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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., 51 Franklin Street, Suite 500, Boston, MA 02110-1335, 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
+
+# define CAIRO_MUTEX_HAS_RECURSIVE_IMPL 1
+
+  typedef int cairo_recursive_mutex_impl_t;
+
+# define CAIRO_RECURSIVE_MUTEX_IMPL_INIT(mutex)
+# define CAIRO_RECURSIVE_MUTEX_IMPL_NIL_INITIALIZER 0
+
+#elif defined(_WIN32) /******************************************************/
+
+#define WIN32_LEAN_AND_MEAN
+/* We require Windows 2000 features such as ETO_PDY */
+#if !defined(WINVER) || (WINVER < 0x0500)
+# define WINVER 0x0500
+#endif
+#if !defined(_WIN32_WINNT) || (_WIN32_WINNT < 0x0500)
+# define _WIN32_WINNT 0x0500
+#endif
+
+# 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
+
+#elif CAIRO_HAS_PTHREAD /* and finally if there are no native mutexes ********/
+
+# include <pthread.h>
+
+  typedef pthread_mutex_t cairo_mutex_impl_t;
+  typedef pthread_mutex_t cairo_recursive_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
+
+# define CAIRO_MUTEX_HAS_RECURSIVE_IMPL 1
+# define CAIRO_RECURSIVE_MUTEX_IMPL_INIT(mutex) do { \
+    pthread_mutexattr_t attr; \
+    pthread_mutexattr_init (&attr); \
+    pthread_mutexattr_settype (&attr, PTHREAD_MUTEX_RECURSIVE); \
+    pthread_mutex_init (&(mutex), &attr); \
+    pthread_mutexattr_destroy (&attr); \
+} while (0)
+# define CAIRO_RECURSIVE_MUTEX_IMPL_NIL_INITIALIZER PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP
+
+#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
+
+/* By default mutex implementations are assumed to be recursive */
+#if ! CAIRO_MUTEX_HAS_RECURSIVE_IMPL
+
+# define CAIRO_MUTEX_HAS_RECURSIVE_IMPL 1
+
+  typedef cairo_mutex_impl_t cairo_recursive_mutex_impl_t;
+
+# define CAIRO_RECURSIVE_MUTEX_IMPL_INIT(mutex) CAIRO_MUTEX_IMPL_INIT(mutex)
+# define CAIRO_RECURSIVE_MUTEX_IMPL_NIL_INITIALIZER CAIRO_MUTEX_IMPL_NIL_INITIALIZER
+
+#endif
+
+#endif