| /* |
| * 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" |
| |
| /* MinGW has a convoluted history of supporting MemoryBarrier |
| * properly. As such, define a function to wrap the whole |
| * thing. */ |
| static inline void _FCMemoryBarrier (void) { |
| #if !defined(MemoryBarrier) |
| long dummy = 0; |
| InterlockedExchange (&dummy, 1); |
| #else |
| MemoryBarrier (); |
| #endif |
| } |
| |
| typedef LONG fc_atomic_int_t; |
| #define fc_atomic_int_add(AI, V) InterlockedExchangeAdd (&(AI), (V)) |
| |
| #define fc_atomic_ptr_get(P) (_FCMemoryBarrier (), (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> |
| #ifdef __MAC_OS_X_MIN_REQUIRED |
| #include <AvailabilityMacros.h> |
| #elif defined(__IPHONE_OS_MIN_REQUIRED) |
| #include <Availability.h> |
| #endif |
| |
| 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)) |
| #if (MAC_OS_X_VERSION_MIN_REQUIRED > MAC_OS_X_VERSION_10_4 || __IPHONE_VERSION_MIN_REQUIRED >= 20100) |
| #define fc_atomic_ptr_cmpexch(P,O,N) OSAtomicCompareAndSwapPtrBarrier ((void *) (O), (void *) (N), (void **) (P)) |
| #else |
| #if __ppc64__ || __x86_64__ |
| #define fc_atomic_ptr_cmpexch(P,O,N) OSAtomicCompareAndSwap64Barrier ((int64_t) (O), (int64_t) (N), (int64_t*) (P)) |
| #else |
| #define fc_atomic_ptr_cmpexch(P,O,N) OSAtomicCompareAndSwap32Barrier ((int32_t) (O), (int32_t) (N), (int32_t*) (P)) |
| #endif |
| #endif |
| |
| #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) && defined(HAVE_SOLARIS_ATOMIC_OPS) |
| |
| #include <atomic.h> |
| #include <mbarrier.h> |
| |
| typedef unsigned int fc_atomic_int_t; |
| #define fc_atomic_int_add(AI, V) ( ({__machine_rw_barrier ();}), atomic_add_int_nv (&(AI), (V)) - (V)) |
| |
| #define fc_atomic_ptr_get(P) ( ({__machine_rw_barrier ();}), (void *) *(P)) |
| #define fc_atomic_ptr_cmpexch(P,O,N) ( ({__machine_rw_barrier ();}), atomic_cas_ptr ((P), (O), (N)) == (void *) (O) ? FcTrue : FcFalse) |
| |
| |
| #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_ */ |