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+/*
+ * Copyright © 2007 Chris Wilson
+ * Copyright © 2009,2010 Red Hat, Inc.
+ * Copyright © 2011,2012 Google, Inc.
+ *
+ * This is part of HarfBuzz, a text shaping library.
+ *
+ * Permission is hereby granted, without written agreement and without
+ * license or royalty fees, to use, copy, modify, and distribute this
+ * software and its documentation for any purpose, provided that the
+ * above copyright notice and the following two paragraphs appear in
+ * all copies of this software.
+ *
+ * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
+ * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
+ * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
+ * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
+ * DAMAGE.
+ *
+ * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
+ * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
+ * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
+ * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
+ * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
+ *
+ * Contributor(s):
+ * Chris Wilson <chris@chris-wilson.co.uk>
+ * Red Hat Author(s): Behdad Esfahbod
+ * Google Author(s): Behdad Esfahbod
+ */
+
+#ifndef HB_MUTEX_HH
+#define HB_MUTEX_HH
+
+#include "hb.hh"
+
+
+/* mutex */
+
+/* We need external help for these */
+
+#if defined(hb_mutex_impl_init) \
+ && defined(hb_mutex_impl_lock) \
+ && defined(hb_mutex_impl_unlock) \
+ && defined(hb_mutex_impl_finish)
+
+/* Defined externally, i.e. in config.h; must have typedef'ed hb_mutex_impl_t as well. */
+
+
+#elif !defined(HB_NO_MT) && !defined(HB_MUTEX_IMPL_STD_MUTEX) && (defined(HAVE_PTHREAD) || defined(__APPLE__))
+
+#include <pthread.h>
+typedef pthread_mutex_t hb_mutex_impl_t;
+#define hb_mutex_impl_init(M) pthread_mutex_init (M, nullptr)
+#define hb_mutex_impl_lock(M) pthread_mutex_lock (M)
+#define hb_mutex_impl_unlock(M) pthread_mutex_unlock (M)
+#define hb_mutex_impl_finish(M) pthread_mutex_destroy (M)
+
+
+#elif !defined(HB_NO_MT) && !defined(HB_MUTEX_IMPL_STD_MUTEX) && defined(_WIN32)
+
+typedef CRITICAL_SECTION hb_mutex_impl_t;
+#if !WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_DESKTOP) && WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_APP)
+#define hb_mutex_impl_init(M) InitializeCriticalSectionEx (M, 0, 0)
+#else
+#define hb_mutex_impl_init(M) InitializeCriticalSection (M)
+#endif
+#define hb_mutex_impl_lock(M) EnterCriticalSection (M)
+#define hb_mutex_impl_unlock(M) LeaveCriticalSection (M)
+#define hb_mutex_impl_finish(M) DeleteCriticalSection (M)
+
+
+#elif !defined(HB_NO_MT)
+
+#include <mutex>
+typedef std::mutex hb_mutex_impl_t;
+#define hb_mutex_impl_init(M) HB_STMT_START { new (M) hb_mutex_impl_t; } HB_STMT_END
+#define hb_mutex_impl_lock(M) (M)->lock ()
+#define hb_mutex_impl_unlock(M) (M)->unlock ()
+#define hb_mutex_impl_finish(M) HB_STMT_START { (M)->~hb_mutex_impl_t(); } HB_STMT_END
+
+
+#else /* defined(HB_NO_MT) */
+
+typedef int hb_mutex_impl_t;
+#define hb_mutex_impl_init(M) HB_STMT_START {} HB_STMT_END
+#define hb_mutex_impl_lock(M) HB_STMT_START {} HB_STMT_END
+#define hb_mutex_impl_unlock(M) HB_STMT_START {} HB_STMT_END
+#define hb_mutex_impl_finish(M) HB_STMT_START {} HB_STMT_END
+
+
+#endif
+
+
+struct hb_mutex_t
+{
+ /* Create space for, but do not initialize m. */
+ alignas(hb_mutex_impl_t) char m[sizeof (hb_mutex_impl_t)];
+
+ hb_mutex_t () { init (); }
+ ~hb_mutex_t () { fini (); }
+
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wcast-align"
+ void init () { hb_mutex_impl_init ((hb_mutex_impl_t *) m); }
+ void lock () { hb_mutex_impl_lock ((hb_mutex_impl_t *) m); }
+ void unlock () { hb_mutex_impl_unlock ((hb_mutex_impl_t *) m); }
+ void fini () { hb_mutex_impl_finish ((hb_mutex_impl_t *) m); }
+#pragma GCC diagnostic pop
+};
+
+struct hb_lock_t
+{
+ hb_lock_t (hb_mutex_t &mutex_) : mutex (&mutex_) { mutex->lock (); }
+ hb_lock_t (hb_mutex_t *mutex_) : mutex (mutex_) { if (mutex) mutex->lock (); }
+ ~hb_lock_t () { if (mutex) mutex->unlock (); }
+ private:
+ hb_mutex_t *mutex;
+};
+
+
+#endif /* HB_MUTEX_HH */