Re: [Mingw-users] Help - where is the C language sleep() function?

[Charles S. <cws...@tr...>]

On Fri, 18 May 2007 15:35:06 -0400
Roger Wells <ROG...@sa...> wrote:

> Brian Dessent wrote:
> 
> not so fast.
> when I am using MinGW with gcc 3.3.1 code using sleep() compiles, links 
> and runs as expected
> on the other hand using MinGW gcc 3.4.5, code using sleep() reports it 
> as an unresolved reference at link time.
> replacing sleep with _sleep in the source files fixes this.
> 
> versions:
> gcc version 3.3.1 (mingw special 20030804-1)
> GNU ld version 2.13.90 20030111
> and
> gcc version 3.4.5 (mingw special)
> GNU ld version 2.17.50 20060716
> 
> Also sleep is a common function but not completely standard (no mention 
> of it in ISO/IEC 9899 "C" spec).  It is, however, included in the POSIX 
> standard.  In any case it is dangerous since on Win32 the argument is 
> milliseconds and on POSIX implementations (e.g., RHEL 4.0) the units are 
> seconds.

Thanks for your response Roger.  I've decided for the time being to require
the Windows XP user to install the Windows Server 2003 Resource Kit Tools
from the Microsoft website.  I can execute the included sleep.exe program
when a sleep() is required.

Regards,
Charles Sullivan

> > Charles Sullivan wrote:
> >
> >   
> >> What else do I need to install to get the sleep() function?
> >>     
> >
> > You have a fundamental misunderstanding of MinGW's purpose if you expect
> > to port your software unchanged; if that is your goal, you should be
> > using Cygwin or something else.  What MinGW provides is exactly the API
> > provided by the Microsoft C runtime (MSVCRT) and the Win32 API.  sleep()
> > does not exist in either of those, so it failing to compile is the
> > expected behavior.
> >
> > All of this is documented fully on MSDN.  For a list of all functions
> > provided by MSVCRT:
> > <http://msdn2.microsoft.com/en-us/library/634ca0c2(VS.80).aspx>.  A
> > suitable replacement is the Win32 API function Sleep() (note the
> > capitalization difference)
> > <http://msdn2.microsoft.com/en-us/library/ms686298.aspx>.
> >
> > Also note that the footer of every Win32 API function tells you the
> > necessary header that must be included (in most cases, just #include
> > <windows.h>) and the libraries that must be linked.  You can directly
> > translate the text "Use Kernel32.lib" to "add -lkernel32 to the link
> > command line."  However, in this case, kernel32 is a pretty basic
> > library that every program links against (or alternatively put,
> > -lkernel32 is in the gcc specs file) so there's no need to manually add
> > it.  But the more you use the Win32 API, be aware that some functions
> > will require nondefault libraries to be specified on the link command
> > line.
> >
> > Brian
> >
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> 
> 
> -- 
> Roger Wells, P.E.
> SAIC
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