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Re: Implementation of sched_rr_get_interval for NT systems.
- From: Vaclav Haisman <V dot Haisman at sh dot cvut dot cz>
- To: cygwin-patches at cygwin dot com
- Date: Thu, 6 Feb 2003 13:16:17 +0100 (CET)
- Subject: Re: Implementation of sched_rr_get_interval for NT systems.
Huh, I really don't know why I typed -c instead of -u. This is the same patch
with addition of error checking on registry access as suggested by Robert
Collins. Now with the right diff options. I am working on submitting the
assignment too.
Vaclav Haisman
> You're not wrong and it does matter.
>
> I will give this function more inspection later, but for the future please
> submit using the options that Igor specified.
>
> Robert is right that you do need an assignment, too. This is adding new
> functionality.
>
> Thanks for the patch and sorry for the rules. :-)
>
> cgf
>
2003-02-06 Vaclav Haisman <V.Haisman@sh.cvut.cz>
* Makefile.in: Add libusr32.a to DLL_IMPORTS.
* wincap.h (wincaps::is_server): New flag.
(wincapc::version): Change type to OSVERSIONINFOEX.
(wincapc::is_server): New function.
* wincap.cc (wincap_unknown::is_server): New initializer.
(wincap_95): Ditto.
(wincap_95osr2): Ditto.
(wincap_98): Ditto.
(wincap_me): Ditto.
(wincap_nt3): Ditto.
(wincap_nt4): Ditto.
(wincap_nt4sp4): Ditto.
(wincap_2000): Ditto.
(wincap_xp): Ditto.
(wincapc::init): Adapt to OSVERSIONINFOEX. Add detection of NT
server systems.
* sched.cc: Include windows.h and registry.h.
(sched_rr_get_interval): Re-implement for NT systems.
Index: cygwin/Makefile.in
===================================================================
RCS file: /cvs/src/src/winsup/cygwin/Makefile.in,v
retrieving revision 1.114
diff -u -p -r1.114 Makefile.in
--- cygwin/Makefile.in 24 Jan 2003 03:53:46 -0000 1.114
+++ cygwin/Makefile.in 6 Feb 2003 12:06:57 -0000
@@ -141,7 +141,7 @@ EXTRA_OFILES=$(bupdir1)/libiberty/random
MALLOC_OFILES=@MALLOC_OFILES@
-DLL_IMPORTS:=$(w32api_lib)/libkernel32.a
+DLL_IMPORTS:=$(w32api_lib)/libkernel32.a $(w32api_lib)/libuser32.a
# Please maintain this list in sorted order, with maximum files per 80 col line
DLL_OFILES:=assert.o autoload.o cxx.o cygheap.o cygserver_client.o \
Index: cygwin/wincap.h
===================================================================
RCS file: /cvs/src/src/winsup/cygwin/wincap.h,v
retrieving revision 1.14
diff -u -p -r1.14 wincap.h
--- cygwin/wincap.h 15 Oct 2002 17:04:20 -0000 1.14
+++ cygwin/wincap.h 6 Feb 2003 12:06:57 -0000
@@ -17,6 +17,7 @@ struct wincaps
DWORD chunksize;
int shared;
unsigned is_winnt : 1;
+ unsigned is_server : 1;
unsigned access_denied_on_delete : 1;
unsigned has_delete_on_close : 1;
unsigned has_page_guard : 1;
@@ -53,9 +54,9 @@ struct wincaps
class wincapc
{
- OSVERSIONINFO version;
- char osnam[40];
- void *caps;
+ OSVERSIONINFOEX version;
+ char osnam[40];
+ void *caps;
public:
void init ();
@@ -70,6 +71,7 @@ public:
DWORD IMPLEMENT (chunksize)
int IMPLEMENT (shared)
bool IMPLEMENT (is_winnt)
+ bool IMPLEMENT (is_server)
bool IMPLEMENT (access_denied_on_delete)
bool IMPLEMENT (has_delete_on_close)
bool IMPLEMENT (has_page_guard)
Index: cygwin/wincap.cc
===================================================================
RCS file: /cvs/src/src/winsup/cygwin/wincap.cc,v
retrieving revision 1.18
diff -u -p -r1.18 wincap.cc
--- cygwin/wincap.cc 15 Oct 2002 17:04:20 -0000 1.18
+++ cygwin/wincap.cc 6 Feb 2003 12:07:02 -0000
@@ -16,6 +16,7 @@ static NO_COPY wincaps wincap_unknown =
chunksize:0x0,
shared:FILE_SHARE_READ | FILE_SHARE_WRITE,
is_winnt:false,
+ is_server:false,
access_denied_on_delete:false,
has_delete_on_close:false,
has_page_guard:false,
@@ -55,6 +56,7 @@ static NO_COPY wincaps wincap_95 = {
