Function kickoff
Placement in the overall structure
- Module
- thread
- Time of creation
- Task 4
- Files
kickoff.cc
Description
For the very first activation of a Coroutine,
a "return address" to a function must be known, from which the transition
from the C to the C++ level can then be performed. This function should
be kickoff.
Activation of kickoff
When a Coroutine is initialized with the
toc_settle() function, not only is the toc
struct prepared for the first coroutine switch, but the address of the
kickoff function is also placed on the stack as the return address. The
first coroutine switch with toc_switch therefore "jumps back"
to the beginning of kickoff, where the execution starts.
Task description
void kickoff (void *dummy1, void *dummy2, void *dummy3, void *dummy4, void *dummy5, void *dummy6, Coroutine* object)-
This method realizes the jump from the C level to the C++ level by simply calling the method
action() of the coroutine object object found as parameter.
Notes
Since this function is not really called, but only jumped to by a clever
initialization of the stack of the coroutine, it must never terminate.
Otherwise a meaningless value would be interpreted as a return address
and the computer would crash.