144 lines
4.5 KiB
C
144 lines
4.5 KiB
C
/* thread.h - Threading helpers
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Copyright (C) 2000 Thomas Moestl
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Copyright (C) 2002, 2003, 2005 Paul A. Rombouts
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This file is part of the pdnsd package.
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pdnsd is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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pdnsd is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with pdnsd; see the file COPYING. If not, see
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<http://www.gnu.org/licenses/>.
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*/
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#ifndef _THREAD_H_
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#define _THREAD_H_
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#include <config.h>
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#include <pthread.h>
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#include <signal.h>
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/* --- from main.c */
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extern sigset_t sigs_msk;
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/* --- */
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#if (TARGET==TARGET_LINUX) && !defined(THREADLIB_NPTL)
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extern volatile short int waiting;
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void thread_sig(int sig);
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#endif
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/* These are macros for setting up the signal handling of a new thread. They
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* are needed because the LinuxThreads implementation obviously has some
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* problems in signal handling, which makes the recommended solution (doing
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* sigwait() in one thread and blocking the signals in all threads) impossible.
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* So, for Linux, we have to install the fatal_sig handler.
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* It seems to me that signal handlers in fact aren't shared between threads
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* under Linux. Also, sigwait() does not seem to work as indicated in the docs */
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/* Note added by Paul Rombouts: In the new Native POSIX Thread Library for Linux (NPTL)
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signal handling has changed from per-thread signal handling to POSIX process signal handling,
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which makes the recommended solution mentioned by Thomas Moestl possible.
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In this case I can simply define THREAD_SIGINIT to be empty.
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The signals are blocked in main() before any threads are created,
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and we simply never unblock them except by calling sigwait() in main(). */
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#if (TARGET==TARGET_LINUX)
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# ifdef THREADLIB_NPTL
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# define THREAD_SIGINIT
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# else
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# ifdef THREADLIB_LINUXTHREADS2
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# define THREAD_SIGINIT { \
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struct sigaction action; \
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pthread_sigmask(SIG_UNBLOCK,&sigs_msk,NULL); \
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action.sa_handler = thread_sig; \
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action.sa_mask = sigs_msk; \
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action.sa_flags = 0; \
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sigaction(SIGINT,&action,NULL); \
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sigaction(SIGILL,&action,NULL); \
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sigaction(SIGABRT,&action,NULL); \
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sigaction(SIGFPE,&action,NULL); \
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sigaction(SIGSEGV,&action,NULL); \
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sigaction(SIGTSTP,&action,NULL); \
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sigaction(SIGTTOU,&action,NULL); \
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sigaction(SIGTTIN,&action,NULL); \
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sigaction(SIGTERM,&action,NULL); \
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action.sa_handler = SIG_IGN; \
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sigemptyset(&action.sa_mask); \
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action.sa_flags = 0; \
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sigaction(SIGPIPE,&action,NULL); \
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}
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# else
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# define THREAD_SIGINIT { \
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struct sigaction action; \
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pthread_sigmask(SIG_UNBLOCK,&sigs_msk,NULL); \
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action.sa_handler = thread_sig; \
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action.sa_mask = sigs_msk; \
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action.sa_flags = 0; \
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sigaction(SIGILL,&action,NULL); \
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sigaction(SIGABRT,&action,NULL); \
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sigaction(SIGFPE,&action,NULL); \
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sigaction(SIGSEGV,&action,NULL); \
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sigaction(SIGTSTP,&action,NULL); \
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sigaction(SIGTTOU,&action,NULL); \
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sigaction(SIGTTIN,&action,NULL); \
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action.sa_handler = SIG_IGN; \
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sigemptyset(&action.sa_mask); \
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action.sa_flags = 0; \
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sigaction(SIGPIPE,&action,NULL); \
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}
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# endif
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# endif
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#elif (TARGET==TARGET_BSD) || (TARGET==TARGET_CYGWIN)
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#define THREAD_SIGINIT pthread_sigmask(SIG_BLOCK,&sigs_msk,NULL)
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#else
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# error Unsupported platform!
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#endif
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/* This is a thread-safe usleep().
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Implementation of the BSD usleep function using nanosleep.
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*/
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inline static int usleep_r(unsigned long useconds)
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__attribute__((always_inline));
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inline static int usleep_r(unsigned long useconds)
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{
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struct timespec ts = { tv_sec: (useconds / 1000000),
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tv_nsec: (useconds % 1000000) * 1000ul };
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return nanosleep(&ts, NULL);
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}
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/* This is a thread-safe sleep().
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The semantics are somewhat different from the POSIX sleep function,
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but it suits our purposes.
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*/
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inline static int sleep_r (unsigned int seconds)
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__attribute__((always_inline));
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inline static int sleep_r (unsigned int seconds)
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{
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struct timespec ts = { tv_sec: seconds, tv_nsec: 0 };
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return nanosleep(&ts, NULL);
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}
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/* Used for creating detached threads */
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extern pthread_attr_t attr_detached;
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#if DEBUG>0
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/* Key for storing private thread ID's */
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extern pthread_key_t thrid_key;
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#endif
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#endif
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