/* * 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 <[email protected]> * Red Hat Author(s): Behdad Esfahbod * Google Author(s): Behdad Esfahbod */ #ifndef HB_ATOMIC_HH #define HB_ATOMIC_HH #include "hb.hh" #include "hb-meta.hh" /* * Atomic integers and pointers. */ /* 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. */ #elif !defined(HB_NO_MT) && defined(__ATOMIC_ACQUIRE) /* C++11-style GCC primitives. We prefer these as they don't require linking to libstdc++ / libc++. */ #define _hb_memory_barrier() … #define hb_atomic_int_impl_add(AI, V) … #define hb_atomic_int_impl_set_relaxed(AI, V) … #define hb_atomic_int_impl_set(AI, V) … #define hb_atomic_int_impl_get_relaxed(AI) … #define hb_atomic_int_impl_get(AI) … #define hb_atomic_ptr_impl_set_relaxed(P, V) … #define hb_atomic_ptr_impl_get_relaxed(P) … #define hb_atomic_ptr_impl_get(P) … static inline bool _hb_atomic_ptr_impl_cmplexch (const void **P, const void *O_, const void *N) { … } #define hb_atomic_ptr_impl_cmpexch(P,O,N) … #elif !defined(HB_NO_MT) /* C++11 atomics. */ #include <atomic> #define _hb_memory_barrier … #define _hb_memory_r_barrier … #define _hb_memory_w_barrier … #define hb_atomic_int_impl_add … #define hb_atomic_int_impl_set_relaxed … #define hb_atomic_int_impl_set … #define hb_atomic_int_impl_get_relaxed … #define hb_atomic_int_impl_get … #define hb_atomic_ptr_impl_set_relaxed … #define hb_atomic_ptr_impl_get_relaxed … #define hb_atomic_ptr_impl_get … 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 … #else /* defined(HB_NO_MT) */ #define hb_atomic_int_impl_add … #define _hb_memory_barrier … #define hb_atomic_ptr_impl_cmpexch … #endif /* This should never be disabled, even under HB_NO_MT. * except that MSVC gives me an internal compiler error, so disabled there. * * https://github.com/harfbuzz/harfbuzz/pull/4119 */ #ifndef _hb_compiler_memory_r_barrier #if defined(__ATOMIC_ACQUIRE) // gcc-like static inline void _hb_compiler_memory_r_barrier () { … } #elif !defined(_MSC_VER) #include <atomic> #define _hb_compiler_memory_r_barrier … #else static inline void _hb_compiler_memory_r_barrier () {} #endif #endif #ifndef _hb_memory_r_barrier #define _hb_memory_r_barrier() … #endif #ifndef _hb_memory_w_barrier #define _hb_memory_w_barrier() … #endif #ifndef hb_atomic_int_impl_set_relaxed #define hb_atomic_int_impl_set_relaxed … #endif #ifndef hb_atomic_int_impl_get_relaxed #define hb_atomic_int_impl_get_relaxed … #endif #ifndef hb_atomic_ptr_impl_set_relaxed #define hb_atomic_ptr_impl_set_relaxed … #endif #ifndef hb_atomic_ptr_impl_get_relaxed #define hb_atomic_ptr_impl_get_relaxed … #endif #ifndef hb_atomic_int_impl_set inline void hb_atomic_int_impl_set (int *AI, int v) { _hb_memory_w_barrier (); *AI = v; } inline void hb_atomic_int_impl_set (short *AI, short v) { _hb_memory_w_barrier (); *AI = v; } #endif #ifndef hb_atomic_int_impl_get inline int hb_atomic_int_impl_get (const int *AI) { int v = *AI; _hb_memory_r_barrier (); return v; } inline short hb_atomic_int_impl_get (const short *AI) { short v = *AI; _hb_memory_r_barrier (); return v; } #endif #ifndef hb_atomic_ptr_impl_get inline void *hb_atomic_ptr_impl_get (void ** const P) { void *v = *P; _hb_memory_r_barrier (); return v; } #endif struct hb_atomic_short_t { … }; struct hb_atomic_int_t { … }; template <typename P> struct hb_atomic_ptr_t { … }; static inline bool hb_barrier () { … } #endif /* HB_ATOMIC_HH */
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