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To: cygwin@cygwin.com
Subject: Re: cygwin 3.5.4-1: signal handling destroys 'long double' values
Date: Mon, 14 Oct 2024 00:27:25 +0900
Message-ID: <d2d2c7b2-1c01-452f-b23b-eeb6eaac9ddf@gmail.com>
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From: jojelino via Cygwin <cygwin@cygwin.com>
Reply-To: jojelino <jojelino@gmail.com>
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On 10/7/2024 10:11 PM, Christian Franke via Cygwin wrote:
> $ cat sigtest.c
> #include <signal.h>
> #include <stdio.h>
> 
> static volatile sig_atomic_t sigcnt;
> 
> static void sigint_handler(int sig)
> {
>    (void)sig;
>    sigcnt++;
> }
> 
> #ifndef WORKS
> typedef long double float_type;
> #define FMT "La"
> #else
> typedef double float_type;
> #define FMT "a"
> #endif
> 
> int main()
> {
>    signal(SIGINT, sigint_handler);
>    volatile float_type x = 0x1.23456789p+0;
>    while (sigcnt < 42) {
>      volatile float_type y = x;
>      volatile float_type d = y - x;
>      if (d != 0.0)
>        printf("x = %" FMT ", y = %" FMT ", d = %" FMT "\n", x, y, d);
>    }
> }
> 
> $ gcc -o sigtest -O2 sigtest.c
> 
> $ ./sigtest > out.txt
> (press ^C 42x 🙂

Reproduced same as you did.

I have a installed memory in DIMMs of laptop that is not in a list of 
supported memory of DDR4. although result of dmidecode on smbios is said 
that maximum of 64GB is allowed. So memory read error is commonplace in 
heavy load.

I suggest you to try below command line as I don't experience it anymore.

Please try it out.

$ sed -E '25a usleep(100000);' sigtest.c|gcc -x c -O2 -msse3 
-mfpmath=sse -;./a.exe
<stdin>: In function ‘main’:
<stdin>:26:1: warning: implicit declaration of function ‘usleep’ 
[-Wimplicit-function-declaration]
(press ^C 42x 🙂

$ ^C


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