134 lines
2.9 KiB
C
134 lines
2.9 KiB
C
/* $NetBSD: rwlock_emul.c,v 1.1.1.3 2010/04/17 20:45:56 darrenr Exp $ */
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/*
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* Copyright (C) 2003 by Darren Reed.
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*
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* See the IPFILTER.LICENCE file for details on licencing.
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*
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* Id: rwlock_emul.c,v 1.1.4.2 2009/12/27 06:58:07 darrenr Exp
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*/
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#include "ipf.h"
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#define EMM_MAGIC 0x97dd8b3a
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void eMrwlock_read_enter(rw, file, line)
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eMrwlock_t *rw;
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char *file;
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int line;
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{
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if (rw->eMrw_magic != EMM_MAGIC) {
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fprintf(stderr, "%s:eMrwlock_read_enter(%p): bad magic: %#x\n",
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rw->eMrw_owner, rw, rw->eMrw_magic);
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abort();
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}
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if (rw->eMrw_read != 0 || rw->eMrw_write != 0) {
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fprintf(stderr,
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"%s:eMrwlock_read_enter(%p): already locked: %d/%d\n",
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rw->eMrw_owner, rw, rw->eMrw_read, rw->eMrw_write);
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abort();
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}
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rw->eMrw_read++;
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rw->eMrw_heldin = file;
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rw->eMrw_heldat = line;
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}
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void eMrwlock_write_enter(rw, file, line)
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eMrwlock_t *rw;
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char *file;
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int line;
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{
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if (rw->eMrw_magic != EMM_MAGIC) {
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fprintf(stderr, "%s:eMrwlock_write_enter(%p): bad magic: %#x\n",
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rw->eMrw_owner, rw, rw->eMrw_magic);
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abort();
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}
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if (rw->eMrw_read != 0 || rw->eMrw_write != 0) {
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fprintf(stderr,
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"%s:eMrwlock_write_enter(%p): already locked: %d/%d\n",
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rw->eMrw_owner, rw, rw->eMrw_read, rw->eMrw_write);
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abort();
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}
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rw->eMrw_write++;
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rw->eMrw_heldin = file;
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rw->eMrw_heldat = line;
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}
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void eMrwlock_downgrade(rw, file, line)
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eMrwlock_t *rw;
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char *file;
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int line;
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{
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if (rw->eMrw_magic != EMM_MAGIC) {
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fprintf(stderr, "%s:eMrwlock_write_enter(%p): bad magic: %#x\n",
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rw->eMrw_owner, rw, rw->eMrw_magic);
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abort();
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}
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if (rw->eMrw_read != 0 || rw->eMrw_write != 1) {
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fprintf(stderr,
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"%s:eMrwlock_write_enter(%p): already locked: %d/%d\n",
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rw->eMrw_owner, rw, rw->eMrw_read, rw->eMrw_write);
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abort();
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}
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rw->eMrw_write--;
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rw->eMrw_read++;
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rw->eMrw_heldin = file;
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rw->eMrw_heldat = line;
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}
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void eMrwlock_exit(rw)
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eMrwlock_t *rw;
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{
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if (rw->eMrw_magic != EMM_MAGIC) {
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fprintf(stderr, "%s:eMrwlock_exit(%p): bad magic: %#x\n",
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rw->eMrw_owner, rw, rw->eMrw_magic);
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abort();
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}
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if (rw->eMrw_read != 1 && rw->eMrw_write != 1) {
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fprintf(stderr, "%s:eMrwlock_exit(%p): not locked: %d/%d\n",
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rw->eMrw_owner, rw, rw->eMrw_read, rw->eMrw_write);
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abort();
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}
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if (rw->eMrw_read == 1)
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rw->eMrw_read--;
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else if (rw->eMrw_write == 1)
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rw->eMrw_write--;
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rw->eMrw_heldin = NULL;
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rw->eMrw_heldat = 0;
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}
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void eMrwlock_init(rw, who)
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eMrwlock_t *rw;
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char *who;
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{
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if (rw->eMrw_magic == EMM_MAGIC) { /* safe bet ? */
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fprintf(stderr,
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"%s:eMrwlock_init(%p): already initialised?: %#x\n",
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rw->eMrw_owner, rw, rw->eMrw_magic);
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abort();
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}
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rw->eMrw_magic = EMM_MAGIC;
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rw->eMrw_read = 0;
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rw->eMrw_write = 0;
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if (who != NULL)
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rw->eMrw_owner = strdup(who);
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else
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rw->eMrw_owner = NULL;
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}
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void eMrwlock_destroy(rw)
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eMrwlock_t *rw;
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{
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if (rw->eMrw_magic != EMM_MAGIC) {
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fprintf(stderr, "%s:eMrwlock_destroy(%p): bad magic: %#x\n",
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rw->eMrw_owner, rw, rw->eMrw_magic);
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abort();
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}
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memset(rw, 0xa5, sizeof(*rw));
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}
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