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fix getting the unique thread id on the Apple M1, see issue #354.

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This commit is contained in:
Daan Leijen 2021-02-01 15:47:22 -08:00
parent c426ab4ea2
commit a7c33a3b0e
1 changed files with 8 additions and 3 deletions
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11
include/mimalloc-internal.h
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@ -707,7 +707,7 @@ static inline void* mi_tls_slot(size_t slot) mi_attr_noexcept {
res = tcb[slot];
#elif defined(__aarch64__)
void** tcb; UNUSED(ofs);
#if defined(__APPLE__) // issue #343
#if defined(__APPLE__) // M1, issue #343
__asm__ volatile ("mrs %0, tpidrro_el0" : "=r" (tcb));
#else
__asm__ volatile ("mrs %0, tpidr_el0" : "=r" (tcb));
@ -734,7 +734,7 @@ static inline void mi_tls_slot_set(size_t slot, void* value) mi_attr_noexcept {
tcb[slot] = value;
#elif defined(__aarch64__)
void** tcb; UNUSED(ofs);
#if defined(__APPLE__) // issue #343
#if defined(__APPLE__) // M1, issue #343
__asm__ volatile ("mrs %0, tpidrro_el0" : "=r" (tcb));
#else
__asm__ volatile ("mrs %0, tpidr_el0" : "=r" (tcb));
@ -744,8 +744,13 @@ static inline void mi_tls_slot_set(size_t slot, void* value) mi_attr_noexcept {
}
static inline uintptr_t _mi_thread_id(void) mi_attr_noexcept {
// in all our targets, slot 0 is the pointer to the thread control block
#if defined(__aarch64__) && defined(__APPLE__) // M1
// on macOS on the M1, slot 0 does not seem to work, so we fall back to portable C for now. See issue #354
return (uintptr_t)&_mi_heap_default;
#else
// in all our other targets, slot 0 is the pointer to the thread control block
return (uintptr_t)mi_tls_slot(0);
#endif
}
#else
// otherwise use standard C