo_some_mutex);
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* </programlisting>
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*
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* - If you define CAIRO_MUTEX_IMPL_INIT(mutex), cairo will use it to
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* initialize all static mutex'es. If for any reason that should
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* not happen (eg. %CAIRO_MUTEX_IMPL_INIT is just a faster way than
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* what cairo does using %CAIRO_MUTEX_IMPL_NIL_INITIALIZER), then
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* <programlisting>
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* #define CAIRO_MUTEX_IMPL_INITIALIZE() CAIRO_MUTEX_IMPL_NOOP
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* </programlisting>
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*
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* - If your system supports freeing a mutex object (deallocating
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* resources, etc), then #define CAIRO_MUTEX_IMPL_FINI(mutex) to do
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* that.
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*
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* - If you define CAIRO_MUTEX_IMPL_FINI(mutex), cairo will use it to
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* define a finalizer function to finalize all static mutex'es.
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* However, it's up to you to call CAIRO_MUTEX_IMPL_FINALIZE() at
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* proper places, eg. when the system is unloading the cairo library.
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* So, if for any reason finalizing static mutex'es is not needed
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* (eg. you never call CAIRO_MUTEX_IMPL_FINALIZE()), then
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* <programlisting>
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* #define CAIRO_MUTEX_IMPL_FINALIZE() CAIRO_MUTEX_IMPL_NOOP
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* </programlisting>
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*
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* - That is all. If for any reason you think the above API is
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* not enough to implement #cairo_mutex_impl_t on your system, please
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* stop and write to the cairo mailing list about it. DO NOT
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* poke around cairo-mutex-private.h for possible solutions.
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*/
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#if CAIRO_NO_MUTEX
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/* No mutexes */
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typedef int cairo_mutex_impl_t;
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# define CAIRO_MUTEX_IMPL_NO 1
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# define CAIRO_MUTEX_IMPL_INITIALIZE() CAIRO_MUTEX_IMPL_NOOP
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# define CAIRO_MUTEX_IMPL_LOCK(mutex) CAIRO_MUTEX_IMPL_NOOP1(mutex)
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# define CAIRO_MUTEX_IMPL_UNLOCK(mutex) CAIRO_MUTEX_IMPL_NOOP1(mutex)
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# define CAIRO_MUTEX_IMPL_NIL_INITIALIZER 0
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# define CAIRO_MUTEX_HAS_RECURSIVE_IMPL 1
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typedef int cairo_recursive_mutex_impl_t;
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# define CAIRO_RECURSIVE_MUTEX_IMPL_INIT(mutex)
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# define CAIRO_RECURSIVE_MUTEX_IMPL_NIL_INITIALIZER 0
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#elif defined(_WIN32) /******************************************************/
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#define WIN32_LEAN_AND_MEAN
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/* We require Windows 2000 features such as ETO_PDY */
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#if !defined(WINVER) || (WINVER < 0x0500)
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# define WINVER 0x0500
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#endif
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#if !defined(_WIN32_WINNT) || (_WIN32_WINNT < 0x0500)
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# define _WIN32_WINNT 0x0500
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#endif
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# include <windows.h>
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typedef CRITICAL_SECTION cairo_mutex_impl_t;
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# define CAIRO_MUTEX_IMPL_WIN32 1
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# define CAIRO_MUTEX_IMPL_LOCK(mutex) EnterCriticalSection (&(mutex))
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# define CAIRO_MUTEX_IMPL_UNLOCK(mutex) LeaveCriticalSection (&(mutex))
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# define CAIRO_MUTEX_IMPL_INIT(mutex) InitializeCriticalSection (&(mutex))
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# define CAIRO_MUTEX_IMPL_FINI(mutex) DeleteCriticalSection (&(mutex))
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# define CAIRO_MUTEX_IMPL_NIL_INITIALIZER { NULL, 0, 0, NULL, NULL, 0 }
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#elif defined __OS2__ /******************************************************/
