mdbx: minor refine idl functions.

This commit is contained in:
Leo Yuriev 2017-05-24 15:50:03 +03:00
parent 924e81ed92
commit 96b9af0b4d
2 changed files with 286 additions and 308 deletions

View File

@ -370,13 +370,6 @@ typedef MDBX_ID2 *MDBX_ID2L;
/* Current max length of an mdbx_midl_alloc()ed IDL */
#define MDBX_IDL_ALLOCLEN(ids) ((ids)[-1])
/* Append ID to IDL. The IDL must be big enough. */
#define mdbx_midl_xappend(idl, id) \
do { \
pgno_t *xidl = (idl), xlen = ++(xidl[0]); \
xidl[xlen] = (id); \
} while (0)
/*----------------------------------------------------------------------------*/
/* Internal structures */
@ -1069,3 +1062,17 @@ static __inline void SETDSZ(MDBX_node *node, unsigned size) {
/* Check for misused dbi handles */
#define TXN_DBI_CHANGED(txn, dbi) \
((txn)->mt_dbiseqs[dbi] != (txn)->mt_env->me_dbiseqs[dbi])
/* LY: fast enough on most systems
*
* /
* | -1, a < b
* cmp2int(a,b) = < 0, a == b
* | 1, a > b
* \
*/
#if 1
#define mdbx_cmp2int(a, b) (((b) > (a)) ? -1 : (a) > (b))
#else
#define mdbx_cmp2int(a, b) (((a) > (b)) - ((b) > (a)))
#endif

View File

@ -156,78 +156,332 @@ __cold void mdbx_rthc_remove(mdbx_thread_key_t key) {
/*----------------------------------------------------------------------------*/
/* Allocate an IDL.
* Allocates memory for an IDL of the given size.
* Returns IDL on success, NULL on failure. */
static MDBX_IDL mdbx_midl_alloc(unsigned size) {
MDBX_IDL ids = malloc((size + 2) * sizeof(pgno_t));
if (likely(ids)) {
*ids++ = size;
*ids = 0;
}
return ids;
}
/* Free an IDL.
* [in] ids The IDL to free. */
static void mdbx_midl_free(MDBX_IDL ids) {
if (ids)
free(ids - 1);
}
/* Append ID to IDL. The IDL must be big enough. */
static __inline void mdbx_midl_xappend(MDBX_IDL idl, pgno_t id) {
assert(idl[0] + (size_t)1 < MDBX_IDL_ALLOCLEN(idl));
idl[idl[0] += 1] = id;
}
/* Search for an ID in an IDL.
* [in] ids The IDL to search.
* [in] id The ID to search for.
* Returns The index of the first ID greater than or equal to id. */
static unsigned mdbx_midl_search(MDBX_IDL ids, pgno_t id);
static unsigned __hot mdbx_midl_search(MDBX_IDL ids, pgno_t id) {
/* binary search of id in ids
* if found, returns position of id
* if not found, returns first position greater than id */
unsigned base = 0;
unsigned cursor = 1;
int val = 0;
unsigned n = ids[0];
/* Allocate an IDL.
* Allocates memory for an IDL of the given size.
* Returns IDL on success, NULL on failure. */
static MDBX_IDL mdbx_midl_alloc(int num);
while (n > 0) {
unsigned pivot = n >> 1;
cursor = base + pivot + 1;
val = mdbx_cmp2int(ids[cursor], id);
/* Free an IDL.
* [in] ids The IDL to free. */
static void mdbx_midl_free(MDBX_IDL ids);
if (val < 0) {
n = pivot;
} else if (val > 0) {
base = cursor;
n -= pivot + 1;
} else {
return cursor;
}
}
if (val > 0)
++cursor;
return cursor;
}
/* Shrink an IDL.
* Return the IDL to the default size if it has grown larger.
* [in,out] idp Address of the IDL to shrink. */
static void mdbx_midl_shrink(MDBX_IDL *idp);
static void mdbx_midl_shrink(MDBX_IDL *idp) {
MDBX_IDL ids = *idp - 1;
if (unlikely(*ids > MDBX_IDL_UM_MAX)) {
/* shrink to MDBX_IDL_UM_MAX */
ids = realloc(ids, (MDBX_IDL_UM_MAX + 2) * sizeof(pgno_t));
if (likely(ids)) {
*ids++ = MDBX_IDL_UM_MAX;
*idp = ids;
}
}
}
/* Grow an IDL.
* Return the IDL to the size growed by given number.
