Implement cooperative threads on hosted platforms using C code.

This replaces SDL threads with real cooperative threads, which are less cpu intensive and allow priority scheduling.
The backend for context switching is dependant on the host (sigaltstack/longjmp on Unix, Fibers on Windows).
configure has options to force or disallow SDL threads.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@29327 a1c6a512-1295-4272-9138-f99709370657

1 files changed, 3 insertions, 0 deletions

diff --git a/firmware/target/hosted/sdl/system-sdl.h b/firmware/target/hosted/sdl/system-sdl.h
index 01952e50a0..bec01ec81d 100644
--- a/firmware/target/hosted/sdl/system-sdl.h
+++ b/firmware/target/hosted/sdl/system-sdl.h
@@ -46,6 +46,9 @@ void sys_poweroff(void);
 void sys_handle_argv(int argc, char *argv[]);
 void gui_message_loop(void);
 void sim_do_exit(void);
+#ifndef HAVE_SDL_THREADS
+void wait_for_interrupt(void);
+#endif
 
 extern bool background;  /* True if the background image is enabled */
 extern bool showremote;