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xs/i32s.xs  view on Meta::CPAN

        ShmHandle* h = INT2PTR(ShmHandle*, SvIV(SvRV(self_sv)));
        if (!h) return;
        sv_setiv(SvRV(self_sv), 0);
        shm_close_map(h);

bool
put(SV* self_sv, int32_t key, SV* value)
    CODE:
        EXTRACT_MAP("Data::HashMap::Shared::I32S", self_sv);
        EXTRACT_STR_VAL(value);
        RETVAL = shm_i32s_put(h, key, _vstr, (uint32_t)_vlen, _vutf8);
    OUTPUT:
        RETVAL

UV
set_multi(SV* self_sv, ...)
    CODE:
        EXTRACT_MAP("Data::HashMap::Shared::I32S", self_sv);
        if ((items - 1) % 2 != 0) croak("set_multi requires even number of arguments (key, value pairs)");
        uint32_t count = 0;
        if (h->shard_handles) {
            for (int i = 1; i < items; i += 2) {
                STRLEN _vl; const char *_vs = SvPV(ST(i+1), _vl);
                bool _vu = SvUTF8(ST(i+1)) ? 1 : 0;
                if (_vl > SHM_MAX_STR_LEN) croak("value too long (max 1GB)");
                count += shm_i32s_put(h, (int32_t)SvIV(ST(i)), _vs, (uint32_t)_vl, _vu);
            }
        } else {
            WRSEQ_GUARD(h);
            for (int i = 1; i < items; i += 2) {
                STRLEN _vl; const char *_vs = SvPV(ST(i+1), _vl);
                bool _vu = SvUTF8(ST(i+1)) ? 1 : 0;
                if (_vl > SHM_MAX_STR_LEN) croak("value too long (max 1GB)");
                count += shm_i32s_put_inner(h, (int32_t)SvIV(ST(i)), _vs, (uint32_t)_vl, _vu, SHM_TTL_USE_DEFAULT);
            }
        }
        RETVAL = count;
    OUTPUT:
        RETVAL

UV
remove_multi(SV* self_sv, ...)
    CODE:
        EXTRACT_MAP("Data::HashMap::Shared::I32S", self_sv);
        uint32_t count = 0;
        if (h->shard_handles) {
            for (int i = 1; i < items; i++)
                count += shm_i32s_remove(h, (int32_t)SvIV(ST(i)));
        } else {
            WRSEQ_GUARD(h);
            for (int i = 1; i < items; i++)
                count += shm_i32s_remove_inner(h, (int32_t)SvIV(ST(i)));
            if (count) shm_i32s_maybe_shrink(h);
        }
        RETVAL = count;
    OUTPUT:
        RETVAL

