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Attempt to detect when two or more threads try to use the same database at

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the same time and return an SQLITE_MISUSE error.  Also return this error
if an attempt is made to use a closed database. (CVS 558)

FossilOrigin-Name: a05fabd2df1cb38c555a7b2f31b0ca687db500c2
This commit is contained in:
drh
2002-05-10 05:44:55 +00:00
parent d5feede1ff
commit 247be43d60
9 changed files with 119 additions and 22 deletions
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15
src/sqliteInt.h
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@@ -11,7 +11,7 @@
*************************************************************************
** Internal interface definitions for SQLite.
**
** @(#) $Id: sqliteInt.h,v 1.105 2002/04/12 10:08:59 drh Exp $
** @(#) $Id: sqliteInt.h,v 1.106 2002/05/10 05:44:56 drh Exp $
*/
#include "sqlite.h"
#include "hash.h"
@@ -167,6 +167,7 @@ struct sqlite {
int lastRowid; /* ROWID of most recent insert */
int priorNewRowid; /* Last randomly generated ROWID */
int onError; /* Default conflict algorithm */
int magic; /* Magic number for detect library misuse */
int nChange; /* Number of rows changed */
int recursionDepth; /* Number of nested calls to sqlite_exec() */
};
@@ -189,6 +190,16 @@ struct sqlite {
#define SQLITE_UnresetViews 0x00000200 /* True if one or more views have */
/* defined column names */
/*
** Possible values for the sqlite.magic field.
** The numbers are obtained at random and have no special meaning, other
** than being distinct from one another.
*/
#define SQLITE_MAGIC_OPEN 0xa029a697 /* Database is open */
#define SQLITE_MAGIC_CLOSED 0x9f3c2d33 /* Database is closed */
#define SQLITE_MAGIC_BUSY 0xf03b7906 /* Database currently in use */
#define SQLITE_MAGIC_ERROR 0xb5357930 /* An SQLITE_MISUSE error occurred */
/*
** Each SQL function is defined by an instance of the following
** structure. A pointer to this structure is stored in the sqlite.aFunc
@@ -648,3 +659,5 @@ IdList *sqliteIdListDup(IdList*);
Select *sqliteSelectDup(Select*);
FuncDef *sqliteFindFunction(sqlite*,const char*,int,int,int);
void sqliteRegisterBuildinFunctions(sqlite*);
int sqliteSafetyOn(sqlite*);
int sqliteSafetyOff(sqlite*);