chunksize:32 * 1024 * 1024,
shared:FILE_SHARE_READ | FILE_SHARE_WRITE,
is_winnt:false,
+ is_server:false,
access_denied_on_delete:true,
has_delete_on_close:false,
has_page_guard:false,
@@ -94,6 +96,7 @@ static NO_COPY wincaps wincap_95osr2 = {
chunksize:32 * 1024 * 1024,
shared:FILE_SHARE_READ | FILE_SHARE_WRITE,
is_winnt:false,
+ is_server:false,
access_denied_on_delete:true,
has_delete_on_close:false,
has_page_guard:false,
@@ -133,6 +136,7 @@ static NO_COPY wincaps wincap_98 = {
chunksize:32 * 1024 * 1024,
shared:FILE_SHARE_READ | FILE_SHARE_WRITE,
is_winnt:false,
+ is_server:false,
access_denied_on_delete:true,
has_delete_on_close:false,
has_page_guard:false,
@@ -172,6 +176,7 @@ static NO_COPY wincaps wincap_98se = {
chunksize:32 * 1024 * 1024,
shared:FILE_SHARE_READ | FILE_SHARE_WRITE,
is_winnt:false,
+ is_server:false,
access_denied_on_delete:true,
has_delete_on_close:false,
has_page_guard:false,
@@ -211,6 +216,7 @@ static NO_COPY wincaps wincap_me = {
chunksize:32 * 1024 * 1024,
shared:FILE_SHARE_READ | FILE_SHARE_WRITE,
is_winnt:false,
+ is_server:false,
access_denied_on_delete:true,
has_delete_on_close:false,
has_page_guard:false,
@@ -250,6 +256,7 @@ static NO_COPY wincaps wincap_nt3 = {
chunksize:0,
shared:FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE,
is_winnt:true,
+ is_server:false,
access_denied_on_delete:false,
has_delete_on_close:true,
has_page_guard:true,
@@ -289,6 +296,7 @@ static NO_COPY wincaps wincap_nt4 = {
chunksize:0,
shared:FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE,
is_winnt:true,
+ is_server:false,
access_denied_on_delete:false,
has_delete_on_close:true,
has_page_guard:true,
@@ -328,6 +336,7 @@ static NO_COPY wincaps wincap_nt4sp4 = {
chunksize:0,
shared:FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE,
is_winnt:true,
+ is_server:false,
access_denied_on_delete:false,
has_delete_on_close:true,
has_page_guard:true,
@@ -367,6 +376,7 @@ static NO_COPY wincaps wincap_2000 = {
chunksize:0,
shared:FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE,
is_winnt:true,
+ is_server:false,
access_denied_on_delete:false,
has_delete_on_close:true,
has_page_guard:true,
@@ -406,6 +416,7 @@ static NO_COPY wincaps wincap_xp = {
chunksize:0,
shared:FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE,
is_winnt:true,
+ is_server:false,
access_denied_on_delete:false,
has_delete_on_close:true,
has_page_guard:true,
@@ -451,8 +462,8 @@ wincapc::init ()
return; // already initialized
memset (&version, 0, sizeof version);
- version.dwOSVersionInfoSize = sizeof version;
- GetVersionEx (&version);
+ version.dwOSVersionInfoSize = sizeof (OSVERSIONINFO);
+ GetVersionEx (reinterpret_cast<LPOSVERSIONINFO>(&version));
switch (version.dwPlatformId)
{
@@ -515,6 +526,15 @@ wincapc::init ()
caps = &wincap_unknown;
break;
}
+
+ if (((wincaps *)this->caps)->is_winnt && version.dwMajorVersion > 4)
+ {
+ version.dwOSVersionInfoSize = sizeof version;
+ GetVersionEx (reinterpret_cast<LPOSVERSIONINFO>(&version));
+ if (version.wProductType != VER_NT_WORKSTATION)
+ ((wincaps *)this->caps)->is_server = true;
+ }
+
__small_sprintf (osnam, "%s-%d.%d", os, version.dwMajorVersion,
version.dwMinorVersion);
}
Index: cygwin/sched.cc
===================================================================
RCS file: /cvs/src/src/winsup/cygwin/sched.cc,v
retrieving revision 1.7
diff -u -p -r1.7 sched.cc
--- cygwin/sched.cc 13 Nov 2002 19:36:12 -0000 1.7
+++ cygwin/sched.cc 6 Feb 2003 12:07:03 -0000
@@ -14,6 +14,7 @@
# include "config.h"
#endif
+#include <windows.h>
#include "winsup.h"
#include <limits.h>
#include <errno.h>
@@ -25,6 +26,8 @@
#include "pinfo.h"
/* for getpid */
#include <unistd.h>
+#include "registry.h"
+
/* Win32 priority to UNIX priority Mapping.
