context.h File Reference

Functionality required for context switching. More...

#include "types.h"

Include dependency graph for context.h:

This graph shows which files directly or indirectly include this file:

Classes
struct	StackPointer
	Structure for saving the stack pointer when switching coroutines. More...

Functions
void *	prepareContext (void *tos, void(*kickoff)(void *), void *param1=nullptr)
	Prepares a context for its first activation. More...
void	context_switch (StackPointer &current, StackPointer &next)
	Executes the context switch. More...
void	context_go (StackPointer &next)
	Executes a thread for the very first time. More...
void	trampoline_go ()
	Helper function to prepare parameters for Thread::kickoff. More...

Detailed Description

Functionality required for context switching.

Function Documentation

trampoline_go()

void trampoline_go

(

)

Helper function to prepare parameters for Thread::kickoff.

This function will copy the first parameter for the kickoff function from the non-scratch register r15 into the register rdi (which is the first parameter according to the SystemV ABI).

context_switch as well as context_go jump to this function on the first execution of a new context. The value mentioned above was placed on the stack by prepareContext during initialization and loaded into the register r15 while restoring the context in context_switch or context_go.