1 /* $NetBSD: rf_mcpair.c,v 1.22 2009/03/15 17:17:23 cegger 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 1.22 2009/03/15 17:17:23 cegger 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 simple_lock_init(&t->mutex); 79 t->cond = 0; 80 t->flag = 0; 81 82 return (t); 83 } 84 85 void 86 rf_FreeMCPair(RF_MCPair_t *t) 87 { 88 pool_put(&rf_pools.mcpair, t); 89 } 90 91 /* the callback function used to wake you up when you use an mcpair to 92 wait for something */ 93 void 94 rf_MCPairWakeupFunc(RF_MCPair_t *mcpair) 95 { 96 RF_LOCK_MUTEX(mcpair->mutex); 97 mcpair->flag = 1; 98 wakeup(&(mcpair->cond)); 99 RF_UNLOCK_MUTEX(mcpair->mutex); 100 } 101