The
makecontext()
function
modifies the user thread context pointed to by
ucp,
which must have previously been initialized by a call to
getcontext(3)
and had a stack allocated for it.
The context is modified so that it will continue execution by invoking
func()
with the arguments provided.
The
argc
argument
must be equal to the number of additional arguments of type
int
provided to
makecontext()
and also equal to the number of arguments of type
int
to
func();
otherwise ,
the behavior is undefined.
The
ucp->uc_link
argument
must be initialized before calling
makecontext()
and determines the action to take when
func()
returns:
if equal to
NULL,
the process exits;
otherwise,
setcontext(ucp->uc_link)
is implicitly invoked.
The
swapcontext()
function
saves the current thread context in
*oucp
and makes
*ucp
the currently active context.
