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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-embedded (PTE) - POSIX Threads Library for embedded systems
13  * Copyright(C) 2008 Jason Schmidlapp
14  *
15  * Contact Email: jschmidlapp@users.sourceforge.net
16  *
17  *
18  * Pthreads-embedded (PTE) - POSIX Threads Library for embedded systems
19  * Copyright(C) 2008 Jason Schmidlapp
20  *
21  * Contact Email: jschmidlapp@users.sourceforge.net
22  *
23  *
24  * Based upon Pthreads-win32 - POSIX Threads Library for Win32
25  * Copyright(C) 1998 John E. Bossom
26  * Copyright(C) 1999,2005 Pthreads-win32 contributors
27  *
28  * Contact Email: rpj@callisto.canberra.edu.au
29  *
30  * The original list of contributors to the Pthreads-win32 project
31  * is contained in the file CONTRIBUTORS.ptw32 included with the
32  * source code distribution. The list can also be seen at the
33  * following World Wide Web location:
34  * http://sources.redhat.com/pthreads-win32/contributors.html
35  *
36  * This library is free software; you can redistribute it and/or
37  * modify it under the terms of the GNU Lesser General Public
38  * License as published by the Free Software Foundation; either
39  * version 2 of the License, or (at your option) any later version.
40  *
41  * This library is distributed in the hope that it will be useful,
42  * but WITHOUT ANY WARRANTY; without even the implied warranty of
43  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
44  * Lesser General Public License for more details.
45  *
46  * You should have received a copy of the GNU Lesser General Public
47  * License along with this library in the file COPYING.LIB;
48  * if not, write to the Free Software Foundation, Inc.,
49  * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
50  */
51 #ifndef _SCHED_H
52 #define _SCHED_H
53 
54 #include <pte_types.h>
55 
56 #undef PTE_LEVEL
57 
58 #if defined(_POSIX_SOURCE)
59 #define PTE_LEVEL 0
60 /* Early POSIX */
61 #endif
62 
63 #if defined(_POSIX_C_SOURCE) && _POSIX_C_SOURCE >= 199309
64 #undef PTE_LEVEL
65 #define PTE_LEVEL 1
66 /* Include 1b, 1c and 1d */
67 #endif
68 
69 #if defined(INCLUDE_NP)
70 #undef PTE_LEVEL
71 #define PTE_LEVEL 2
72 /* Include Non-Portable extensions */
73 #endif
74 
75 #define PTE_LEVEL_MAX 3
76 
77 #if !defined(PTE_LEVEL)
78 #define PTE_LEVEL PTE_LEVEL_MAX
79 /* Include everything */
80 #endif
81 
82 /*
83  *
84  */
85 
86 /* Thread scheduling policies */
87 
88 enum
89 {
95 };
96 
98  {
100  };
101 
102 #ifdef __cplusplus
103 extern "C"
104  {
105 #endif /* __cplusplus */
106 
107  int sched_yield (void);
108 
109  int sched_get_priority_min (int policy);
110 
111  int sched_get_priority_max (int policy);
112 
113  int sched_setscheduler (pid_t pid, int policy);
114 
115  /*
116  * Note that this macro returns ENOTSUP rather than
117  * ENOSYS as might be expected. However, returning ENOSYS
118  * should mean that sched_get_priority_{min,max} are
119  * not implemented as well as sched_rr_get_interval.
120  * This is not the case, since we just don't support
121  * round-robin scheduling. Therefore I have chosen to
122  * return the same value as sched_setscheduler when
123  * SCHED_RR is passed to it.
124  */
125 #define sched_rr_get_interval(_pid, _interval) \
126  ( errno = ENOTSUP, (int) -1 )
127 
128 
129 #ifdef __cplusplus
130  } /* End of extern "C" */
131 #endif /* __cplusplus */
132 
133 #undef PTE_LEVEL
134 #undef PTE_LEVEL_MAX
135 
136 #endif /* !_SCHED_H */
137 
Definition: sched.h:90
Definition: sched.h:97
Definition: sched.h:93
int sched_get_priority_min(int policy)
Definition: sched.c:92
Definition: sched.h:91
int sched_get_priority_max(int policy)
Definition: sched.c:98
Definition: sched.h:92
int sched_yield(void)
Definition: sched.c:60
int pid_t
Definition: pte_types.h:10
int sched_setscheduler(pid_t pid, int policy)
Definition: sched.c:53
int sched_priority
Definition: sched.h:99
Definition: sched.h:94