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Remove nRef and vfsMutex from the sqlite3_vfs structure. Omit the

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sqlite3_vfs_release() interface.  Less memory allocated for a pager
in the common case where the size of the pathname is less than MAX_PATH. (CVS 4287)

FossilOrigin-Name: b8451da378179d43f25d9a014480c0f13dd1dc37
This commit is contained in:
drh
2007-08-24 16:08:29 +00:00
parent 9663b8f92d
commit 1cc8c448b5
11 changed files with 108 additions and 139 deletions
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24
src/os.c
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@@ -199,34 +199,10 @@ sqlite3_vfs *sqlite3_vfs_find(const char *zVfs){
if( zVfs==0 ) break;
if( strcmp(zVfs, pVfs->zName)==0 ) break;
}
if( pVfs ){
pVfs->nRef++;
assert( pVfs->nRef==1 || pVfs->vfsMutex!=0 );
assert( pVfs->nRef>1 || pVfs->vfsMutex==0 );
if( pVfs->vfsMutex==0 ){
pVfs->vfsMutex = sqlite3_mutex_alloc(SQLITE_MUTEX_FAST);
}
}
sqlite3_mutex_leave(mutex);
return pVfs;
}
/*
** Release a VFS once it is no longer needed.
*/
int sqlite3_vfs_release(sqlite3_vfs *pVfs){
sqlite3_mutex *mutex = sqlite3_mutex_alloc(SQLITE_MUTEX_STATIC_MASTER);
sqlite3_mutex_enter(mutex);
assert( pVfs->nRef>0 );
pVfs->nRef--;
if( pVfs->nRef==0 && pVfs->vfsMutex ){
sqlite3_mutex_free(pVfs->vfsMutex);
pVfs->vfsMutex = 0;
}
sqlite3_mutex_leave(mutex);
return SQLITE_OK;
}
/*
** Unlink a VFS from the linked list
*/