select() ignoring timeval argument

[1inmillion]

Hi,

I am new to this thread.

I am using select() in my code.

my code snippet:

---------------------

twait.tv_sec = 0;

twait.tv_usec = THIRTY_MILLISECONDS;

pollfds2_count = select (0, readfds, writefds,exceptfds, &twait);

From one of the support forums i came to know that select() will return immediately even timeval parameter set to "non zero" or non NULL values. Am i correct? (They mentioned a possible bug in windows).

For our application to work correctly select should wait for THIRTY_MILLISECONDS.

How can i ensure that?

How sleep will help?

Please help me.

Regards,

Naga

[ɹəuəllıʍ ʇɐb]

I don't know select(), or how it works internally.

What is the value of THIRTY_MILLISECONDS ?

[1inmillion]

I don't know select(), or how it works internally.

What is the value of THIRTY_MILLISECONDS ?

Hi,

Thanks for looking it.

I ahve the value for THIRTY_MILLISECONDS as follows.

#define THIRTY_MILLISECONDS 30000

Regards,

Naga

[ɹəuəllıʍ ʇɐb]

OK, that sounds right.

Now my question - do you actually know that select() is not waiting out your 30 ms, or do you just suspect it?

Can you take a timestamp before and after the select(), and see how much time has actually elapsed?

Maybe do another select() with twait.tv_usec = 0 (with a timestamp before and after), and see if there is a difference to the other select()?

[1inmillion]

Hi,

Thanks.

I am just suspecting it.

My application dumped core at customer site. drwatson.log made me to suspect select() call.

After looking the following forum I strongly suspected that the select timeout not working properly.

http://www.suacommunity.com/forum/tm.aspx?m=8335

As configuring my application to run is very complex, I postponed analysing exact time elapsed before select() returns.

I attached drwatson.log. If you could see any other cause that also very usefull.

I don't have dump file to analyse.

drwatson.log:

-----------------

{\rtf1\ansi\ansicpg1252\deff0\deflang1033{\fonttbl{\f0\fswiss\fcharset0 Arial;}}

{\*\generator Msftedit 5.41.15.1515;}\viewkind4\uc1\pard\f0\fs20 Application exception occurred:\par