void
get_multi(SV* self_sv, ...)
    PPCODE:
        EXTRACT_MAP("Data::HashMap::Shared::I32S", self_sv);
        int nkeys = items - 1;
        if (nkeys == 0) XSRETURN_EMPTY;
        EXTEND(SP, nkeys);
        if (h->shard_handles) {
            for (int i = 0; i < nkeys; i++) {
                int32_t key = (int32_t)SvIV(ST(i + 1));
                const char *out_s; uint32_t out_l; bool out_u;
                if (shm_i32s_get(h, key, &out_s, &out_l, &out_u)) {
                    SV *sv = newSVpvn(out_s, out_l);
                    if (out_u) SvUTF8_on(sv);
                    mPUSHs(sv);
                } else PUSHs(&PL_sv_undef);
            }
        } else {
            ShmHeader *hdr = h->hdr;
            ShmNodeI32S *nodes = (ShmNodeI32S *)h->nodes;
            uint8_t *states = h->states;
            char *arena = h->arena;
            uint32_t now = h->expires_at ? shm_now() : 0;
            /* Phase 1: compute hashes and prefetch first probe positions */
            uint32_t *hashes = NULL;
            Newx(hashes, nkeys, uint32_t);
            SAVEFREEPV(hashes);
            RDLOCK_GUARD(h);
            uint32_t mask = hdr->table_cap - 1;
            for (int i = 0; i < nkeys; i++) {
                hashes[i] = shm_hash_int64((int64_t)(int32_t)SvIV(ST(i + 1)));
                __builtin_prefetch(&states[hashes[i] & mask], 0, 0);
                __builtin_prefetch(&nodes[hashes[i] & mask], 0, 0);
            }
            /* Phase 2: probe each key */
            for (int i = 0; i < nkeys; i++) {
                int32_t key = (int32_t)SvIV(ST(i + 1));
                uint32_t hash = hashes[i];
                uint32_t pos = hash & mask;
                uint8_t tag = SHM_MAKE_TAG(hash);
                int found = 0;
                uint32_t vidx = 0;
                for (uint32_t j = 0; j <= mask; j++) {
                    uint32_t idx = (pos + j) & mask;
                    uint8_t st = states[idx];
                    if (st == SHM_EMPTY) break;
                    if (st != tag) continue;
                    if (nodes[idx].key == key) {
                        if (h->expires_at && h->expires_at[idx] && now >= h->expires_at[idx]) break;
                        vidx = idx; found = 1; break;
                    }
                }
                if (found) {
                    char _vib[SHM_INLINE_MAX]; uint32_t vl;
                    const char *vp = shm_str_ptr(nodes[vidx].val_off, nodes[vidx].val_len, arena, _vib, &vl);
                    SV *sv = newSVpvn(vp, vl);
                    if (SHM_UNPACK_UTF8(nodes[vidx].val_len)) SvUTF8_on(sv);
                    mPUSHs(sv);
                } else PUSHs(&PL_sv_undef);
                /* Prefetch next key's probe position */
                if (i + 1 < nkeys) {
                    uint32_t npos = hashes[i + 1] & mask;
                    __builtin_prefetch(&states[npos], 0, 0);
                    __builtin_prefetch(&nodes[npos], 0, 0);
                }
            }
        }

void
get_with_ttl(SV* self_sv, int32_t key)
    PPCODE:
        EXTRACT_MAP("Data::HashMap::Shared::I32S", self_sv);
        const char *out_s; uint32_t out_l; bool out_u;
        int64_t out_ttl;
        if (!shm_i32s_get_with_ttl(h, key, &out_s, &out_l, &out_u, &out_ttl)) XSRETURN_EMPTY;
        EXTEND(SP, 2);
        SV *vsv = newSVpvn(out_s, out_l);
        if (out_u) SvUTF8_on(vsv);
        mPUSHs(vsv);
        if (out_ttl < 0) PUSHs(&PL_sv_undef);
        else mPUSHi(out_ttl);

SV*
stats(SV* self_sv)
    CODE:
        EXTRACT_MAP("Data::HashMap::Shared::I32S", self_sv);
                HV *hv = newHV();
        hv_store(hv, "size", 4, newSVuv(shm_i32s_size(h)), 0);
        hv_store(hv, "capacity", 8, newSVuv(shm_i32s_capacity(h)), 0);
        hv_store(hv, "max_entries", 11, newSVuv(shm_i32s_max_entries(h)), 0);
        hv_store(hv, "tombstones", 10, newSVuv(shm_i32s_tombstones(h)), 0);
        hv_store(hv, "mmap_size", 9, newSVuv(shm_i32s_mmap_size(h)), 0);
        hv_store(hv, "arena_used", 10, newSVuv(shm_i32s_arena_used(h)), 0);
        hv_store(hv, "arena_cap", 9, newSVuv(shm_i32s_arena_cap(h)), 0);
        hv_store(hv, "evictions", 9, newSVuv(shm_i32s_stat_evictions(h)), 0);
        hv_store(hv, "expired", 7, newSVuv(shm_i32s_stat_expired(h)), 0);
        hv_store(hv, "recoveries", 10, newSVuv(shm_i32s_stat_recoveries(h)), 0);
        hv_store(hv, "max_size", 8, newSVuv(shm_i32s_max_size(h)), 0);
        hv_store(hv, "ttl", 3, newSVuv(shm_i32s_ttl(h)), 0);
        RETVAL = newRV_noinc((SV*)hv);
    OUTPUT:
        RETVAL

