tcl_lock.c
上传用户:romrleung
上传日期:2022-05-23
资源大小:18897k
文件大小:17k
- /*-
- * See the file LICENSE for redistribution information.
- *
- * Copyright (c) 1999-2001
- * Sleepycat Software. All rights reserved.
- */
- #include "db_config.h"
- #ifndef lint
- static const char revid[] = "$Id: tcl_lock.c,v 11.47 2002/08/08 15:27:10 bostic Exp $";
- #endif /* not lint */
- #ifndef NO_SYSTEM_INCLUDES
- #include <sys/types.h>
- #include <stdlib.h>
- #include <string.h>
- #include <tcl.h>
- #endif
- #include "db_int.h"
- #include "dbinc/tcl_db.h"
- /*
- * Prototypes for procedures defined later in this file:
- */
- static int lock_Cmd __P((ClientData, Tcl_Interp *, int, Tcl_Obj * CONST*));
- static int _LockMode __P((Tcl_Interp *, Tcl_Obj *, db_lockmode_t *));
- static int _GetThisLock __P((Tcl_Interp *, DB_ENV *, u_int32_t,
- u_int32_t, DBT *, db_lockmode_t, char *));
- static void _LockPutInfo __P((Tcl_Interp *, db_lockop_t, DB_LOCK *,
- u_int32_t, DBT *));
- #if CONFIG_TEST
- static char *lkmode[] = {
- "ng",
- "read",
- "write",
- "iwrite",
- "iread",
- "iwr",
- NULL
- };
- enum lkmode {
- LK_NG,
- LK_READ,
- LK_WRITE,
- LK_IWRITE,
- LK_IREAD,
- LK_IWR
- };
- /*
- * tcl_LockDetect --
- *
- * PUBLIC: int tcl_LockDetect __P((Tcl_Interp *, int,
- * PUBLIC: Tcl_Obj * CONST*, DB_ENV *));
- */
- int
- tcl_LockDetect(interp, objc, objv, envp)
- Tcl_Interp *interp; /* Interpreter */
- int objc; /* How many arguments? */
- Tcl_Obj *CONST objv[]; /* The argument objects */
- DB_ENV *envp; /* Environment pointer */
- {
- static char *ldopts[] = {
- "expire",
- "default",
- "maxlocks",
- "minlocks",
- "minwrites",
- "oldest",
- "random",
- "youngest",
- NULL
- };
- enum ldopts {
- LD_EXPIRE,
- LD_DEFAULT,
- LD_MAXLOCKS,
- LD_MINLOCKS,
- LD_MINWRITES,
- LD_OLDEST,
- LD_RANDOM,
- LD_YOUNGEST
- };
- u_int32_t flag, policy;
- int i, optindex, result, ret;
- result = TCL_OK;
- flag = policy = 0;
- i = 2;
- while (i < objc) {
- if (Tcl_GetIndexFromObj(interp, objv[i],
- ldopts, "option", TCL_EXACT, &optindex) != TCL_OK)
- return (IS_HELP(objv[i]));
- i++;
- switch ((enum ldopts)optindex) {
- case LD_EXPIRE:
- FLAG_CHECK(policy);
- policy = DB_LOCK_EXPIRE;
- break;
- case LD_DEFAULT:
- FLAG_CHECK(policy);
- policy = DB_LOCK_DEFAULT;
- break;
- case LD_MAXLOCKS:
- FLAG_CHECK(policy);
- policy = DB_LOCK_MAXLOCKS;
- break;
- case LD_MINWRITES:
- FLAG_CHECK(policy);
- policy = DB_LOCK_MINWRITE;
- break;
- case LD_MINLOCKS:
- FLAG_CHECK(policy);
- policy = DB_LOCK_MINLOCKS;
- break;
- case LD_OLDEST:
- FLAG_CHECK(policy);
- policy = DB_LOCK_OLDEST;
- break;
- case LD_YOUNGEST:
- FLAG_CHECK(policy);
- policy = DB_LOCK_YOUNGEST;
- break;
- case LD_RANDOM:
- FLAG_CHECK(policy);
- policy = DB_LOCK_RANDOM;
- break;
- }
- }
- _debug_check();
- ret = envp->lock_detect(envp, flag, policy, NULL);
- result = _ReturnSetup(interp, ret, DB_RETOK_STD(ret), "lock detect");
