86 lines
2.5 KiB
C
86 lines
2.5 KiB
C
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/* thread.c - Threading helpers
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Copyright (C) 2000 Thomas Moestl
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Copyright (C) 2002, 2003 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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#include <config.h>
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#include <sys/types.h>
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#include <sys/time.h>
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#include <unistd.h>
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#include <stdio.h>
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#include <stdarg.h>
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#include <pthread.h>
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#include <signal.h>
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#include <string.h>
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#include "thread.h"
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#include "error.h"
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#include "helpers.h"
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#include "conff.h"
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#if (TARGET==TARGET_LINUX) && !defined(THREADLIB_NPTL)
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volatile short int waiting=0; /* Has the main thread already done sigwait() ? */
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#endif
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pthread_attr_t attr_detached;
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#if DEBUG>0
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pthread_key_t thrid_key;
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#endif
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/* This is a handler for signals to the threads. We just hand the sigs on to the main thread.
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* Note that this may result in blocked locks. We have no means to open the locks here, because in LinuxThreads
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* the mutex functions are not async-signal safe. So, locks may still be active. We account for this by using
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* softlocks (see below) in any functions called after sigwait from main(). */
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#if (TARGET==TARGET_LINUX) && !defined(THREADLIB_NPTL)
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void thread_sig(int sig)
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{
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if (sig==SIGTSTP || sig==SIGTTOU || sig==SIGTTIN) {
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/* nonfatal signal. Ignore, because proper handling is very difficult. */
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return;
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}
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if (waiting) {
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log_warn("Caught signal %i.",sig);
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if (sig==SIGSEGV || sig==SIGILL || sig==SIGBUS)
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crash_msg("A fatal signal occured.");
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pthread_kill(main_thrid,SIGTERM);
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pthread_exit(NULL);
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} else {
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crash_msg("An error occured at startup.");
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_exit(1);
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}
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}
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#endif
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/* This is now defined as an inline function in thread.h */
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#if 0
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void usleep_r(unsigned long usec)
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{
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#if ((TARGET==TARGET_LINUX) || (TARGET==TARGET_BSD) || (TARGET==TARGET_CYGWIN)) && defined(HAVE_USLEEP)
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usleep(usec);
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#else
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struct timeval tv;
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tv.tv_sec=usec/1000000;
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tv.tv_usec=usec%1000000;
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select(0, NULL, NULL, NULL, tv);
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#endif
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}
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#endif
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