bool
persist(SV* self_sv, int32_t key)
    CODE:
        EXTRACT_MAP("Data::HashMap::Shared::I32S", self_sv);
        RETVAL = shm_i32s_persist(h, key);
    OUTPUT:
        RETVAL

bool
set_ttl(SV* self_sv, int32_t key, UV ttl_sec)
    CODE:
        EXTRACT_MAP("Data::HashMap::Shared::I32S", self_sv);
        RETVAL = shm_i32s_set_ttl(h, key, (uint32_t)ttl_sec);
    OUTPUT:
        RETVAL

bool
put_ttl(SV* self_sv, int32_t key, SV* value, UV ttl_sec)
    CODE:
        EXTRACT_MAP("Data::HashMap::Shared::I32S", self_sv);
        EXTRACT_STR_VAL(value);
        REQUIRE_TTL(h);
        RETVAL = shm_i32s_put_ttl(h, key, _vstr, (uint32_t)_vlen, _vutf8, (uint32_t)ttl_sec);
    OUTPUT:
        RETVAL

UV
max_size(SV* self_sv)
    CODE:
        EXTRACT_MAP("Data::HashMap::Shared::I32S", self_sv);
        RETVAL = (UV)shm_i32s_max_size(h);
    OUTPUT:
        RETVAL

UV
ttl(SV* self_sv)
    CODE:
        EXTRACT_MAP("Data::HashMap::Shared::I32S", self_sv);
        RETVAL = (UV)shm_i32s_ttl(h);
    OUTPUT:
        RETVAL

SV*
get(SV* self_sv, int32_t key)
    CODE:
        EXTRACT_MAP("Data::HashMap::Shared::I32S", self_sv);
        const char* val; uint32_t val_len; bool val_utf8;
        if (!shm_i32s_get(h, key, &val, &val_len, &val_utf8)) XSRETURN_UNDEF;
        RETVAL = newSVpvn(val, val_len);
        if (val_utf8) SvUTF8_on(RETVAL);
    OUTPUT:
        RETVAL

bool
remove(SV* self_sv, int32_t key)
    CODE:
        EXTRACT_MAP("Data::HashMap::Shared::I32S", self_sv);
        RETVAL = shm_i32s_remove(h, key);
    OUTPUT:
        RETVAL

bool
exists(SV* self_sv, int32_t key)
    CODE:
        EXTRACT_MAP("Data::HashMap::Shared::I32S", self_sv);
        RETVAL = shm_i32s_exists(h, key);
    OUTPUT:
        RETVAL

UV
size(SV* self_sv)
    CODE:
        EXTRACT_MAP("Data::HashMap::Shared::I32S", self_sv);
        RETVAL = (UV)shm_i32s_size(h);
    OUTPUT:
        RETVAL

UV
max_entries(SV* self_sv)
    CODE:
        EXTRACT_MAP("Data::HashMap::Shared::I32S", self_sv);
        RETVAL = (UV)shm_i32s_max_entries(h);
    OUTPUT:
        RETVAL

void
keys(SV* self_sv)
    PPCODE:
        EXTRACT_MAP("Data::HashMap::Shared::I32S", self_sv);
        uint32_t ns = h->shard_handles ? h->num_shards : 1;
        for (uint32_t si = 0; si < ns; si++) {
            ShmHandle *sh = h->shard_handles ? h->shard_handles[si] : h;
            ShmHeader *hdr = sh->hdr;
            ShmNodeI32S *nodes = (ShmNodeI32S *)sh->nodes;
            uint32_t now = sh->expires_at ? shm_now() : 0;
            RDLOCK_GUARD(sh);
            EXTEND(SP, hdr->size);
            for (uint32_t i = 0; i < hdr->table_cap; i++) {
                if (SHM_IS_LIVE(sh->states[i]) && !SHM_IS_EXPIRED(sh, i, now))
                    mXPUSHi(nodes[i].key);
            }
        }

