150 lines
4.6 KiB
C++
150 lines
4.6 KiB
C++
/*
|
|
* 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)
|
|
|
|
#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;
|
|
|
|
void init () { hb_mutex_impl_init (&m); }
|
|
void lock () { hb_mutex_impl_lock (&m); }
|
|
void unlock () { hb_mutex_impl_unlock (&m); }
|
|
void fini () { hb_mutex_impl_finish (&m); }
|
|
};
|
|
|
|
struct hb_lock_t
|
|
{
|
|
hb_lock_t (hb_mutex_t &mutex_) : mutex (mutex_) { mutex.lock (); }
|
|
~hb_lock_t () { mutex.unlock (); }
|
|
private:
|
|
hb_mutex_t &mutex;
|
|
};
|
|
|
|
|
|
#endif /* HB_MUTEX_HH */
|