projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| 08734ccd | 1 | /* Handle real-time signal allocation. Generic version. |
| 2b778ceb | 2 | Copyright (C) 1997-2021 Free Software Foundation, Inc. |
| b6ab06ce UD |
3 | This file is part of the GNU C Library. |
| 4 | Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997. | |
| 5 | ||
| 6 | The GNU C Library is free software; you can redistribute it and/or | |
| 7 | modify it under the terms of the GNU Lesser General Public | |
| 8 | License as published by the Free Software Foundation; either | |
| 9 | version 2.1 of the License, or (at your option) any later version. | |
| 10 | ||
| 11 | The GNU C Library is distributed in the hope that it will be useful, | |
| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 14 | Lesser General Public License for more details. | |
| 15 | ||
| 16 | You should have received a copy of the GNU Lesser General Public | |
| 59ba27a6 | 17 | License along with the GNU C Library; if not, see |
| 5a82c748 | 18 | <https://www.gnu.org/licenses/>. */ |
| b6ab06ce UD |
19 | |
| 20 | #include <signal.h> | |
| 21 | ||
| 08734ccd RM |
22 | /* Another sysdeps file can #define this and then #include this file. */ |
| 23 | #ifndef RESERVED_SIGRT | |
| 24 | # define RESERVED_SIGRT 0 | |
| 25 | #endif | |
| 26 | ||
| b6ab06ce UD |
27 | /* In these variables we keep track of the used variables. If the |
| 28 | platform does not support any real-time signals we will define the | |
| 29 | values to some unreasonable value which will signal failing of all | |
| 30 | the functions below. */ | |
| 08734ccd RM |
31 | #ifdef __SIGRTMIN |
| 32 | static int current_rtmin = __SIGRTMIN + RESERVED_SIGRT; | |
| 33 | static int current_rtmax = __SIGRTMAX; | |
| b6ab06ce UD |
34 | #endif |
| 35 | ||
| 36 | /* Return number of available real-time signal with highest priority. */ | |
| 37 | int | |
| 38 | __libc_current_sigrtmin (void) | |
| 39 | { | |
| 40 | #ifdef __SIGRTMIN | |
| b6ab06ce | 41 | return current_rtmin; |
| 08734ccd RM |
42 | #else |
| 43 | return -1; | |
| 44 | #endif | |
| b6ab06ce UD |
45 | } |
| 46 | libc_hidden_def (__libc_current_sigrtmin) | |
| 08734ccd | 47 | strong_alias (__libc_current_sigrtmin, __libc_current_sigrtmin_private) |
| b6ab06ce UD |
48 | |
| 49 | /* Return number of available real-time signal with lowest priority. */ | |
| 50 | int | |
| 51 | __libc_current_sigrtmax (void) | |
| 52 | { | |
| 53 | #ifdef __SIGRTMIN | |
| b6ab06ce | 54 | return current_rtmax; |
| 08734ccd RM |
55 | #else |
| 56 | return -1; | |
| 57 | #endif | |
| b6ab06ce UD |
58 | } |
| 59 | libc_hidden_def (__libc_current_sigrtmax) | |
| 08734ccd | 60 | strong_alias (__libc_current_sigrtmax, __libc_current_sigrtmax_private) |
| b6ab06ce UD |
61 | |
| 62 | /* Allocate real-time signal with highest/lowest available | |
| 63 | priority. Please note that we don't use a lock since we assume | |
| 64 | this function to be called at program start. */ | |
| 65 | int | |
| 66 | __libc_allocate_rtsig (int high) | |
| 67 | { | |
| 68 | #ifndef __SIGRTMIN | |
| 69 | return -1; | |
| 70 | #else | |
| b6ab06ce | 71 | if (current_rtmin == -1 || current_rtmin > current_rtmax) |
| 08734ccd | 72 | /* We don't have any more signals available. */ |
| b6ab06ce UD |
73 | return -1; |
| 74 | ||
| 75 | return high ? current_rtmin++ : current_rtmax--; | |
| 76 | #endif | |
| 77 | } | |
| 08734ccd | 78 | strong_alias (__libc_allocate_rtsig, __libc_allocate_rtsig_private) |