void
values(SV* self_sv)
    PPCODE:
        EXTRACT_MAP("Data::HashMap::Shared::I32S", self_sv);
        uint32_t ns = h->shard_handles ? h->num_shards : 1;
        for (uint32_t si = 0; si < ns; si++) {
            ShmHandle *sh = h->shard_handles ? h->shard_handles[si] : h;
            ShmHeader *hdr = sh->hdr;
            ShmNodeI32S *nodes = (ShmNodeI32S *)sh->nodes;
            uint32_t now = sh->expires_at ? shm_now() : 0;
            RDLOCK_GUARD(sh);
            EXTEND(SP, hdr->size);
            for (uint32_t i = 0; i < hdr->table_cap; i++) {
                if (SHM_IS_LIVE(sh->states[i]) && !SHM_IS_EXPIRED(sh, i, now)) {
                    char _ib[SHM_INLINE_MAX]; uint32_t vlen;
                    const char *vp = shm_str_ptr(nodes[i].val_off, nodes[i].val_len, sh->arena, _ib, &vlen);
                    SV* sv = newSVpvn(vp, vlen);
                    if (SHM_UNPACK_UTF8(nodes[i].val_len)) SvUTF8_on(sv);
                    mXPUSHs(sv);
                }
            }
        }

void
items(SV* self_sv)
    PPCODE:
        EXTRACT_MAP("Data::HashMap::Shared::I32S", self_sv);
        uint32_t ns = h->shard_handles ? h->num_shards : 1;
        for (uint32_t si = 0; si < ns; si++) {
            ShmHandle *sh = h->shard_handles ? h->shard_handles[si] : h;
            ShmHeader *hdr = sh->hdr;
            ShmNodeI32S *nodes = (ShmNodeI32S *)sh->nodes;
            uint32_t now = sh->expires_at ? shm_now() : 0;
            RDLOCK_GUARD(sh);
            EXTEND(SP, hdr->size * 2);
            for (uint32_t i = 0; i < hdr->table_cap; i++) {
                if (SHM_IS_LIVE(sh->states[i]) && !SHM_IS_EXPIRED(sh, i, now)) {
                    mXPUSHi(nodes[i].key);
                    char _ib[SHM_INLINE_MAX]; uint32_t vlen;
                    const char *vp = shm_str_ptr(nodes[i].val_off, nodes[i].val_len, sh->arena, _ib, &vlen);
                    SV* sv = newSVpvn(vp, vlen);
                    if (SHM_UNPACK_UTF8(nodes[i].val_len)) SvUTF8_on(sv);
                    mXPUSHs(sv);
                }
            }
        }


void
each(SV* self_sv)
    PPCODE:
        EXTRACT_MAP("Data::HashMap::Shared::I32S", self_sv);
        int32_t out_key;
        const char *out_val; uint32_t out_vlen; bool out_vutf8;
        if (shm_i32s_each(h, &out_key, &out_val, &out_vlen, &out_vutf8)) {
            EXTEND(SP, 2);
            mXPUSHi(out_key);
            SV* sv = newSVpvn(out_val, out_vlen);
            if (out_vutf8) SvUTF8_on(sv);
            mXPUSHs(sv);
            XSRETURN(2);
        }
        shm_i32s_flush_deferred(h);
        XSRETURN_EMPTY;

void
iter_reset(SV* self_sv)
    CODE:
        EXTRACT_MAP("Data::HashMap::Shared::I32S", self_sv);
        shm_i32s_iter_reset(h);
        shm_i32s_flush_deferred(h);

void
clear(SV* self_sv)
    CODE:
        EXTRACT_MAP("Data::HashMap::Shared::I32S", self_sv);
        shm_i32s_clear(h);

