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improve TLS access on Windows with msvc (by Frank Richter, issue #1078)

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daanx 2025-05-04 09:04:57 -07:00
parent 417e8176bd
commit e4c5d09d65
2 changed files with 6 additions and 3 deletions
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4
ide/vs2022/mimalloc-test-stress.vcxproj
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@ -282,8 +282,8 @@
</ClCompile>
</ItemGroup>
<ItemGroup>
<ProjectReference Include="mimalloc-lib.vcxproj">
<Project>{abb5eae7-b3e6-432e-b636-333449892ea6}</Project>
<ProjectReference Include="mimalloc-override-dll.vcxproj">
<Project>{abb5eae7-b3e6-432e-b636-333449892ea7}</Project>
</ProjectReference>
</ItemGroup>
<Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />

5
include/mimalloc/prim.h
View file

@ -208,7 +208,7 @@ static inline void mi_prim_tls_slot_set(size_t slot, void* value) mi_attr_noexce
#elif _WIN32 && MI_WIN_USE_FIXED_TLS && !defined(MI_WIN_USE_FLS)
// On windows we can store the thread-local heap at a fixed TLS slot to avoid
// thread-local initialization checks in the fast path.
// 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).
@ -270,6 +270,9 @@ static inline void mi_prim_tls_slot_set(size_t slot, void* value) mi_attr_noexce
// defined in `init.c`; do not use these directly
#ifdef _MSC_VER
__declspec(selectany) // make it part of the comdat section to have faster TLS access (issue #1078)
#endif
extern mi_decl_thread mi_heap_t* _mi_heap_default; // default heap to allocate from
extern bool _mi_process_is_initialized; // has mi_process_init been called?