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Diffstat (limited to 'fontconfig/src/fcatomic.h')
| -rw-r--r-- | fontconfig/src/fcatomic.h | 121 |
1 files changed, 121 insertions, 0 deletions
diff --git a/fontconfig/src/fcatomic.h b/fontconfig/src/fcatomic.h new file mode 100644 index 000000000..72ae37280 --- /dev/null +++ b/fontconfig/src/fcatomic.h @@ -0,0 +1,121 @@ +/* + * 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_ */ |