SV*
to_hash(SV* self_sv)
    CODE:
        EXTRACT_MAP("Data::HashMap::Shared::I32S", self_sv);
        HV* hv = newHV();
        uint32_t ns = h->shard_handles ? h->num_shards : 1;
        for (uint32_t si = 0; si < ns; si++) {
            ShmHandle *sh = h->shard_handles ? h->shard_handles[si] : h;
            ShmHeader *hdr = sh->hdr;
            ShmNodeI32S *nodes = (ShmNodeI32S *)sh->nodes;
            uint32_t now = sh->expires_at ? shm_now() : 0;
            RDLOCK_GUARD(sh);
            for (uint32_t i = 0; i < hdr->table_cap; i++) {
                if (SHM_IS_LIVE(sh->states[i]) && !SHM_IS_EXPIRED(sh, i, now)) {
                    char _ib[SHM_INLINE_MAX]; uint32_t vlen;
                    const char *vp = shm_str_ptr(nodes[i].val_off, nodes[i].val_len, sh->arena, _ib, &vlen);
                    SV* val = newSVpvn(vp, vlen);
                    if (SHM_UNPACK_UTF8(nodes[i].val_len)) SvUTF8_on(val);
                    char kbuf[24];
                    int klen = my_snprintf(kbuf, sizeof(kbuf), "%" IVdf, (IV)nodes[i].key);
                    if (!hv_store(hv, kbuf, klen, val, 0)) SvREFCNT_dec(val);
                }
            }
        }

        RETVAL = newRV_noinc((SV*)hv);
    OUTPUT:
        RETVAL

SV*
get_or_set(SV* self_sv, int32_t key, SV* default_sv)
    CODE:
        EXTRACT_MAP("Data::HashMap::Shared::I32S", self_sv);
        const char *out_str; uint32_t out_len; bool out_utf8;
        EXTRACT_STR_VAL(default_sv);
        int rc = shm_i32s_get_or_set(h, key, _vstr, (uint32_t)_vlen, _vutf8, &out_str, &out_len, &out_utf8);
        if (!rc) XSRETURN_UNDEF;
        RETVAL = newSVpvn(out_str, out_len);
        if (out_utf8) SvUTF8_on(RETVAL);
    OUTPUT:
        RETVAL

SV*
ttl_remaining(SV* self_sv, int32_t key)
    CODE:
        EXTRACT_MAP("Data::HashMap::Shared::I32S", self_sv);
        int64_t remaining = shm_i32s_ttl_remaining(h, key);
        if (remaining < 0) XSRETURN_UNDEF;
        RETVAL = newSViv(remaining);
    OUTPUT:
        RETVAL

UV
capacity(SV* self_sv)
    CODE:
        EXTRACT_MAP("Data::HashMap::Shared::I32S", self_sv);
        RETVAL = (UV)shm_i32s_capacity(h);
    OUTPUT:
        RETVAL

UV
tombstones(SV* self_sv)
    CODE:
        EXTRACT_MAP("Data::HashMap::Shared::I32S", self_sv);
        RETVAL = (UV)shm_i32s_tombstones(h);
    OUTPUT:
        RETVAL

SV*
cursor(SV* self_sv)
    CODE:
        EXTRACT_MAP("Data::HashMap::Shared::I32S", self_sv);
        ShmCursor* c = shm_cursor_create(h);
        if (!c) croak("Failed to allocate cursor");
        RETVAL = sv_setref_pv(newSV(0), "Data::HashMap::Shared::I32S::Cursor", (void*)c);
    OUTPUT:
        RETVAL

SV*
take(SV* self_sv, int32_t key)
    CODE:
        EXTRACT_MAP("Data::HashMap::Shared::I32S", self_sv);
        const char *out_str; uint32_t out_len; bool out_utf8;
        if (!shm_i32s_take(h, key, &out_str, &out_len, &out_utf8)) XSRETURN_UNDEF;
        RETVAL = newSVpvn(out_str, out_len);
        if (out_utf8) SvUTF8_on(RETVAL);
    OUTPUT:
        RETVAL

void
pop(SV* self_sv)
    PPCODE:
        EXTRACT_MAP("Data::HashMap::Shared::I32S", self_sv);
        int32_t out_key;
        const char *out_val; uint32_t out_vlen; bool out_vutf8;
        if (!shm_i32s_pop(h, &out_key, &out_val, &out_vlen, &out_vutf8)) XSRETURN_EMPTY;
        EXTEND(SP, 2);
        mPUSHi(out_key);
        SV *vsv = newSVpvn(out_val, out_vlen);
        if (out_vutf8) SvUTF8_on(vsv);
        mPUSHs(vsv);

