1/* $NetBSD: rf_mcpair.c,v 1.24 2011/05/01 01:09:05 mrg Exp $ */
2/*
3 * Copyright (c) 1995 Carnegie-Mellon University.
4 * All rights reserved.
5 *
6 * Author: Jim Zelenka
7 *
8 * Permission to use, copy, modify and distribute this software and
9 * its documentation is hereby granted, provided that both the copyright
10 * notice and this permission notice appear in all copies of the
11 * software, derivative works or modified versions, and any portions
12 * thereof, and that both notices appear in supporting documentation.
13 *
14 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
15 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
16 * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
17 *
18 * Carnegie Mellon requests users of this software to return to
19 *
20 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
21 * School of Computer Science
22 * Carnegie Mellon University
23 * Pittsburgh PA 15213-3890
24 *
25 * any improvements or extensions that they make and grant Carnegie the
26 * rights to redistribute these changes.
27 */
28
29/* rf_mcpair.c
30 * an mcpair is a structure containing a mutex and a condition variable.
31 * it's used to block the current thread until some event occurs.
32 */
33
34#include <sys/cdefs.h>
35__KERNEL_RCSID(0, "$NetBSD: rf_mcpair.c,v 1.24 2011/05/01 01:09:05 mrg Exp $");
36
37#include <dev/raidframe/raidframevar.h>
38
39#include "rf_archs.h"
40#include "rf_threadstuff.h"
41#include "rf_mcpair.h"
42#include "rf_debugMem.h"
43#include "rf_general.h"
44#include "rf_shutdown.h"
45#include "rf_netbsd.h"
46
47#include <sys/pool.h>
48#include <sys/proc.h>
49
50#define RF_MAX_FREE_MCPAIR 128
51#define RF_MIN_FREE_MCPAIR 24
52
53static void rf_ShutdownMCPair(void *);
54
55static void
56rf_ShutdownMCPair(void *ignored)
57{
58 pool_destroy(&rf_pools.mcpair);
59}
60
61int
62rf_ConfigureMCPair(RF_ShutdownList_t **listp)
63{
64
65 rf_pool_init(&rf_pools.mcpair, sizeof(RF_MCPair_t),
66 "rf_mcpair_pl", RF_MIN_FREE_MCPAIR, RF_MAX_FREE_MCPAIR);
67 rf_ShutdownCreate(listp, rf_ShutdownMCPair, NULL);
68
69 return (0);
70}
71
72RF_MCPair_t *
73rf_AllocMCPair(void)
74{
75 RF_MCPair_t *t;
76
77 t = pool_get(&rf_pools.mcpair, PR_WAITOK);
78 rf_init_mutex2(t->mutex, IPL_VM);
79 rf_init_cond2(t->cond, "mcpair");
80 t->flag = 0;
81
82 return (t);
83}
84
85void
86rf_FreeMCPair(RF_MCPair_t *t)
87{
88 rf_destroy_cond2(t->cond);
89 rf_destroy_mutex2(t->mutex);
90 pool_put(&rf_pools.mcpair, t);
91}
92
93/* the callback function used to wake you up when you use an mcpair to
94 wait for something */
95void
96rf_MCPairWakeupFunc(RF_MCPair_t *mcpair)
97{
98 RF_LOCK_MCPAIR(mcpair);
99 mcpair->flag = 1;
100 rf_broadcast_cond2(mcpair->cond);
101 RF_UNLOCK_MCPAIR(mcpair);
102}
103