Compiler considerations Post: 302367533

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Top Forums Programming Compiler considerations Post 302367533 by MrUser on Tuesday 3rd of November 2009 02:08:13 AM

11-03-2009

Registered User

Compiler considerations

Hi this is rather basic question but to answer and understand the problem nedded expert.

compilers are OS dependent but OS may use any processor
how the compilers are able to generate code for different processors

just consider the below scenario:

Code:

 
Compilers:              dev c/VC++                 gcc                  turbo 
 
OS:                        windows                    linux                  DOS 
 
Processors:                              intel/motorola/AMD/celeron

any processor i can use for any system.

if we consider gcc, it can generate code for intel or motorola or AMD on some other OS.
how its achieving this.

what are the issues ( related to portability ) considered during the design of the compiler?

will they specify the set of processors that the compiler can generate the code for?

if so, they need to add the code for any newly invented processor.

MrUser

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LEARN ABOUT NETBSD

cpu_need_resched

CPU_NEED_RESCHED(9)					   BSD Kernel Developer's Manual				       CPU_NEED_RESCHED(9)

NAME

     cpu_need_resched -- context switch notification

SYNOPSIS

     #include <sys/cpu.h>

     void
     cpu_need_resched(struct cpu_info *ci, int flags);

DESCRIPTION

     The cpu_need_resched() function is the machine-independent interface for the scheduler to notify machine-dependent code that a context switch
     from the current LWP, on the cpu ci, is required.	This event may occur if a higher priority LWP appears on the run queue or if the current
     LWP has exceeded its time slice.

     If RESCHED_KPREEMPT flag is specified in flags and __HAVE_PREEMPTION C pre-processor macro is defined in <machine/intr.h>, machine-dependent
     code should make a context switch happen as soon as possible even if the cpu is running the kernel code.

     If RESCHED_IMMED flag is specified in flags, machine-dependent code should make a context switch happen as soon as possible.  In that case,
     for example, if ci is not the current processor, cpu_need_resched() typically issues an inter processor call to the processor to make it
     notice the need of a context switch as soon as possible.

     Typically, the cpu_need_resched() function will perform the following operations:

	   o   Set a per-processor flag which is checked by userret(9) when returning to user-mode execution.

	   o   Post an asynchronous software trap (AST).

	   o   Send an inter processor interrupt to wake up cpu_idle(9).

SEE ALSO

     sched_4bsd(9), userret(9)

BSD
								   July 31, 2010							       BSD