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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:

	   ·   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).

	   ·   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
	       completed its time slice.

	   ·   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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