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sched.h
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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 #if !defined(_SCHED_H)
40 #define _SCHED_H
41
42 #undef PTW32_SCHED_LEVEL
43
44 #if defined(_POSIX_SOURCE)
45 #define PTW32_SCHED_LEVEL 0
46 /* Early POSIX */
47 #endif
48
49 #if defined(_POSIX_C_SOURCE) && _POSIX_C_SOURCE >= 199309
50 #undef PTW32_SCHED_LEVEL
51 #define PTW32_SCHED_LEVEL 1
52 /* Include 1b, 1c and 1d */
53 #endif
54
55 #if defined(INCLUDE_NP)
56 #undef PTW32_SCHED_LEVEL
57 #define PTW32_SCHED_LEVEL 2
58 /* Include Non-Portable extensions */
59 #endif
60
61 #define PTW32_SCHED_LEVEL_MAX 3
62
63 #if ( defined(_POSIX_C_SOURCE) && _POSIX_C_SOURCE >= 200112 ) || !defined(PTW32_SCHED_LEVEL)
64 #define PTW32_SCHED_LEVEL PTW32_SCHED_LEVEL_MAX
65 /* Include everything */
66 #endif
67
68
69 #if defined(__GNUC__) && !defined(__declspec)
70 # error Please upgrade your GNU compiler to one that supports __declspec.
71 #endif
72
73 /*
74 * When building the library, you should define PTW32_BUILD so that
75 * the variables/functions are exported correctly. When using the library,
76 * do NOT define PTW32_BUILD, and then the variables/functions will
77 * be imported correctly.
78 */
79 #if !defined(PTW32_STATIC_LIB)
80 # if defined(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 #if !defined(PTW32_CONFIG_H)
95 # if defined(WINCE)
96 # define NEED_ERRNO
97 # define NEED_SEM
98 # endif
99 # if defined(__MINGW64__)
100 # define HAVE_STRUCT_TIMESPEC
101 # define HAVE_MODE_T
102 # elif defined(_UWIN) || defined(__MINGW32__)
103 # define HAVE_MODE_T
104 # endif
105 #endif
106
107 /*
108 *
109 */
110
111 #if PTW32_SCHED_LEVEL >= PTW32_SCHED_LEVEL_MAX
112 #if defined(NEED_ERRNO)
113 #include "need_errno.h"
114 #else
115 #include <errno.h>
116 #endif
117 #endif /* PTW32_SCHED_LEVEL >= PTW32_SCHED_LEVEL_MAX */
118
119 #if (defined(__MINGW64__) || defined(__MINGW32__)) || defined(_UWIN)
120 # if PTW32_SCHED_LEVEL >= PTW32_SCHED_LEVEL_MAX
121 /* For pid_t */
122 # include <sys/types.h>
123 /* Required by Unix 98 */
124 # include <time.h>
125 # else
126 typedef int pid_t;
127 # endif
128 #else
129 typedef int pid_t;
130 #endif
131
132 /* Thread scheduling policies */
133
134 enum {
135 SCHED_OTHER = 0,
136 SCHED_FIFO,
137 SCHED_RR,
138 SCHED_MIN = SCHED_OTHER,
139 SCHED_MAX = SCHED_RR
140 };
141
142 struct sched_param {
143 int sched_priority;
144 };
145
146 #if defined(__cplusplus)
147 extern "C"
148 {
149 #endif /* __cplusplus */
150
151 PTW32_DLLPORT int __cdecl sched_yield (void);
152
153 PTW32_DLLPORT int __cdecl sched_get_priority_min (int policy);
154
155 PTW32_DLLPORT int __cdecl sched_get_priority_max (int policy);
156
157 PTW32_DLLPORT int __cdecl sched_setscheduler (pid_t pid, int policy);
158
159 PTW32_DLLPORT int __cdecl sched_getscheduler (pid_t pid);
160
161 /*
162 * Note that this macro returns ENOTSUP rather than
163 * ENOSYS as might be expected. However, returning ENOSYS
164 * should mean that sched_get_priority_{min,max} are
165 * not implemented as well as sched_rr_get_interval.
166 * This is not the case, since we just don't support
167 * round-robin scheduling. Therefore I have chosen to
168 * return the same value as sched_setscheduler when
169 * SCHED_RR is passed to it.
170 */
171 #define sched_rr_get_interval(_pid, _interval) \
172 ( errno = ENOTSUP, (int) -1 )
173
174
175 #if defined(__cplusplus)
176 } /* End of extern "C" */
177 #endif /* __cplusplus */
178
179 #undef PTW32_SCHED_LEVEL
180 #undef PTW32_SCHED_LEVEL_MAX
181
182 #endif /* !_SCHED_H */
183
pid_t
int pid_t
Definition: sched.h:129
sched_param::sched_priority
int sched_priority
Definition: sched.h:143
SCHED_MAX
Definition: sched.h:139
sched_param
Definition: sched.h:142
__cdecl
#define __cdecl
Definition: need_errno.h:49
SCHED_OTHER
Definition: sched.h:135
PTW32_DLLPORT
#define PTW32_DLLPORT
Definition: sched.h:83
sched_get_priority_min
PTW32_DLLPORT int __cdecl sched_get_priority_min(int policy)
Definition: sched_get_priority_min.c:120
SCHED_FIFO
Definition: sched.h:136
sched_getscheduler
PTW32_DLLPORT int __cdecl sched_getscheduler(pid_t pid)
Definition: sched_getscheduler.c:42
need_errno.h
SCHED_RR
Definition: sched.h:137
sched_get_priority_max
PTW32_DLLPORT int __cdecl sched_get_priority_max(int policy)
Definition: sched_get_priority_max.c:119
sched_setscheduler
PTW32_DLLPORT int __cdecl sched_setscheduler(pid_t pid, int policy)
Definition: sched_setscheduler.c:42
SCHED_MIN
Definition: sched.h:138
sched_yield
PTW32_DLLPORT int __cdecl sched_yield(void)
Definition: sched_yield.c:42