App: R:\\usr\\sbin\\lde\\lde.exe (pid=1728)\par

When: 1/17/2009 @ 07:05:04.482\par

Exception number: c0000024 \par

()\par

\par

*----> System Information <----*\par

Computer Name: ETWK-PVLDEV02\par

User Name: SYSTEM\par

Terminal Session Id: 0\par

Number of Processors: 2\par

Processor Type: x86 Family 6 Model 23 Stepping 8\par

Windows Version: 5.2\par

Current Build: 3790\par

Service Pack: 2\par

Current Type: Multiprocessor Free\par

Registered Organization: \par

Registered Owner: Raytheon IDS\par

\par

*----> Task List <----*\par

0 System Process\par

4 System\par

440 smss.exe\par

488 csrss.exe\par

512 winlogon.exe\par

560 services.exe\par

572 lsass.exe\par

728 vmacthlp.exe\par

768 svchost.exe\par

832 svchost.exe\par

900 svchost.exe\par

916 svchost.exe\par

956 svchost.exe\par

1012 ccSetMgr.exe\par

1044 ccEvtMgr.exe\par

1152 SPBBCSvc.exe\par

1316 spoolsv.exe\par

1344 msdtc.exe\par

1452 MHAdminServerMgr.exe\par

1472 MHMapDriveServerMgr.exe\par

1512 MHServerMgr.exe\par

1544 bbnt.exe\par

1564 DefWatch.exe\par

1616 EPAService.exe\par

1648 EPMService.exe\par

1692 epm.exe\par

1708 javaw.exe\par

1728 lde.exe\par

1736 svchost.exe\par

1768 gservice.exe\par

1808 nsrexecd.exe\par

1840 nsrpm.exe\par

1868 svchost.exe\par

1880 SavRoam.exe\par

1976 snmp.exe\par

1988 Rtvscan.exe\par

2064 VMwareService.exe\par

2376 dllhost.exe\par

2568 wmiprvse.exe\par

2772 svchost.exe\par

3392 wmiprvse.exe\par

3852 logon.scr\par

1660 drwtsn32.exe\par

\par

*----> Module List <----*\par

0000000000320000 - 00000000003ae000: C:\\WINDOWS\\system32\\liblm3.2.dll\par

00000000003b0000 - 00000000003be000: C:\\WINDOWS\\system32\\libccm.dll\par

0000000000400000 - 0000000000579000: R:\\usr\\sbin\\lde\\lde.exe\par

0000000010000000 - 0000000010026000: C:\\WINDOWS\\system32\\LIBSSL3.dll\par

000000005f270000 - 000000005f2ca000: C:\\WINDOWS\\system32\\hnetcfg.dll\par

000000006ff00000 - 000000006ff07000: C:\\WINDOWS\\system32\\MHServLib.dll\par

0000000071ae0000 - 0000000071ae8000: C:\\WINDOWS\\System32\\wshtcpip.dll\par

0000000071b20000 - 0000000071b61000: C:\\WINDOWS\\System32\\mswsock.dll\par

0000000071bb0000 - 0000000071bb9000: C:\\WINDOWS\\system32\\WSOCK32.dll\par

0000000071bf0000 - 0000000071bf8000: C:\\WINDOWS\\system32\\WS2HELP.dll\par

0000000071c00000 - 0000000071c17000: C:\\WINDOWS\\system32\\WS2_32.dll\par

0000000071c40000 - 0000000071c97000: C:\\WINDOWS\\system32\\NETAPI32.dll\par

0000000076ed0000 - 0000000076efa000: C:\\WINDOWS\\system32\\DNSAPI.dll\par

0000000076f10000 - 0000000076f3e000: C:\\WINDOWS\\system32\\WLDAP32.dll\par

0000000076f50000 - 0000000076f63000: C:\\WINDOWS\\system32\\Secur32.dll\par

0000000076f70000 - 0000000076f77000: C:\\WINDOWS\\System32\\winrnr.dll\par

0000000076f80000 - 0000000076f85000: C:\\WINDOWS\\system32\\rasadhlp.dll\par

0000000077380000 - 0000000077411000: C:\\WINDOWS\\system32\\USER32.dll\par

0000000077b90000 - 0000000077b98000: C:\\WINDOWS\\system32\\VERSION.dll\par

0000000077ba0000 - 0000000077bfa000: C:\\WINDOWS\\system32\\MSVCRT.dll\par

0000000077c00000 - 0000000077c49000: C:\\WINDOWS\\system32\\GDI32.dll\par

0000000077c50000 - 0000000077cef000: C:\\WINDOWS\\system32\\RPCRT4.dll\par

0000000077e40000 - 0000000077f42000: C:\\WINDOWS\\system32\\kernel32.dll\par

0000000077f50000 - 0000000077feb000: C:\\WINDOWS\\system32\\ADVAPI32.dll\par

000000007c800000 - 000000007c8c0000: C:\\WINDOWS\\system32\\ntdll.dll\par

\par

*----> State Dump for Thread Id 0x6c4 <----*\par

\par

eax=4971c96d ebx=001455e0 ecx=00000000 edx=0056e258 esi=7fffffff edi=ffffffff\par

