1 /* $NetBSD: rf_mcpair.c,v 1.25 2021/07/23 00:54:45 oster 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 1.25 2021/07/23 00:54:45 oster 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 #include "rf_raid.h" 47 48 #include <sys/pool.h> 49 #include <sys/proc.h> 50 51 #define RF_MAX_FREE_MCPAIR 128 52 #define RF_MIN_FREE_MCPAIR 24 53 54 static void rf_ShutdownMCPair(void *); 55 56 static void 57 rf_ShutdownMCPair(void *arg) 58 { 59 RF_Raid_t *raidPtr; 60 61 raidPtr = (RF_Raid_t *) arg; 62 63 pool_destroy(&raidPtr->pools.mcpair); 64 } 65 66 int 67 rf_ConfigureMCPair(RF_ShutdownList_t **listp, RF_Raid_t *raidPtr, 68 RF_Config_t *cfgPtr) 69 { 70 71 rf_pool_init(raidPtr, raidPtr->poolNames.mcpair, &raidPtr->pools.mcpair, sizeof(RF_MCPair_t), 72 "mcpair", RF_MIN_FREE_MCPAIR, RF_MAX_FREE_MCPAIR); 73 rf_ShutdownCreate(listp, rf_ShutdownMCPair, raidPtr); 74 75 return (0); 76 } 77 78 RF_MCPair_t * 79 rf_AllocMCPair(RF_Raid_t *raidPtr) 80 { 81 RF_MCPair_t *t; 82 83 t = pool_get(&raidPtr->pools.mcpair, PR_WAITOK); 84 rf_init_mutex2(t->mutex, IPL_VM); 85 rf_init_cond2(t->cond, "mcpair"); 86 t->flag = 0; 87 88 return (t); 89 } 90 91 void 92 rf_FreeMCPair(RF_Raid_t *raidPtr, RF_MCPair_t *t) 93 { 94 rf_destroy_cond2(t->cond); 95 rf_destroy_mutex2(t->mutex); 96 pool_put(&raidPtr->pools.mcpair, t); 97 } 98 99 /* the callback function used to wake you up when you use an mcpair to 100 wait for something */ 101 void 102 rf_MCPairWakeupFunc(RF_MCPair_t *mcpair) 103 { 104 RF_LOCK_MCPAIR(mcpair); 105 mcpair->flag = 1; 106 rf_broadcast_cond2(mcpair->cond); 107 RF_UNLOCK_MCPAIR(mcpair); 108 } 109