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[3.13] gh-129748: Update mimalloc to use atomic store for mi_block_set_nextx (GH-134238) #134353

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Merged
merged 1 commit into from
May 20, 2025
Merged

[3.13] gh-129748: Update mimalloc to use atomic store for mi_block_set_nextx (GH-134238) #134353

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8 changes: 4 additions & 4 deletions Include/internal/mimalloc/mimalloc/internal.h
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Original file line number Diff line number Diff 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 deletion Include/internal/mimalloc/mimalloc/types.h
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Original file line number Diff line number Diff line change
Expand Up @@ -235,7 +235,7 @@ typedef size_t mi_threadid_t;

// free lists contain blocks
typedef struct mi_block_s {
mi_encoded_t next;
_Atomic(mi_encoded_t) next;
} mi_block_t;


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