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/*
* Mutex operations. Originally copied from HarfBuzz.
*
* Copyright © 2007 Chris Wilson
* Copyright © 2009,2010 Red Hat, Inc.
* Copyright © 2011,2012,2013 Google, Inc.
*
* 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 _FCATOMIC_H_
#define _FCATOMIC_H_
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
/* atomic_int */
/* We need external help for these */
#if 0
#elif !defined(FC_NO_MT) && defined(_MSC_VER) || defined(__MINGW32__)
#include "fcwindows.h"
/* mingw32 does not have MemoryBarrier.
* MemoryBarrier may be defined as a macro or a function.
* Just make a failsafe version for ourselves. */
#ifdef MemoryBarrier
#define HBMemoryBarrier MemoryBarrier
#else
static inline void HBMemoryBarrier (void) {
long dummy = 0;
InterlockedExchange (&dummy, 1);
}
#endif
typedef LONG fc_atomic_int_t;
#define fc_atomic_int_add(AI, V) InterlockedExchangeAdd (&(AI), (V))
#define fc_atomic_ptr_get(P) (HBMemoryBarrier (), (void *) *(P))
#define fc_atomic_ptr_cmpexch(P,O,N) (InterlockedCompareExchangePointer ((void **) (P), (void *) (N), (void *) (O)) == (void *) (O))
#elif !defined(FC_NO_MT) && defined(__APPLE__)
#include <libkern/OSAtomic.h>
typedef int fc_atomic_int_t;
#define fc_atomic_int_add(AI, V) (OSAtomicAdd32Barrier ((V), &(AI)) - (V))
#define fc_atomic_ptr_get(P) (OSMemoryBarrier (), (void *) *(P))
#define fc_atomic_ptr_cmpexch(P,O,N) OSAtomicCompareAndSwapPtrBarrier ((void *) (O), (void *) (N), (void **) (P))
#elif !defined(FC_NO_MT) && defined(HAVE_INTEL_ATOMIC_PRIMITIVES)
typedef int fc_atomic_int_t;
#define fc_atomic_int_add(AI, V) __sync_fetch_and_add (&(AI), (V))
#define fc_atomic_ptr_get(P) (void *) (__sync_synchronize (), *(P))
#define fc_atomic_ptr_cmpexch(P,O,N) __sync_bool_compare_and_swap ((P), (O), (N))
#elif !defined(FC_NO_MT)
#define FC_ATOMIC_INT_NIL 1 /* Warn that fallback implementation is in use. */
typedef volatile int fc_atomic_int_t;
#define fc_atomic_int_add(AI, V) (((AI) += (V)) - (V))
#define fc_atomic_ptr_get(P) ((void *) *(P))
#define fc_atomic_ptr_cmpexch(P,O,N) (* (void * volatile *) (P) == (void *) (O) ? (* (void * volatile *) (P) = (void *) (N), FcTrue) : FcFalse)
#else /* FC_NO_MT */
typedef int fc_atomic_int_t;
#define fc_atomic_int_add(AI, V) (((AI) += (V)) - (V))
#define fc_atomic_ptr_get(P) ((void *) *(P))
#define fc_atomic_ptr_cmpexch(P,O,N) (* (void **) (P) == (void *) (O) ? (* (void **) (P) = (void *) (N), FcTrue) : FcFalse)
#endif
/* reference count */
#define FC_REF_CONSTANT_VALUE ((fc_atomic_int_t) -1)
#define FC_REF_CONSTANT {FC_REF_CONSTANT_VALUE}
typedef struct _FcRef { fc_atomic_int_t count; } FcRef;
static inline void FcRefInit (FcRef *r, int v) { r->count = v; }
static inline int FcRefInc (FcRef *r) { return fc_atomic_int_add (r->count, +1); }
static inline int FcRefDec (FcRef *r) { return fc_atomic_int_add (r->count, -1); }
static inline int FcRefAdd (FcRef *r, int v) { return fc_atomic_int_add (r->count, v); }
static inline void FcRefSetConst (FcRef *r) { r->count = FC_REF_CONSTANT_VALUE; }
static inline FcBool FcRefIsConst (const FcRef *r) { return r->count == FC_REF_CONSTANT_VALUE; }
#endif /* _FCATOMIC_H_ */
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