07-29-2006
Yeah I also had dsl in mind but was thinking if an older system (sunOS, BSD?) wouldn't be better for the box, since it's supposed to be used as a desktop. I'm looking in it right now and it seems it has 48 or 64 MB memory, a 233 mhz processor with a too old mothercard (only supporting 133) and an 8 GB hard-drive (so space will not be an issue). But abou DSL? Isn't that completely dektop oriented? Can I even switch X system on it?
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LEARN ABOUT NETBSD
cpu_switchto
CPU_SWITCHTO(9) BSD Kernel Developer's Manual CPU_SWITCHTO(9)
NAME
cpu_switchto -- machine-dependent LWP context switching interface
SYNOPSIS
#include <sys/cpu.h>
lwp_t *
cpu_switchto(lwp_t *oldlwp, lwp_t *newlwp, bool returning);
DESCRIPTION
The cpu_switchto() function saves the context of the LWP which is currently running on the processor, and restores the context of the LWP
specified by newlwp.
Remarks:
1. cpu_switchto() does not switch address spaces.
2. cpu_switchto() sets curlwp(9) to newlwp. If the architecture does non-interlocked adaptive mutex release, cpu_switchto() does an
equivalent of membar_producer(3), before and after the modification of curlwp(9).
3. cpu_switchto() should be called at IPL_SCHED. When the function returns, the caller should lower the priority level as soon as
possible.
4. cpu_switchto() might be called with spin mutexes held.
The function takes the following arguments.
oldlwp Specify the LWP from which the switch is going to be made, i.e., the calling LWP. If it was NULL, the context of the LWP
currently running on this processor is not saved.
newlwp Specify the LWP to which to switch. It must not be NULL.
returning Only meaningful if the architecture implements fast software interrupts. If true, it indicates that oldlwp is a soft
interrupt LWP that is blocking. It is a good indication that any kind of address space or user activity can be completely
ignored. For example: ras_lookup(9), cache flushes, TLB wirings, adjusting lazy FPU state. All that is required is to
restore the register state and stack, and return to the interrupted LWP.
RETURN VALUES
The cpu_switchto() function does not return until another LWP calls cpu_switchto(). It returns the oldlwp argument of the cpu_switchto()
which is called to switch back to our LWP. It is either a LWP which called cpu_switchto() to switch to us or NULL in case the LWP was exit-
ing.
SEE ALSO
membar_producer(3), swapcontext(3), intro(9), mutex(9), spl(9)
BSD
June 2, 2011 BSD