- return (result);
- }
- /*
- * tcl_LockGet --
- *
- * PUBLIC: int tcl_LockGet __P((Tcl_Interp *, int,
- * PUBLIC: Tcl_Obj * CONST*, DB_ENV *));
- */
- int
- tcl_LockGet(interp, objc, objv, envp)
- Tcl_Interp *interp; /* Interpreter */
- int objc; /* How many arguments? */
- Tcl_Obj *CONST objv[]; /* The argument objects */
- DB_ENV *envp; /* Environment pointer */
- {
- static char *lgopts[] = {
- "-nowait",
- NULL
- };
- enum lgopts {
- LGNOWAIT
- };
- DBT obj;
- Tcl_Obj *res;
- void *otmp;
- db_lockmode_t mode;
- u_int32_t flag, lockid;
- int freeobj, optindex, result, ret;
- char newname[MSG_SIZE];
- result = TCL_OK;
- freeobj = 0;
- memset(newname, 0, MSG_SIZE);
- if (objc != 5 && objc != 6) {
- Tcl_WrongNumArgs(interp, 2, objv, "?-nowait? mode id obj");
- return (TCL_ERROR);
- }
- /*
- * Work back from required args.
- * Last arg is obj.
- * Second last is lock id.
- * Third last is lock mode.
- */
- memset(&obj, 0, sizeof(obj));
- if ((result =
- _GetUInt32(interp, objv[objc-2], &lockid)) != TCL_OK)
- return (result);
- ret = _CopyObjBytes(interp, objv[objc-1], &otmp,
- &obj.size, &freeobj);
- if (ret != 0) {
- result = _ReturnSetup(interp, ret,
- DB_RETOK_STD(ret), "lock get");
- return (result);
- }
- obj.data = otmp;
- if ((result = _LockMode(interp, objv[(objc - 3)], &mode)) != TCL_OK)
- goto out;
- /*
- * Any left over arg is the flag.
- */
- flag = 0;
- if (objc == 6) {
- if (Tcl_GetIndexFromObj(interp, objv[(objc - 4)],
- lgopts, "option", TCL_EXACT, &optindex) != TCL_OK)
- return (IS_HELP(objv[(objc - 4)]));
- switch ((enum lgopts)optindex) {
- case LGNOWAIT:
- flag |= DB_LOCK_NOWAIT;
- break;
- }
- }
- result = _GetThisLock(interp, envp, lockid, flag, &obj, mode, newname);
- if (result == TCL_OK) {
- res = Tcl_NewStringObj(newname, strlen(newname));
- Tcl_SetObjResult(interp, res);
- }
- out:
- if (freeobj)
- (void)__os_free(envp, otmp);
- return (result);
- }
- /*
- * tcl_LockStat --
- *
- * PUBLIC: int tcl_LockStat __P((Tcl_Interp *, int,
- * PUBLIC: Tcl_Obj * CONST*, DB_ENV *));
- */
- int
- tcl_LockStat(interp, objc, objv, envp)
- Tcl_Interp *interp; /* Interpreter */
- int objc; /* How many arguments? */
- Tcl_Obj *CONST objv[]; /* The argument objects */
- DB_ENV *envp; /* Environment pointer */
- {
- DB_LOCK_STAT *sp;
- Tcl_Obj *res;
- int result, ret;
- result = TCL_OK;
- /*
- * No args for this. Error if there are some.
- */
- if (objc != 2) {
- Tcl_WrongNumArgs(interp, 2, objv, NULL);
- return (TCL_ERROR);
- }
- _debug_check();
- ret = envp->lock_stat(envp, &sp, 0);
- result = _ReturnSetup(interp, ret, DB_RETOK_STD(ret), "lock stat");
- if (result == TCL_ERROR)
- return (result);
- /*
- * Have our stats, now construct the name value
- * list pairs and free up the memory.
- */
- res = Tcl_NewObj();
- /*
- * MAKE_STAT_LIST assumes 'res' and 'error' label.
