kc3-lang/harfbuzz/src/hb-mutex.hh

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• Hash : c77ae408
  Author :
  Date : 2018-08-25T22:36:36
  

  Rename hb-*private.hh to hb-*.hh
  
  Sorry for the noise, downstream custom builders.  Please adjust.
  

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• src/hb-mutex.hh

• /*
   * 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_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(_WIN32) || defined(__CYGWIN__))
  
  #include <windows.h>
  typedef CRITICAL_SECTION hb_mutex_impl_t;
  #define HB_MUTEX_IMPL_INIT	{0}
  #if defined(WINAPI_FAMILY) && (WINAPI_FAMILY==WINAPI_FAMILY_PC_APP || WINAPI_FAMILY==WINAPI_FAMILY_PHONE_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) && (defined(HAVE_PTHREAD) || defined(__APPLE__))
  
  #include <pthread.h>
  typedef pthread_mutex_t hb_mutex_impl_t;
  #define HB_MUTEX_IMPL_INIT	PTHREAD_MUTEX_INITIALIZER
  #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(HAVE_INTEL_ATOMIC_PRIMITIVES)
  
  #if defined(HAVE_SCHED_H) && defined(HAVE_SCHED_YIELD)
  # include <sched.h>
  # define HB_SCHED_YIELD() sched_yield ()
  #else
  # define HB_SCHED_YIELD() HB_STMT_START {} HB_STMT_END
  #endif
  
  /* This actually is not a totally awful implementation. */
  typedef volatile int hb_mutex_impl_t;
  #define HB_MUTEX_IMPL_INIT	0
  #define hb_mutex_impl_init(M)	*(M) = 0
  #define hb_mutex_impl_lock(M)	HB_STMT_START { while (__sync_lock_test_and_set((M), 1)) HB_SCHED_YIELD (); } HB_STMT_END
  #define hb_mutex_impl_unlock(M)	__sync_lock_release (M)
  #define hb_mutex_impl_finish(M)	HB_STMT_START {} HB_STMT_END
  
  
  #elif !defined(HB_NO_MT)
  
  #if defined(HAVE_SCHED_H) && defined(HAVE_SCHED_YIELD)
  # include <sched.h>
  # define HB_SCHED_YIELD() sched_yield ()
  #else
  # define HB_SCHED_YIELD() HB_STMT_START {} HB_STMT_END
  #endif
  
  #define HB_MUTEX_INT_NIL 1 /* Warn that fallback implementation is in use. */
  typedef volatile int hb_mutex_impl_t;
  #define HB_MUTEX_IMPL_INIT	0
  #define hb_mutex_impl_init(M)	*(M) = 0
  #define hb_mutex_impl_lock(M)	HB_STMT_START { while (*(M)) HB_SCHED_YIELD (); (*(M))++; } HB_STMT_END
  #define hb_mutex_impl_unlock(M)	(*(M))--;
  #define hb_mutex_impl_finish(M)	HB_STMT_START {} HB_STMT_END
  
  
  #else /* HB_NO_MT */
  
  typedef int hb_mutex_impl_t;
  #define HB_MUTEX_IMPL_INIT	0
  #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
  
  
  #define HB_MUTEX_INIT		{HB_MUTEX_IMPL_INIT}
  
  struct hb_mutex_t
  {
    /* TODO Add tracing. */
  
    hb_mutex_impl_t m;
  
    inline void init   (void) { hb_mutex_impl_init   (&m); }
    inline void lock   (void) { hb_mutex_impl_lock   (&m); }
    inline void unlock (void) { hb_mutex_impl_unlock (&m); }
    inline void fini (void) { hb_mutex_impl_finish (&m); }
  };
  
  
  #endif /* HB_MUTEX_HH */
  

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