* [in,out] idp Address of the IDL to grow. */
static int mdbx_midl_grow(MDBX_IDL *idp, unsigned num) {
MDBX_IDL idn = *idp - 1;
/* grow it */
idn = realloc(idn, (*idn + num + 2) * sizeof(pgno_t));
if (unlikely(!idn))
return MDBX_ENOMEM;
*idn++ += num;
*idp = idn;
return 0;
}
/* Make room for num additional elements in an IDL.
* [in,out] idp Address of the IDL.
* [in] num Number of elements to make room for.
* Returns 0 on success, MDBX_ENOMEM on failure. */
static int mdbx_midl_need(MDBX_IDL *idp, unsigned num);
static int mdbx_midl_need(MDBX_IDL *idp, unsigned num) {
MDBX_IDL ids = *idp;
num += ids[0];
if (num > ids[-1]) {
num = (num + num / 4 + (256 + 2)) & -256;
ids = realloc(ids - 1, num * sizeof(pgno_t));
if (unlikely(!ids))
return MDBX_ENOMEM;
*ids++ = num - 2;
*idp = ids;
}
return 0;
}
/* Append an ID onto an IDL.
* [in,out] idp Address of the IDL to append to.
* [in] id The ID to append.
* Returns 0 on success, MDBX_ENOMEM if the IDL is too large. */
static int mdbx_midl_append(MDBX_IDL *idp, pgno_t id);
static int mdbx_midl_append(MDBX_IDL *idp, pgno_t id) {
MDBX_IDL ids = *idp;
/* Too big? */
if (ids[0] >= ids[-1]) {
if (mdbx_midl_grow(idp, MDBX_IDL_UM_MAX))
return MDBX_ENOMEM;
ids = *idp;
}
ids[0]++;
ids[ids[0]] = id;
return 0;
}
/* Append an IDL onto an IDL.
* [in,out] idp Address of the IDL to append to.
* [in] app The IDL to append.
* Returns 0 on success, MDBX_ENOMEM if the IDL is too large. */
static int mdbx_midl_append_list(MDBX_IDL *idp, MDBX_IDL app);
static int mdbx_midl_append_list(MDBX_IDL *idp, MDBX_IDL app) {
MDBX_IDL ids = *idp;
/* Too big? */
if (ids[0] + app[0] >= ids[-1]) {
if (mdbx_midl_grow(idp, app[0]))
return MDBX_ENOMEM;
ids = *idp;
}
memcpy(&ids[ids[0] + 1], &app[1], app[0] * sizeof(pgno_t));
ids[0] += app[0];
return 0;
}
/* Append an ID range onto an IDL.
* [in,out] idp Address of the IDL to append to.
* [in] id The lowest ID to append.
* [in] n Number of IDs to append.
* Returns 0 on success, MDBX_ENOMEM if the IDL is too large. */
static int mdbx_midl_append_range(MDBX_IDL *idp, pgno_t id, unsigned n);
static int mdbx_midl_append_range(MDBX_IDL *idp, pgno_t id, unsigned n) {
pgno_t *ids = *idp, len = ids[0];
/* Too big? */
if (len + n > ids[-1]) {
if (mdbx_midl_grow(idp, n | MDBX_IDL_UM_MAX))
return MDBX_ENOMEM;
ids = *idp;
}
ids[0] = len + n;
ids += len;
while (n)
ids[n--] = id++;
return 0;
}
/* Merge an IDL onto an IDL. The destination IDL must be big enough.
* [in] idl The IDL to merge into.
* [in] merge The IDL to merge. */
static void mdbx_midl_xmerge(MDBX_IDL idl, MDBX_IDL merge);
static void __hot mdbx_midl_xmerge(MDBX_IDL idl, MDBX_IDL merge) {
pgno_t old_id, merge_id, i = merge[0], j = idl[0], k = i + j, total = k;
idl[0] = ~(pgno_t)0; /* delimiter for idl scan below */
old_id = idl[j];
while (i) {
merge_id = merge[i--];
for (; old_id < merge_id; old_id = idl[--j])
idl[k--] = old_id;
idl[k--] = merge_id;
}
idl[0] = total;
}
/* Sort an IDL.
