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document way to use a TLS slot on windows

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daanx 2024-12-22 21:55:40 -08:00
parent dd1b37c9f8
commit 04970f43e5
1 changed files with 14 additions and 0 deletions
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14
include/mimalloc/prim.h
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@ -207,6 +207,20 @@ static inline void mi_prim_tls_slot_set(size_t slot, void* value) mi_attr_noexce
#endif
}
#elif 0 && _MSC_VER && _WIN32
// On Windows, using a fixed TLS slot has better codegen than a thread-local
// but it might clash with an application trying to use the same slot. (so we disable this by default)
#include <winternl.h>
#define MI_HAS_TLS_SLOT
#define MI_TLS_SLOT 63 // last available slot
static inline void* mi_prim_tls_slot(size_t slot) mi_attr_noexcept {
return NtCurrentTeb()->TlsSlots[slot];
}
static inline void mi_prim_tls_slot_set(size_t slot, void* value) mi_attr_noexcept {
NtCurrentTeb()->TlsSlots[slot] = value;
}
#endif
// Do we have __builtin_thread_pointer? This would be the preferred way to get a unique thread id