1 /* $NetBSD: rf_mcpair.c,v 1.7 2001/11/13 07:11:14 lukem 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 1.7 2001/11/13 07:11:14 lukem 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_freelist.h" 44 #include "rf_shutdown.h" 45 46 #include <sys/proc.h> 47 48 static RF_FreeList_t *rf_mcpair_freelist; 49 50 #define RF_MAX_FREE_MCPAIR 128 51 #define RF_MCPAIR_INC 16 52 #define RF_MCPAIR_INITIAL 24 53 54 static int init_mcpair(RF_MCPair_t *); 55 static void clean_mcpair(RF_MCPair_t *); 56 static void rf_ShutdownMCPair(void *); 57 58 59 60 static int 61 init_mcpair(t) 62 RF_MCPair_t *t; 63 { 64 int rc; 65 66 rc = rf_mutex_init(&t->mutex); 67 if (rc) { 68 RF_ERRORMSG3("Unable to init mutex file %s line %d rc=%d\n", __FILE__, 69 __LINE__, rc); 70 return (rc); 71 } 72 rc = rf_cond_init(&t->cond); 73 if (rc) { 74 RF_ERRORMSG3("Unable to init cond file %s line %d rc=%d\n", __FILE__, 75 __LINE__, rc); 76 rf_mutex_destroy(&t->mutex); 77 return (rc); 78 } 79 return (0); 80 } 81 82 static void 83 clean_mcpair(t) 84 RF_MCPair_t *t; 85 { 86 rf_mutex_destroy(&t->mutex); 87 rf_cond_destroy(&t->cond); 88 } 89 90 static void 91 rf_ShutdownMCPair(ignored) 92 void *ignored; 93 { 94 RF_FREELIST_DESTROY_CLEAN(rf_mcpair_freelist, next, (RF_MCPair_t *), clean_mcpair); 95 } 96 97 int 98 rf_ConfigureMCPair(listp) 99 RF_ShutdownList_t **listp; 100 { 101 int rc; 102 103 RF_FREELIST_CREATE(rf_mcpair_freelist, RF_MAX_FREE_MCPAIR, 104 RF_MCPAIR_INC, sizeof(RF_MCPair_t)); 105 rc = rf_ShutdownCreate(listp, rf_ShutdownMCPair, NULL); 106 if (rc) { 107 RF_ERRORMSG3("Unable to add to shutdown list file %s line %d rc=%d\n", 108 __FILE__, __LINE__, rc); 109 rf_ShutdownMCPair(NULL); 110 return (rc); 111 } 112 RF_FREELIST_PRIME_INIT(rf_mcpair_freelist, RF_MCPAIR_INITIAL, next, 113 (RF_MCPair_t *), init_mcpair); 114 return (0); 115 } 116 117 RF_MCPair_t * 118 rf_AllocMCPair() 119 { 120 RF_MCPair_t *t; 121 122 RF_FREELIST_GET_INIT(rf_mcpair_freelist, t, next, (RF_MCPair_t *), init_mcpair); 123 if (t) { 124 t->flag = 0; 125 t->next = NULL; 126 } 127 return (t); 128 } 129 130 void 131 rf_FreeMCPair(t) 132 RF_MCPair_t *t; 133 { 134 RF_FREELIST_FREE_CLEAN(rf_mcpair_freelist, t, next, clean_mcpair); 135 } 136 /* the callback function used to wake you up when you use an mcpair to wait for something */ 137 void 138 rf_MCPairWakeupFunc(mcpair) 139 RF_MCPair_t *mcpair; 140 { 141 RF_LOCK_MUTEX(mcpair->mutex); 142 mcpair->flag = 1; 143 wakeup(&(mcpair->cond)); 144 RF_UNLOCK_MUTEX(mcpair->mutex); 145 } 146