SCHED_M2(9) BSD Kernel Developer's Manual SCHED_M2(9)NAME
sched_m2 -- The M2 thread scheduler
SYNOPSIS
#include <sys/sched.h>
DESCRIPTION
The M2 scheduler implements a scheduling algorithm similar to the scheduler implementations of UNIX System V Release 4 and Solaris.
CODE REFERENCES
The M2 scheduler is implemented within the file sys/kern/sched_m2.c.
SEE ALSO csf(9), hardclock(9), mi_switch(9), sched_4bsd(9), userret(9)
Berny Goodheart and James Cox, The Magic Garden Explained: The Internals of UNIX System V Release 4, Prentice Hall, 1994.
BSD March 5, 2010 BSD
Check Out this Related Man Page
USERRET(9) BSD Kernel Developer's Manual USERRET(9)NAME
userret -- return path to user-mode execution
SYNOPSIS
#include <sys/lwp.h>
#include <sys/sched.h>
void
userret(struct lwp *l);
DESCRIPTION
The userret() function is executed after processing a trap (e.g., a system call or interrupt) before returning to user-mode execution. The
implementation is machine dependent and is never invoked from machine-independent code. The function prototype for each architecture may be
different to the prototype above, however the functionally provided by the userret() function on each architecture is essentially the same.
Specifically, the userret() function performs the following procedure:
o Detect a change in the signal disposition of the current process and invoke postsig(9) to post the signal to the process. This may
occur when the outcome of the trap or syscall posted a signal to the process (e.g., invalid instruction trap).
o Check the want_resched flag to see if the scheduler requires the current process to be preempted by invoking preempt(9) (see
cpu_need_resched(9)). This may occur if the clock interrupt causes the scheduler to determine that the current process has com-
pleted its time slice.
o Update the scheduler state.
SEE ALSO cpu_need_resched(9), postsig(9), preempt(9), scheduler(9)BSD December 20, 2005 BSD
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