Add missing files.
This commit is contained in:
Christopher Faylor
parent
9a08b2c02e
commit
6b2a2aa4af
53
winsup/cygwin/include/sched.h
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53
winsup/cygwin/include/sched.h
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/* sched.h: scheduler interface for Cygwin
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Copyright 2001 Red Hat, Inc.
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Written by Robert Collins <rbtcollins@hotmail.com>
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This file is part of Cygwin.
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This software is a copyrighted work licensed under the terms of the
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Cygwin license. Please consult the file "CYGWIN_LICENSE" for
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details. */
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/* Written from the opengroup specifications */
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#ifndef _SCHED_H
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#define _SCHED_H
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#include <time.h>
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/* we return -1 and set errno on failure */
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#define SCHED_FIFO 1
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#define SCHED_RR 2
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#define SCHED_OTHER 3
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struct sched_param
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{
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int sched_priority;
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};
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* max priority for policy */
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int sched_get_priority_max (int);
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/* min priority for policy */
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int sched_get_priority_min (int);
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/* get sched params for process */
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int sched_getparam (pid_t, struct sched_param *);
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/* get the scheduler for pid */
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int sched_getscheduler (pid_t);
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/* get the time quantum for pid */
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int sched_rr_get_interval (pid_t, struct timespec *);
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/* set the scheduling parameters */
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int sched_setparam (pid_t, const struct sched_param *);
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/* set the scheduler */
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int sched_setscheduler (pid_t, int, const struct sched_param *);
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/* yield the cpu */
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int sched_yield (void);
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#ifdef __cplusplus
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}
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#endif
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#endif /* _SCHED_H */
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404
winsup/cygwin/sched.cc
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404
winsup/cygwin/sched.cc
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/* sched.cc: scheduler interface for Cygwin
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Copyright 2001 Red Hat, Inc.
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Written by Robert Collins <rbtcollins@hotmail.com>
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This file is part of Cygwin.
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This software is a copyrighted work licensed under the terms of the
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Cygwin license. Please consult the file "CYGWIN_LICENSE" for
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details. */
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include "winsup.h"
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#include <limits.h>
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#include <errno.h>
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#include "cygerrno.h"
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#include <assert.h>
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#include <stdlib.h>
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#include <syslog.h>
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#include <sched.h>
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#include "sigproc.h"
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#include "pinfo.h"
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/* for getpid */
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#include <unistd.h>
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/* Win32 priority to UNIX priority Mapping.
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For now, I'm just following the spec: any range of priorities is ok.
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There are probably many many issues with this...
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We don't want process's going realtime. Well, they probably could, but the issues
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with avoiding the priority values 17-22 and 27-30 (not supported before win2k)
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make that inefficient.
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However to complicate things most unixes use lower is better priorities.
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So we map -14 to 15, and 15 to 1 via (16- ((n+16) >> 1))
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we then map 1 to 15 to various process class and thread priority combinations
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Then we need to look at the threads vi process priority. As win95 98 and NT 4
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Don't support opening threads cross-process (unless a thread HANDLE is passed around)
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for now, we'll just use the priority class.
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The code and logic are present to calculate the priority for thread
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, if a thread handle can be obtained. Alternatively, if the symbols wouldn't be
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resolved until they are used
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we could support this on windows 2000 and ME now, and just fall back to the
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class only on pre win2000 machines.
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Lastly, because we can't assume that the pid we're given are Windows pids, we can't
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alter non-cygwin started programs.
