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Overview
| Comment: | Add the SQLITE_BUSY_RESERVED_LOCK compile-time option. (CVS 1894) |
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| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA1: | 25fe7a42ec2e06e659d7a0a6664789114c007e17 |
| User & Date: | drh 2004-08-19 13:29:15 |
Context
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2004-08-19
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| 15:12 | Enhance lemon so that a @X instead of just X in the code expands to the major token value rather than the minor token value. Use this to make the parser a few hundred bytes smaller. (CVS 1895) check-in: 28215096 user: drh tags: trunk | |
| 13:29 | Add the SQLITE_BUSY_RESERVED_LOCK compile-time option. (CVS 1894) check-in: 25fe7a42 user: drh tags: trunk | |
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2004-08-18
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| 19:09 | Make sure the database file is correctly truncated after a ROLLBACK that occurs after a statement abort. (CVS 1893) check-in: 6afe467d user: drh tags: trunk | |
Changes
Changes to src/pager.c.
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** The pager is used to access a database disk file. It implements ** atomic commit and rollback through the use of a journal file that ** is separate from the database file. The pager also implements file ** locking to prevent two processes from writing the same database ** file simultaneously, or one process from reading the database while ** another is writing. ** ** @(#) $Id: pager.c,v 1.158 2004/08/18 19:09:44 drh Exp $ */ #include "os.h" /* Must be first to enable large file support */ #include "sqliteInt.h" #include "pager.h" #include <assert.h> #include <string.h> ................................................................................ assert( pPager->state!=PAGER_UNLOCK ); if( pPager->state==PAGER_SHARED ){ assert( pPager->aInJournal==0 ); if( pPager->memDb ){ pPager->state = PAGER_EXCLUSIVE; pPager->origDbSize = pPager->dbSize; }else{ #if 0 int busy = 1; do { rc = sqlite3OsLock(&pPager->fd, RESERVED_LOCK); }while( rc==SQLITE_BUSY && pPager->pBusyHandler && pPager->pBusyHandler->xFunc && pPager->pBusyHandler->xFunc(pPager->pBusyHandler->pArg, busy++) ); #endif rc = sqlite3OsLock(&pPager->fd, RESERVED_LOCK); if( rc!=SQLITE_OK ){ /* We do not call the busy handler when we fail to get a reserved lock. ** The only reason we might fail is because another process is holding ** the reserved lock. But the other process will not be able to ** release its reserved lock until this process releases its shared ** lock. So we might as well fail in this process, let it release ** its shared lock so that the other process can commit. |
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** The pager is used to access a database disk file. It implements ** atomic commit and rollback through the use of a journal file that ** is separate from the database file. The pager also implements file ** locking to prevent two processes from writing the same database ** file simultaneously, or one process from reading the database while ** another is writing. ** ** @(#) $Id: pager.c,v 1.159 2004/08/19 13:29:15 drh Exp $ */ #include "os.h" /* Must be first to enable large file support */ #include "sqliteInt.h" #include "pager.h" #include <assert.h> #include <string.h> ................................................................................ assert( pPager->state!=PAGER_UNLOCK ); if( pPager->state==PAGER_SHARED ){ assert( pPager->aInJournal==0 ); if( pPager->memDb ){ pPager->state = PAGER_EXCLUSIVE; pPager->origDbSize = pPager->dbSize; }else{ #ifdef SQLITE_BUSY_RESERVED_LOCK int busy = 1; do { rc = sqlite3OsLock(&pPager->fd, RESERVED_LOCK); }while( rc==SQLITE_BUSY && pPager->pBusyHandler && pPager->pBusyHandler->xFunc && pPager->pBusyHandler->xFunc(pPager->pBusyHandler->pArg, busy++) ); #else rc = sqlite3OsLock(&pPager->fd, RESERVED_LOCK); #endif if( rc!=SQLITE_OK ){ /* We do not call the busy handler when we fail to get a reserved lock. ** The only reason we might fail is because another process is holding ** the reserved lock. But the other process will not be able to ** release its reserved lock until this process releases its shared ** lock. So we might as well fail in this process, let it release ** its shared lock so that the other process can commit. |