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b7cb624b UD |
1 | /* Handle real-time signal allocation. |
2 | Copyright (C) 1997,98,99,2002 Free Software Foundation, Inc. | |
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 | |
17 | License along with the GNU C Library; if not, write to the Free | |
18 | Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA | |
19 | 02111-1307 USA. */ | |
20 | ||
21 | #include <signal.h> | |
22 | ||
23 | /* In these variables we keep track of the used variables. If the | |
24 | platform does not support any real-time signals we will define the | |
25 | values to some unreasonable value which will signal failing of all | |
26 | the functions below. */ | |
27 | #ifndef __SIGRTMIN | |
28 | static int current_rtmin = -1; | |
29 | static int current_rtmax = -1; | |
30 | #else | |
31 | static int current_rtmin; | |
32 | static int current_rtmax; | |
33 | ||
34 | static int initialized; | |
35 | ||
b323b11c | 36 | #include <testrtsig.h> |
b7cb624b UD |
37 | |
38 | static void | |
39 | init (void) | |
40 | { | |
41 | if (!kernel_has_rtsig ()) | |
42 | { | |
43 | current_rtmin = -1; | |
44 | current_rtmax = -1; | |
45 | } | |
46 | else | |
47 | { | |
48 | current_rtmin = __SIGRTMIN; | |
49 | current_rtmax = __SIGRTMAX; | |
50 | } | |
51 | initialized = 1; | |
52 | } | |
53 | #endif | |
54 | ||
55 | /* Return number of available real-time signal with highest priority. */ | |
56 | int | |
57 | __libc_current_sigrtmin (void) | |
58 | { | |
59 | #ifdef __SIGRTMIN | |
60 | if (!initialized) | |
61 | init (); | |
62 | #endif | |
63 | return current_rtmin; | |
64 | } | |
a4baf360 | 65 | libc_hidden_def (__libc_current_sigrtmin) |
b7cb624b UD |
66 | |
67 | /* Return number of available real-time signal with lowest priority. */ | |
68 | int | |
69 | __libc_current_sigrtmax (void) | |
70 | { | |
71 | #ifdef __SIGRTMIN | |
72 | if (!initialized) | |
73 | init (); | |
74 | #endif | |
75 | return current_rtmax; | |
76 | } | |
a4baf360 | 77 | libc_hidden_def (__libc_current_sigrtmax) |
b7cb624b UD |
78 | |
79 | /* Allocate real-time signal with highest/lowest available | |
80 | priority. Please note that we don't use a lock since we assume | |
81 | this function to be called at program start. */ | |
82 | int | |
83 | __libc_allocate_rtsig (int high) | |
84 | { | |
85 | #ifndef __SIGRTMIN | |
86 | return -1; | |
87 | #else | |
88 | if (!initialized) | |
89 | init (); | |
90 | if (current_rtmin == -1 || current_rtmin > current_rtmax) | |
91 | /* We don't have anymore signal available. */ | |
92 | return -1; | |
93 | ||
94 | return high ? current_rtmin++ : current_rtmax--; | |
95 | #endif | |
96 | } |