common/utils/cleanup.h

   1 /* nbdkit
   2  * Copyright (C) 2013-2019 Red Hat Inc.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions are
   6  * met:
   7  *
   8  * * Redistributions of source code must retain the above copyright
   9  * notice, this list of conditions and the following disclaimer.
  10  *
  11  * * Redistributions in binary form must reproduce the above copyright
  12  * notice, this list of conditions and the following disclaimer in the
  13  * documentation and/or other materials provided with the distribution.
  14  *
  15  * * Neither the name of Red Hat nor the names of its contributors may be
  16  * used to endorse or promote products derived from this software without
  17  * specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY RED HAT AND CONTRIBUTORS ''AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  21  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
  22  * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL RED HAT OR
  23  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  24  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  25  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
  26  * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  27  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  28  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  29  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  */
  32
  33 #ifndef NBDKIT_CLEANUP_H
  34 #define NBDKIT_CLEANUP_H
  35
  36 #include <pthread.h>
  37 #include <assert.h>
  38
  39 /* cleanup.c */
  40 extern void cleanup_free (void *ptr);
  41 #define CLEANUP_FREE __attribute__((cleanup (cleanup_free)))
  42 extern void cleanup_unlock (pthread_mutex_t **ptr);
  43 #define CLEANUP_UNLOCK __attribute__((cleanup (cleanup_unlock)))
  44 #define ACQUIRE_LOCK_FOR_CURRENT_SCOPE(mutex) \
  45   CLEANUP_UNLOCK pthread_mutex_t *_lock = mutex; \
  46   do { \
  47     int _r = pthread_mutex_lock (_lock); \
  48     assert (!_r); \
  49   } while (0)
  50
  51 /* cleanup-nbdkit.c */
  52 struct nbdkit_extents;
  53 extern void cleanup_extents_free (struct nbdkit_extents **ptr);
  54 #define CLEANUP_EXTENTS_FREE __attribute__((cleanup (cleanup_extents_free)))
  55
  56 #endif /* NBDKIT_CLEANUP_H */