/* $NetBSD: rwlock_emul.c,v 1.2 2012/07/22 14:27:37 darrenr Exp $ */ /* * Copyright (C) 2012 by Darren Reed. * * See the IPFILTER.LICENCE file for details on licencing. * * Id: rwlock_emul.c,v 1.1.1.2 2012/07/22 13:44:42 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; } static int initcount = 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; initcount++; } 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(); } if (rw->eMrw_owner != NULL) free(rw->eMrw_owner); memset(rw, 0xa5, sizeof(*rw)); initcount--; } void ipf_rwlock_clean() { if (initcount != 0) abort(); }