michael@0: /*
michael@0:  * Copyright © 2007  Chris Wilson
michael@0:  * Copyright © 2009,2010  Red Hat, Inc.
michael@0:  * Copyright © 2011,2012  Google, Inc.
michael@0:  *
michael@0:  *  This is part of HarfBuzz, a text shaping library.
michael@0:  *
michael@0:  * Permission is hereby granted, without written agreement and without
michael@0:  * license or royalty fees, to use, copy, modify, and distribute this
michael@0:  * software and its documentation for any purpose, provided that the
michael@0:  * above copyright notice and the following two paragraphs appear in
michael@0:  * all copies of this software.
michael@0:  *
michael@0:  * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
michael@0:  * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
michael@0:  * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
michael@0:  * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
michael@0:  * DAMAGE.
michael@0:  *
michael@0:  * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
michael@0:  * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
michael@0:  * FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
michael@0:  * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
michael@0:  * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
michael@0:  *
michael@0:  * Contributor(s):
michael@0:  *	Chris Wilson <chris@chris-wilson.co.uk>
michael@0:  * Red Hat Author(s): Behdad Esfahbod
michael@0:  * Google Author(s): Behdad Esfahbod
michael@0:  */
michael@0: 
michael@0: #ifndef HB_ATOMIC_PRIVATE_HH
michael@0: #define HB_ATOMIC_PRIVATE_HH
michael@0: 
michael@0: #include "hb-private.hh"
michael@0: 
michael@0: 
michael@0: /* atomic_int */
michael@0: 
michael@0: /* We need external help for these */
michael@0: 
michael@0: #if 0
michael@0: 
michael@0: 
michael@0: #elif !defined(HB_NO_MT) && (defined(_WIN32) || defined(__CYGWIN__))
michael@0: 
michael@0: #define WIN32_LEAN_AND_MEAN
michael@0: #include <windows.h>
michael@0: 
michael@0: #if defined(__MINGW32__) && !defined(MemoryBarrier)
michael@0: static inline void _HBMemoryBarrier (void) {
michael@0:   long dummy = 0;
michael@0:   InterlockedExchange (&dummy, 1);
michael@0: }
michael@0: # define MemoryBarrier _HBMemoryBarrier
michael@0: #endif
michael@0: 
michael@0: typedef LONG hb_atomic_int_t;
michael@0: #define hb_atomic_int_add(AI, V)	InterlockedExchangeAdd (&(AI), (V))
michael@0: 
michael@0: #define hb_atomic_ptr_get(P)		(MemoryBarrier (), (void *) *(P))
michael@0: #define hb_atomic_ptr_cmpexch(P,O,N)	(InterlockedCompareExchangePointer ((void **) (P), (void *) (N), (void *) (O)) == (void *) (O))
michael@0: 
michael@0: 
michael@0: #elif !defined(HB_NO_MT) && defined(__APPLE__)
michael@0: 
michael@0: #include <libkern/OSAtomic.h>
michael@0: #ifdef __MAC_OS_X_MIN_REQUIRED
michael@0: #include <AvailabilityMacros.h>
michael@0: #elif defined(__IPHONE_OS_MIN_REQUIRED)
michael@0: #include <Availability.h>
michael@0: #endif
michael@0: 
michael@0: typedef int32_t hb_atomic_int_t;
michael@0: #define hb_atomic_int_add(AI, V)	(OSAtomicAdd32Barrier ((V), &(AI)) - (V))
michael@0: 
michael@0: #define hb_atomic_ptr_get(P)		(OSMemoryBarrier (), (void *) *(P))
michael@0: #if (MAC_OS_X_VERSION_MIN_REQUIRED > MAC_OS_X_VERSION_10_4 || __IPHONE_VERSION_MIN_REQUIRED >= 20100)
michael@0: #define hb_atomic_ptr_cmpexch(P,O,N)	OSAtomicCompareAndSwapPtrBarrier ((void *) (O), (void *) (N), (void **) (P))
michael@0: #else
michael@0: #if __ppc64__ || __x86_64__ || __arm64__
michael@0: #define hb_atomic_ptr_cmpexch(P,O,N)    OSAtomicCompareAndSwap64Barrier ((int64_t) (O), (int64_t) (N), (int64_t*) (P))
michael@0: #else
michael@0: #define hb_atomic_ptr_cmpexch(P,O,N)    OSAtomicCompareAndSwap32Barrier ((int32_t) (O), (int32_t) (N), (int32_t*) (P))
michael@0: #endif
michael@0: #endif
michael@0: 
michael@0: 
michael@0: #elif !defined(HB_NO_MT) && defined(HAVE_INTEL_ATOMIC_PRIMITIVES)
michael@0: 
michael@0: typedef int hb_atomic_int_t;
michael@0: #define hb_atomic_int_add(AI, V)	__sync_fetch_and_add (&(AI), (V))
michael@0: 
michael@0: #define hb_atomic_ptr_get(P)		(void *) (__sync_synchronize (), *(P))
michael@0: #define hb_atomic_ptr_cmpexch(P,O,N)	__sync_bool_compare_and_swap ((P), (O), (N))
michael@0: 
michael@0: 
michael@0: #elif !defined(HB_NO_MT) && defined(HAVE_SOLARIS_ATOMIC_OPS)
michael@0: 
michael@0: #include <atomic.h>
michael@0: #include <mbarrier.h>
michael@0: 
michael@0: typedef unsigned int hb_atomic_int_t;
michael@0: #define hb_atomic_int_add(AI, V)	( ({__machine_rw_barrier ();}), atomic_add_int_nv (&(AI), (V)) - (V))
michael@0: 
michael@0: #define hb_atomic_ptr_get(P)		( ({__machine_rw_barrier ();}), (void *) *(P))
michael@0: #define hb_atomic_ptr_cmpexch(P,O,N)	( ({__machine_rw_barrier ();}), atomic_cas_ptr ((void **) (P), (void *) (O), (void *) (N)) == (void *) (O) ? true : false)
michael@0: 
michael@0: 
michael@0: #elif !defined(HB_NO_MT)
michael@0: 
michael@0: #define HB_ATOMIC_INT_NIL 1 /* Warn that fallback implementation is in use. */
michael@0: typedef volatile int hb_atomic_int_t;
michael@0: #define hb_atomic_int_add(AI, V)	(((AI) += (V)) - (V))
michael@0: 
michael@0: #define hb_atomic_ptr_get(P)		((void *) *(P))
michael@0: #define hb_atomic_ptr_cmpexch(P,O,N)	(* (void * volatile *) (P) == (void *) (O) ? (* (void * volatile *) (P) = (void *) (N), true) : false)
michael@0: 
michael@0: 
michael@0: #else /* HB_NO_MT */
michael@0: 
michael@0: typedef int hb_atomic_int_t;
michael@0: #define hb_atomic_int_add(AI, V)	(((AI) += (V)) - (V))
michael@0: 
michael@0: #define hb_atomic_ptr_get(P)		((void *) *(P))
michael@0: #define hb_atomic_ptr_cmpexch(P,O,N)	(* (void **) (P) == (void *) (O) ? (* (void **) (P) = (void *) (N), true) : false)
michael@0: 
michael@0: #endif
michael@0: 
michael@0: /* TODO Add tracing. */
michael@0: 
michael@0: #endif /* HB_ATOMIC_PRIVATE_HH */