diff options
Diffstat (limited to 'lib/isc/nothreads/include/isc/mutex.h')
| -rw-r--r-- | lib/isc/nothreads/include/isc/mutex.h | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/lib/isc/nothreads/include/isc/mutex.h b/lib/isc/nothreads/include/isc/mutex.h new file mode 100644 index 0000000..1f2187b --- /dev/null +++ b/lib/isc/nothreads/include/isc/mutex.h @@ -0,0 +1,39 @@ +/* + * Copyright (C) 2004, 2007 Internet Systems Consortium, Inc. ("ISC") + * Copyright (C) 2000, 2001 Internet Software Consortium. + * + * Permission to use, copy, modify, and/or distribute this software for any + * purpose with or without fee is hereby granted, provided that the above + * copyright notice and this permission notice appear in all copies. + * + * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH + * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY + * AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT, + * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM + * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE + * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR + * PERFORMANCE OF THIS SOFTWARE. + */ + +/* $Id: mutex.h,v 1.6 2007/06/19 23:47:18 tbox Exp $ */ + +#ifndef ISC_MUTEX_H +#define ISC_MUTEX_H 1 + +#include <isc/result.h> /* for ISC_R_ codes */ + +typedef int isc_mutex_t; + +#define isc_mutex_init(mp) \ + (*(mp) = 0, ISC_R_SUCCESS) +#define isc_mutex_lock(mp) \ + ((*(mp))++ == 0 ? ISC_R_SUCCESS : ISC_R_UNEXPECTED) +#define isc_mutex_unlock(mp) \ + (--(*(mp)) == 0 ? ISC_R_SUCCESS : ISC_R_UNEXPECTED) +#define isc_mutex_trylock(mp) \ + (*(mp) == 0 ? ((*(mp))++, ISC_R_SUCCESS) : ISC_R_LOCKBUSY) +#define isc_mutex_destroy(mp) \ + (*(mp) == 0 ? (*(mp) = -1, ISC_R_SUCCESS) : ISC_R_UNEXPECTED) +#define isc_mutex_stats(fp) + +#endif /* ISC_MUTEX_H */ |