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/*
* 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_ATOMIC_PRIVATE_HH
#define HB_ATOMIC_PRIVATE_HH
#include "hb-private.hh"
/* atomic_int */
/* We need external help for these */
#if defined(hb_atomic_int_impl_add) \
&& defined(hb_atomic_ptr_impl_get) \
&& defined(hb_atomic_ptr_impl_cmpexch)
/* Defined externally, i.e. in config.h; must have typedef'ed hb_atomic_int_impl_t as well. */
#elif !defined(HB_NO_MT) && defined(__ATOMIC_CONSUME)
/* C++11-style GCC primitives. */
typedef int hb_atomic_int_impl_t;
#define hb_atomic_int_impl_add(AI, V) __atomic_fetch_add ((AI), (V), __ATOMIC_ACQ_REL)
#define hb_atomic_int_impl_set_relaxed(AI, V) __atomic_store_n ((AI), (V), __ATOMIC_RELAXED)
#define hb_atomic_int_impl_get_relaxed(AI) __atomic_load_n ((AI), __ATOMIC_RELAXED)
#define hb_atomic_ptr_impl_get(P) __atomic_load_n ((P), __ATOMIC_CONSUME)
static inline bool
_hb_atomic_ptr_impl_cmplexch (const void **P, const void *O_, const void *N)
{
const void *O = O_; // Need lvalue
return __atomic_compare_exchange_n ((void **) P, (void **) &O, (void *) N, true, __ATOMIC_ACQ_REL, __ATOMIC_RELAXED);
}
#define hb_atomic_ptr_impl_cmpexch(P,O,N) (_hb_atomic_ptr_impl_cmplexch ((const void **) (P), (O), (N)))
#elif !defined(HB_NO_MT) && __cplusplus >= 201103L
/* C++11 atomics. */
#include <atomic>
typedef int hb_atomic_int_impl_t;
#define hb_atomic_int_impl_add(AI, V) (reinterpret_cast<std::atomic<int> *> (AI)->fetch_add ((V), std::memory_order_acq_rel))
#define hb_atomic_int_impl_set_relaxed(AI, V) (reinterpret_cast<std::atomic<int> *> (AI)->store ((V), std::memory_order_relaxed))
#define hb_atomic_int_impl_get_relaxed(AI) (reinterpret_cast<std::atomic<int> *> (AI)->load (std::memory_order_relaxed))
#define hb_atomic_ptr_impl_get(P) (reinterpret_cast<std::atomic<void*> *> (P)->load (std::memory_order_consume))
static inline bool
_hb_atomic_ptr_impl_cmplexch (const void **P, const void *O_, const void *N)
{
const void *O = O_; // Need lvalue
return reinterpret_cast<std::atomic<const void*> *> (P)->compare_exchange_weak (O, N, std::memory_order_acq_rel, std::memory_order_relaxed);
}
#define hb_atomic_ptr_impl_cmpexch(P,O,N) (_hb_atomic_ptr_impl_cmplexch ((const void **) (P), (O), (N)))
#elif !defined(HB_NO_MT) && (defined(_WIN32) || defined(__CYGWIN__))
#include <windows.h>
static inline void _hb_memory_barrier (void)
{
#if !defined(MemoryBarrier)
/* MinGW has a convoluted history of supporting MemoryBarrier. */
long dummy = 0;
InterlockedExchange (&dummy, 1);
#else
MemoryBarrier ();
#endif
}
typedef LONG hb_atomic_int_impl_t;
#define hb_atomic_int_impl_add(AI, V) InterlockedExchangeAdd ((AI), (V))
#define hb_atomic_ptr_impl_cmpexch(P,O,N) (InterlockedCompareExchangePointer ((void **) (P), (void *) (N), (void *) (O)) == (void *) (O))
#elif !defined(HB_NO_MT) && defined(HAVE_INTEL_ATOMIC_PRIMITIVES)
typedef int hb_atomic_int_impl_t;
#define hb_atomic_int_impl_add(AI, V) __sync_fetch_and_add ((AI), (V))
static inline void _hb_memory_barrier (void) { __sync_synchronize (); }
#define hb_atomic_ptr_impl_cmpexch(P,O,N) __sync_bool_compare_and_swap ((P), (O), (N))
#elif !defined(HB_NO_MT) && defined(HAVE_SOLARIS_ATOMIC_OPS)
#include <atomic.h>
#include <mbarrier.h>
typedef unsigned int hb_atomic_int_impl_t;
#define hb_atomic_int_impl_add(AI, V) ( ({__machine_rw_barrier ();}), atomic_add_int_nv ((AI), (V)) - (V) /* XXX barrier again? */)
