| 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 | |