* [in,out] ids The IDL to sort. */
static void mdbx_midl_sort(MDBX_IDL ids);
static void __hot mdbx_midl_sort(MDBX_IDL ids) {
/* Max possible depth of int-indexed tree * 2 items/level */
int istack[sizeof(int) * CHAR_BIT * 2];
int i, j, k, l, ir, jstack;
pgno_t a;
/* Quicksort + Insertion sort for small arrays */
#define MIDL_SMALL 8
#define MIDL_SWAP(a, b) \
do { \
pgno_t tmp_pgno = (a); \
(a) = (b); \
(b) = tmp_pgno; \
} while (0)
ir = (int)ids[0];
l = 1;
jstack = 0;
for (;;) {
if (ir - l < MIDL_SMALL) { /* Insertion sort */
for (j = l + 1; j <= ir; j++) {
a = ids[j];
for (i = j - 1; i >= 1; i--) {
if (ids[i] >= a)
break;
ids[i + 1] = ids[i];
}
ids[i + 1] = a;
}
if (jstack == 0)
break;
ir = istack[jstack--];
l = istack[jstack--];
} else {
k = (l + ir) >> 1; /* Choose median of left, center, right */
MIDL_SWAP(ids[k], ids[l + 1]);
if (ids[l] < ids[ir])
MIDL_SWAP(ids[l], ids[ir]);
if (ids[l + 1] < ids[ir])
MIDL_SWAP(ids[l + 1], ids[ir]);
if (ids[l] < ids[l + 1])
MIDL_SWAP(ids[l], ids[l + 1]);
i = l + 1;
j = ir;
a = ids[l + 1];
for (;;) {
do
i++;
while (ids[i] > a);
do
j--;
while (ids[j] < a);
if (j < i)
break;
MIDL_SWAP(ids[i], ids[j]);
}
ids[l + 1] = ids[j];
ids[j] = a;
jstack += 2;
if (ir - i + 1 >= j - l) {
istack[jstack] = ir;
istack[jstack - 1] = i;
ir = j - 1;
} else {
istack[jstack] = j - 1;
istack[jstack - 1] = l;
l = i;
}
}
}
#undef MIDL_SMALL
#undef MIDL_SWAP
}
/* Search for an ID in an ID2L.
* [in] ids The ID2L to search.
* [in] id The ID to search for.
* Returns The index of the first ID2 whose mid member is greater than
* or equal to id. */
static unsigned mdbx_mid2l_search(MDBX_ID2L ids, pgno_t id);
static unsigned __hot mdbx_mid2l_search(MDBX_ID2L ids, pgno_t id) {
/* binary search of id in ids
* if found, returns position of id
* if not found, returns first position greater than id */
unsigned base = 0;
unsigned cursor = 1;
int val = 0;
unsigned n = (unsigned)ids[0].mid;
while (n > 0) {
unsigned pivot = n >> 1;
cursor = base + pivot + 1;
val = mdbx_cmp2int(id, ids[cursor].mid);
if (val < 0) {
n = pivot;
} else if (val > 0) {
base = cursor;
n -= pivot + 1;
} else {
return cursor;
}
}
if (val > 0)
++cursor;
return cursor;
}
/* Insert an ID2 into a ID2L.
* [in,out] ids The ID2L to insert into.
* [in] id The ID2 to insert.
* Returns 0 on success, -1 if the ID was already present in the ID2L. */
static int mdbx_mid2l_insert(MDBX_ID2L ids, MDBX_ID2 *id);
static int mdbx_mid2l_insert(MDBX_ID2L ids, MDBX_ID2 *id) {
unsigned x = mdbx_mid2l_search(ids, id->mid);
if (unlikely(x < 1))
return /* internal error */ -2;
if (x <= ids[0].mid && ids[x].mid == id->mid)
return /* duplicate */ -1;
if (unlikely(ids[0].mid >= MDBX_IDL_UM_MAX))
return /* too big */ -2;
/* insert id */
ids[0].mid++;
for (unsigned i = (unsigned)ids[0].mid; i > x; i--)
ids[i] = ids[i - 1];
ids[x] = *id;
return 0;
}
/* Append an ID2 into a ID2L.
* [in,out] ids The ID2L to append into.
* [in] id The ID2 to append.
