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use TlsAlloc with a dynamic offset for MI_WIN_USE_FIXED_TLS by default (issue #1078)

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daanx 2025-05-04 22:03:10 -07:00
parent 08d91e2101
commit 52b75693c4
3 changed files with 18 additions and 14 deletions
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13
include/mimalloc/prim.h
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@ -209,19 +209,18 @@ static inline void mi_prim_tls_slot_set(size_t slot, void* value) mi_attr_noexce
// On windows we can store the thread-local heap at a fixed TLS slot to avoid
// thread-local initialization checks in the fast path.
// We always use the second user TLS slot (the first one is always allocated already),
// and at initialization (`windows/prim.c`) we call TlsAlloc and verify
// we indeed get the second slot (and fail otherwise).
// Todo: we could make the Tls slot completely dynamic but that would require
// an extra read of the static Tls slot instead of using a constant offset.
// We allocate a user TLS slot at process initialization (see `windows/prim.c`)
// and store the offset `_mi_win_tls_offset`.
#define MI_HAS_TLS_SLOT 2 // 2 = we can reliably initialize the slot (saving a test on each malloc)
extern mi_decl_hidden size_t _mi_win_tls_offset;
#if MI_WIN_USE_FIXED_TLS > 1
#define MI_TLS_SLOT (MI_WIN_USE_FIXED_TLS)
#elif MI_SIZE_SIZE == 4
#define MI_TLS_SLOT (0x0E18) // Second User TLS slot <https://en.wikipedia.org/wiki/Win32_Thread_Information_Block>
#define MI_TLS_SLOT (0x0E10 + _mi_win_tls_offset) // User TLS slots <https://en.wikipedia.org/wiki/Win32_Thread_Information_Block>
#else
#define MI_TLS_SLOT (0x1488) // Second User TLS slot <https://en.wikipedia.org/wiki/Win32_Thread_Information_Block>
#define MI_TLS_SLOT (0x1480 + _mi_win_tls_offset) // User TLS slots <https://en.wikipedia.org/wiki/Win32_Thread_Information_Block>
#endif
static inline void* mi_prim_tls_slot(size_t slot) mi_attr_noexcept {