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https://github.com/python/cpython
synced 2024-10-02 02:31:48 +00:00
df3173d28e
This is strictly about moving the "obmalloc" runtime state from `_PyRuntimeState` to `PyInterpreterState`. Doing so improves isolation between interpreters, specifically most of the memory (incl. objects) allocated for each interpreter's use. This is important for a per-interpreter GIL, but such isolation is valuable even without it. FWIW, a per-interpreter obmalloc is the proverbial canary-in-the-coalmine when it comes to the isolation of objects between interpreters. Any object that leaks (unintentionally) to another interpreter is highly likely to cause a crash (on debug builds at least). That's a useful thing to know, relative to interpreter isolation.
74 lines
2 KiB
C
74 lines
2 KiB
C
#ifndef Py_INTERNAL_OBMALLOC_INIT_H
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#define Py_INTERNAL_OBMALLOC_INIT_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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#ifndef Py_BUILD_CORE
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# error "this header requires Py_BUILD_CORE define"
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#endif
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/****************************************************/
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/* the default object allocator's state initializer */
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#define PTA(pools, x) \
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((poolp )((uint8_t *)&(pools.used[2*(x)]) - 2*sizeof(pymem_block *)))
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#define PT(p, x) PTA(p, x), PTA(p, x)
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#define PT_8(p, start) \
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PT(p, start), \
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PT(p, start+1), \
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PT(p, start+2), \
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PT(p, start+3), \
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PT(p, start+4), \
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PT(p, start+5), \
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PT(p, start+6), \
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PT(p, start+7)
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#if NB_SMALL_SIZE_CLASSES <= 8
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# define _obmalloc_pools_INIT(p) \
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{ PT_8(p, 0) }
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#elif NB_SMALL_SIZE_CLASSES <= 16
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# define _obmalloc_pools_INIT(p) \
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{ PT_8(p, 0), PT_8(p, 8) }
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#elif NB_SMALL_SIZE_CLASSES <= 24
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# define _obmalloc_pools_INIT(p) \
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{ PT_8(p, 0), PT_8(p, 8), PT_8(p, 16) }
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#elif NB_SMALL_SIZE_CLASSES <= 32
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# define _obmalloc_pools_INIT(p) \
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{ PT_8(p, 0), PT_8(p, 8), PT_8(p, 16), PT_8(p, 24) }
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#elif NB_SMALL_SIZE_CLASSES <= 40
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# define _obmalloc_pools_INIT(p) \
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{ PT_8(p, 0), PT_8(p, 8), PT_8(p, 16), PT_8(p, 24), PT_8(p, 32) }
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#elif NB_SMALL_SIZE_CLASSES <= 48
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# define _obmalloc_pools_INIT(p) \
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{ PT_8(p, 0), PT_8(p, 8), PT_8(p, 16), PT_8(p, 24), PT_8(p, 32), PT_8(p, 40) }
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#elif NB_SMALL_SIZE_CLASSES <= 56
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# define _obmalloc_pools_INIT(p) \
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{ PT_8(p, 0), PT_8(p, 8), PT_8(p, 16), PT_8(p, 24), PT_8(p, 32), PT_8(p, 40), PT_8(p, 48) }
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#elif NB_SMALL_SIZE_CLASSES <= 64
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# define _obmalloc_pools_INIT(p) \
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{ PT_8(p, 0), PT_8(p, 8), PT_8(p, 16), PT_8(p, 24), PT_8(p, 32), PT_8(p, 40), PT_8(p, 48), PT_8(p, 56) }
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#else
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# error "NB_SMALL_SIZE_CLASSES should be less than 64"
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#endif
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#define _obmalloc_global_state_INIT \
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{ \
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.dump_debug_stats = -1, \
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}
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#define _obmalloc_state_INIT(obmalloc) \
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{ \
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.pools = { \
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.used = _obmalloc_pools_INIT(obmalloc.pools), \
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}, \
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}
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#ifdef __cplusplus
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}
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#endif
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#endif // !Py_INTERNAL_OBMALLOC_INIT_H
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