forked from lei.chen/myxce
Rongsong Shen
eaf1801d6d
Add kvtab_foreach walk primitive (P0-14) to kv.c/kv.h, then implement kvmgr_capture_keys in kvmgr.c that deep-copies all key→index mappings into a malloc'd slot_key_t[] array safe to read after the write lock is released during checkpoint serialization (Part 3.8). Key design points: - Both kvtab_foreach and kvmgr_capture_keys take var (RTTI data pointer) and use RTTI_DATA_TO_OBJ internally — the RTTI framework's makeInstance returns the data region pointer, not the meta_obj_t header pointer - String keys are copied via strncpy into slot_key_t.key[XCE_MAXNAME_LEN] - Integer keys are formatted as decimal strings via snprintf - Two-pass approach: count live entries first, allocate, then fill - Tests cover string kvmgr (3 entries), empty kvmgr, and deep-copy safety
44 lines
1 KiB
C
44 lines
1 KiB
C
#if !defined(__KVMGR_H__)
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#define __KVMGR_H__ 1
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#include "htab.h"
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#include "mylock.h"
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#include "xce/types.h"
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#include "xlist.h"
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#include "zarray.h"
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#include "persist.h"
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typedef enum {
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KVMGR_KEY_INT = 0,
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KVMGR_KEY_STRING
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} kvmgr_key_type_t;
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typedef struct {
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kvmgr_key_type_t key_type;
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uint32_t nslots;
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uint32_t delta;
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destroy_fn_t datakiller;
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} kvmgr_params_t;
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extern typeinfo_t xkvmgr_type;
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/*
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* kvmgr_capture_keys — capture key→index mappings for checkpoint
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* serialization (Part 3.8).
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*
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* Caller MUST hold the kvmgr write lock for the full duration of
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* this call. The function allocates *keys_out and populates it with
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* *n_keys_out entries. Each entry's key[] field is an owned deep
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* copy that remains valid after the write lock is released.
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*
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* Caller must free(*keys_out) when done.
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*
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* Returns 0 on success.
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* Returns -ENOMEM if allocation fails.
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*/
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int kvmgr_capture_keys(var kvmgr,
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slot_key_t** keys_out,
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size_t* n_keys_out);
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#endif
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