- */
- MAKE_STAT_LIST("Region size", sp->st_regsize);
- MAKE_STAT_LIST("Last allocated locker ID", sp->st_id);
- MAKE_STAT_LIST("Current maximum unused locker ID", sp->st_cur_maxid);
- MAKE_STAT_LIST("Maximum locks", sp->st_maxlocks);
- MAKE_STAT_LIST("Maximum lockers", sp->st_maxlockers);
- MAKE_STAT_LIST("Maximum objects", sp->st_maxobjects);
- MAKE_STAT_LIST("Lock modes", sp->st_nmodes);
- MAKE_STAT_LIST("Current number of locks", sp->st_nlocks);
- MAKE_STAT_LIST("Maximum number of locks so far", sp->st_maxnlocks);
- MAKE_STAT_LIST("Current number of lockers", sp->st_nlockers);
- MAKE_STAT_LIST("Maximum number of lockers so far", sp->st_maxnlockers);
- MAKE_STAT_LIST("Current number of objects", sp->st_nobjects);
- MAKE_STAT_LIST("Maximum number of objects so far", sp->st_maxnobjects);
- MAKE_STAT_LIST("Number of conflicts", sp->st_nconflicts);
- MAKE_STAT_LIST("Lock requests", sp->st_nrequests);
- MAKE_STAT_LIST("Lock releases", sp->st_nreleases);
- MAKE_STAT_LIST("Lock requests that would have waited", sp->st_nnowaits);
- MAKE_STAT_LIST("Deadlocks detected", sp->st_ndeadlocks);
- MAKE_STAT_LIST("Number of region lock waits", sp->st_region_wait);
- MAKE_STAT_LIST("Number of region lock nowaits", sp->st_region_nowait);
- MAKE_STAT_LIST("Lock timeout value", sp->st_locktimeout);
- MAKE_STAT_LIST("Number of lock timeouts", sp->st_nlocktimeouts);
- MAKE_STAT_LIST("Transaction timeout value", sp->st_txntimeout);
- MAKE_STAT_LIST("Number of transaction timeouts", sp->st_ntxntimeouts);
- Tcl_SetObjResult(interp, res);
- error:
- free(sp);
- return (result);
- }
- /*
- * tcl_LockTimeout --
- *
- * PUBLIC: int tcl_LockTimeout __P((Tcl_Interp *, int,
- * PUBLIC: Tcl_Obj * CONST*, DB_ENV *));
- */
- int
- tcl_LockTimeout(interp, objc, objv, envp)
- Tcl_Interp *interp; /* Interpreter */
- int objc; /* How many arguments? */
- Tcl_Obj *CONST objv[]; /* The argument objects */
- DB_ENV *envp; /* Environment pointer */
- {
- long timeout;
- int result, ret;
- /*
- * One arg, the timeout.
- */
- if (objc != 3) {
- Tcl_WrongNumArgs(interp, 2, objv, "?timeout?");
- return (TCL_ERROR);
- }
- result = Tcl_GetLongFromObj(interp, objv[2], &timeout);
- if (result != TCL_OK)
- return (result);
- _debug_check();
- ret = envp->set_timeout(envp, (u_int32_t)timeout, DB_SET_LOCK_TIMEOUT);
- result = _ReturnSetup(interp, ret, DB_RETOK_STD(ret), "lock timeout");
- return (result);
- }
- /*
- * lock_Cmd --
- * Implements the "lock" widget.
- */
- static int
- lock_Cmd(clientData, interp, objc, objv)
- ClientData clientData; /* Lock handle */
- Tcl_Interp *interp; /* Interpreter */
- int objc; /* How many arguments? */
- Tcl_Obj *CONST objv[]; /* The argument objects */
- {
- static char *lkcmds[] = {
- "put",
- NULL
- };
- enum lkcmds {
- LKPUT
- };
- DB_ENV *env;
- DB_LOCK *lock;
- DBTCL_INFO *lkip;
- int cmdindex, result, ret;
- Tcl_ResetResult(interp);
- lock = (DB_LOCK *)clientData;
- lkip = _PtrToInfo((void *)lock);
- result = TCL_OK;
- if (lock == NULL) {
- Tcl_SetResult(interp, "NULL lock", TCL_STATIC);
- return (TCL_ERROR);
- }
- if (lkip == NULL) {
- Tcl_SetResult(interp, "NULL lock info pointer", TCL_STATIC);
- return (TCL_ERROR);
- }
- env = NAME_TO_ENV(lkip->i_parent->i_name);
- /*
- * No args for this. Error if there are some.
