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ref

This commit is contained in:
Shengliang Guan 2022-02-28 14:18:13 +08:00
parent f680976d64
commit 7747ab2324
2 changed files with 85 additions and 99 deletions
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30
include/util/tref.h
View File

@ -14,8 +14,8 @@
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef _TD_UTIL_REF_H
#define _TD_UTIL_REF_H
#ifndef _TD_UTIL_REF_H_
#define _TD_UTIL_REF_H_
#include "os.h"
@ -25,45 +25,45 @@ extern "C" {
// open a reference set, max is the mod used by hash, fp is the pointer to free resource function
// return rsetId which will be used by other APIs. On error, -1 is returned, and terrno is set appropriately
int taosOpenRef(int max, void (*fp)(void *));
int32_t taosOpenRef(int32_t max, void (*fp)(void *));
// close the reference set, refId is the return value by taosOpenRef
// return 0 if success. On error, -1 is returned, and terrno is set appropriately
int taosCloseRef(int refId);
int32_t taosCloseRef(int32_t refId);
// add ref, p is the pointer to resource or pointer ID
// return Reference ID(rid) allocated. On error, -1 is returned, and terrno is set appropriately
int64_t taosAddRef(int refId, void *p);
int64_t taosAddRef(int32_t refId, void *p);
// remove ref, rid is the reference ID returned by taosAddRef
// return 0 if success. On error, -1 is returned, and terrno is set appropriately
int taosRemoveRef(int rsetId, int64_t rid);
int32_t taosRemoveRef(int32_t rsetId, int64_t rid);
// acquire ref, rid is the reference ID returned by taosAddRef
// return the resource p. On error, NULL is returned, and terrno is set appropriately
void *taosAcquireRef(int rsetId, int64_t rid);
void *taosAcquireRef(int32_t rsetId, int64_t rid);
// release ref, rid is the reference ID returned by taosAddRef
// return 0 if success. On error, -1 is returned, and terrno is set appropriately
int taosReleaseRef(int rsetId, int64_t rid);
int32_t taosReleaseRef(int32_t rsetId, int64_t rid);
// return the first reference if rid is 0, otherwise return the next after current reference.
// return the first reference if rid is 0, otherwise return the next after current reference.
// if return value is NULL, it means list is over(if terrno is set, it means error happens)
void *taosIterateRef(int rsetId, int64_t rid);
void *taosIterateRef(int32_t rsetId, int64_t rid);
// return the number of references in system
int taosListRef();
int32_t taosListRef();
#define RID_VALID(x) ((x) > 0)
/* sample code to iterate the refs
/* sample code to iterate the refs
void demoIterateRefs(int rsetId) {
void demoIterateRefs(int32_t rsetId) {
void *p = taosIterateRef(refId, 0);
while (p) {
// process P
// get the rid from p
p = taosIterateRef(rsetId, rid);
@ -76,4 +76,4 @@ void demoIterateRefs(int rsetId) {
}
#endif
#endif /*_TD_UTIL_REF_H*/
#endif /*_TD_UTIL_REF_H_*/

154
source/util/src/tref.c
View File

@ -13,8 +13,8 @@
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "os.h"
#define _DEFAULT_SOURCE
#include "tref.h"
#include "taoserror.h"
#include "tlog.h"
#include "tutil.h"
@ -25,49 +25,48 @@
#define TSDB_REF_STATE_DELETED 2
typedef struct SRefNode {
struct SRefNode *prev; // previous node
struct SRefNode *next; // next node
void *p; // pointer to resource protected,
int64_t rid; // reference ID