For now, I'm just following the spec: any range of priorities is ok.
@@ -249,22 +252,76 @@ sched_getscheduler (pid_t pid)
}
/* get the time quantum for pid
-
- We can't return -11, errno ENOSYS, because that implies that
- sched_get_priority_max & min are also not supported (according to the spec)
- so some spec-driven autoconf tests will likely assume they aren't present either
-
- returning ESRCH might confuse some applications (if they assumed that when
- rr_get_interval is called on pid 0 it always works).
-
- If someone knows the time quanta for the various win32 platforms, then a
- simple check for the os we're running on will finish this function
+
+ Implemented only for NT systems, it fails and sets errno to ESRCH
+ for non-NT systems.
*/
int
sched_rr_get_interval (pid_t pid, struct timespec *interval)
{
- set_errno (ESRCH);
- return -1;
+ static const char quantable[2][2][3] =
+ {{{12, 24, 36}, { 6, 12, 18}},
+ {{36, 36, 36}, {18, 18, 18}}};
+ /* FIXME: Clocktickinterval can be 15 ms for multi-processor system. */
+ static const int clocktickinterval = 10;
+ static const int quantapertick = 3;
+
+ HWND forwin;
+ DWORD forprocid;
+ int vfindex, slindex, qindex, prisep;
+ long nsec;
+
+ if (!wincap.is_winnt ())
+ {
+ set_errno (ESRCH);
+ return -1;
+ }
+
+ forwin = GetForegroundWindow ();
+ if (!forwin)
+ GetWindowThreadProcessId (forwin, &forprocid);
+ else
+ forprocid = 0;
+
+ reg_key reg (HKEY_LOCAL_MACHINE, KEY_READ, "SYSTEM", "CurrentControlSet",
+ "Control", "PriorityControl", NULL);
+ if (reg.error ())
+ {
+ set_errno (ESRCH);
+ return -1;
+ }
+ prisep = reg.get_int ("Win32PrioritySeparation", 2);
+ pinfo pi (pid ? pid : myself->pid);
+ if (!pi)
+ {
+ set_errno (ESRCH);
+ return -1;
+ }
+
+ if (pi->dwProcessId == forprocid)
+ {
+ qindex = prisep & 3;
+ qindex = qindex == 3 ? 2 : qindex;
+ }
+ else
+ qindex = 0;
+ vfindex = ((prisep >> 2) & 3) % 3;
+ if (vfindex == 0)
+ vfindex = wincap.is_server () || prisep & 3 == 0 ? 1 : 0;
+ else
+ vfindex -= 1;
+ slindex = ((prisep >> 4) & 3) % 3;
+ if (slindex == 0)
+ slindex = wincap.is_server () ? 1 : 0;
+ else
+ slindex -= 1;
+
+ nsec = quantable[vfindex][slindex][qindex] / quantapertick
+ * clocktickinterval * 1000000;
+ interval->tv_sec = nsec / 1000000000;
+ interval->tv_nsec = nsec % 1000000000;
+
+ return 0;
}
/* set the scheduling parameters */