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*/
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extern "C"
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{
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/* max priority for policy */
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int
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sched_get_priority_max (int policy)
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{
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if (policy < 1 || policy > 3)
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{
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set_errno (EINVAL);
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return -1;
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}
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return -14;
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}
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/* min priority for policy */
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int
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sched_get_priority_min (int policy)
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{
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if (policy < 1 || policy > 3)
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{
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set_errno (EINVAL);
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return -1;
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}
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return 15;
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}
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/* get sched params for process
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Note, I'm never returning EPERM,
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Always ESRCH. This is by design (If cygwin ever looks at paranoid security
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Walking the pid values is a known hole in some os's)
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*/
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int
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sched_getparam (pid_t pid, struct sched_param *param)
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{
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pid_t localpid;
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int winpri;
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if (!param || pid < 0)
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{
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set_errno (EINVAL);
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return -1;
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}
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localpid = pid ? pid : getpid ();
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DWORD Class;
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int ThreadPriority;
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HANDLE process;
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pinfo p (localpid);
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/* get the class */
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if (!p)
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{
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set_errno (ESRCH);
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return -1;
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}
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process = OpenProcess (PROCESS_QUERY_INFORMATION, FALSE, p->dwProcessId);
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if (!process)
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{
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set_errno (ESRCH);
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return -1;
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}
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Class = GetPriorityClass (process);
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CloseHandle (process);
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if (!Class)
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{
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set_errno (ESRCH);
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return -1;
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}
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ThreadPriority = THREAD_PRIORITY_NORMAL;
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/* calculate the unix priority.
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FIXME: windows 2000 supports ABOVE_NORMAL and BELOW_NORMAL class's
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So this logic just defaults those class factors to NORMAL in the calculations */
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switch (Class)
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{
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case IDLE_PRIORITY_CLASS:
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switch (ThreadPriority)
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{
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case THREAD_PRIORITY_IDLE:
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winpri = 1;
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break;
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case THREAD_PRIORITY_LOWEST:
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winpri = 2;
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break;
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case THREAD_PRIORITY_BELOW_NORMAL:
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winpri = 3;
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break;
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case THREAD_PRIORITY_NORMAL:
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winpri = 4;
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break;
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case THREAD_PRIORITY_ABOVE_NORMAL:
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winpri = 5;
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break;
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case THREAD_PRIORITY_HIGHEST:
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default:
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winpri = 6;
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break;
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}
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break;
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case HIGH_PRIORITY_CLASS:
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switch (ThreadPriority)
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{
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case THREAD_PRIORITY_IDLE:
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winpri = 1;
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break;
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case THREAD_PRIORITY_LOWEST:
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winpri = 11;
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break;
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case THREAD_PRIORITY_BELOW_NORMAL:
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winpri = 12;
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break;
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case THREAD_PRIORITY_NORMAL:
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winpri = 13;
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break;
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case THREAD_PRIORITY_ABOVE_NORMAL:
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winpri = 14;
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break;
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case THREAD_PRIORITY_HIGHEST:
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default:
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winpri = 15;
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break;
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}
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break;
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case NORMAL_PRIORITY_CLASS:
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default:
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switch (ThreadPriority)
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{
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case THREAD_PRIORITY_IDLE:
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winpri = 1;
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break;
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case THREAD_PRIORITY_LOWEST:
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winpri = 7;
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break;
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case THREAD_PRIORITY_BELOW_NORMAL:
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winpri = 8;
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break;
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case THREAD_PRIORITY_NORMAL:
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winpri = 9;
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break;
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case THREAD_PRIORITY_ABOVE_NORMAL:
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winpri = 10;
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break;
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case THREAD_PRIORITY_HIGHEST:
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default:
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winpri = 11;
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break;
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}
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break;
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}
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/* reverse out winpri = (16- ((unixpri+16) >> 1)) */
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/*
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winpri-16 = - (unixpri +16 ) >> 1
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-(winpri-16) = unixpri +16 >> 1
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(-(winpri-16)) << 1 = unixpri+16
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((-(winpri - 16)) << 1) - 16 = unixpri
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*/
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param->sched_priority = ((-(winpri - 16)) << 1) - 16;
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return 0;
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}
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/* get the scheduler for pid
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All process's on WIN32 run with SCHED_FIFO.
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So we just give an answer.
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(WIN32 uses a multi queue FIFO).
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*/
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int
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sched_getscheduler (pid_t pid)
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{
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if (pid < 0)
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return ESRCH;
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else
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return SCHED_FIFO;
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}
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/* get the time quantum for pid
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We can't return -11, errno ENOSYS, because that implies that
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sched_get_priority_max & min are also not supported (according to the spec)
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so some spec-driven autoconf tests will likely assume they aren't present either
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returning ESRCH might confuse some applications (if they assumed that when
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rr_get_interval is called on pid 0 it always works).