int32_t count; // number of references
int removed; // 1: removed
struct SRefNode *prev; // previous node
struct SRefNode *next; // next node
void *p; // pointer to resource protected,
int64_t rid; // reference ID
int32_t count; // number of references
int32_t removed; // 1: removed
} SRefNode;
typedef struct {
SRefNode **nodeList; // array of SRefNode linked list
int state; // 0: empty, 1: active; 2: deleted
int rsetId; // refSet ID, global unique
int64_t rid; // increase by one for each new reference
int max; // mod
int32_t count; // total number of SRefNodes in this set
SRefNode **nodeList; // array of SRefNode linked list
int32_t state; // 0: empty, 1: active; 2: deleted
int32_t rsetId; // refSet ID, global unique
int64_t rid; // increase by one for each new reference
int32_t max; // mod
int32_t count; // total number of SRefNodes in this set
int64_t *lockedBy;
void (*fp)(void *);
void (*fp)(void *);
} SRefSet;
static SRefSet tsRefSetList[TSDB_REF_OBJECTS];
static pthread_once_t tsRefModuleInit = PTHREAD_ONCE_INIT;
static pthread_mutex_t tsRefMutex;
static int tsRefSetNum = 0;
static int tsNextId = 0;
static int32_t tsRefSetNum = 0;
static int32_t tsNextId = 0;
static void taosInitRefModule(void);
static void taosLockList(int64_t *lockedBy);
static void taosUnlockList(int64_t *lockedBy);
static void taosIncRsetCount(SRefSet *pSet);
static void taosDecRsetCount(SRefSet *pSet);
static int taosDecRefCount(int rsetId, int64_t rid, int remove);
static void taosInitRefModule(void);
static void taosLockList(int64_t *lockedBy);
static void taosUnlockList(int64_t *lockedBy);
static void taosIncRsetCount(SRefSet *pSet);
static void taosDecRsetCount(SRefSet *pSet);
static int32_t taosDecRefCount(int32_t rsetId, int64_t rid, int32_t remove);
int taosOpenRef(int max, void (*fp)(void *))
{
int32_t taosOpenRef(int32_t max, void (*fp)(void *)) {
SRefNode **nodeList;
SRefSet *pSet;
int64_t *lockedBy;
int i, rsetId;
int32_t i, rsetId;
pthread_once(&tsRefModuleInit, taosInitRefModule);
nodeList = calloc(sizeof(SRefNode *), (size_t)max);
if (nodeList == NULL) {
if (nodeList == NULL) {
terrno = TSDB_CODE_REF_NO_MEMORY;
return -1;
}
@ -83,7 +82,7 @@ int taosOpenRef(int max, void (*fp)(void *))
for (i = 0; i < TSDB_REF_OBJECTS; ++i) {
tsNextId = (tsNextId + 1) % TSDB_REF_OBJECTS;
if (tsNextId == 0) tsNextId = 1; // dont use 0 as rsetId
if (tsNextId == 0) tsNextId = 1; // dont use 0 as rsetId
if (tsRefSetList[tsNextId].state == TSDB_REF_STATE_EMPTY) break;
}
@ -103,8 +102,8 @@ int taosOpenRef(int max, void (*fp)(void *))
uTrace("rsetId:%d is opened, max:%d, fp:%p refSetNum:%d", rsetId, max, fp, tsRefSetNum);
} else {
rsetId = TSDB_CODE_REF_FULL;
free (nodeList);
free (lockedBy);
free(nodeList);
free(lockedBy);
uTrace("run out of Ref ID, maximum:%d refSetNum:%d", TSDB_REF_OBJECTS, tsRefSetNum);
}
@ -113,10 +112,9 @@ int taosOpenRef(int max, void (*fp)(void *))
return rsetId;
}
int taosCloseRef(int rsetId)
{
SRefSet *pSet;
int deleted = 0;
int32_t taosCloseRef(int32_t rsetId) {
SRefSet *pSet;
int32_t deleted = 0;
if (rsetId < 0 || rsetId >= TSDB_REF_OBJECTS) {
uTrace("rsetId:%d is invalid, out of range", rsetId);
@ -143,9 +141,8 @@ int taosCloseRef(int rsetId)
return 0;
}
int64_t taosAddRef(int rsetId, void *p)
{
int hash;
int64_t taosAddRef(int32_t rsetId, void *p) {
