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/* This file contains the singlethreaded device driver interface.
*
* Changes:
* Aug 27, 2011 extracted from driver.c (A. Welzel)
*
* The entry points into this file are:
* blockdriver_task: the main message loop of the driver
* blockdriver_terminate: break out of the main message loop
* blockdriver_receive_mq: message receive interface with message queueing
* blockdriver_mq_queue: queue an incoming message for later processing
*/
#include <minix/drivers.h>
#include <minix/blockdriver.h>
#include "const.h"
#include "driver.h"
#include "mq.h"
static int running;
/*===========================================================================*
* blockdriver_receive_mq *
*===========================================================================*/
int blockdriver_receive_mq(message *m_ptr, int *status_ptr)
{
/* receive() interface for drivers with message queueing. */
/* Any queued messages? */
if (mq_dequeue(SINGLE_THREAD, m_ptr, status_ptr))
return OK;
/* Fall back to standard receive() interface otherwise. */
return driver_receive(ANY, m_ptr, status_ptr);
}
/*===========================================================================*
* blockdriver_terminate *
*===========================================================================*/
void blockdriver_terminate(void)
{
/* Break out of the main driver loop after finishing the current request. */
running = FALSE;
sef_cancel();
}
/*===========================================================================*
* blockdriver_task *
*===========================================================================*/
void blockdriver_task(struct blockdriver *bdp)
{
/* Main program of any block device driver task. */
int r, ipc_status;
message mess;
running = TRUE;
/* Here is the main loop of the disk task. It waits for a message, carries
* it out, and sends a reply.
*/
while (running) {
if ((r = blockdriver_receive_mq(&mess, &ipc_status)) != OK) {
if (r == EINTR && !running)
break;
panic("blockdriver_receive_mq failed: %d", r);
}
blockdriver_process(bdp, &mess, ipc_status);
}
}
/*===========================================================================*
* blockdriver_process *
*===========================================================================*/
void blockdriver_process(struct blockdriver *bdp, message *m_ptr,
int ipc_status)
{
/* Handle the given received message. */
blockdriver_process_on_thread(bdp, m_ptr, ipc_status, SINGLE_THREAD);
}
/*===========================================================================*
* blockdriver_mq_queue *
*===========================================================================*/
int blockdriver_mq_queue(message *m, int status)
{
/* Queue a message for later processing. */
return mq_enqueue(SINGLE_THREAD, m, status);
}
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