rwlock_emul.c revision 255332
1/* $FreeBSD: head/contrib/ipfilter/lib/rwlock_emul.c 255332 2013-09-06 23:11:19Z cy $ */ 2 3/* 4 * Copyright (C) 2012 by Darren Reed. 5 * 6 * See the IPFILTER.LICENCE file for details on licencing. 7 * 8 * $Id$ 9 */ 10 11#include "ipf.h" 12 13#define EMM_MAGIC 0x97dd8b3a 14 15void eMrwlock_read_enter(rw, file, line) 16 eMrwlock_t *rw; 17 char *file; 18 int line; 19{ 20 if (rw->eMrw_magic != EMM_MAGIC) { 21 fprintf(stderr, "%s:eMrwlock_read_enter(%p): bad magic: %#x\n", 22 rw->eMrw_owner, rw, rw->eMrw_magic); 23 abort(); 24 } 25 if (rw->eMrw_read != 0 || rw->eMrw_write != 0) { 26 fprintf(stderr, 27 "%s:eMrwlock_read_enter(%p): already locked: %d/%d\n", 28 rw->eMrw_owner, rw, rw->eMrw_read, rw->eMrw_write); 29 abort(); 30 } 31 rw->eMrw_read++; 32 rw->eMrw_heldin = file; 33 rw->eMrw_heldat = line; 34} 35 36 37void eMrwlock_write_enter(rw, file, line) 38 eMrwlock_t *rw; 39 char *file; 40 int line; 41{ 42 if (rw->eMrw_magic != EMM_MAGIC) { 43 fprintf(stderr, "%s:eMrwlock_write_enter(%p): bad magic: %#x\n", 44 rw->eMrw_owner, rw, rw->eMrw_magic); 45 abort(); 46 } 47 if (rw->eMrw_read != 0 || rw->eMrw_write != 0) { 48 fprintf(stderr, 49 "%s:eMrwlock_write_enter(%p): already locked: %d/%d\n", 50 rw->eMrw_owner, rw, rw->eMrw_read, rw->eMrw_write); 51 abort(); 52 } 53 rw->eMrw_write++; 54 rw->eMrw_heldin = file; 55 rw->eMrw_heldat = line; 56} 57 58 59void eMrwlock_downgrade(rw, file, line) 60 eMrwlock_t *rw; 61 char *file; 62 int line; 63{ 64 if (rw->eMrw_magic != EMM_MAGIC) { 65 fprintf(stderr, "%s:eMrwlock_write_enter(%p): bad magic: %#x\n", 66 rw->eMrw_owner, rw, rw->eMrw_magic); 67 abort(); 68 } 69 if (rw->eMrw_read != 0 || rw->eMrw_write != 1) { 70 fprintf(stderr, 71 "%s:eMrwlock_write_enter(%p): already locked: %d/%d\n", 72 rw->eMrw_owner, rw, rw->eMrw_read, rw->eMrw_write); 73 abort(); 74 } 75 rw->eMrw_write--; 76 rw->eMrw_read++; 77 rw->eMrw_heldin = file; 78 rw->eMrw_heldat = line; 79} 80 81 82void eMrwlock_exit(rw) 83 eMrwlock_t *rw; 84{ 85 if (rw->eMrw_magic != EMM_MAGIC) { 86 fprintf(stderr, "%s:eMrwlock_exit(%p): bad magic: %#x\n", 87 rw->eMrw_owner, rw, rw->eMrw_magic); 88 abort(); 89 } 90 if (rw->eMrw_read != 1 && rw->eMrw_write != 1) { 91 fprintf(stderr, "%s:eMrwlock_exit(%p): not locked: %d/%d\n", 92 rw->eMrw_owner, rw, rw->eMrw_read, rw->eMrw_write); 93 abort(); 94 } 95 if (rw->eMrw_read == 1) 96 rw->eMrw_read--; 97 else if (rw->eMrw_write == 1) 98 rw->eMrw_write--; 99 rw->eMrw_heldin = NULL; 100 rw->eMrw_heldat = 0; 101} 102 103 104static int initcount = 0; 105 106void eMrwlock_init(rw, who) 107 eMrwlock_t *rw; 108 char *who; 109{ 110 if (rw->eMrw_magic == EMM_MAGIC) { /* safe bet ? */ 111 fprintf(stderr, 112 "%s:eMrwlock_init(%p): already initialised?: %#x\n", 113 rw->eMrw_owner, rw, rw->eMrw_magic); 114 abort(); 115 } 116 rw->eMrw_magic = EMM_MAGIC; 117 rw->eMrw_read = 0; 118 rw->eMrw_write = 0; 119 if (who != NULL) 120 rw->eMrw_owner = strdup(who); 121 else 122 rw->eMrw_owner = NULL; 123 initcount++; 124} 125 126 127void eMrwlock_destroy(rw) 128 eMrwlock_t *rw; 129{ 130 if (rw->eMrw_magic != EMM_MAGIC) { 131 fprintf(stderr, "%s:eMrwlock_destroy(%p): bad magic: %#x\n", 132 rw->eMrw_owner, rw, rw->eMrw_magic); 133 abort(); 134 } 135 if (rw->eMrw_owner != NULL) 136 free(rw->eMrw_owner); 137 memset(rw, 0xa5, sizeof(*rw)); 138 initcount--; 139} 140 141void ipf_rwlock_clean() 142{ 143 if (initcount != 0) 144 abort(); 145} 146