int32_t hash;
SRefNode *pNode;
SRefSet *pSet;
int64_t rid = 0;
@ -173,7 +170,7 @@ int64_t taosAddRef(int rsetId, void *p)
rid = atomic_add_fetch_64(&pSet->rid, 1);
hash = rid % pSet->max;
taosLockList(pSet->lockedBy+hash);
taosLockList(pSet->lockedBy + hash);
pNode->p = p;
pNode->rid = rid;
@ -186,26 +183,22 @@ int64_t taosAddRef(int rsetId, void *p)
uTrace("rsetId:%d p:%p rid:%" PRId64 " is added, count:%d", rsetId, p, rid, pSet->count);
taosUnlockList(pSet->lockedBy+hash);
taosUnlockList(pSet->lockedBy + hash);
return rid;
}
int taosRemoveRef(int rsetId, int64_t rid)
{
return taosDecRefCount(rsetId, rid, 1);
}
int32_t taosRemoveRef(int32_t rsetId, int64_t rid) { return taosDecRefCount(rsetId, rid, 1); }
// if rid is 0, return the first p in hash list, otherwise, return the next after current rid
void *taosAcquireRef(int rsetId, int64_t rid)
{
int hash;
void *taosAcquireRef(int32_t rsetId, int64_t rid) {
int32_t hash;
SRefNode *pNode;
SRefSet *pSet;
void *p = NULL;
if (rsetId < 0 || rsetId >= TSDB_REF_OBJECTS) {
//uTrace("rsetId:%d rid:%" PRId64 " failed to acquire, rsetId not valid", rsetId, rid);
// uTrace("rsetId:%d rid:%" PRId64 " failed to acquire, rsetId not valid", rsetId, rid);
terrno = TSDB_CODE_REF_INVALID_ID;
return NULL;
}
@ -226,7 +219,7 @@ void *taosAcquireRef(int rsetId, int64_t rid)
}
hash = rid % pSet->max;
taosLockList(pSet->lockedBy+hash);
taosLockList(pSet->lockedBy + hash);
pNode = pSet->nodeList[hash];
@ -252,20 +245,17 @@ void *taosAcquireRef(int rsetId, int64_t rid)
uTrace("rsetId:%d rid:%" PRId64 " is not there, failed to acquire", rsetId, rid);
}
taosUnlockList(pSet->lockedBy+hash);
taosUnlockList(pSet->lockedBy + hash);
taosDecRsetCount(pSet);
return p;
}
int taosReleaseRef(int rsetId, int64_t rid)
{
return taosDecRefCount(rsetId, rid, 0);
}
int32_t taosReleaseRef(int32_t rsetId, int64_t rid) { return taosDecRefCount(rsetId, rid, 0); }
// if rid is 0, return the first p in hash list, otherwise, return the next after current rid
void *taosIterateRef(int rsetId, int64_t rid) {
void *taosIterateRef(int32_t rsetId, int64_t rid) {
SRefNode *pNode = NULL;
SRefSet *pSet;
@ -293,10 +283,10 @@ void *taosIterateRef(int rsetId, int64_t rid) {
do {
newP = NULL;
int hash = 0;
int32_t hash = 0;
if (rid > 0) {
hash = rid % pSet->max;
taosLockList(pSet->lockedBy+hash);
taosLockList(pSet->lockedBy + hash);
pNode = pSet->nodeList[hash];
while (pNode) {
@ -307,7 +297,7 @@ void *taosIterateRef(int rsetId, int64_t rid) {
if (pNode == NULL) {
uError("rsetId:%d rid:%" PRId64 " not there, quit", rsetId, rid);
terrno = TSDB_CODE_REF_NOT_EXIST;
taosUnlockList(pSet->lockedBy+hash);
taosUnlockList(pSet->lockedBy + hash);
taosDecRsetCount(pSet);
return NULL;
}
@ -320,14 +310,14 @@ void *taosIterateRef(int rsetId, int64_t rid) {
pNode = pNode->next;
}
if (pNode == NULL) {
taosUnlockList(pSet->lockedBy+hash);
taosUnlockList(pSet->lockedBy + hash);
hash++;
}
}
if (pNode == NULL) {
for (; hash < pSet->max; ++hash) {
taosLockList(pSet->lockedBy+hash);
taosLockList(pSet->lockedBy + hash);
pNode = pSet->nodeList[hash];
if (pNode) {
// check first place
@ -337,14 +327,14 @@ void *taosIterateRef(int rsetId, int64_t rid) {
}
if (pNode) break;
}
taosUnlockList(pSet->lockedBy+hash);
taosUnlockList(pSet->lockedBy + hash);
}
}
if (pNode) {