eip=7c8285ec esp=0012fb74 ebp=0012fbb0 iopl=0 nv up ei ng nz ac po cy\par

cs=001b ss=0023 ds=0023 es=0023 fs=003b gs=0000 efl=00000297\par

\par

*** ERROR: Symbol file could not be found. Defaulted to export symbols for C:\\WINDOWS\\system32\\ntdll.dll - \par

function: ntdll!KiFastSystemCallRet\par

7c8285ce e82c000000 call ntdll!RtlRaiseException (7c8285ff)\par

7c8285d3 8b0424 mov eax,[esp]\par

7c8285d6 8be5 mov esp,ebp\par

7c8285d8 5d pop ebp\par

7c8285d9 c3 ret\par

7c8285da 8da42400000000 lea esp,[esp]\par

7c8285e1 8da42400000000 lea esp,[esp]\par

ntdll!KiFastSystemCall:\par

7c8285e8 8bd4 mov edx,esp\par

7c8285ea 0f34 sysenter\par

ntdll!KiFastSystemCallRet:\par

7c8285ec c3 ret\par

7c8285ed 8da42400000000 lea esp,[esp]\par

7c8285f4 8d642400 lea esp,[esp]\par

ntdll!KiIntSystemCall:\par

7c8285f8 8d542408 lea edx,[esp+0x8]\par

7c8285fc cd2e int 2e\par

7c8285fe c3 ret\par

ntdll!RtlRaiseException:\par

7c8285ff 55 push ebp\par

7c828600 8bec mov ebp,esp\par

7c828602 8da42430fdffff lea esp,[esp-0x2d0]\par

\par

*----> Stack Back Trace <----*\par

*** ERROR: Symbol file could not be found. Defaulted to export symbols for C:\\WINDOWS\\System32\\mswsock.dll - \par

*** ERROR: Symbol file could not be found. Defaulted to export symbols for C:\\WINDOWS\\system32\\WS2_32.dll - \par

*** ERROR: Symbol file could not be found. Defaulted to export symbols for C:\\WINDOWS\\system32\\kernel32.dll - \par

ChildEBP RetAddr Args to Child \par

WARNING: Stack unwind information not available. Following frames may be wrong.\par

0012fbb0 71b21a03 00000730 00000a68 01000000 ntdll!KiFastSystemCallRet\par

0012fca0 71c0283c 00000000 009756e0 009758f0 mswsock+0x1a03\par

0012fcf0 00402e69 00000000 009756e0 009758f0 WS2_32!select+0xa1\par

0012ff38 00401605 00000000 00000000 0012ffc0 lde!executeDaemon+0x1409 (FPO: [EBP 0x00000001] [0,136,4])\par

0012ff4c 004bca7d 00000003 00000000 003c2978 lde!main+0x605 (FPO: [EBP 0x0012ffc0] [3,0,4])\par

0012ffc0 77e6f23b 00000000 00000000 7ffd5000 lde!mainCRTStartup+0xe3\par

0012fff0 00000000 004bc99a 00000000 78746341 kernel32!ProcessIdToSessionId+0x209\par

\par

*----> Raw Stack Dump <----*\par

000000000012fb74 0b 7d 82 7c f5 1a b2 71 - 30 07 00 00 01 00 00 00 .\}.|...q0.......\par

000000000012fb84 9c fb 12 00 00 00 00 00 - 50 fc 12 00 40 fc 12 00 ........P...@...\par

000000000012fb94 05 7b f4 d4 9b 78 c9 01 - ff ff ff ff ff ff ff ff .\{...x..........\par

000000000012fba4 e0 55 14 00 5d 9e b3 71 - d6 da c0 71 a0 fc 12 00 .U..]..q...q....\par

000000000012fbb4 03 1a b2 71 30 07 00 00 - 68 0a 00 00 00 00 00 01 ...q0...h.......\par

000000000012fbc4 04 00 00 00 00 5b 97 00 - a8 65 7e 00 f0 58 97 00 .....[...e~..X..\par

000000000012fbd4 e0 55 14 00 00 00 00 00 - 00 00 00 00 00 00 00 00 .U..............\par

000000000012fbe4 c8 fb 12 00 00 00 00 00 - 00 00 00 00 03 00 00 00 ................\par

000000000012fbf4 34 00 00 00 d4 fc 12 00 - 00 00 00 00 ff ff ff ff 4...............\par

000000000012fc04 da 24 b2 71 e0 55 14 00 - ec 0a 00 00 00 00 00 00 .$.q.U..........\par

000000000012fc14 03 00 00 00 f0 58 97 00 - 74 fc 12 00 00 5b 97 00 .....X..t....[..\par

000000000012fc24 e0 56 97 00 00 00 00 00 - 40 fc 12 00 c0 7d 97 00 .V......@....\}..\par

000000000012fc34 00 00 00 00 b8 5c 7e 00 - 03 00 00 00 00 e6 8e e7 .....\\~.........\par

000000000012fc44 fd ff ff ff 03 00 00 00 - 00 fc 12 00 68 0a 00 00 ............h...\par

