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      1 /*
      2  * Copyright (c) 1994, 1995, 1996
      3  *	The Regents of the University of California.  All rights reserved.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions
      7  * are met:
      8  * 1. Redistributions of source code must retain the above copyright
      9  *    notice, this list of conditions and the following disclaimer.
     10  * 2. Redistributions in binary form must reproduce the above copyright
     11  *    notice, this list of conditions and the following disclaimer in the
     12  *    documentation and/or other materials provided with the distribution.
     13  * 3. All advertising materials mentioning features or use of this software
     14  *    must display the following acknowledgement:
     15  *	This product includes software developed by the Computer Systems
     16  *	Engineering Group at Lawrence Berkeley Laboratory.
     17  * 4. Neither the name of the University nor of the Laboratory may be used
     18  *    to endorse or promote products derived from this software without
     19  *    specific prior written permission.
     20  *
     21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     31  * SUCH DAMAGE.
     32  */
     33 
     34 #ifndef thread_local_h
     35 #define	thread_local_h
     36 
     37 /*
     38  * This defines thread_local to specify thread-local storage, if it
     39  * is not already defined.
     40  *
     41  * C11, if __STDC_NO_THREADS__ is not defined to be 1, defines
     42  * _Thread_local to indicate thread-local storage.  (You can also
     43  * include <threads.h> to so define it, but we don't use any of
     44  * the other stuff there.)
     45  *
     46  * Otherwise, we define it ourselves, based on the compiler.
     47  *
     48  * This is taken from https://stackoverflow.com/a/18298965/16139739.
     49  */
     50 #ifndef thread_local
     51   #if __STDC_VERSION__ >= 201112 && !defined __STDC_NO_THREADS__
     52     #define thread_local _Thread_local
     53   #elif defined __TINYC__
     54     #define thread_local
     55     #warning "Some libpcap calls will not be thread-safe."
     56   #elif defined _WIN32 && ( \
     57          defined _MSC_VER || \
     58          defined __ICL || \
     59          defined __DMC__ || \
     60          defined __BORLANDC__ )
     61     #define thread_local __declspec(thread)
     62   /* note that ICC (linux) and Clang are covered by __GNUC__ */
     63   #elif defined __GNUC__ || \
     64          defined __SUNPRO_C || \
     65          defined __xlC__
     66     #define thread_local __thread
     67   #else
     68     #error "Cannot define thread_local"
     69   #endif
     70 #endif
     71 
     72 #endif
     73