301 lines
10 KiB
C++
301 lines
10 KiB
C++
/*
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* Copyright © 2007 Chris Wilson
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* Copyright © 2009,2010 Red Hat, Inc.
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* Copyright © 2011,2012 Google, Inc.
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*
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* This is part of HarfBuzz, a text shaping library.
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*
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* Permission is hereby granted, without written agreement and without
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* license or royalty fees, to use, copy, modify, and distribute this
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* software and its documentation for any purpose, provided that the
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* above copyright notice and the following two paragraphs appear in
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* all copies of this software.
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*
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* IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
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* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
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* ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
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* IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
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* DAMAGE.
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*
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* THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
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* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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* FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
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* ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
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* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
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*
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* Contributor(s):
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* Chris Wilson <chris@chris-wilson.co.uk>
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* Red Hat Author(s): Behdad Esfahbod
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* Google Author(s): Behdad Esfahbod
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*/
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#ifndef HB_ATOMIC_HH
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#define HB_ATOMIC_HH
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#include "hb.hh"
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/*
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* Atomic integers and pointers.
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*/
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/* We need external help for these */
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#if defined(hb_atomic_int_impl_add) \
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&& defined(hb_atomic_ptr_impl_get) \
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&& defined(hb_atomic_ptr_impl_cmpexch)
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/* Defined externally, i.e. in config.h. */
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#elif !defined(HB_NO_MT) && defined(__ATOMIC_ACQUIRE)
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/* C++11-style GCC primitives. */
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#define _hb_memory_barrier() __sync_synchronize ()
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#define hb_atomic_int_impl_add(AI, V) __atomic_fetch_add ((AI), (V), __ATOMIC_ACQ_REL)
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#define hb_atomic_int_impl_set_relaxed(AI, V) __atomic_store_n ((AI), (V), __ATOMIC_RELAXED)
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#define hb_atomic_int_impl_set(AI, V) __atomic_store_n ((AI), (V), __ATOMIC_RELEASE)
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#define hb_atomic_int_impl_get_relaxed(AI) __atomic_load_n ((AI), __ATOMIC_RELAXED)
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#define hb_atomic_int_impl_get(AI) __atomic_load_n ((AI), __ATOMIC_ACQUIRE)
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#define hb_atomic_ptr_impl_set_relaxed(P, V) __atomic_store_n ((P), (V), __ATOMIC_RELAXED)
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#define hb_atomic_ptr_impl_get_relaxed(P) __atomic_load_n ((P), __ATOMIC_RELAXED)
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#define hb_atomic_ptr_impl_get(P) __atomic_load_n ((P), __ATOMIC_ACQUIRE)
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static inline bool
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_hb_atomic_ptr_impl_cmplexch (const void **P, const void *O_, const void *N)
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{
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const void *O = O_; // Need lvalue
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return __atomic_compare_exchange_n ((void **) P, (void **) &O, (void *) N, true, __ATOMIC_ACQ_REL, __ATOMIC_RELAXED);
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}
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#define hb_atomic_ptr_impl_cmpexch(P,O,N) _hb_atomic_ptr_impl_cmplexch ((const void **) (P), (O), (N))
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#elif !defined(HB_NO_MT) && __cplusplus >= 201103L
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/* C++11 atomics. */
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#include <atomic>
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#define _hb_memory_barrier() std::atomic_thread_fence(std::memory_order_ack_rel)
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#define _hb_memory_r_barrier() std::atomic_thread_fence(std::memory_order_acquire)
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#define _hb_memory_w_barrier() std::atomic_thread_fence(std::memory_order_release)
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#define hb_atomic_int_impl_add(AI, V) (reinterpret_cast<std::atomic<int> *> (AI)->fetch_add ((V), std::memory_order_acq_rel))
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#define hb_atomic_int_impl_set_relaxed(AI, V) (reinterpret_cast<std::atomic<int> *> (AI)->store ((V), std::memory_order_relaxed))
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#define hb_atomic_int_impl_set(AI, V) (reinterpret_cast<std::atomic<int> *> (AI)->store ((V), std::memory_order_release))
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#define hb_atomic_int_impl_get_relaxed(AI) (reinterpret_cast<std::atomic<int> *> (AI)->load (std::memory_order_relaxed))
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#define hb_atomic_int_impl_get(AI) (reinterpret_cast<std::atomic<int> *> (AI)->load (std::memory_order_acquire))
