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From: | "Alex Vinokur" <alexvn AT bigfoot DOT com> |
Newsgroups: | comp.os.msdos.djgpp |
Subject: | Re: uclock_t & gcc 3.0.4 on Windows-2000 |
Date: | Mon, 22 Apr 2002 07:58:14 +0200 |
Organization: | Scopus |
Lines: | 149 |
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References: | <a9uahn$6ao8i$1 AT ID-79865 DOT news DOT dfncis DOT de> <7458-Sun21Apr2002182355+0300-eliz AT is DOT elta DOT co DOT il> |
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"Eli Zaretskii" <eliz AT is DOT elta DOT co DOT il> wrote in message news:7458-Sun21Apr2002182355+0300-eliz AT is DOT elta DOT co DOT il... | > From: "Alex Vinokur" <alexvn AT bigfoot DOT com> | > Newsgroups: comp.os.msdos.djgpp | > Date: Sun, 21 Apr 2002 15:17:15 +0200 | > | > start_uclock_ = 35292 | > end_uclock_ = 35306 | > start_uclock_ = -29321 | > end_uclock_ = -29307 | > Assertion failed at xxx.h line 34: start_uclock_ >= 0 | > Exiting due to signal SIGABRT | > Raised at eip=00007c8e | > eax=000bf9ec ebx=00000120 ecx=00000000 edx=00000000 esi=00000054 edi=0003fb60 | > ebp=000bfa98 esp=000bf9e8 program=D:\_T02_P~1\a.exe | > cs: sel=01f7 base=01e80000 limit=000cffff | > ds: sel=01ff base=01e80000 limit=000cffff | > es: sel=01ff base=01e80000 limit=000cffff | > fs: sel=01cf base=00012150 limit=0000ffff | > gs: sel=020f base=00000000 limit=0010ffff | > ss: sel=01ff base=01e80000 limit=000cffff | > App stack: [000bfb60..0003fb60] Exceptn stack: [0003fabc..0003db7c] | > | > Call frame traceback EIPs: | > 0x00007bb4 | > 0x00007c8e | > 0x000057f9 | > 0x00017cc6 | > 0x0000161b | > 0x00005278 | > ######################### | > | > We can see that behavior of uclock_t is not long-long-behavior. | > | > Any explanation? | | I can suggest two possible explanations: | | - the C++ library has a bug when printing long long variables via | cout (did you try an equivalent C program?); An equivalent C program usually generates the same result (sometimes it works OK). ###### C code : Source file : BEGIN ###### /* File yyy2.c */ #include <stdio.h> #include <assert.h> #include <time.h> int main() { #define TOTAL_TIMES 1000 int i; uclock_t start_uclock; uclock_t end_uclock; for (i = 0; i < TOTAL_TIMES; i++) { start_uclock = uclock(); printf ("[%d] start_uclock = %ld\n", i, start_uclock); fflush (NULL); assert (start_uclock >= 0); end_uclock = uclock(); printf ("[%d] end_uclock = %ld\n", i, end_uclock); fflush (NULL); assert (end_uclock >= 0); assert (start_uclock < end_uclock); } return 0; } ###### C code : Source file : END ######## ###### Compilation : BEGIN ###### %gcc yyy2.c ###### Compilation : END ######## ######## Running : BEGIN ######## %a.exe [0] start_uclock = 0 [0] end_uclock = 293 [1] start_uclock = 398 [1] end_uclock = 479 [2] start_uclock = 553 [2] end_uclock = 627 [omitted] [477] start_uclock = 38988 [477] end_uclock = 39027 [478] start_uclock = 39065 [478] end_uclock = 39104 [479] start_uclock = 39142 [479] end_uclock = 39181 [480] start_uclock = -26316 Assertion failed at yyy2.c line 19: start_uclock >= 0 Exiting due to signal SIGABRT Raised at eip=0000467e eax=0074febc ebx=00000120 ecx=00000000 edx=00000000 esi=00000054 edi=0000fb60 ebp=0074ff68 esp=0074feb8 program=D:\_T02_P~1\a.exe cs: sel=01f7 base=017f0000 limit=0075ffff ds: sel=01ff base=017f0000 limit=0075ffff es: sel=01ff base=017f0000 limit=0075ffff fs: sel=01cf base=00012150 limit=0000ffff gs: sel=020f base=00000000 limit=0010ffff ss: sel=01ff base=017f0000 limit=0075ffff App stack: [00750000..006d0000] Exceptn stack: [0000fac0..0000db80] Call frame traceback EIPs: 0x000045a4 0x0000467e 0x000036f9 0x000016c8 0x00003038 ######## Running : END ########## | | - uclock tries to reprogram the system timer chip, but Windows 2000, | being of the NT family, doesn't let you do so. -- ==================== Alex Vinokur http://up.to/alexvn http://go.to/alexv_math mailto:alexvn AT bigfoot DOT com mailto:alexvn AT go DOT to ====================
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