09-24-2009
Many thanks pludi ... that makes more sense now. I had wondered about the parallelism of the statement but wasn't entirely sure how it would be treated.
I think I had assumed that the implied dependency of the output process on the input process would be understood by the scheduler but maybe it isn't that clever.
Gavin
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LEARN ABOUT NETBSD
userret
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