* Returns 0 on success, -2 if the ID2L is too big. */
static int mdbx_mid2l_append(MDBX_ID2L ids, MDBX_ID2 *id);
static int mdbx_mid2l_append(MDBX_ID2L ids, MDBX_ID2 *id) {
/* Too big? */
if (unlikely(ids[0].mid >= MDBX_IDL_UM_MAX))
return -2;
ids[0].mid++;
ids[ids[0].mid] = *id;
return 0;
}
/*----------------------------------------------------------------------------*/
@ -3885,20 +4139,6 @@ int __cold mdbx_env_close_ex(MDBX_env *env, int dont_sync) {
void __cold mdbx_env_close(MDBX_env *env) { mdbx_env_close_ex(env, 0); }
/* LY: fast enough on most arches
*
* /
* | -1, a < b
* cmp2int(a,b) = < 0, a == b
* | 1, a > b
* \
*/
#if 1
#define mdbx_cmp2int(a, b) (((b) > (a)) ? -1 : (a) > (b))
#else
#define mdbx_cmp2int(a, b) (((a) > (b)) - ((b) > (a)))
#endif
/* Compare two items pointing at aligned unsigned int's. */
static int __hot mdbx_cmp_int_ai(const MDBX_val *a, const MDBX_val *b) {
mdbx_assert(NULL, a->iov_len == b->iov_len);
@ -8951,275 +9191,6 @@ int __cold mdbx_reader_check0(MDBX_env *env, int rdt_locked, int *dead) {
return rc;
}
static unsigned __hot mdbx_midl_search(MDBX_IDL ids, pgno_t id) {
/* binary search of id in ids
* if found, returns position of id
* if not found, returns first position greater than id */
unsigned base = 0;
unsigned cursor = 1;
int val = 0;
unsigned n = ids[0];
while (n > 0) {
unsigned pivot = n >> 1;
cursor = base + pivot + 1;
val = mdbx_cmp2int(ids[cursor], id);
if (val < 0) {
n = pivot;
} else if (val > 0) {
base = cursor;
n -= pivot + 1;
} else {
return cursor;
}
}
if (val > 0)
++cursor;
return cursor;
}
static MDBX_IDL mdbx_midl_alloc(int num) {
MDBX_IDL ids = malloc((num + 2) * sizeof(pgno_t));
if (likely(ids)) {
*ids++ = num;
*ids = 0;
}
return ids;
}
static void mdbx_midl_free(MDBX_IDL ids) {
if (ids)
free(ids - 1);
}
static void mdbx_midl_shrink(MDBX_IDL *idp) {
MDBX_IDL ids = *idp - 1;
if (unlikely(*ids > MDBX_IDL_UM_MAX)) {
/* shrink to MDBX_IDL_UM_MAX */
ids = realloc(ids, (MDBX_IDL_UM_MAX + 2) * sizeof(pgno_t));
if (likely(ids)) {
*ids++ = MDBX_IDL_UM_MAX;
*idp = ids;
}
}
}
static int mdbx_midl_grow(MDBX_IDL *idp, int num) {
MDBX_IDL idn = *idp - 1;
/* grow it */
idn = realloc(idn, (*idn + num + 2) * sizeof(pgno_t));
if (unlikely(!idn))
return MDBX_ENOMEM;
*idn++ += num;
*idp = idn;
return 0;
}
static int mdbx_midl_need(MDBX_IDL *idp, unsigned num) {
MDBX_IDL ids = *idp;
num += ids[0];
if (num > ids[-1]) {
num = (num + num / 4 + (256 + 2)) & -256;
ids = realloc(ids - 1, num * sizeof(pgno_t));
if (unlikely(!ids))
return MDBX_ENOMEM;
*ids++ = num - 2;
*idp = ids;
}
return 0;
}
static int mdbx_midl_append(MDBX_IDL *idp, pgno_t id) {
MDBX_IDL ids = *idp;
/* Too big? */
if (ids[0] >= ids[-1]) {
if (mdbx_midl_grow(idp, MDBX_IDL_UM_MAX))
return MDBX_ENOMEM;
ids = *idp;
}
ids[0]++;
ids[ids[0]] = id;
return 0;
}
static int mdbx_midl_append_list(MDBX_IDL *idp, MDBX_IDL app) {
MDBX_IDL ids = *idp;
/* Too big? */
if (ids[0] + app[0] >= ids[-1]) {
if (mdbx_midl_grow(idp, app[0]))
return MDBX_ENOMEM;
ids = *idp;
}
memcpy(&ids[ids[0] + 1], &app[1], app[0] * sizeof(pgno_t));
ids[0] += app[0];
return 0;
}
static int mdbx_midl_append_range(MDBX_IDL *idp, pgno_t id, unsigned n) {
