CURPROC(9) BSD Kernel Developer's Manual CURPROC(9)NAME
curproc, curcpu, curlwp -- current process, processor, and LWP
struct cpu_info *
struct proc *
struct lwp *
The following macros can be used to retrieve the current processor, process, and light-weight process (LWP), respectively:
1. The machine-dependent curcpu() macro returns a pointer to a cpu_info structure containing information of the CPU that this thread
is running on.
2. The machine-independent curproc() macro refers to a pointer to the process currently running on this CPU.
3. The curlwp() macro expands to a pointer to lwp structure, containing information about the current LWP. This macro is machine-
independent, but machine-dependent <machine/cpu.h> may redefine it.
SEE ALSO cpu_number(9), proc_find(9)BSD July 1, 2010 BSD
Check Out this Related Man Page
CPU_NEED_RESCHED(9) BSD Kernel Developer's Manual CPU_NEED_RESCHED(9)NAME
cpu_need_resched -- context switch notification
cpu_need_resched(struct cpu_info *ci, int flags);
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
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