include/urcu/assert.h

   1 #ifndef _URCU_ASSERT_H
   2 #define _URCU_ASSERT_H
   3
   4 /*
   5  * urcu/assert.h
   6  *
   7  * Userspace RCU assertion facilities.
   8  *
   9  * Copyright (c) 2021 Francis Deslauriers <francis.deslauriers@efficios.com>
  10  *
  11  * Permission is hereby granted, free of charge, to any person obtaining a copy
  12  * of this software and associated documentation files (the "Software"), to deal
  13  * in the Software without restriction, including without limitation the rights
  14  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  15  * copies of the Software, and to permit persons to whom the Software is
  16  * furnished to do so, subject to the following conditions:
  17  *
  18  * The above copyright notice and this permission notice shall be included in
  19  * all copies or substantial portions of the Software.
  20  */
  21
  22 #include <urcu/config.h>
  23
  24 /*
  25  * Force usage of an expression to prevent unused expression compiler warning.
  26  */
  27 #define _urcu_use_expression(_expr) ((void) sizeof((void) (_expr), 0))
  28
  29 #ifdef NDEBUG
  30 /*
  31  * Vanilla assert() replacement. When NDEBUG is defined, the expression is
  32  * consumed to prevent unused variable compile warnings.
  33  */
  34 # define urcu_posix_assert(_cond) _urcu_use_expression(_cond)
  35 #else
  36 # include <assert.h>
  37 # define urcu_posix_assert(_cond) assert(_cond)
  38 #endif
  39
  40 #if defined(DEBUG_RCU) || defined(CONFIG_RCU_DEBUG)
  41
  42 /*
  43  * Enables debugging/expensive assertions to be used in fast paths and only
  44  * enabled on demand. When disabled, the expression is consumed to prevent
  45  * unused variable compile warnings.
  46  */
  47 # define urcu_assert_debug(_cond) urcu_posix_assert(_cond)
  48 #else
  49 # define urcu_assert_debug(_cond) _urcu_use_expression(_cond)
  50 #endif
  51
  52 #endif /* _URCU_ASSERT_H */