000000000012fc54 99 00 00 00 78 fc 12 00 - 8c 0a 00 00 99 00 00 00 ....x...........\par

000000000012fc64 00 20 00 00 98 0a 00 00 - 99 00 00 00 3e 0a 4b 00 . ..........>.K.\par

000000000012fc74 ec 0a 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 ................\par

000000000012fc84 a6 f8 00 00 c8 fb 12 00 - 10 15 bf 71 e0 fc 12 00 ...........q....\par

000000000012fc94 4f 65 b4 71 30 19 b2 71 - ff ff ff ff f0 fc 12 00 Oe.q0..q........\par

000000000012fca4 3c 28 c0 71 00 00 00 00 - e0 56 97 00 f0 58 97 00 <(.q.....V...X..\par

\par

*----> State Dump for Thread Id 0x7d8 <----*\par

\par

eax=71c5104d ebx=00000000 ecx=00000000 edx=00000000 esi=00000000 edi=7c826fbf\par

eip=7c8285ec esp=00a7ff8c ebp=00a7ffb8 iopl=0 nv up ei pl zr na po nc\par

cs=001b ss=0023 ds=0023 es=0023 fs=003b gs=0000 efl=00000246\par

\par

function: ntdll!KiFastSystemCallRet\par

7c8285ce e82c000000 call ntdll!RtlRaiseException (7c8285ff)\par

7c8285d3 8b0424 mov eax,[esp]\par

7c8285d6 8be5 mov esp,ebp\par

7c8285d8 5d pop ebp\par

7c8285d9 c3 ret\par

7c8285da 8da42400000000 lea esp,[esp]\par

7c8285e1 8da42400000000 lea esp,[esp]\par

ntdll!KiFastSystemCall:\par

7c8285e8 8bd4 mov edx,esp\par

7c8285ea 0f34 sysenter\par

ntdll!KiFastSystemCallRet:\par

7c8285ec c3 ret\par

7c8285ed 8da42400000000 lea esp,[esp]\par

7c8285f4 8d642400 lea esp,[esp]\par

ntdll!KiIntSystemCall:\par

7c8285f8 8d542408 lea edx,[esp+0x8]\par

7c8285fc cd2e int 2e\par

7c8285fe c3 ret\par

ntdll!RtlRaiseException:\par

7c8285ff 55 push ebp\par

7c828600 8bec mov ebp,esp\par

7c828602 8da42430fdffff lea esp,[esp-0x2d0]\par

\par

*----> Stack Back Trace <----*\par

ChildEBP RetAddr Args to Child \par

WARNING: Stack unwind information not available. Following frames may be wrong.\par

00a7ffb8 77e64829 00000000 00000000 00000000 ntdll!KiFastSystemCallRet\par

00a7ffec 00000000 71c5104d 00000000 00000000 kernel32!GetModuleHandleA+0xdf\par

\par

*----> Raw Stack Dump <----*\par

0000000000a7ff8c fb 7c 82 7c c0 10 c5 71 - 02 00 00 00 b0 ff a7 00 .|.|...q........\par

0000000000a7ff9c 01 00 00 00 01 00 00 00 - 00 00 00 00 00 00 00 00 ................\par

0000000000a7ffac 00 00 00 00 3c 01 00 00 - 38 01 00 00 ec ff a7 00 ....<...8.......\par

0000000000a7ffbc 29 48 e6 77 00 00 00 00 - 00 00 00 00 00 00 00 00 )H.w............\par

0000000000a7ffcc 00 00 00 00 00 00 00 00 - c4 ff a7 00 5d 06 85 80 ............]...\par

0000000000a7ffdc ff ff ff ff 60 1a e6 77 - 30 48 e6 77 00 00 00 00 ....`..w0H.w....\par

0000000000a7ffec 00 00 00 00 00 00 00 00 - 4d 10 c5 71 00 00 00 00 ........M..q....\par

0000000000a7fffc 00 00 00 00 00 00 b1 00 - 50 00 3c 00 00 00 00 00 ........P.<.....\par

0000000000a8000c 00 00 00 00 00 10 08 00 - 00 10 08 00 00 10 00 00 ................\par

