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@c Direct syscall on Linux; alias to swtch on HURD.

This function voluntarily gives up the task's claim on the CPU.

Technically, @code{sched_yield} causes the calling task to be made
immediately ready to run (as opposed to running, which is what it was
before).  This means that if it has absolute priority higher than 0, it
gets pushed onto the tail of the queue of tasks that share its
absolute priority and are ready to run, and it will run again when its
turn next arrives.  If its absolute priority is 0, it is more
complicated, but still has the effect of yielding the CPU to other
tasks.

If there are no other tasks that share the calling task's absolute
priority, this function doesn't have any effect.

To the extent that the containing program is oblivious to what other
processes in the system are doing and how fast it executes, this

error: patch failed: manual/resource.texi:929
error: manual/resource.texi: patch does not apply