pgno_t *ids = *idp, len = ids[0];
/* Too big? */
if (len + n > ids[-1]) {
if (mdbx_midl_grow(idp, n | MDBX_IDL_UM_MAX))
return MDBX_ENOMEM;
ids = *idp;
}
ids[0] = len + n;
ids += len;
while (n)
ids[n--] = id++;
return 0;
}
static void __hot mdbx_midl_xmerge(MDBX_IDL idl, MDBX_IDL merge) {
pgno_t old_id, merge_id, i = merge[0], j = idl[0], k = i + j, total = k;
idl[0] = ~(pgno_t)0; /* delimiter for idl scan below */
old_id = idl[j];
while (i) {
merge_id = merge[i--];
for (; old_id < merge_id; old_id = idl[--j])
idl[k--] = old_id;
idl[k--] = merge_id;
}
idl[0] = total;
}
/* Quicksort + Insertion sort for small arrays */
#define SMALL 8
#define MIDL_SWAP(a, b) \
do { \
pgno_t tmp_pgno = (a); \
(a) = (b); \
(b) = tmp_pgno; \
} while (0)
static void __hot mdbx_midl_sort(MDBX_IDL ids) {
/* Max possible depth of int-indexed tree * 2 items/level */
int istack[sizeof(int) * CHAR_BIT * 2];
int i, j, k, l, ir, jstack;
pgno_t a;
ir = (int)ids[0];
l = 1;
jstack = 0;
for (;;) {
if (ir - l < SMALL) { /* Insertion sort */
for (j = l + 1; j <= ir; j++) {
a = ids[j];
for (i = j - 1; i >= 1; i--) {
if (ids[i] >= a)
break;
ids[i + 1] = ids[i];
}
ids[i + 1] = a;
}
if (jstack == 0)
break;
ir = istack[jstack--];
l = istack[jstack--];
} else {
k = (l + ir) >> 1; /* Choose median of left, center, right */
MIDL_SWAP(ids[k], ids[l + 1]);
if (ids[l] < ids[ir])
MIDL_SWAP(ids[l], ids[ir]);
if (ids[l + 1] < ids[ir])
MIDL_SWAP(ids[l + 1], ids[ir]);
if (ids[l] < ids[l + 1])
MIDL_SWAP(ids[l], ids[l + 1]);
i = l + 1;
j = ir;
a = ids[l + 1];
for (;;) {
do
i++;
while (ids[i] > a);
do
j--;
while (ids[j] < a);
if (j < i)
break;
MIDL_SWAP(ids[i], ids[j]);
}
ids[l + 1] = ids[j];
ids[j] = a;
jstack += 2;
if (ir - i + 1 >= j - l) {
istack[jstack] = ir;
istack[jstack - 1] = i;
ir = j - 1;
} else {
istack[jstack] = j - 1;
istack[jstack - 1] = l;
l = i;
}
}
}
}
static unsigned __hot mdbx_mid2l_search(MDBX_ID2L ids, pgno_t id) {
/* binary search of id in ids
* if found, returns position of id
* if not found, returns first position greater than id */
unsigned base = 0;
unsigned cursor = 1;
int val = 0;
unsigned n = (unsigned)ids[0].mid;
while (n > 0) {
unsigned pivot = n >> 1;
cursor = base + pivot + 1;
val = mdbx_cmp2int(id, ids[cursor].mid);
if (val < 0) {
n = pivot;
} else if (val > 0) {
base = cursor;
n -= pivot + 1;
} else {
return cursor;
}
}
if (val > 0)
++cursor;
return cursor;
}
static int mdbx_mid2l_insert(MDBX_ID2L ids, MDBX_ID2 *id) {
unsigned x = mdbx_mid2l_search(ids, id->mid);
if (unlikely(x < 1))
return /* internal error */ -2;
if (x <= ids[0].mid && ids[x].mid == id->mid)
return /* duplicate */ -1;
if (unlikely(ids[0].mid >= MDBX_IDL_UM_MAX))
return /* too big */ -2;
/* insert id */
ids[0].mid++;
for (unsigned i = (unsigned)ids[0].mid; i > x; i--)
ids[i] = ids[i - 1];
ids[x] = *id;
return 0;
}
static int mdbx_mid2l_append(MDBX_ID2L ids, MDBX_ID2 *id) {
/* Too big? */
if (unlikely(ids[0].mid >= MDBX_IDL_UM_MAX))
return -2;
ids[0].mid++;
ids[ids[0].mid] = *id;
return 0;
}
int __cold mdbx_setup_debug(int flags, MDBX_debug_func *logger, long edge_txn) {
unsigned ret = mdbx_runtime_flags;
if (flags != (int)MDBX_DBG_DNT)