101 lines
2.5 KiB
C
101 lines
2.5 KiB
C
/* $NetBSD: rf_mcpair.c,v 1.22 2009/03/15 17:17:23 cegger Exp $ */
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/*
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* Copyright (c) 1995 Carnegie-Mellon University.
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* All rights reserved.
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*
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* Author: Jim Zelenka
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*
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* Permission to use, copy, modify and distribute this software and
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* its documentation is hereby granted, provided that both the copyright
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* notice and this permission notice appear in all copies of the
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* software, derivative works or modified versions, and any portions
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* thereof, and that both notices appear in supporting documentation.
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*
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* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
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* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
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* FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
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*
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* Carnegie Mellon requests users of this software to return to
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*
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* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
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* School of Computer Science
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* Carnegie Mellon University
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* Pittsburgh PA 15213-3890
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*
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* any improvements or extensions that they make and grant Carnegie the
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* rights to redistribute these changes.
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*/
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/* rf_mcpair.c
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* an mcpair is a structure containing a mutex and a condition variable.
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* it's used to block the current thread until some event occurs.
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: rf_mcpair.c,v 1.22 2009/03/15 17:17:23 cegger Exp $");
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#include <dev/raidframe/raidframevar.h>
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#include "rf_archs.h"
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#include "rf_threadstuff.h"
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#include "rf_mcpair.h"
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#include "rf_debugMem.h"
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#include "rf_general.h"
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#include "rf_shutdown.h"
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#include "rf_netbsd.h"
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#include <sys/pool.h>
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#include <sys/proc.h>
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#define RF_MAX_FREE_MCPAIR 128
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#define RF_MIN_FREE_MCPAIR 24
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static void rf_ShutdownMCPair(void *);
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static void
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rf_ShutdownMCPair(void *ignored)
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{
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pool_destroy(&rf_pools.mcpair);
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}
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int
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rf_ConfigureMCPair(RF_ShutdownList_t **listp)
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{
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rf_pool_init(&rf_pools.mcpair, sizeof(RF_MCPair_t),
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"rf_mcpair_pl", RF_MIN_FREE_MCPAIR, RF_MAX_FREE_MCPAIR);
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rf_ShutdownCreate(listp, rf_ShutdownMCPair, NULL);
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return (0);
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}
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RF_MCPair_t *
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rf_AllocMCPair(void)
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{
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RF_MCPair_t *t;
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t = pool_get(&rf_pools.mcpair, PR_WAITOK);
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simple_lock_init(&t->mutex);
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t->cond = 0;
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t->flag = 0;
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return (t);
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}
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void
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rf_FreeMCPair(RF_MCPair_t *t)
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{
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pool_put(&rf_pools.mcpair, t);
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}
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/* the callback function used to wake you up when you use an mcpair to
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wait for something */
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void
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rf_MCPairWakeupFunc(RF_MCPair_t *mcpair)
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{
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RF_LOCK_MUTEX(mcpair->mutex);
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mcpair->flag = 1;
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wakeup(&(mcpair->cond));
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RF_UNLOCK_MUTEX(mcpair->mutex);
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}
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