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Read the GC's thread context from a __thread pointer on Linux #429

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Read the GC's thread context from a __thread pointer on Linux #429

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16 changes: 16 additions & 0 deletions include/hx/Tls.h
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Original file line number Diff line number Diff line change
Expand Up @@ -144,6 +144,22 @@ struct TLSData
#define EXTERN_FAST_TLS_DATA(TYPE,NAME) \
__declspec(thread) extern TYPE * NAME;

#elif defined(HX_LINUX) && defined(__GNUC__) && !defined(HXCPP_PTHREAD_FAST_TLS)

// The fast slot (the GC's stack context, read on each allocation that leaves
// the inline path) is a plain thread-local pointer: one load from the thread
// pointer instead of a call to pthread_getspecific. __thread rather than
// thread_local, so the extern declaration reads it directly instead of
// calling the wrapper C++ emits in case of a dynamic initializer.
#define DECLARE_TLS_DATA(TYPE,NAME) \
::hx::TLSData<TYPE> NAME;
#define DECLARE_FAST_TLS_DATA(TYPE,NAME) \
__thread TYPE * NAME = nullptr;
#define EXTERN_TLS_DATA(TYPE,NAME) \
extern ::hx::TLSData<TYPE> NAME;
#define EXTERN_FAST_TLS_DATA(TYPE,NAME) \
extern __thread TYPE * NAME;

#else

#define DECLARE_TLS_DATA(TYPE,NAME) \
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