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annotate lib/pthread_sigmask.c @ 16229:daac1ca4c436

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inttypes: Modernize. * lib/inttypes.in.h (strtoimax, strtoumax): Use the C++ safe idioms. * modules/inttypes-incomplete (Depends-on): Add snippet/c++defs. (Makefile.am): Update inttypes.h rule.
author Bruno Haible <bruno@clisp.org>
date Thu, 05 Jan 2012 18:42:08 +0100
parents 8250f2777afc
children 07495c580e2e
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1 /* POSIX compatible signal blocking for threads.
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2 Copyright (C) 2011-2012 Free Software Foundation, Inc.
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3
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4 This program is free software: you can redistribute it and/or modify
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5 it under the terms of the GNU General Public License as published by
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6 the Free Software Foundation; either version 3 of the License, or
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7 (at your option) any later version.
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8
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9 This program is distributed in the hope that it will be useful,
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10 but WITHOUT ANY WARRANTY; without even the implied warranty of
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11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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12 GNU General Public License for more details.
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13
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14 You should have received a copy of the GNU General Public License
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15 along with this program. If not, see <http://www.gnu.org/licenses/>. */
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16
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17 #include <config.h>
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18
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19 /* Specification. */
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20 #include <signal.h>
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21
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22 #include <errno.h>
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23 #include <stddef.h>
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24
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25 #if PTHREAD_SIGMASK_UNBLOCK_BUG
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26 # include <unistd.h>
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27 #endif
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28
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29 int
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30 pthread_sigmask (int how, const sigset_t *new_mask, sigset_t *old_mask)
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31 #undef pthread_sigmask
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32 {
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33 #if HAVE_PTHREAD_SIGMASK
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34 int ret = pthread_sigmask (how, new_mask, old_mask);
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35 # if PTHREAD_SIGMASK_INEFFECTIVE
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36 if (ret == 0)
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37 {
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38 /* Detect whether pthread_sigmask is currently ineffective.
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39 Don't cache the information: libpthread.so could be dynamically
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40 loaded after the program started and after pthread_sigmask was
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41 called for the first time. */
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42 if (pthread_sigmask (1729, NULL, NULL) == 0)
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43 {
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44 /* pthread_sigmask is currently ineffective. The program is not
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45 linked to -lpthread. So use sigprocmask instead. */
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46 return (sigprocmask (how, new_mask, old_mask) < 0 ? errno : 0);
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47 }
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48 }
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49 # endif
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50 # if PTHREAD_SIGMASK_FAILS_WITH_ERRNO
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51 if (ret == -1)
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52 return errno;
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53 # endif
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54 # if PTHREAD_SIGMASK_UNBLOCK_BUG
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55 if (ret == 0
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56 && new_mask != NULL
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57 && (how == SIG_UNBLOCK || how == SIG_SETMASK))
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58 {
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59 /* Give the OS the opportunity to raise signals that were pending before
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60 the pthread_sigmask call and have now been unblocked. */
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61 usleep (1);
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62 }
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63 # endif
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64 return ret;
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65 #else
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66 int ret = sigprocmask (how, new_mask, old_mask);
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67 return (ret < 0 ? errno : 0);
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68 #endif
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69 }