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gh-129748: Update mimalloc to use atomic store for mi_block_set_nextx#134238

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Merged
corona10 merged 1 commit intopython:mainfromcorona10:gh-129748
May 20, 2025
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8 changes: 4 additions & 4 deletionsInclude/internal/mimalloc/mimalloc/internal.h
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Original file line numberDiff line numberDiff line change
Expand Up@@ -634,10 +634,10 @@ static inline mi_block_t* mi_block_nextx( const void* null, const mi_block_t* bl
mi_track_mem_defined(block,sizeof(mi_block_t));
mi_block_t* next;
#ifdef MI_ENCODE_FREELIST
next = (mi_block_t*)mi_ptr_decode(null, block->next, keys);
next = (mi_block_t*)mi_ptr_decode(null,mi_atomic_load_relaxed(&block->next), keys);
#else
MI_UNUSED(keys); MI_UNUSED(null);
next = (mi_block_t*)block->next;
next = (mi_block_t*)mi_atomic_load_relaxed(&block->next);
#endif
mi_track_mem_noaccess(block,sizeof(mi_block_t));
return next;
Expand All@@ -646,10 +646,10 @@ static inline mi_block_t* mi_block_nextx( const void* null, const mi_block_t* bl
static inline void mi_block_set_nextx(const void* null, mi_block_t* block, const mi_block_t* next, const uintptr_t* keys) {
mi_track_mem_undefined(block,sizeof(mi_block_t));
#ifdef MI_ENCODE_FREELIST
block->next =mi_ptr_encode(null, next, keys);
mi_atomic_store_relaxed(&block->next,mi_ptr_encode(null, next, keys));
#else
MI_UNUSED(keys); MI_UNUSED(null);
block->next =(mi_encoded_t)next;
mi_atomic_store_relaxed(&block->next,(mi_encoded_t)next);
#endif
mi_track_mem_noaccess(block,sizeof(mi_block_t));
}
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2 changes: 1 addition & 1 deletionInclude/internal/mimalloc/mimalloc/types.h
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Original file line numberDiff line numberDiff line change
Expand Up@@ -235,7 +235,7 @@ typedef size_t mi_threadid_t;

// free lists contain blocks
typedefstructmi_block_s {
mi_encoded_tnext;
_Atomic(mi_encoded_t)next;
}mi_block_t;


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