1 /*
2 * Module: sched.h
3 *
4 * Purpose:
5 * Provides an implementation of POSIX realtime extensions
6 * as defined in
7 *
8 * POSIX 1003.1b-1993 (POSIX.1b)
9 *
10 * --------------------------------------------------------------------------
11 *
12 * Pthreads-win32 - POSIX Threads Library for Win32
13 * Copyright(C) 1998 John E. Bossom
14 * Copyright(C) 1999,2005 Pthreads-win32 contributors
15 *
16 * Contact Email: rpj@callisto.canberra.edu.au
17 *
18 * The current list of contributors is contained
19 * in the file CONTRIBUTORS included with the source
20 * code distribution. The list can also be seen at the
21 * following World Wide Web location:
22 * http://sources.redhat.com/pthreads-win32/contributors.html
23 *
24 * This library is free software; you can redistribute it and/or
25 * modify it under the terms of the GNU Lesser General Public
26 * License as published by the Free Software Foundation; either
27 * version 2 of the License, or (at your option) any later version.
28 *
29 * This library is distributed in the hope that it will be useful,
30 * but WITHOUT ANY WARRANTY; without even the implied warranty of
31 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
32 * Lesser General Public License for more details.
33 *
34 * You should have received a copy of the GNU Lesser General Public
35 * License along with this library in the file COPYING.LIB;
36 * if not, write to the Free Software Foundation, Inc.,
37 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
38 */
39 #ifndef _SCHED_H
40 #define _SCHED_H
41
42 #undef PTW32_LEVEL
43
44 #if defined(_POSIX_SOURCE)
45 #define PTW32_LEVEL 0
46 /* Early POSIX */
47 #endif
48
49 #if defined(_POSIX_C_SOURCE) && _POSIX_C_SOURCE >= 199309
50 #undef PTW32_LEVEL
51 #define PTW32_LEVEL 1
52 /* Include 1b, 1c and 1d */
53 #endif
54
55 #if defined(INCLUDE_NP)
56 #undef PTW32_LEVEL
57 #define PTW32_LEVEL 2
58 /* Include Non-Portable extensions */
59 #endif
60
61 #define PTW32_LEVEL_MAX 3
62
63 #if !defined(PTW32_LEVEL)
64 #define PTW32_LEVEL PTW32_LEVEL_MAX
65 /* Include everything */
66 #endif
67
68
69 #if __GNUC__ && ! defined (__declspec)
70 # error Please upgrade your GNU compiler to one that supports __declspec.
71 #endif
72
73 /*
74 * When building the DLL code, you should define PTW32_BUILD so that
75 * the variables/functions are exported correctly. When using the DLL,
76 * do NOT define PTW32_BUILD, and then the variables/functions will
77 * be imported correctly.
78 */
79 #ifndef PTW32_STATIC_LIB
80 # ifdef PTW32_BUILD
81 # define PTW32_DLLPORT __declspec (dllexport)
82 # else
83 # define PTW32_DLLPORT __declspec (dllimport)
84 # endif
85 #else
86 # define PTW32_DLLPORT
87 #endif
88
89 /*
90 * This is a duplicate of what is in the autoconf config.h,
91 * which is only used when building the pthread-win32 libraries.
92 */
93
94 #ifndef PTW32_CONFIG_H
95 # if defined(WINCE)
96 # define NEED_ERRNO
97 # define NEED_SEM
98 # endif
99 # if defined(_UWIN) || defined(__MINGW32__)
100 # define HAVE_MODE_T
101 # endif
102 #endif
103
104 /*
105 *
106 */
107
108 #if PTW32_LEVEL >= PTW32_LEVEL_MAX
109 #ifdef NEED_ERRNO
110 #include "need_errno.h"
111 #else
112 #include <errno.h>
113 #endif
114 #endif /* PTW32_LEVEL >= PTW32_LEVEL_MAX */
115
116 #if defined(__MINGW32__) || defined(_UWIN)
117 #if PTW32_LEVEL >= PTW32_LEVEL_MAX
118 /* For pid_t */
119 # include <sys/types.h>
120 /* Required by Unix 98 */
121 # include <time.h>
122 #endif /* PTW32_LEVEL >= PTW32_LEVEL_MAX */
123 #else
124 typedef int pid_t;
125 #endif
126
127 /* Thread scheduling policies */
128
129 enum {
130 SCHED_OTHER = 0,
131 SCHED_FIFO,
132 SCHED_RR,
133 SCHED_MIN = SCHED_OTHER,
134 SCHED_MAX = SCHED_RR
135 };
136
137 struct sched_param {
138 int sched_priority;
139 };
140
141 #ifdef __cplusplus
142 extern "C"
143 {
144 #endif /* __cplusplus */
145
146 PTW32_DLLPORT int __cdecl sched_yield (void);
147
148 PTW32_DLLPORT int __cdecl sched_get_priority_min (int policy);
149
150 PTW32_DLLPORT int __cdecl sched_get_priority_max (int policy);
151
152 PTW32_DLLPORT int __cdecl sched_setscheduler (pid_t pid, int policy);
153
154 PTW32_DLLPORT int __cdecl sched_getscheduler (pid_t pid);
155
156 /*
157 * Note that this macro returns ENOTSUP rather than
158 * ENOSYS as might be expected. However, returning ENOSYS
159 * should mean that sched_get_priority_{min,max} are
160 * not implemented as well as sched_rr_get_interval.
161 * This is not the case, since we just don't support
162 * round-robin scheduling. Therefore I have chosen to
163 * return the same value as sched_setscheduler when
164 * SCHED_RR is passed to it.
165 */
166 #define sched_rr_get_interval(_pid, _interval) \
167 ( errno = ENOTSUP, (int) -1 )
168
169
170 #ifdef __cplusplus
171 } /* End of extern "C" */
172 #endif /* __cplusplus */
173
174 #undef PTW32_LEVEL
175 #undef PTW32_LEVEL_MAX
176
177 #endif /* !_SCHED_H */
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