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# define INCL_BASE
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# define INCL_PM
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# include <os2.h>
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typedef HMTX cairo_mutex_impl_t;
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# define CAIRO_MUTEX_IMPL_OS2 1
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# define CAIRO_MUTEX_IMPL_LOCK(mutex) DosRequestMutexSem(mutex, SEM_INDEFINITE_WAIT)
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# define CAIRO_MUTEX_IMPL_UNLOCK(mutex) DosReleaseMutexSem(mutex)
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# define CAIRO_MUTEX_IMPL_INIT(mutex) DosCreateMutexSem (NULL, &(mutex), 0L, FALSE)
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# define CAIRO_MUTEX_IMPL_FINI(mutex) DosCloseMutexSem (mutex)
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# define CAIRO_MUTEX_IMPL_NIL_INITIALIZER 0
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#elif CAIRO_HAS_BEOS_SURFACE /***********************************************/
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typedef BLocker* cairo_mutex_impl_t;
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# define CAIRO_MUTEX_IMPL_BEOS 1
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# define CAIRO_MUTEX_IMPL_LOCK(mutex) (mutex)->Lock()
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# define CAIRO_MUTEX_IMPL_UNLOCK(mutex) (mutex)->Unlock()
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# define CAIRO_MUTEX_IMPL_INIT(mutex) (mutex) = new BLocker()
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# define CAIRO_MUTEX_IMPL_FINI(mutex) delete (mutex)
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# define CAIRO_MUTEX_IMPL_NIL_INITIALIZER NULL
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#elif CAIRO_HAS_PTHREAD /* and finally if there are no native mutexes ********/
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# include <pthread.h>
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typedef pthread_mutex_t cairo_mutex_impl_t;
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typedef pthread_mutex_t cairo_recursive_mutex_impl_t;
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# define CAIRO_MUTEX_IMPL_PTHREAD 1
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#if HAVE_LOCKDEP
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/* expose all mutexes to the validator */
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# define CAIRO_MUTEX_IMPL_INIT(mutex) pthread_mutex_init (&(mutex), NULL)
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#endif
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# define CAIRO_MUTEX_IMPL_LOCK(mutex) pthread_mutex_lock (&(mutex))
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# define CAIRO_MUTEX_IMPL_UNLOCK(mutex) pthread_mutex_unlock (&(mutex))
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#if HAVE_LOCKDEP
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# define CAIRO_MUTEX_IS_LOCKED(mutex) LOCKDEP_IS_LOCKED (&(mutex))
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# define CAIRO_MUTEX_IS_UNLOCKED(mutex) LOCKDEP_IS_UNLOCKED (&(mutex))
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#endif
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# define CAIRO_MUTEX_IMPL_FINI(mutex) pthread_mutex_destroy (&(mutex))
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#if ! HAVE_LOCKDEP
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# define CAIRO_MUTEX_IMPL_FINALIZE() CAIRO_MUTEX_IMPL_NOOP
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#endif
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# define CAIRO_MUTEX_IMPL_NIL_INITIALIZER PTHREAD_MUTEX_INITIALIZER
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# define CAIRO_MUTEX_HAS_RECURSIVE_IMPL 1
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# define CAIRO_RECURSIVE_MUTEX_IMPL_INIT(mutex) do { \
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pthread_mutexattr_t attr; \
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pthread_mutexattr_init (&attr); \
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pthread_mutexattr_settype (&attr, PTHREAD_MUTEX_RECURSIVE); \
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pthread_mutex_init (&(mutex), &attr); \
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pthread_mutexattr_destroy (&attr); \
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} while (0)
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# define CAIRO_RECURSIVE_MUTEX_IMPL_NIL_INITIALIZER PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP
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#else /**********************************************************************/
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# 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."
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#endif
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/* By default mutex implementations are assumed to be recursive */
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#if ! CAIRO_MUTEX_HAS_RECURSIVE_IMPL
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# define CAIRO_MUTEX_HAS_RECURSIVE_IMPL 1
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typedef cairo_mutex_impl_t cairo_recursive_mutex_impl_t;
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# define CAIRO_RECURSIVE_MUTEX_IMPL_INIT(mutex) CAIRO_MUTEX_IMPL_INIT(mutex)
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# define CAIRO_RECURSIVE_MUTEX_IMPL_NIL_INITIALIZER CAIRO_MUTEX_IMPL_NIL_INITIALIZER
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#endif
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#endif
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