mingw/include/sched.h

   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 */
 178