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

https://bitbucket.org/freebsd/freebsd-head/ · C++ Header · 39 lines · 16 code · 6 blank · 17 comment · 4 complexity · a01cfaa50ad2a04fd1bec8787ce07bf4 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: mutex.h,v 1.6 2007/06/19 23:47:18 tbox Exp $ */
  18. #ifndef ISC_MUTEX_H
  19. #define ISC_MUTEX_H 1
  20. #include <isc/result.h> /* for ISC_R_ codes */
  21. typedef int isc_mutex_t;
  22. #define isc_mutex_init(mp) \
  23. (*(mp) = 0, ISC_R_SUCCESS)
  24. #define isc_mutex_lock(mp) \
  25. ((*(mp))++ == 0 ? ISC_R_SUCCESS : ISC_R_UNEXPECTED)
  26. #define isc_mutex_unlock(mp) \
  27. (--(*(mp)) == 0 ? ISC_R_SUCCESS : ISC_R_UNEXPECTED)
  28. #define isc_mutex_trylock(mp) \
  29. (*(mp) == 0 ? ((*(mp))++, ISC_R_SUCCESS) : ISC_R_LOCKBUSY)
  30. #define isc_mutex_destroy(mp) \
  31. (*(mp) == 0 ? (*(mp) = -1, ISC_R_SUCCESS) : ISC_R_UNEXPECTED)
  32. #define isc_mutex_stats(fp)
  33. #endif /* ISC_MUTEX_H */