void
shift(SV* self_sv)
    PPCODE:
        EXTRACT_MAP("Data::HashMap::Shared::I32S", self_sv);
        int32_t out_key;
        const char *out_val; uint32_t out_vlen; bool out_vutf8;
        if (!shm_i32s_shift(h, &out_key, &out_val, &out_vlen, &out_vutf8)) XSRETURN_EMPTY;
        EXTEND(SP, 2);
        mPUSHi(out_key);
        SV *vsv = newSVpvn(out_val, out_vlen);
        if (out_vutf8) SvUTF8_on(vsv);
        mPUSHs(vsv);

void
drain(SV* self_sv, UV limit)
    PPCODE:
        EXTRACT_MAP("Data::HashMap::Shared::I32S", self_sv);
        if (limit == 0) XSRETURN_EMPTY;
        shm_i32s_drain_entry *entries;
        Newxz(entries, limit, shm_i32s_drain_entry);

        SAVEFREEPV(entries);
        char *buf = NULL; uint32_t buf_cap = 0;
        uint32_t n = shm_i32s_drain(h, (uint32_t)limit, entries, &buf, &buf_cap);
        if (buf) SAVEDESTRUCTOR_X(shm_free_cleanup, buf);

        EXTEND(SP, n * 2);
        for (uint32_t i = 0; i < n; i++) {
            mPUSHi(entries[i].key);
            SV *vsv = newSVpvn(buf + entries[i].val_off, entries[i].val_len);
            if (entries[i].val_utf8) SvUTF8_on(vsv);
            mPUSHs(vsv);
        }


UV
flush_expired(SV* self_sv)
    CODE:
        EXTRACT_MAP("Data::HashMap::Shared::I32S", self_sv);
        RETVAL = (UV)shm_i32s_flush_expired(h);
    OUTPUT:
        RETVAL

void
flush_expired_partial(SV* self_sv, UV limit)
    PPCODE:
        EXTRACT_MAP("Data::HashMap::Shared::I32S", self_sv);
        int done = 0;
        uint32_t flushed = shm_i32s_flush_expired_partial(h, (uint32_t)limit, &done);
        EXTEND(SP, 2);
        mPUSHu(flushed);
        mPUSHi(done);

UV
mmap_size(SV* self_sv)
    CODE:
        EXTRACT_MAP("Data::HashMap::Shared::I32S", self_sv);
        RETVAL = (UV)shm_i32s_mmap_size(h);
    OUTPUT:
        RETVAL

bool
touch(SV* self_sv, int32_t key)
    CODE:
        EXTRACT_MAP("Data::HashMap::Shared::I32S", self_sv);
        RETVAL = shm_i32s_touch(h, key);
    OUTPUT:
        RETVAL

bool
reserve(SV* self_sv, UV target)
    CODE:
        EXTRACT_MAP("Data::HashMap::Shared::I32S", self_sv);
        RETVAL = shm_i32s_reserve(h, (uint32_t)target);
    OUTPUT:
        RETVAL

UV
stat_evictions(SV* self_sv)
    CODE:
        EXTRACT_MAP("Data::HashMap::Shared::I32S", self_sv);
        RETVAL = (UV)shm_i32s_stat_evictions(h);
    OUTPUT:
        RETVAL

UV
stat_expired(SV* self_sv)
    CODE:
        EXTRACT_MAP("Data::HashMap::Shared::I32S", self_sv);
        RETVAL = (UV)shm_i32s_stat_expired(h);
    OUTPUT:
        RETVAL

UV
stat_recoveries(SV* self_sv)
    CODE:
        EXTRACT_MAP("Data::HashMap::Shared::I32S", self_sv);
        RETVAL = (UV)shm_i32s_stat_recoveries(h);
    OUTPUT:
        RETVAL

