/*
*--------------------------------------------------------------
*
* OS_AsyncWrite --
*
* This initiates an asynchronous write on the "fake" file
* descriptor (which may be a file, socket, or named pipe).
* We also must save the ProcPtr and ClientData, so later
* when the io completes, we know who to call.
*
* We don't look at any results here (the WriteFile generally
* completes immediately) but do all completion processing
* in OS_DoIo when we get the io completion port done
* notifications. Then we call the callback.
*
* Results:
* -1 if error, 0 otherwise.
*
* Side effects:
* Asynchronous I/O operation is queued for completion.
*
*--------------------------------------------------------------
*/
int OS_AsyncWrite(int fd, int offset, void *buf, int len,
OS_AsyncProc procPtr, ClientData clientData)
{
int index = AIO_WR_IX(fd);
asyncIoInUse = TRUE;
if(fd > maxFd)
maxFd = fd;
while (index >= asyncIoTableSize) {
GrowAsyncTable();
}
ASSERT(asyncIoTable[index].inUse == 0);
asyncIoTable[index].procPtr = procPtr;
asyncIoTable[index].clientData = clientData;
asyncIoTable[index].fd = fd;
asyncIoTable[index].len = len;
asyncIoTable[index].offset = offset;
asyncIoTable[index].buf = buf;
asyncIoTable[index].inUse = 1;
FD_SET(fd, &writeFdSet);
return 0;
}
/*
*--------------------------------------------------------------
*
* OS_AsyncRead --
*
* This initiates an asynchronous read on the file
* handle which may be a socket or named pipe.
*
* We also must save the ProcPtr and ClientData, so later
* when the io completes, we know who to call.
*
* We don't look at any results here (the ReadFile may
* return data if it is cached) but do all completion
* processing in OS_Select when we get the io completion
* port done notifications. Then we call the callback.
*
* Results:
* -1 if error, 0 otherwise.
*
* Side effects:
* Asynchronous I/O operation is queued for completion.
*
*--------------------------------------------------------------
*/
int OS_AsyncRead(int fd, int offset, void *buf, int len,
OS_AsyncProc procPtr, ClientData clientData)
{
int index = AIO_RD_IX(fd);
ASSERT(asyncIoTable != NULL);
if(fd > maxFd)
maxFd = fd;
if(index >= asyncIoTableSize) {
GrowAsyncTable();
}
ASSERT(asyncIoTable[index].inUse == 0);
asyncIoTable[index].procPtr = procPtr;
asyncIoTable[index].clientData = clientData;
asyncIoTable[index].fd = fd;
asyncIoTable[index].len = len;
asyncIoTable[index].offset = offset;
asyncIoTable[index].buf = buf;
asyncIoTable[index].inUse = 1;
FD_SET(fd, &readFdSet);
return 0;
}