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If someone knows the time quanta for the various win32 platforms, then a
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simple check for the os we're running on will finish this function
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*/
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int
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sched_rr_get_interval (pid_t pid, struct timespec *interval)
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{
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set_errno (ESRCH);
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return -1;
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}
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/* set the scheduling parameters */
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int
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sched_setparam (pid_t pid, const struct sched_param *param)
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{
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pid_t localpid;
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int winpri;
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DWORD Class;
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int ThreadPriority;
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HANDLE process;
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if (!param || pid < 0)
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{
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set_errno (EINVAL);
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return -1;
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}
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if (param->sched_priority < -14 || param->sched_priority > 15)
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{
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set_errno (EINVAL);
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return -1;
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}
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/* winpri = (16- ((unixpri+16) >> 1)) */
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winpri = 16 - ((param->sched_priority + 16) >> 1);
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/* calculate our desired priority class and thread priority */
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if (winpri < 7)
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Class = IDLE_PRIORITY_CLASS;
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else if (winpri > 10)
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Class = HIGH_PRIORITY_CLASS;
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else
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Class = NORMAL_PRIORITY_CLASS;
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switch (Class)
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{
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case IDLE_PRIORITY_CLASS:
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switch (winpri)
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{
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case 1:
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ThreadPriority = THREAD_PRIORITY_IDLE;
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break;
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case 2:
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ThreadPriority = THREAD_PRIORITY_LOWEST;
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break;
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case 3:
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ThreadPriority = THREAD_PRIORITY_BELOW_NORMAL;
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break;
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case 4:
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ThreadPriority = THREAD_PRIORITY_NORMAL;
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break;
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case 5:
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ThreadPriority = THREAD_PRIORITY_ABOVE_NORMAL;
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break;
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case 6:
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ThreadPriority = THREAD_PRIORITY_HIGHEST;
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break;
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}
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break;
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case NORMAL_PRIORITY_CLASS:
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switch (winpri)
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{
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case 7:
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ThreadPriority = THREAD_PRIORITY_LOWEST;
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break;
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case 8:
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ThreadPriority = THREAD_PRIORITY_BELOW_NORMAL;
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break;
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case 9:
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ThreadPriority = THREAD_PRIORITY_NORMAL;
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break;
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case 10:
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ThreadPriority = THREAD_PRIORITY_ABOVE_NORMAL;
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break;
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case 11:
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ThreadPriority = THREAD_PRIORITY_HIGHEST;
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break;
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}
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break;
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case HIGH_PRIORITY_CLASS:
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switch (winpri)
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{
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case 12:
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ThreadPriority = THREAD_PRIORITY_BELOW_NORMAL;
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break;
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case 13:
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ThreadPriority = THREAD_PRIORITY_NORMAL;
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break;
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case 14:
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ThreadPriority = THREAD_PRIORITY_ABOVE_NORMAL;
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break;
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case 15:
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ThreadPriority = THREAD_PRIORITY_HIGHEST;
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break;
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}
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break;
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}
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localpid = pid ? pid : getpid ();
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pinfo p (localpid);
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/* set the class */
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if (!p)
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{
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set_errno (1); //ESRCH);
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return -1;
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}
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process =
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OpenProcess (PROCESS_SET_INFORMATION, FALSE, (DWORD) p->dwProcessId);
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if (!process)
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{
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set_errno (2); //ESRCH);
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return -1;
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}
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if (!SetPriorityClass (process, Class))
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{
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CloseHandle (process);
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set_errno (EPERM);
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return -1;
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}
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CloseHandle (process);
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return 0;
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}
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/* set the scheduler */
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int
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sched_setscheduler (pid_t pid, int policy,
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const struct sched_param *param)
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{
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/* on win32, you can't change the scheduler. Doh! */
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set_errno (ENOSYS);
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return -1;
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}
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/* yield the cpu */
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int
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sched_yield (void)
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{
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Sleep (0);
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return 0;
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}
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}
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