0000000000a8001c 00 0b 00 00 01 00 00 00 - 00 00 00 00 00 00 00 00 ................\par

0000000000a8002c 00 00 00 00 00 00 00 00 - 00 00 08 00 74 ff 07 00 ............t...\par

0000000000a8003c 00 00 00 00 88 00 00 00 - 88 00 00 00 00 00 00 00 ................\par

0000000000a8004c 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 ................\par

0000000000a8005c f6 01 d6 01 00 00 00 00 - 00 00 00 00 00 00 00 00 ................\par

0000000000a8006c 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 ................\par

0000000000a8007c 44 0d 00 00 44 0d 00 00 - 44 0d 00 00 18 63 7f 8a D...D...D....c..\par

0000000000a8008c 18 63 7f 8a 18 63 7f 8a - 3f 3d 66 49 3f 3d 66 49 .c...c..?=fI?=fI\par

0000000000a8009c 3f 3d 66 49 04 00 00 00 - fc 1f 00 00 53 54 44 45 ?=fI........STDE\par

0000000000a800ac 78 ff 07 00 3f 3d 66 49 - 00 00 00 00 01 00 00 00 x...?=fI........\par

0000000000a800bc 00 40 00 00 a0 03 00 00 - f0 02 00 00 00 00 00 00 .@..............\par

\par

*----> State Dump for Thread Id 0x9e4 <----*\par

\par

eax=00000000 ebx=00000001 ecx=00000000 edx=00000000 esi=00000a74 edi=00000000\par

eip=7c8285ec esp=016bfecc ebp=016bff3c iopl=0 nv up ei ng nz ac po cy\par

cs=001b ss=0023 ds=0023 es=0023 fs=003b gs=0000 efl=00000297\par

\par

function: ntdll!KiFastSystemCallRet\par

7c8285ce e82c000000 call ntdll!RtlRaiseException (7c8285ff)\par

7c8285d3 8b0424 mov eax,[esp]\par

7c8285d6 8be5 mov esp,ebp\par

7c8285d8 5d pop ebp\par

7c8285d9 c3 ret\par

7c8285da 8da42400000000 lea esp,[esp]\par

7c8285e1 8da42400000000 lea esp,[esp]\par

ntdll!KiFastSystemCall:\par

7c8285e8 8bd4 mov edx,esp\par

7c8285ea 0f34 sysenter\par

ntdll!KiFastSystemCallRet:\par

7c8285ec c3 ret\par

7c8285ed 8da42400000000 lea esp,[esp]\par

7c8285f4 8d642400 lea esp,[esp]\par

ntdll!KiIntSystemCall:\par

7c8285f8 8d542408 lea edx,[esp+0x8]\par

7c8285fc cd2e int 2e\par

7c8285fe c3 ret\par

ntdll!RtlRaiseException:\par

7c8285ff 55 push ebp\par

7c828600 8bec mov ebp,esp\par

7c828602 8da42430fdffff lea esp,[esp-0x2d0]\par

\par

*----> Stack Back Trace <----*\par

*** ERROR: Symbol file could not be found. Defaulted to export symbols for C:\\WINDOWS\\system32\\MSVCRT.dll - \par

ChildEBP RetAddr Args to Child \par

WARNING: Stack unwind information not available. Following frames may be wrong.\par

016bff3c 77e61c8d 00000a74 0000ea60 00000000 ntdll!KiFastSystemCallRet\par

016bff50 004b2d13 00000a74 0000ea60 004b2ceb kernel32!WaitForSingleObject+0x12\par

016bff5c 004b2ceb 00000a74 0000ea60 00404421 lde!tsEventWaitMs+0x23 (FPO: [2,0,0])\par

016bff68 00404421 00000a74 0000003c 00000000 lde!tsEventWait+0x1b (FPO: [2,0,0])\par

016bff84 77bcb530 0012fd38 00000000 00000000 lde!call_maintenance+0x71 (FPO: [EBP 0x016bffb8] [1,0,4])\par

