sysdeps/nptl/allocrtsig.c

   1 /* Handle real-time signal allocation.  NPTL version.
   2    Copyright (C) 2015-2016 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #include <signal.h>
  20 #include <nptl/pthreadP.h>
  21
  22 /* Up to three special signals might be used privately by libpthread.
  23    Figure out how many unique ones are actually used.  */
  24
  25 #ifdef SIGCANCEL
  26 # define SIGCANCEL_CONSUMES     1
  27 #else
  28 # define SIGCANCEL_CONSUMES     0
  29 #endif
  30
  31 #if defined SIGTIMER && (!defined SIGCANCEL || SIGTIMER != SIGCANCEL)
  32 # define SIGTIMER_CONSUMES      1
  33 #else
  34 # define SIGTIMER_CONSUMES      0
  35 #endif
  36
  37 #if (defined SIGSETXID \
  38      && (!defined SIGCANCEL || SIGSETXID != SIGCANCEL) \
  39      && (!defined SIGTIMER || SIGSETXID != SIGTIMER))
  40 # define SIGSETXID_CONSUMES     1
  41 #else
  42 # define SIGSETXID_CONSUMES     0
  43 #endif
  44
  45 /* This tells the generic code (included below) how many signal
  46    numbers need to be reserved for libpthread's private uses.  */
  47 #define RESERVED_SIGRT          \
  48   (SIGCANCEL_CONSUMES + SIGTIMER_CONSUMES + SIGSETXID_CONSUMES)
  49
  50 #include <signal/allocrtsig.c>