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/*
* Copyright (C) 2003 by Darren Reed.
*
* See the IPFILTER.LICENCE file for details on licencing.
*
* $Id: rwlock_emul.c,v 1.1.4.1 2006/06/16 17:21:17 darrenr Exp $
*/
#include "ipf.h"
#define EMM_MAGIC 0x97dd8b3a
void eMrwlock_read_enter(rw, file, line)
eMrwlock_t *rw;
char *file;
int line;
{
if (rw->eMrw_magic != EMM_MAGIC) {
fprintf(stderr, "%s:eMrwlock_read_enter(%p): bad magic: %#x\n",
rw->eMrw_owner, rw, rw->eMrw_magic);
abort();
}
if (rw->eMrw_read != 0 || rw->eMrw_write != 0) {
fprintf(stderr,
"%s:eMrwlock_read_enter(%p): already locked: %d/%d\n",
rw->eMrw_owner, rw, rw->eMrw_read, rw->eMrw_write);
abort();
}
rw->eMrw_read++;
rw->eMrw_heldin = file;
rw->eMrw_heldat = line;
}
void eMrwlock_write_enter(rw, file, line)
eMrwlock_t *rw;
char *file;
int line;
{
if (rw->eMrw_magic != EMM_MAGIC) {
fprintf(stderr, "%s:eMrwlock_write_enter(%p): bad magic: %#x\n",
rw->eMrw_owner, rw, rw->eMrw_magic);
abort();
}
if (rw->eMrw_read != 0 || rw->eMrw_write != 0) {
fprintf(stderr,
"%s:eMrwlock_write_enter(%p): already locked: %d/%d\n",
rw->eMrw_owner, rw, rw->eMrw_read, rw->eMrw_write);
abort();
}
rw->eMrw_write++;
rw->eMrw_heldin = file;
rw->eMrw_heldat = line;
}
void eMrwlock_downgrade(rw, file, line)
eMrwlock_t *rw;
char *file;
int line;
{
if (rw->eMrw_magic != EMM_MAGIC) {
fprintf(stderr, "%s:eMrwlock_write_enter(%p): bad magic: %#x\n",
rw->eMrw_owner, rw, rw->eMrw_magic);
abort();
}
if (rw->eMrw_read != 0 || rw->eMrw_write != 1) {
fprintf(stderr,
"%s:eMrwlock_write_enter(%p): already locked: %d/%d\n",
rw->eMrw_owner, rw, rw->eMrw_read, rw->eMrw_write);
abort();
}
rw->eMrw_write--;
rw->eMrw_read++;
rw->eMrw_heldin = file;
rw->eMrw_heldat = line;
}
void eMrwlock_exit(rw)
eMrwlock_t *rw;
{
if (rw->eMrw_magic != EMM_MAGIC) {
fprintf(stderr, "%s:eMrwlock_exit(%p): bad magic: %#x\n",
rw->eMrw_owner, rw, rw->eMrw_magic);
abort();
}
if (rw->eMrw_read != 1 && rw->eMrw_write != 1) {
fprintf(stderr, "%s:eMrwlock_exit(%p): not locked: %d/%d\n",
rw->eMrw_owner, rw, rw->eMrw_read, rw->eMrw_write);
abort();
}
if (rw->eMrw_read == 1)
rw->eMrw_read--;
else if (rw->eMrw_write == 1)
rw->eMrw_write--;
rw->eMrw_heldin = NULL;
rw->eMrw_heldat = 0;
}
void eMrwlock_init(rw, who)
eMrwlock_t *rw;
char *who;
{
if (rw->eMrw_magic == EMM_MAGIC) { /* safe bet ? */
fprintf(stderr,
"%s:eMrwlock_init(%p): already initialised?: %#x\n",
rw->eMrw_owner, rw, rw->eMrw_magic);
abort();
}
rw->eMrw_magic = EMM_MAGIC;
rw->eMrw_read = 0;
rw->eMrw_write = 0;
if (who != NULL)
rw->eMrw_owner = strdup(who);
else
rw->eMrw_owner = NULL;
}
void eMrwlock_destroy(rw)
eMrwlock_t *rw;
{
if (rw->eMrw_magic != EMM_MAGIC) {
fprintf(stderr, "%s:eMrwlock_destroy(%p): bad magic: %#x\n",
rw->eMrw_owner, rw, rw->eMrw_magic);
abort();
}
memset(rw, 0xa5, sizeof(*rw));
}
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