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