016bffb8 77e64829 008eba68 00000000 00000000 MSVCRT!endthreadex+0xa3\par

016bffec 00000000 77bcb4bc 008eba68 00000000 kernel32!GetModuleHandleA+0xdf\par

\par

*----> Raw Stack Dump <----*\par

00000000016bfecc 0b 7d 82 7c 1e 1d e6 77 - 74 0a 00 00 00 00 00 00 .\}.|...wt.......\par

00000000016bfedc 10 ff 6b 01 a4 be bd 77 - 63 c9 71 49 01 00 00 00 ..k....wc.qI....\par

00000000016bfeec 24 00 00 00 01 00 00 00 - 00 00 00 00 00 00 00 00 $...............\par

00000000016bfefc 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 ................\par

00000000016bff0c 00 00 00 00 00 ba 3c dc - ff ff ff ff 00 50 fd 7f ......<......P..\par

00000000016bff1c 10 ff 6b 01 02 01 00 00 - e0 fe 6b 01 e8 2b 07 89 ..k.......k..+..\par

00000000016bff2c a8 ff 6b 01 60 1a e6 77 - 48 1d e6 77 00 00 00 00 ..k.`..wH..w....\par

00000000016bff3c 50 ff 6b 01 8d 1c e6 77 - 74 0a 00 00 60 ea 00 00 P.k....wt...`...\par

00000000016bff4c 00 00 00 00 9c 0a 00 00 - 13 2d 4b 00 74 0a 00 00 .........-K.t...\par

00000000016bff5c 60 ea 00 00 eb 2c 4b 00 - 74 0a 00 00 60 ea 00 00 `....,K.t...`...\par

00000000016bff6c 21 44 40 00 74 0a 00 00 - 3c 00 00 00 00 00 00 00 [email protected]...<.......\par

00000000016bff7c 98 6d 97 00 b8 ff 6b 01 - 68 ba 8e 00 30 b5 bc 77 .m....k.h...0..w\par

00000000016bff8c 38 fd 12 00 00 00 00 00 - 00 00 00 00 68 ba 8e 00 8...........h...\par

00000000016bff9c 01 00 00 00 90 ff 6b 01 - 5e 00 85 80 dc ff 6b 01 ......k.^.....k.\par

00000000016bffac 74 6c bc 77 48 41 ba 77 - 00 00 00 00 ec ff 6b 01 tl.wHA.w......k.\par

00000000016bffbc 29 48 e6 77 68 ba 8e 00 - 00 00 00 00 00 00 00 00 )H.wh...........\par

00000000016bffcc 68 ba 8e 00 00 00 00 00 - c4 ff 6b 01 5d 06 85 80 h.........k.]...\par

00000000016bffdc ff ff ff ff 60 1a e6 77 - 30 48 e6 77 00 00 00 00 ....`..w0H.w....\par

00000000016bffec 00 00 00 00 00 00 00 00 - bc b4 bc 77 68 ba 8e 00 ...........wh...\par

00000000016bfffc 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 ................\par

\par

*----> State Dump for Thread Id 0xe08 <----*\par

\par

eax=c0000024 ebx=ffffff6f ecx=017bff3c edx=7c8285ec esi=003c40ac edi=003c40a8\par