- */
- if (objc != 2) {
- Tcl_WrongNumArgs(interp, 2, objv, NULL);
- return (TCL_ERROR);
- }
- /*
- * Get the command name index from the object based on the dbcmds
- * defined above.
- */
- if (Tcl_GetIndexFromObj(interp,
- objv[1], lkcmds, "command", TCL_EXACT, &cmdindex) != TCL_OK)
- return (IS_HELP(objv[1]));
- switch ((enum lkcmds)cmdindex) {
- case LKPUT:
- _debug_check();
- ret = env->lock_put(env, lock);
- result = _ReturnSetup(interp, ret, DB_RETOK_STD(ret),
- "lock put");
- (void)Tcl_DeleteCommand(interp, lkip->i_name);
- _DeleteInfo(lkip);
- __os_free(env, lock);
- break;
- }
- return (result);
- }
- /*
- * tcl_LockVec --
- *
- * PUBLIC: int tcl_LockVec __P((Tcl_Interp *, int, Tcl_Obj * CONST*, DB_ENV *));
- */
- int
- tcl_LockVec(interp, objc, objv, envp)
- Tcl_Interp *interp; /* Interpreter */
- int objc; /* How many arguments? */
- Tcl_Obj *CONST objv[]; /* The argument objects */
- DB_ENV *envp; /* environment pointer */
- {
- static char *lvopts[] = {
- "-nowait",
- NULL
- };
- enum lvopts {
- LVNOWAIT
- };
- static char *lkops[] = {
- "get",
- "put",
- "put_all",
- "put_obj",
- "timeout",
- NULL
- };
- enum lkops {
- LKGET,
- LKPUT,
- LKPUTALL,
- LKPUTOBJ,
- LKTIMEOUT
- };
- DB_LOCK *lock;
- DB_LOCKREQ list;
- DBT obj;
- Tcl_Obj **myobjv, *res, *thisop;
- void *otmp;
- u_int32_t flag, lockid;
- int freeobj, i, myobjc, optindex, result, ret;
- char *lockname, msg[MSG_SIZE], newname[MSG_SIZE];
- result = TCL_OK;
- memset(newname, 0, MSG_SIZE);
- flag = 0;
- freeobj = 0;
- /*
- * If -nowait is given, it MUST be first arg.
- */
- if (Tcl_GetIndexFromObj(interp, objv[2],
- lvopts, "option", TCL_EXACT, &optindex) == TCL_OK) {
- switch ((enum lvopts)optindex) {
- case LVNOWAIT:
- flag |= DB_LOCK_NOWAIT;
- break;
- }
- i = 3;
- } else {
- if (IS_HELP(objv[2]) == TCL_OK)
- return (TCL_OK);
- Tcl_ResetResult(interp);
- i = 2;
- }
- /*
- * Our next arg MUST be the locker ID.
- */
- result = _GetUInt32(interp, objv[i++], &lockid);
- if (result != TCL_OK)
- return (result);
- /*
- * All other remaining args are operation tuples.
- * Go through sequentially to decode, execute and build
- * up list of return values.
- */
- res = Tcl_NewListObj(0, NULL);
- while (i < objc) {
- /*
- * Get the list of the tuple.
- */
- lock = NULL;
- result = Tcl_ListObjGetElements(interp, objv[i],
- &myobjc, &myobjv);
- if (result == TCL_OK)
- i++;
- else
- break;
- /*
- * First we will set up the list of requests.
- * We will make a "second pass" after we get back
- * the results from the lock_vec call to create
- * the return list.