pNode->count++; // acquire it
newP = pNode->p;
taosUnlockList(pSet->lockedBy+hash);
taosUnlockList(pSet->lockedBy + hash);
uTrace("rsetId:%d p:%p rid:%" PRId64 " is returned", rsetId, newP, rid);
} else {
uTrace("rsetId:%d the list is over", rsetId);
@ -359,22 +349,21 @@ void *taosIterateRef(int rsetId, int64_t rid) {
return newP;
}
int taosListRef() {
int32_t taosListRef() {
SRefSet *pSet;
SRefNode *pNode;
int num = 0;
int32_t num = 0;
pthread_mutex_lock(&tsRefMutex);
for (int i = 0; i < TSDB_REF_OBJECTS; ++i) {
for (int32_t i = 0; i < TSDB_REF_OBJECTS; ++i) {
pSet = tsRefSetList + i;
if (pSet->state == TSDB_REF_STATE_EMPTY)
continue;
if (pSet->state == TSDB_REF_STATE_EMPTY) continue;
uInfo("rsetId:%d state:%d count::%d", i, pSet->state, pSet->count);
for (int j=0; j < pSet->max; ++j) {
for (int32_t j = 0; j < pSet->max; ++j) {
pNode = pSet->nodeList[j];
while (pNode) {
@ -390,12 +379,12 @@ int taosListRef() {
return num;
}
static int taosDecRefCount(int rsetId, int64_t rid, int remove) {
int hash;
static int32_t taosDecRefCount(int32_t rsetId, int64_t rid, int32_t remove) {
int32_t hash;
SRefSet *pSet;
SRefNode *pNode;
int released = 0;
int code = 0;
int32_t released = 0;
int32_t code = 0;
if (rsetId < 0 || rsetId >= TSDB_REF_OBJECTS) {
uTrace("rsetId:%d rid:%" PRId64 " failed to remove, rsetId not valid", rsetId, rid);
@ -417,12 +406,11 @@ static int taosDecRefCount(int rsetId, int64_t rid, int remove) {
}
hash = rid % pSet->max;
taosLockList(pSet->lockedBy+hash);
taosLockList(pSet->lockedBy + hash);
pNode = pSet->nodeList[hash];
while (pNode) {
if (pNode->rid == rid)
break;
if (pNode->rid == rid) break;
pNode = pNode->next;
}
@ -437,13 +425,13 @@ static int taosDecRefCount(int rsetId, int64_t rid, int remove) {
} else {
pSet->nodeList[hash] = pNode->next;
}
if (pNode->next) {
pNode->next->prev = pNode->prev;
}
released = 1;
} else {
uTrace("rsetId:%d p:%p rid:%" PRId64 " is released", rsetId, pNode->p, rid);
uTrace("rsetId:%d p:%p rid:%" PRId64 " is released", rsetId, pNode->p, rid);
}
} else {
uTrace("rsetId:%d rid:%" PRId64 " is not there, failed to release/remove", rsetId, rid);
@ -451,10 +439,11 @@ static int taosDecRefCount(int rsetId, int64_t rid, int remove) {
code = -1;
}
taosUnlockList(pSet->lockedBy+hash);
taosUnlockList(pSet->lockedBy + hash);
if (released) {
uTrace("rsetId:%d p:%p rid:%" PRId64 " is removed, count:%d, free mem: %p", rsetId, pNode->p, rid, pSet->count, pNode);
uTrace("rsetId:%d p:%p rid:%" PRId64 " is removed, count:%d, free mem: %p", rsetId, pNode->p, rid, pSet->count,
pNode);
(*pSet->fp)(pNode->p);
free(pNode);
@ -466,7 +455,7 @@ static int taosDecRefCount(int rsetId, int64_t rid, int remove) {
static void taosLockList(int64_t *lockedBy) {
int64_t tid = taosGetSelfPthreadId();
int i = 0;
int32_t i = 0;
while (atomic_val_compare_exchange_64(lockedBy, 0, tid) != 0) {
if (++i % 100 == 0) {
sched_yield();
@ -481,9 +470,7 @@ static void taosUnlockList(int64_t *lockedBy) {
}
}
static void taosInitRefModule(void) {
pthread_mutex_init(&tsRefMutex, NULL);
}
static void taosInitRefModule(void) { pthread_mutex_init(&tsRefMutex, NULL); }
static void taosIncRsetCount(SRefSet *pSet) {
atomic_add_fetch_32(&pSet->count, 1);
@ -512,4 +499,3 @@ static void taosDecRsetCount(SRefSet *pSet) {
pthread_mutex_unlock(&tsRefMutex);
}