UV
arena_used(SV* self_sv)
    CODE:
        EXTRACT_MAP("Data::HashMap::Shared::I32S", self_sv);
        RETVAL = (UV)shm_i32s_arena_used(h);

xs/i32s.xs  view on Meta::CPAN

bool
cas(SV* self_sv, int32_t key, SV* expected_sv, SV* desired_sv)
    CODE:
        EXTRACT_MAP("Data::HashMap::Shared::I32S", self_sv);
        EXTRACT_STR_EXPECTED_DESIRED(expected_sv, desired_sv);
        RETVAL = shm_i32s_cas(h, key, _estr, (uint32_t)_elen, _dstr, (uint32_t)_dlen, _dutf8);
    OUTPUT:
        RETVAL

SV*
cas_take(SV* self_sv, int32_t key, SV* expected_sv)
    CODE:
        EXTRACT_MAP("Data::HashMap::Shared::I32S", self_sv);
        EXTRACT_STR_EXPECTED(expected_sv);
        const char *out_s; uint32_t out_l; bool out_u;
        if (!shm_i32s_cas_take(h, key, _estr, (uint32_t)_elen, &out_s, &out_l, &out_u)) XSRETURN_UNDEF;
        RETVAL = newSVpvn(out_s, out_l);
        if (out_u) SvUTF8_on(RETVAL);
    OUTPUT:
        RETVAL

SV*
path(SV* self_sv)
    CODE:
        EXTRACT_MAP("Data::HashMap::Shared::I32S", self_sv);
        RETVAL = h->path ? newSVpv(h->path, 0) : &PL_sv_undef;
    OUTPUT:
        RETVAL

bool
unlink(SV* self_or_class, ...)
    CODE:
        if (SvROK(self_or_class) && SvOBJECT(SvRV(self_or_class))) {
            ShmHandle* h = INT2PTR(ShmHandle*, SvIV(SvRV(self_or_class)));
            if (!h) croak("Attempted to use a destroyed Data::HashMap::Shared::I32S object");
            RETVAL = shm_unlink_sharded(h);
        } else {
            if (items < 2) croak("Usage: Data::HashMap::Shared::I32S->unlink($path)");
            RETVAL = shm_unlink_path(SvPV_nolen(ST(1)));
        }
    OUTPUT:
        RETVAL

MODULE = Data::HashMap::Shared    PACKAGE = Data::HashMap::Shared::I32S::Cursor
PROTOTYPES: DISABLE

void
DESTROY(SV* self_sv)
    CODE:
        if (!SvROK(self_sv)) return;
        ShmCursor* c = INT2PTR(ShmCursor*, SvIV(SvRV(self_sv)));
        if (!c) return;
        ShmHandle* h = c->current;
        shm_cursor_destroy(c);
        if (h) shm_i32s_flush_deferred(h);
        sv_setiv(SvRV(self_sv), 0);

void
next(SV* self_sv)
    PPCODE:
        EXTRACT_CURSOR("Data::HashMap::Shared::I32S::Cursor", self_sv);
        int32_t out_key;
        const char *out_val; uint32_t out_vlen; bool out_vutf8;
        if (shm_i32s_cursor_next(c, &out_key, &out_val, &out_vlen, &out_vutf8)) {
            EXTEND(SP, 2);
            mXPUSHi(out_key);
            SV* sv = newSVpvn(out_val, out_vlen);
            if (out_vutf8) SvUTF8_on(sv);
            mXPUSHs(sv);
            XSRETURN(2);
        }
        XSRETURN_EMPTY;

void
reset(SV* self_sv)
    CODE:
        EXTRACT_CURSOR("Data::HashMap::Shared::I32S::Cursor", self_sv);
        shm_i32s_cursor_reset(c);

bool
seek(SV* self_sv, int32_t key)
    CODE:
        EXTRACT_CURSOR("Data::HashMap::Shared::I32S::Cursor", self_sv);
        RETVAL = shm_i32s_cursor_seek(c, key);
    OUTPUT:
        RETVAL