- */
- if (Tcl_GetIndexFromObj(interp, myobjv[0],
- lkops, "option", TCL_EXACT, &optindex) != TCL_OK) {
- result = IS_HELP(myobjv[0]);
- goto error;
- }
- switch ((enum lkops)optindex) {
- case LKGET:
- if (myobjc != 3) {
- Tcl_WrongNumArgs(interp, 1, myobjv,
- "{get obj mode}");
- result = TCL_ERROR;
- goto error;
- }
- result = _LockMode(interp, myobjv[2], &list.mode);
- if (result != TCL_OK)
- goto error;
- ret = _CopyObjBytes(interp, myobjv[1], &otmp,
- &obj.size, &freeobj);
- if (ret != 0) {
- result = _ReturnSetup(interp, ret,
- DB_RETOK_STD(ret), "lock vec");
- return (result);
- }
- obj.data = otmp;
- ret = _GetThisLock(interp, envp, lockid, flag,
- &obj, list.mode, newname);
- if (ret != 0) {
- result = _ReturnSetup(interp, ret,
- DB_RETOK_STD(ret), "lock vec");
- thisop = Tcl_NewIntObj(ret);
- (void)Tcl_ListObjAppendElement(interp, res,
- thisop);
- goto error;
- }
- thisop = Tcl_NewStringObj(newname, strlen(newname));
- (void)Tcl_ListObjAppendElement(interp, res, thisop);
- if (freeobj) {
- (void)__os_free(envp, otmp);
- freeobj = 0;
- }
- continue;
- case LKPUT:
- if (myobjc != 2) {
- Tcl_WrongNumArgs(interp, 1, myobjv,
- "{put lock}");
- result = TCL_ERROR;
- goto error;
- }
- list.op = DB_LOCK_PUT;
- lockname = Tcl_GetStringFromObj(myobjv[1], NULL);
- lock = NAME_TO_LOCK(lockname);
- if (lock == NULL) {
- snprintf(msg, MSG_SIZE, "Invalid lock: %sn",
- lockname);
- Tcl_SetResult(interp, msg, TCL_VOLATILE);
- result = TCL_ERROR;
- goto error;
- }
- list.lock = *lock;
- break;
- case LKPUTALL:
- if (myobjc != 1) {
- Tcl_WrongNumArgs(interp, 1, myobjv,
- "{put_all}");
- result = TCL_ERROR;
- goto error;
- }
- list.op = DB_LOCK_PUT_ALL;
- break;
- case LKPUTOBJ:
- if (myobjc != 2) {
- Tcl_WrongNumArgs(interp, 1, myobjv,
- "{put_obj obj}");
- result = TCL_ERROR;
- goto error;
- }
- list.op = DB_LOCK_PUT_OBJ;
- ret = _CopyObjBytes(interp, myobjv[1], &otmp,
- &obj.size, &freeobj);
- if (ret != 0) {
- result = _ReturnSetup(interp, ret,
- DB_RETOK_STD(ret), "lock vec");
- return (result);
- }
- obj.data = otmp;
- list.obj = &obj;
- break;
- case LKTIMEOUT:
- list.op = DB_LOCK_TIMEOUT;
- break;
- }
- /*
- * We get here, we have set up our request, now call
- * lock_vec.
- */
- _debug_check();
- ret = envp->lock_vec(envp, lockid, flag, &list, 1, NULL);
- /*
- * Now deal with whether or not the operation succeeded.
- * Get's were done above, all these are only puts.
- */
- thisop = Tcl_NewIntObj(ret);
- result = Tcl_ListObjAppendElement(interp, res, thisop);
- if (ret != 0 && result == TCL_OK)
- result = _ReturnSetup(interp, ret,
- DB_RETOK_STD(ret), "lock put");
- if (freeobj) {
- (void)__os_free(envp, otmp);
- freeobj = 0;
- }
- /*
- * We did a put of some kind. Since we did that,
- * we have to delete the commands associated with
- * any of the locks we just put.