static inline void _hb_memory_barrier (void) { __machine_rw_barrier (); }
#define hb_atomic_ptr_impl_cmpexch(P,O,N) ( ({__machine_rw_barrier ();}), atomic_cas_ptr ((void **) (P), (void *) (O), (void *) (N)) == (void *) (O) ? true : false /* XXX barrier again? */)
#elif !defined(HB_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 int32_t hb_atomic_int_impl_t;
#define hb_atomic_int_impl_add(AI, V) (OSAtomicAdd32Barrier ((V), (AI)) - (V))
static inline void _hb_memory_barrier (void) { OSMemoryBarrier (); }
#if (MAC_OS_X_VERSION_MIN_REQUIRED > MAC_OS_X_VERSION_10_4 || __IPHONE_VERSION_MIN_REQUIRED >= 20100)
#define hb_atomic_ptr_impl_cmpexch(P,O,N) OSAtomicCompareAndSwapPtrBarrier ((void *) (O), (void *) (N), (void **) (P))
#else
#if __ppc64__ || __x86_64__ || __aarch64__
#define hb_atomic_ptr_impl_cmpexch(P,O,N) OSAtomicCompareAndSwap64Barrier ((int64_t) (void *) (O), (int64_t) (void *) (N), (int64_t*) (P))
#else
#define hb_atomic_ptr_impl_cmpexch(P,O,N) OSAtomicCompareAndSwap32Barrier ((int32_t) (void *) (O), (int32_t) (void *) (N), (int32_t*) (P))
#endif
#endif
#elif !defined(HB_NO_MT) && defined(_AIX) && defined(__IBMCPP__)
#include <builtins.h>
static inline int _hb_fetch_and_add(volatile int* AI, unsigned int V) {
__lwsync();
int result = __fetch_and_add(AI, V);
__isync();
return result;
}
static inline int _hb_compare_and_swaplp(volatile long* P, long O, long N) {
__sync();
int result = __compare_and_swaplp (P, &O, N);
__sync();
return result;
}
typedef int hb_atomic_int_impl_t;
#define hb_atomic_int_impl_add(AI, V) _hb_fetch_and_add ((AI), (V))
static inline void _hb_memory_barrier (void) { __sync(); }
#define hb_atomic_ptr_impl_cmpexch(P,O,N) _hb_compare_and_swaplp ((long*)(P), (long)(O), (long)(N))
#elif !defined(HB_NO_MT)
#define HB_ATOMIC_INT_NIL 1 /* Warn that fallback implementation is in use. */
typedef volatile int hb_atomic_int_impl_t;
#define hb_atomic_int_impl_add(AI, V) ((*(AI) += (V)) - (V))
static inline void _hb_memory_barrier (void) {}
#define hb_atomic_ptr_impl_cmpexch(P,O,N) (* (void * volatile *) (P) == (void *) (O) ? (* (void * volatile *) (P) = (void *) (N), true) : false)
#else /* HB_NO_MT */
typedef int hb_atomic_int_impl_t;
#define hb_atomic_int_impl_add(AI, V) ((*(AI) += (V)) - (V))
static inline void _hb_memory_barrier (void) {}
#define hb_atomic_ptr_impl_cmpexch(P,O,N) (* (void **) (P) == (void *) (O) ? (* (void **) (P) = (void *) (N), true) : false)
#endif
#ifndef HB_ATOMIC_INT_INIT
#define HB_ATOMIC_INT_INIT(V) {V}
#endif
#ifndef hb_atomic_int_impl_set_relaxed
#define hb_atomic_int_impl_set_relaxed(AI, V) (*(AI) = (V))
#endif
#ifndef hb_atomic_int_impl_get_relaxed
#define hb_atomic_int_impl_get_relaxed(AI) (*(AI))
#endif
#ifndef hb_atomic_ptr_impl_get
inline void *hb_atomic_ptr_impl_get (void **P) { void *v = *P; _hb_memory_barrier (); return v; }
#endif
struct hb_atomic_int_t
{
mutable hb_atomic_int_impl_t v;
inline void set_relaxed (int v_) { hb_atomic_int_impl_set_relaxed (&v, v_); }
inline int get_relaxed (void) const { return hb_atomic_int_impl_get_relaxed (&v); }
inline int inc (void) { return hb_atomic_int_impl_add (&v, 1); }
inline int dec (void) { return hb_atomic_int_impl_add (&v, -1); }
};
#define hb_atomic_ptr_get(P) hb_atomic_ptr_impl_get(P)
#define hb_atomic_ptr_cmpexch(P,O,N) hb_atomic_ptr_impl_cmpexch((P),(O),(N))
#endif /* HB_ATOMIC_PRIVATE_HH */
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