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#define hb_atomic_ptr_impl_set_relaxed(P, V) (reinterpret_cast<std::atomic<void*> *> (P)->store ((V), std::memory_order_relaxed))
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#define hb_atomic_ptr_impl_get_relaxed(P) (reinterpret_cast<std::atomic<void*> *> (P)->load (std::memory_order_relaxed))
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#define hb_atomic_ptr_impl_get(P) (reinterpret_cast<std::atomic<void*> *> (P)->load (std::memory_order_acquire))
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static inline bool
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_hb_atomic_ptr_impl_cmplexch (const void **P, const void *O_, const void *N)
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{
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const void *O = O_; // Need lvalue
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return reinterpret_cast<std::atomic<const void*> *> (P)->compare_exchange_weak (O, N, std::memory_order_acq_rel, std::memory_order_relaxed);
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}
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#define hb_atomic_ptr_impl_cmpexch(P,O,N) _hb_atomic_ptr_impl_cmplexch ((const void **) (P), (O), (N))
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#elif !defined(HB_NO_MT) && defined(_WIN32)
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#include <windows.h>
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static inline void _hb_memory_barrier ()
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{
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#if !defined(MemoryBarrier)
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/* MinGW has a convoluted history of supporting MemoryBarrier. */
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LONG dummy = 0;
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InterlockedExchange (&dummy, 1);
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#else
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MemoryBarrier ();
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#endif
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}
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#define _hb_memory_barrier() _hb_memory_barrier ()
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#define hb_atomic_int_impl_add(AI, V) InterlockedExchangeAdd ((LONG *) (AI), (V))
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static_assert ((sizeof (LONG) == sizeof (int)), "");
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#define hb_atomic_ptr_impl_cmpexch(P,O,N) (InterlockedCompareExchangePointer ((P), (N), (O)) == (O))
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#elif !defined(HB_NO_MT) && defined(HAVE_INTEL_ATOMIC_PRIMITIVES)
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#define _hb_memory_barrier() __sync_synchronize ()
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#define hb_atomic_int_impl_add(AI, V) __sync_fetch_and_add ((AI), (V))
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#define hb_atomic_ptr_impl_cmpexch(P,O,N) __sync_bool_compare_and_swap ((P), (O), (N))
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#elif !defined(HB_NO_MT) && defined(HAVE_SOLARIS_ATOMIC_OPS)
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#include <atomic.h>
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#include <mbarrier.h>
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#define _hb_memory_r_barrier() __machine_r_barrier ()
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#define _hb_memory_w_barrier() __machine_w_barrier ()
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#define _hb_memory_barrier() __machine_rw_barrier ()
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static inline int _hb_fetch_and_add (int *AI, int V)
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{
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_hb_memory_w_barrier ();
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int result = atomic_add_int_nv ((uint_t *) AI, V);
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_hb_memory_r_barrier ();
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return result;
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}
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static inline bool _hb_compare_and_swap_ptr (void **P, void *O, void *N)
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{
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_hb_memory_w_barrier ();
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bool result = atomic_cas_ptr (P, O, N) == O;
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_hb_memory_r_barrier ();
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return result;
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}
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#define hb_atomic_int_impl_add(AI, V) _hb_fetch_and_add ((AI), (V))
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#define hb_atomic_ptr_impl_cmpexch(P,O,N) _hb_compare_and_swap_ptr ((P), (O), (N))
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#elif !defined(HB_NO_MT) && defined(__APPLE__)
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#include <libkern/OSAtomic.h>
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#ifdef __MAC_OS_X_MIN_REQUIRED
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#include <AvailabilityMacros.h>
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#elif defined(__IPHONE_OS_MIN_REQUIRED)
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#include <Availability.h>
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#endif
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#define _hb_memory_barrier() OSMemoryBarrier ()
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#define hb_atomic_int_impl_add(AI, V) (OSAtomicAdd32Barrier ((V), (AI)) - (V))
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#if (MAC_OS_X_VERSION_MIN_REQUIRED > MAC_OS_X_VERSION_10_4 || __IPHONE_VERSION_MIN_REQUIRED >= 20100)
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#define hb_atomic_ptr_impl_cmpexch(P,O,N) OSAtomicCompareAndSwapPtrBarrier ((O), (N), (P))
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#else
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#if __ppc64__ || __x86_64__ || __aarch64__
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#define hb_atomic_ptr_impl_cmpexch(P,O,N) OSAtomicCompareAndSwap64Barrier ((int64_t) (O), (int64_t) (N), (int64_t*) (P))
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#else
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#define hb_atomic_ptr_impl_cmpexch(P,O,N) OSAtomicCompareAndSwap32Barrier ((int32_t) (O), (int32_t) (N), (int32_t*) (P))
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#endif
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#endif
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#elif !defined(HB_NO_MT) && defined(_AIX) && defined(__IBMCPP__)
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#include <builtins.h>
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#define _hb_memory_barrier() __lwsync ()
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static inline int _hb_fetch_and_add (int *AI, int V)
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{
