sched.h
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上传日期:2022-01-26
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文件大小:5k
- /*
- * Module: sched.h
- *
- * Purpose:
- * Provides an implementation of POSIX realtime extensions
- * as defined in
- *
- * POSIX 1003.1b-1993 (POSIX.1b)
- *
- * --------------------------------------------------------------------------
- *
- * Pthreads-win32 - POSIX Threads Library for Win32
- * Copyright(C) 1998 John E. Bossom
- * Copyright(C) 1999,2003 Pthreads-win32 contributors
- *
- * Contact Email: rpj@callisto.canberra.edu.au
- *
- * The current list of contributors is contained
- * in the file CONTRIBUTORS included with the source
- * code distribution. The list can also be seen at the
- * following World Wide Web location:
- * http://sources.redhat.com/pthreads-win32/contributors.html
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library in the file COPYING.LIB;
- * if not, write to the Free Software Foundation, Inc.,
- * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
- */
- #ifndef _SCHED_H
- #define _SCHED_H
- #undef PTW32_LEVEL
- #if defined(_POSIX_SOURCE)
- #define PTW32_LEVEL 0
- /* Early POSIX */
- #endif
- #if defined(_POSIX_C_SOURCE) && _POSIX_C_SOURCE >= 199309
- #undef PTW32_LEVEL
- #define PTW32_LEVEL 1
- /* Include 1b, 1c and 1d */
- #endif
- #if defined(INCLUDE_NP)
- #undef PTW32_LEVEL
- #define PTW32_LEVEL 2
- /* Include Non-Portable extensions */
- #endif
- #define PTW32_LEVEL_MAX 3
- #if !defined(PTW32_LEVEL)
- #define PTW32_LEVEL PTW32_LEVEL_MAX
- /* Include everything */
- #endif
- #if __GNUC__ && ! defined (__declspec)
- # error Please upgrade your GNU compiler to one that supports __declspec.
- #endif
- /*
- * When building the DLL code, you should define PTW32_BUILD so that
- * the variables/functions are exported correctly. When using the DLL,
- * do NOT define PTW32_BUILD, and then the variables/functions will
- * be imported correctly.
- */
- #ifdef PTW32_BUILD
- # define PTW32_DLLPORT __declspec (dllexport)
- #else
- # define PTW32_DLLPORT __declspec (dllimport)
- #endif
- /*
- * This is a duplicate of what is in the autoconf config.h,
- * which is only used when building the pthread-win32 libraries.
- */
- #ifndef PTW32_CONFIG_H
- # if defined(WINCE)
- # define NEED_ERRNO
- # define NEED_SEM
- # endif
- # if defined(_UWIN) || defined(__MINGW32__)
- # define HAVE_MODE_T
- # endif
- #endif
- /*
- *
- */
- #if PTW32_LEVEL >= PTW32_LEVEL_MAX
- #ifdef NEED_ERRNO
- #include "need_errno.h"
- #else
- #include <errno.h>
- #endif
- #endif /* PTW32_LEVEL >= PTW32_LEVEL_MAX */
- #if defined(__MINGW32__) || defined(_UWIN)
- #if PTW32_LEVEL >= PTW32_LEVEL_MAX
- /* For pid_t */
- # include <sys/types.h>
- /* Required by Unix 98 */
- # include <time.h>
- #endif /* PTW32_LEVEL >= PTW32_LEVEL_MAX */
- #else
- typedef int pid_t;
- #endif
- /* Thread scheduling policies */
- enum {
- SCHED_OTHER = 0,
- SCHED_FIFO,
- SCHED_RR,
- SCHED_MIN = SCHED_OTHER,
- SCHED_MAX = SCHED_RR
- };
- struct sched_param {
- int sched_priority;
- };
- #ifdef __cplusplus
- extern "C"
- {
- #endif /* __cplusplus */
- PTW32_DLLPORT int sched_yield (void);
- PTW32_DLLPORT int sched_get_priority_min (int policy);
- PTW32_DLLPORT int sched_get_priority_max (int policy);
- PTW32_DLLPORT int sched_setscheduler (pid_t pid, int policy);
- PTW32_DLLPORT int sched_getscheduler (pid_t pid);
- /*
- * Note that this macro returns ENOTSUP rather than
- * ENOSYS as might be expected. However, returning ENOSYS
- * should mean that sched_get_priority_{min,max} are
- * not implemented as well as sched_rr_get_interval.
- * This is not the case, since we just don't support
- * round-robin scheduling. Therefore I have chosen to
- * return the same value as sched_setscheduler when
- * SCHED_RR is passed to it.
- */
- #define sched_rr_get_interval(_pid, _interval)
- ( errno = ENOTSUP, (int) -1 )
- #ifdef __cplusplus
- } /* End of extern "C" */
- #endif /* __cplusplus */
- #undef PTW32_LEVEL
- #undef PTW32_LEVEL_MAX
- #endif /* !_SCHED_H */