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Implement C++11 <atomic> operations 

Fixes https://github.com/harfbuzz/harfbuzz/issues/345
This commit is contained in:
Behdad Esfahbod 2018-07-16 15:41:09 +02:00
parent 5244112240
commit bda242409f
3 changed files with 26 additions and 5 deletions
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27
src/hb-atomic-private.hh
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@ -46,6 +46,25 @@
/* Defined externally, i.e. in config.h; must have typedef'ed hb_atomic_int_impl_t as well. */
#elif !defined(HB_NO_MT) && __cplusplus >= 201103L
/* Prefer 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))
#define hb_atomic_ptr_impl_get(P) (reinterpret_cast<std::atomic<void*> *> (P)->load ())
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));
}
#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>
@ -162,16 +181,18 @@ typedef int hb_atomic_int_impl_t;
#endif
#ifndef HB_ATOMIC_INT_INIT
#define HB_ATOMIC_INT_INIT(V) {V}
#endif
struct hb_atomic_int_t
{
hb_atomic_int_impl_t v;
mutable hb_atomic_int_impl_t v;
inline void set_unsafe (int v_) { v = v_; }
inline int get_unsafe (void) const { return v; }
inline int inc (void) { return hb_atomic_int_impl_add (const_cast<hb_atomic_int_impl_t &> (v), 1); }
inline int dec (void) { return hb_atomic_int_impl_add (const_cast<hb_atomic_int_impl_t &> (v), -1); }
inline int inc (void) { return hb_atomic_int_impl_add (v, 1); }
inline int dec (void) { return hb_atomic_int_impl_add (v, -1); }
};

2
src/hb-open-type-private.hh
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@ -1247,7 +1247,7 @@ struct hb_lazy_loader_t
private:
hb_face_t *face;
T *instance;
mutable T *instance;
};
/* Logic is shared between hb_lazy_loader_t and hb_table_lazy_loader_t */

2
src/hb-ot-shape-complex-arabic.cc
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@ -250,7 +250,7 @@ struct arabic_shape_plan_t
* mask_array[NONE] == 0. */
hb_mask_t mask_array[ARABIC_NUM_FEATURES + 1];
arabic_fallback_plan_t *fallback_plan;
mutable arabic_fallback_plan_t *fallback_plan;
unsigned int do_fallback : 1;
unsigned int has_stch : 1;