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_hb_memory_barrier ();
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int result = __fetch_and_add (AI, V);
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_hb_memory_barrier ();
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return result;
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}
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static inline bool _hb_compare_and_swaplp (long *P, long O, long N)
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{
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_hb_memory_barrier ();
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bool result = __compare_and_swaplp (P, &O, N);
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_hb_memory_barrier ();
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return result;
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}
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#define hb_atomic_int_impl_add(AI, V) _hb_fetch_and_add ((AI), (V))
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#define hb_atomic_ptr_impl_cmpexch(P,O,N) _hb_compare_and_swaplp ((long *) (P), (long) (O), (long) (N))
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static_assert ((sizeof (long) == sizeof (void *)), "");
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#elif !defined(HB_NO_MT)
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#define HB_ATOMIC_INT_NIL 1 /* Warn that fallback implementation is in use. */
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#define _hb_memory_barrier()
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#define hb_atomic_int_impl_add(AI, V) ((*(AI) += (V)) - (V))
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#define hb_atomic_ptr_impl_cmpexch(P,O,N) (* (void **) (P) == (void *) (O) ? (* (void **) (P) = (void *) (N), true) : false)
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#else /* HB_NO_MT */
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#define hb_atomic_int_impl_add(AI, V) ((*(AI) += (V)) - (V))
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#define _hb_memory_barrier()
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#define hb_atomic_ptr_impl_cmpexch(P,O,N) (* (void **) (P) == (void *) (O) ? (* (void **) (P) = (void *) (N), true) : false)
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#endif
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#ifndef _hb_memory_r_barrier
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#define _hb_memory_r_barrier() _hb_memory_barrier ()
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#endif
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#ifndef _hb_memory_w_barrier
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#define _hb_memory_w_barrier() _hb_memory_barrier ()
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#endif
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#ifndef hb_atomic_int_impl_set_relaxed
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#define hb_atomic_int_impl_set_relaxed(AI, V) (*(AI) = (V))
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#endif
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#ifndef hb_atomic_int_impl_get_relaxed
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#define hb_atomic_int_impl_get_relaxed(AI) (*(AI))
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#endif
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#ifndef hb_atomic_ptr_impl_set_relaxed
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#define hb_atomic_ptr_impl_set_relaxed(P, V) (*(P) = (V))
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#endif
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#ifndef hb_atomic_ptr_impl_get_relaxed
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#define hb_atomic_ptr_impl_get_relaxed(P) (*(P))
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#endif
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#ifndef hb_atomic_int_impl_set
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inline void hb_atomic_int_impl_set (int *AI, int v) { _hb_memory_w_barrier (); *AI = v; }
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#endif
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#ifndef hb_atomic_int_impl_get
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inline int hb_atomic_int_impl_get (const int *AI) { int v = *AI; _hb_memory_r_barrier (); return v; }
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#endif
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#ifndef hb_atomic_ptr_impl_get
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inline void *hb_atomic_ptr_impl_get (void ** const P) { void *v = *P; _hb_memory_r_barrier (); return v; }
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#endif
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#define HB_ATOMIC_INT_INIT(V) {V}
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struct hb_atomic_int_t
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{
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void set_relaxed (int v_) { hb_atomic_int_impl_set_relaxed (&v, v_); }
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void set (int v_) { hb_atomic_int_impl_set (&v, v_); }
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int get_relaxed () const { return hb_atomic_int_impl_get_relaxed (&v); }
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int get () const { return hb_atomic_int_impl_get (&v); }
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int inc () { return hb_atomic_int_impl_add (&v, 1); }
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int dec () { return hb_atomic_int_impl_add (&v, -1); }
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int v;
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};
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#define HB_ATOMIC_PTR_INIT(V) {V}
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template <typename P>
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struct hb_atomic_ptr_t
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{
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typedef typename hb_remove_pointer (P) T;
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void init (T* v_ = nullptr) { set_relaxed (v_); }
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void set_relaxed (T* v_) { hb_atomic_ptr_impl_set_relaxed (&v, v_); }
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T *get_relaxed () const { return (T *) hb_atomic_ptr_impl_get_relaxed (&v); }
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T *get () const { return (T *) hb_atomic_ptr_impl_get ((void **) &v); }
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bool cmpexch (const T *old, T *new_) const { return hb_atomic_ptr_impl_cmpexch ((void **) &v, (void *) old, (void *) new_); }
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T * operator -> () const { return get (); }
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template <typename C> operator C * () const { return get (); }
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T *v;
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};
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#endif /* HB_ATOMIC_HH */
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