/contrib/bind9/lib/isc/nothreads/include/isc/once.h

https://bitbucket.org/freebsd/freebsd-head/ · C++ Header · 32 lines · 8 code · 7 blank · 17 comment · 0 complexity · 574612d57e56245bda0af4f1bf775e2d MD5 · raw file

  1. /*
  2. * Copyright (C) 2004, 2007 Internet Systems Consortium, Inc. ("ISC")
  3. * Copyright (C) 2000, 2001 Internet Software Consortium.
  4. *
  5. * Permission to use, copy, modify, and/or distribute this software for any
  6. * purpose with or without fee is hereby granted, provided that the above
  7. * copyright notice and this permission notice appear in all copies.
  8. *
  9. * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
  10. * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
  11. * AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
  12. * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
  13. * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
  14. * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
  15. * PERFORMANCE OF THIS SOFTWARE.
  16. */
  17. /* $Id: once.h,v 1.6 2007/06/19 23:47:18 tbox Exp $ */
  18. #ifndef ISC_ONCE_H
  19. #define ISC_ONCE_H 1
  20. #include <isc/result.h>
  21. typedef isc_boolean_t isc_once_t;
  22. #define ISC_ONCE_INIT ISC_FALSE
  23. #define isc_once_do(op, f) \
  24. (!*(op) ? (f(), *(op) = ISC_TRUE, ISC_R_SUCCESS) : ISC_R_SUCCESS)
  25. #endif /* ISC_ONCE_H */