- */
- _LockPutInfo(interp, list.op, lock, lockid, &obj);
- }
- if (result == TCL_OK && res)
- Tcl_SetObjResult(interp, res);
- error:
- return (result);
- }
- static int
- _LockMode(interp, obj, mode)
- Tcl_Interp *interp;
- Tcl_Obj *obj;
- db_lockmode_t *mode;
- {
- int optindex;
- if (Tcl_GetIndexFromObj(interp, obj, lkmode, "option",
- TCL_EXACT, &optindex) != TCL_OK)
- return (IS_HELP(obj));
- switch ((enum lkmode)optindex) {
- case LK_NG:
- *mode = DB_LOCK_NG;
- break;
- case LK_READ:
- *mode = DB_LOCK_READ;
- break;
- case LK_WRITE:
- *mode = DB_LOCK_WRITE;
- break;
- case LK_IREAD:
- *mode = DB_LOCK_IREAD;
- break;
- case LK_IWRITE:
- *mode = DB_LOCK_IWRITE;
- break;
- case LK_IWR:
- *mode = DB_LOCK_IWR;
- break;
- }
- return (TCL_OK);
- }
- static void
- _LockPutInfo(interp, op, lock, lockid, objp)
- Tcl_Interp *interp;
- db_lockop_t op;
- DB_LOCK *lock;
- u_int32_t lockid;
- DBT *objp;
- {
- DBTCL_INFO *p, *nextp;
- int found;
- for (p = LIST_FIRST(&__db_infohead); p != NULL; p = nextp) {
- found = 0;
- nextp = LIST_NEXT(p, entries);
- if ((op == DB_LOCK_PUT && (p->i_lock == lock)) ||
- (op == DB_LOCK_PUT_ALL && p->i_locker == lockid) ||
- (op == DB_LOCK_PUT_OBJ && p->i_lockobj.data &&
- memcmp(p->i_lockobj.data, objp->data, objp->size) == 0))
- found = 1;
- if (found) {
- (void)Tcl_DeleteCommand(interp, p->i_name);
- __os_free(NULL, p->i_lock);
- _DeleteInfo(p);
- }
- }
- }
- static int
- _GetThisLock(interp, envp, lockid, flag, objp, mode, newname)
- Tcl_Interp *interp; /* Interpreter */
- DB_ENV *envp; /* Env handle */
- u_int32_t lockid; /* Locker ID */
- u_int32_t flag; /* Lock flag */
- DBT *objp; /* Object to lock */
- db_lockmode_t mode; /* Lock mode */
- char *newname; /* New command name */
- {
- DB_LOCK *lock;
- DBTCL_INFO *envip, *ip;
- int result, ret;
- result = TCL_OK;
- envip = _PtrToInfo((void *)envp);
- if (envip == NULL) {
- Tcl_SetResult(interp, "Could not find env infon", TCL_STATIC);
- return (TCL_ERROR);
- }
- snprintf(newname, MSG_SIZE, "%s.lock%d",
- envip->i_name, envip->i_envlockid);
- ip = _NewInfo(interp, NULL, newname, I_LOCK);
- if (ip == NULL) {
- Tcl_SetResult(interp, "Could not set up info",
- TCL_STATIC);
- return (TCL_ERROR);
- }
- ret = __os_malloc(envp, sizeof(DB_LOCK), &lock);
- if (ret != 0) {
- Tcl_SetResult(interp, db_strerror(ret), TCL_STATIC);
- return (TCL_ERROR);
- }
- _debug_check();
- ret = envp->lock_get(envp, lockid, flag, objp, mode, lock);
- result = _ReturnSetup(interp, ret, DB_RETOK_STD(ret), "lock get");
- if (result == TCL_ERROR) {
- __os_free(envp, lock);
- _DeleteInfo(ip);
- return (result);
- }
- /*
- * Success. Set up return. Set up new info
- * and command widget for this lock.
- */
- ret = __os_malloc(envp, objp->size, &ip->i_lockobj.data);
- if (ret != 0) {
- Tcl_SetResult(interp, "Could not duplicate obj",
- TCL_STATIC);
- (void)envp->lock_put(envp, lock);
- __os_free(envp, lock);
- _DeleteInfo(ip);
- result = TCL_ERROR;
- goto error;
- }
- memcpy(ip->i_lockobj.data, objp->data, objp->size);
- ip->i_lockobj.size = objp->size;
- envip->i_envlockid++;
- ip->i_parent = envip;
- ip->i_locker = lockid;
- _SetInfoData(ip, lock);
- Tcl_CreateObjCommand(interp, newname,
- (Tcl_ObjCmdProc *)lock_Cmd, (ClientData)lock, NULL);
- error:
- return (result);
- }
- #endif