/*      $NetBSD: rf_mcpair.c,v 1.25 2021/07/23 00:54:45 oster Exp $     */
/*
* Copyright (c) 1995 Carnegie-Mellon University.
* All rights reserved.
*
* Author: Jim Zelenka
*
* Permission to use, copy, modify and distribute this software and
* its documentation is hereby granted, provided that both the copyright
* notice and this permission notice appear in all copies of the
* software, derivative works or modified versions, and any portions
* thereof, and that both notices appear in supporting documentation.
*
* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
* CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
* FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
*
* Carnegie Mellon requests users of this software to return to
*
*  Software Distribution Coordinator  or  [email protected]
*  School of Computer Science
*  Carnegie Mellon University
*  Pittsburgh PA 15213-3890
*
* any improvements or extensions that they make and grant Carnegie the
* rights to redistribute these changes.
*/

/* rf_mcpair.c
* an mcpair is a structure containing a mutex and a condition variable.
* it's used to block the current thread until some event occurs.
*/

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: rf_mcpair.c,v 1.25 2021/07/23 00:54:45 oster Exp $");

#include <dev/raidframe/raidframevar.h>

#include "rf_archs.h"
#include "rf_threadstuff.h"
#include "rf_mcpair.h"
#include "rf_debugMem.h"
#include "rf_general.h"
#include "rf_shutdown.h"
#include "rf_netbsd.h"
#include "rf_raid.h"

#include <sys/pool.h>
#include <sys/proc.h>

#define RF_MAX_FREE_MCPAIR 128
#define RF_MIN_FREE_MCPAIR  24

static void rf_ShutdownMCPair(void *);

static void
rf_ShutdownMCPair(void *arg)
{
       RF_Raid_t *raidPtr;

       raidPtr = (RF_Raid_t *) arg;

       pool_destroy(&raidPtr->pools.mcpair);
}

int
rf_ConfigureMCPair(RF_ShutdownList_t **listp, RF_Raid_t *raidPtr,
                  RF_Config_t *cfgPtr)
{

       rf_pool_init(raidPtr, raidPtr->poolNames.mcpair, &raidPtr->pools.mcpair, sizeof(RF_MCPair_t),
                    "mcpair", RF_MIN_FREE_MCPAIR, RF_MAX_FREE_MCPAIR);
       rf_ShutdownCreate(listp, rf_ShutdownMCPair, raidPtr);

       return (0);
}

RF_MCPair_t *
rf_AllocMCPair(RF_Raid_t *raidPtr)
{
       RF_MCPair_t *t;

       t = pool_get(&raidPtr->pools.mcpair, PR_WAITOK);
       rf_init_mutex2(t->mutex, IPL_VM);
       rf_init_cond2(t->cond, "mcpair");
       t->flag = 0;

       return (t);
}

void
rf_FreeMCPair(RF_Raid_t *raidPtr, RF_MCPair_t *t)
{
       rf_destroy_cond2(t->cond);
       rf_destroy_mutex2(t->mutex);
       pool_put(&raidPtr->pools.mcpair, t);
}

/* the callback function used to wake you up when you use an mcpair to
  wait for something */
void
rf_MCPairWakeupFunc(RF_MCPair_t *mcpair)
{
       RF_LOCK_MCPAIR(mcpair);
       mcpair->flag = 1;
       rf_broadcast_cond2(mcpair->cond);
       RF_UNLOCK_MCPAIR(mcpair);
}