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Diffstat (limited to 'include/isc/once.h')
| -rw-r--r-- | include/isc/once.h | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/include/isc/once.h b/include/isc/once.h new file mode 100644 index 0000000..f57d621 --- /dev/null +++ b/include/isc/once.h @@ -0,0 +1,32 @@ +/* + * Copyright (C) 2000, 2001 Internet Software Consortium. + * + * Permission to use, copy, modify, and 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 INTERNET SOFTWARE CONSORTIUM + * DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL + * INTERNET SOFTWARE CONSORTIUM 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: once.h,v 1.3 2001/01/09 21:57:56 bwelling Exp $ */ + +#ifndef ISC_ONCE_H +#define ISC_ONCE_H 1 + +#include <isc/result.h> + +typedef isc_boolean_t isc_once_t; + +#define ISC_ONCE_INIT ISC_FALSE + +#define isc_once_do(op, f) \ + (!*(op) ? (f(), *(op) = ISC_TRUE, ISC_R_SUCCESS) : ISC_R_SUCCESS) + +#endif /* ISC_ONCE_H */ |
