1 /* $NetBSD: rf_mcpair.c,v 1.6 2001/10/04 15:58:54 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 <dev/raidframe/raidframevar.h> 35 36 #include "rf_archs.h" 37 #include "rf_threadstuff.h" 38 #include "rf_mcpair.h" 39 #include "rf_debugMem.h" 40 #include "rf_freelist.h" 41 #include "rf_shutdown.h" 42 43 #include <sys/proc.h> 44 45 static RF_FreeList_t *rf_mcpair_freelist; 46 47 #define RF_MAX_FREE_MCPAIR 128 48 #define RF_MCPAIR_INC 16 49 #define RF_MCPAIR_INITIAL 24 50 51 static int init_mcpair(RF_MCPair_t *); 52 static void clean_mcpair(RF_MCPair_t *); 53 static void rf_ShutdownMCPair(void *); 54 55 56 57 static int 58 init_mcpair(t) 59 RF_MCPair_t *t; 60 { 61 int rc; 62 63 rc = rf_mutex_init(&t->mutex); 64 if (rc) { 65 RF_ERRORMSG3("Unable to init mutex file %s line %d rc=%d\n", __FILE__, 66 __LINE__, rc); 67 return (rc); 68 } 69 rc = rf_cond_init(&t->cond); 70 if (rc) { 71 RF_ERRORMSG3("Unable to init cond file %s line %d rc=%d\n", __FILE__, 72 __LINE__, rc); 73 rf_mutex_destroy(&t->mutex); 74 return (rc); 75 } 76 return (0); 77 } 78 79 static void 80 clean_mcpair(t) 81 RF_MCPair_t *t; 82 { 83 rf_mutex_destroy(&t->mutex); 84 rf_cond_destroy(&t->cond); 85 } 86 87 static void 88 rf_ShutdownMCPair(ignored) 89 void *ignored; 90 { 91 RF_FREELIST_DESTROY_CLEAN(rf_mcpair_freelist, next, (RF_MCPair_t *), clean_mcpair); 92 } 93 94 int 95 rf_ConfigureMCPair(listp) 96 RF_ShutdownList_t **listp; 97 { 98 int rc; 99 100 RF_FREELIST_CREATE(rf_mcpair_freelist, RF_MAX_FREE_MCPAIR, 101 RF_MCPAIR_INC, sizeof(RF_MCPair_t)); 102 rc = rf_ShutdownCreate(listp, rf_ShutdownMCPair, NULL); 103 if (rc) { 104 RF_ERRORMSG3("Unable to add to shutdown list file %s line %d rc=%d\n", 105 __FILE__, __LINE__, rc); 106 rf_ShutdownMCPair(NULL); 107 return (rc); 108 } 109 RF_FREELIST_PRIME_INIT(rf_mcpair_freelist, RF_MCPAIR_INITIAL, next, 110 (RF_MCPair_t *), init_mcpair); 111 return (0); 112 } 113 114 RF_MCPair_t * 115 rf_AllocMCPair() 116 { 117 RF_MCPair_t *t; 118 119 RF_FREELIST_GET_INIT(rf_mcpair_freelist, t, next, (RF_MCPair_t *), init_mcpair); 120 if (t) { 121 t->flag = 0; 122 t->next = NULL; 123 } 124 return (t); 125 } 126 127 void 128 rf_FreeMCPair(t) 129 RF_MCPair_t *t; 130 { 131 RF_FREELIST_FREE_CLEAN(rf_mcpair_freelist, t, next, clean_mcpair); 132 } 133 /* the callback function used to wake you up when you use an mcpair to wait for something */ 134 void 135 rf_MCPairWakeupFunc(mcpair) 136 RF_MCPair_t *mcpair; 137 { 138 RF_LOCK_MUTEX(mcpair->mutex); 139 mcpair->flag = 1; 140 wakeup(&(mcpair->cond)); 141 RF_UNLOCK_MUTEX(mcpair->mutex); 142 } 143