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 | |
53 | static void rf_ShutdownMCPair(void *); |
54 | |
55 | static void |
56 | rf_ShutdownMCPair(void *ignored) |
57 | { |
58 | pool_destroy(&rf_pools.mcpair); |
59 | } |
60 | |
61 | int |
62 | rf_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 | |
72 | RF_MCPair_t * |
73 | rf_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 | |
85 | void |
86 | rf_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 */ |
95 | void |
96 | rf_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 | |