1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/gfx/harfbuzz/src/hb-mutex-private.hh Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,130 @@
1.4 +/*
1.5 + * Copyright © 2007 Chris Wilson
1.6 + * Copyright © 2009,2010 Red Hat, Inc.
1.7 + * Copyright © 2011,2012 Google, Inc.
1.8 + *
1.9 + * This is part of HarfBuzz, a text shaping library.
1.10 + *
1.11 + * Permission is hereby granted, without written agreement and without
1.12 + * license or royalty fees, to use, copy, modify, and distribute this
1.13 + * software and its documentation for any purpose, provided that the
1.14 + * above copyright notice and the following two paragraphs appear in
1.15 + * all copies of this software.
1.16 + *
1.17 + * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
1.18 + * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
1.19 + * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
1.20 + * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
1.21 + * DAMAGE.
1.22 + *
1.23 + * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
1.24 + * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
1.25 + * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
1.26 + * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
1.27 + * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
1.28 + *
1.29 + * Contributor(s):
1.30 + * Chris Wilson <chris@chris-wilson.co.uk>
1.31 + * Red Hat Author(s): Behdad Esfahbod
1.32 + * Google Author(s): Behdad Esfahbod
1.33 + */
1.34 +
1.35 +#ifndef HB_MUTEX_PRIVATE_HH
1.36 +#define HB_MUTEX_PRIVATE_HH
1.37 +
1.38 +#include "hb-private.hh"
1.39 +
1.40 +
1.41 +/* mutex */
1.42 +
1.43 +/* We need external help for these */
1.44 +
1.45 +#if 0
1.46 +
1.47 +
1.48 +#elif !defined(HB_NO_MT) && (defined(_WIN32) || defined(__CYGWIN__))
1.49 +
1.50 +#define WIN32_LEAN_AND_MEAN
1.51 +#include <windows.h>
1.52 +typedef CRITICAL_SECTION hb_mutex_impl_t;
1.53 +#define HB_MUTEX_IMPL_INIT { NULL, 0, 0, NULL, NULL, 0 }
1.54 +#define hb_mutex_impl_init(M) InitializeCriticalSection (M)
1.55 +#define hb_mutex_impl_lock(M) EnterCriticalSection (M)
1.56 +#define hb_mutex_impl_unlock(M) LeaveCriticalSection (M)
1.57 +#define hb_mutex_impl_finish(M) DeleteCriticalSection (M)
1.58 +
1.59 +
1.60 +#elif !defined(HB_NO_MT) && (defined(HAVE_PTHREAD) || defined(__APPLE__))
1.61 +
1.62 +#include <pthread.h>
1.63 +typedef pthread_mutex_t hb_mutex_impl_t;
1.64 +#define HB_MUTEX_IMPL_INIT PTHREAD_MUTEX_INITIALIZER
1.65 +#define hb_mutex_impl_init(M) pthread_mutex_init (M, NULL)
1.66 +#define hb_mutex_impl_lock(M) pthread_mutex_lock (M)
1.67 +#define hb_mutex_impl_unlock(M) pthread_mutex_unlock (M)
1.68 +#define hb_mutex_impl_finish(M) pthread_mutex_destroy (M)
1.69 +
1.70 +
1.71 +#elif !defined(HB_NO_MT) && defined(HAVE_INTEL_ATOMIC_PRIMITIVES)
1.72 +
1.73 +#if defined(HAVE_SCHED_H) && defined(HAVE_SCHED_YIELD)
1.74 +# include <sched.h>
1.75 +# define HB_SCHED_YIELD() sched_yield ()
1.76 +#else
1.77 +# define HB_SCHED_YIELD() HB_STMT_START {} HB_STMT_END
1.78 +#endif
1.79 +
1.80 +/* This actually is not a totally awful implementation. */
1.81 +typedef volatile int hb_mutex_impl_t;
1.82 +#define HB_MUTEX_IMPL_INIT 0
1.83 +#define hb_mutex_impl_init(M) *(M) = 0
1.84 +#define hb_mutex_impl_lock(M) HB_STMT_START { while (__sync_lock_test_and_set((M), 1)) HB_SCHED_YIELD (); } HB_STMT_END
1.85 +#define hb_mutex_impl_unlock(M) __sync_lock_release (M)
1.86 +#define hb_mutex_impl_finish(M) HB_STMT_START {} HB_STMT_END
1.87 +
1.88 +
1.89 +#elif !defined(HB_NO_MT)
1.90 +
1.91 +#if defined(HAVE_SCHED_H) && defined(HAVE_SCHED_YIELD)
1.92 +# include <sched.h>
1.93 +# define HB_SCHED_YIELD() sched_yield ()
1.94 +#else
1.95 +# define HB_SCHED_YIELD() HB_STMT_START {} HB_STMT_END
1.96 +#endif
1.97 +
1.98 +#define HB_MUTEX_INT_NIL 1 /* Warn that fallback implementation is in use. */
1.99 +typedef volatile int hb_mutex_impl_t;
1.100 +#define HB_MUTEX_IMPL_INIT 0
1.101 +#define hb_mutex_impl_init(M) *(M) = 0
1.102 +#define hb_mutex_impl_lock(M) HB_STMT_START { while (*(M)) HB_SCHED_YIELD (); (*(M))++; } HB_STMT_END
1.103 +#define hb_mutex_impl_unlock(M) (*(M))--;
1.104 +#define hb_mutex_impl_finish(M) HB_STMT_START {} HB_STMT_END
1.105 +
1.106 +
1.107 +#else /* HB_NO_MT */
1.108 +
1.109 +typedef int hb_mutex_impl_t;
1.110 +#define HB_MUTEX_IMPL_INIT 0
1.111 +#define hb_mutex_impl_init(M) HB_STMT_START {} HB_STMT_END
1.112 +#define hb_mutex_impl_lock(M) HB_STMT_START {} HB_STMT_END
1.113 +#define hb_mutex_impl_unlock(M) HB_STMT_START {} HB_STMT_END
1.114 +#define hb_mutex_impl_finish(M) HB_STMT_START {} HB_STMT_END
1.115 +
1.116 +#endif
1.117 +
1.118 +
1.119 +#define HB_MUTEX_INIT {HB_MUTEX_IMPL_INIT}
1.120 +struct hb_mutex_t
1.121 +{
1.122 + /* TODO Add tracing. */
1.123 +
1.124 + hb_mutex_impl_t m;
1.125 +
1.126 + inline void init (void) { hb_mutex_impl_init (&m); }
1.127 + inline void lock (void) { hb_mutex_impl_lock (&m); }
1.128 + inline void unlock (void) { hb_mutex_impl_unlock (&m); }
1.129 + inline void finish (void) { hb_mutex_impl_finish (&m); }
1.130 +};
1.131 +
1.132 +
1.133 +#endif /* HB_MUTEX_PRIVATE_HH */