eip=7c84af4d esp=017bff4c ebp=017bff4c iopl=0 nv up ei ng nz na po nc\par

cs=001b ss=0023 ds=0023 es=0023 fs=003b gs=0000 efl=00000286\par

\par

function: ntdll!RtlIpv4StringToAddressExW\par

7c84af33 c3 ret\par

7c84af34 23ff and edi,edi\par

7c84af36 ff6a00 jmp fword ptr [edx]\par

7c84af39 6a00 push 0x0\par

7c84af3b 56 push esi\par

7c84af3c 50 push eax\par

7c84af3d e85dcefdff call ntdll!ZwReleaseKeyedEvent (7c827d9f)\par

7c84af42 e9c123ffff jmp ntdll!RtlpUnWaitCriticalSection+0x22 (7c83d308)\par

7c84af47 50 push eax\par

7c84af48 e825d7fdff call ntdll!RtlRaiseStatus (7c828672)\par

FAULT ->7c84af4d cc int 3\par

7c84af4e 3bca cmp ecx,edx\par

7c84af50 740f jz ntdll!RtlIpv4StringToAddressExW+0x95e3 (7c84af61)\par

7c84af52 8b0d2084887c mov ecx,[ntdll!NlsMbOemCodePageTag+0xcf8 (7c888420)]\par

7c84af58 3b4824 cmp ecx,[eax+0x24]\par

7c84af5b 0f85f523ffff jne ntdll!RtlpUnWaitCriticalSection+0x70 (7c83d356)\par

7c84af61 5f pop edi\par

7c84af62 c74604feffffff mov dword ptr [esi+0x4],0xfffffffe\par

7c84af69 c7460801000000 mov dword ptr [esi+0x8],0x1\par

7c84af70 89560c mov [esi+0xc],edx\par

7c84af73 895610 mov [esi+0x10],edx\par

\par

*----> Stack Back Trace <----*\par

ChildEBP RetAddr Args to Child \par

WARNING: Stack unwind information not available. Following frames may be wrong.\par

017bff4c 7c83d2dc 003c40a8 00977100 00000008 ntdll!RtlIpv4StringToAddressExW+0x95cf\par

017bff64 004b2c44 003c40a8 00432cc1 003c40a8 ntdll!RtlLockHeap+0x2b7\par

017bff6c 00432cc1 003c40a8 00000000 00977230 lde!tsCriticalSectionLeave+0x14 (FPO: [1,0,0])\par

017bff84 77bcb530 00977100 00000000 00000000 lde!start_pool_thread+0x1a1 (FPO: [EBP 0x017bff88] [1,0,4])\par

017bffb8 77e64829 008eba68 00000000 00000000 MSVCRT!endthreadex+0xa3\par

017bffec 00000000 77bcb4bc 008eba68 00000000 kernel32!GetModuleHandleA+0xdf\par

\par

*----> Raw Stack Dump <----*\par

00000000017bff4c 64 ff 7b 01 dc d2 83 7c - a8 40 3c 00 00 71 97 00 d.\{....|.@<..q..\par

00000000017bff5c 08 00 00 00 92 01 00 00 - 01 00 00 00 44 2c 4b 00 ............D,K.\par

00000000017bff6c a8 40 3c 00 c1 2c 43 00 - a8 40 3c 00 00 00 00 00 .@<..,C..@<.....\par

00000000017bff7c 30 72 97 00 b8 ff 7b 01 - 68 ba 8e 00 30 b5 bc 77 0r....\{.h...0..w\par

00000000017bff8c 00 71 97 00 00 00 00 00 - 00 00 00 00 68 ba 8e 00 .q..........h...\par

00000000017bff9c 24 00 00 c0 90 ff 7b 01 - 3c fb 7b 01 dc ff 7b 01 $.....\{.<.\{...\{.\par

00000000017bffac 74 6c bc 77 48 41 ba 77 - 00 00 00 00 ec ff 7b 01 tl.wHA.w......\{.\par

00000000017bffbc 29 48 e6 77 68 ba 8e 00 - 00 00 00 00 00 00 00 00 )H.wh...........\par

00000000017bffcc 68 ba 8e 00 24 00 00 c0 - c4 ff 7b 01 3c fb 7b 01 h...$.....\{.<.\{.\par

00000000017bffdc ff ff ff ff 60 1a e6 77 - 30 48 e6 77 00 00 00 00 ....`..w0H.w....\par

00000000017bffec 00 00 00 00 00 00 00 00 - bc b4 bc 77 68 ba 8e 00 ...........wh...\par

00000000017bfffc 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 ................\par

00000000017c000c 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 ................\par

00000000017c001c 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 ................\par

00000000017c002c 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 ................\par

00000000017c003c 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 ................\par

00000000017c004c 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 ................\par

00000000017c005c 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 ................\par

00000000017c006c 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 ................\par

00000000017c007c 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 ................\par

\par

}

[ɹəuəllıʍ ʇɐb]

As configuring my application to run is very complex, I postponed analysing exact time elapsed before select() returns.

You could just write a test application that does nothing but the two select() calls; one with - say - 1 second delay, and the other with 0. Then put the timestamps around it and print them out.

Sorry, I don't know what to do with Dr. Watson output.