private RC pager_wait_on_lock(VFSLOCK locktype)
{
// Check that this is either a no-op (because the requested lock is already held, or one of the transistions that the busy-handler
// may be invoked during, according to the comment above sqlite3PagerSetBusyhandler().
Debug.Assert((this.eLock >= locktype) || (this.eLock == VFSLOCK.NO && locktype == VFSLOCK.SHARED) || (this.eLock == VFSLOCK.RESERVED && locktype == VFSLOCK.EXCLUSIVE));
RC rc;
do
{
rc = pagerLockDb(locktype);
}while (rc == RC.BUSY && this.xBusyHandler(this.pBusyHandlerArg) != 0);
return(rc);
}
private RC pagerLockDb(VFSLOCK eLock)
{
var rc = RC.OK;
Debug.Assert(eLock == VFSLOCK.SHARED || eLock == VFSLOCK.RESERVED || eLock == VFSLOCK.EXCLUSIVE);
if (this.eLock < eLock || this.eLock == VFSLOCK.UNKNOWN)
{
rc = this.fd.Lock(eLock);
if (rc == RC.OK && (this.eLock != VFSLOCK.UNKNOWN || eLock == VFSLOCK.EXCLUSIVE))
{
this.eLock = eLock;
SysEx.IOTRACE("LOCK {0:x} {1}", this.GetHashCode(), eLock);
}
}
return rc;
}
private RC pagerLockDb(VFSLOCK eLock)
{
var rc = RC.OK;
Debug.Assert(eLock == VFSLOCK.SHARED || eLock == VFSLOCK.RESERVED || eLock == VFSLOCK.EXCLUSIVE);
if (this.eLock < eLock || this.eLock == VFSLOCK.UNKNOWN)
{
rc = this.fd.Lock(eLock);
if (rc == RC.OK && (this.eLock != VFSLOCK.UNKNOWN || eLock == VFSLOCK.EXCLUSIVE))
{
this.eLock = eLock;
SysEx.IOTRACE("LOCK {0:x} {1}", this.GetHashCode(), eLock);
}
}
return(rc);
}
private RC pagerUnlockDb(VFSLOCK eLock)
{
var rc = RC.OK;
Debug.Assert(!this.exclusiveMode || this.eLock == eLock);
Debug.Assert(eLock == VFSLOCK.NO || eLock == VFSLOCK.SHARED);
Debug.Assert(eLock != VFSLOCK.NO || !this.pagerUseWal());
if (this.fd.IsOpen)
{
Debug.Assert(this.eLock >= eLock);
rc = this.fd.Unlock(eLock);
if (this.eLock != VFSLOCK.UNKNOWN)
this.eLock = eLock;
SysEx.IOTRACE("UNLOCK {0:x} {1}", this.GetHashCode(), eLock);
}
return rc;
}
private RC pagerUnlockDb(VFSLOCK eLock)
{
var rc = RC.OK;
Debug.Assert(!this.exclusiveMode || this.eLock == eLock);
Debug.Assert(eLock == VFSLOCK.NO || eLock == VFSLOCK.SHARED);
Debug.Assert(eLock != VFSLOCK.NO || !this.pagerUseWal());
if (this.fd.IsOpen)
{
Debug.Assert(this.eLock >= eLock);
rc = this.fd.Unlock(eLock);
if (this.eLock != VFSLOCK.UNKNOWN)
{
this.eLock = eLock;
}
SysEx.IOTRACE("UNLOCK {0:x} {1}", this.GetHashCode(), eLock);
}
return(rc);
}
private RC pager_wait_on_lock(VFSLOCK locktype)
{
// Check that this is either a no-op (because the requested lock is already held, or one of the transistions that the busy-handler
// may be invoked during, according to the comment above sqlite3PagerSetBusyhandler().
Debug.Assert((this.eLock >= locktype) || (this.eLock == VFSLOCK.NO && locktype == VFSLOCK.SHARED) || (this.eLock == VFSLOCK.RESERVED && locktype == VFSLOCK.EXCLUSIVE));
RC rc;
do
rc = pagerLockDb(locktype);
while (rc == RC.BUSY && this.xBusyHandler(this.pBusyHandlerArg) != 0);
return rc;
}