diff options
Diffstat (limited to 'REORG.TODO/signal/allocrtsig.c')
-rw-r--r-- | REORG.TODO/signal/allocrtsig.c | 78 |
1 files changed, 78 insertions, 0 deletions
diff --git a/REORG.TODO/signal/allocrtsig.c b/REORG.TODO/signal/allocrtsig.c new file mode 100644 index 0000000000..d2a4687d68 --- /dev/null +++ b/REORG.TODO/signal/allocrtsig.c @@ -0,0 +1,78 @@ +/* Handle real-time signal allocation. Generic version. + Copyright (C) 1997-2017 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + <http://www.gnu.org/licenses/>. */ + +#include <signal.h> + +/* Another sysdeps file can #define this and then #include this file. */ +#ifndef RESERVED_SIGRT +# define RESERVED_SIGRT 0 +#endif + +/* In these variables we keep track of the used variables. If the + platform does not support any real-time signals we will define the + values to some unreasonable value which will signal failing of all + the functions below. */ +#ifdef __SIGRTMIN +static int current_rtmin = __SIGRTMIN + RESERVED_SIGRT; +static int current_rtmax = __SIGRTMAX; +#endif + +/* Return number of available real-time signal with highest priority. */ +int +__libc_current_sigrtmin (void) +{ +#ifdef __SIGRTMIN + return current_rtmin; +#else + return -1; +#endif +} +libc_hidden_def (__libc_current_sigrtmin) +strong_alias (__libc_current_sigrtmin, __libc_current_sigrtmin_private) + +/* Return number of available real-time signal with lowest priority. */ +int +__libc_current_sigrtmax (void) +{ +#ifdef __SIGRTMIN + return current_rtmax; +#else + return -1; +#endif +} +libc_hidden_def (__libc_current_sigrtmax) +strong_alias (__libc_current_sigrtmax, __libc_current_sigrtmax_private) + +/* Allocate real-time signal with highest/lowest available + priority. Please note that we don't use a lock since we assume + this function to be called at program start. */ +int +__libc_allocate_rtsig (int high) +{ +#ifndef __SIGRTMIN + return -1; +#else + if (current_rtmin == -1 || current_rtmin > current_rtmax) + /* We don't have any more signals available. */ + return -1; + + return high ? current_rtmin++ : current_rtmax--; +#endif +} +strong_alias (__libc_allocate_rtsig, __libc_allocate_rtsig_private) |