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Implement cooperative threads on hosted platforms using C code.

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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
This commit is contained in:
Thomas Martitz 2011-02-18 22:46:01 +00:00
parent 3926c30705
commit 6d85de3419
13 changed files with 580 additions and 27 deletions
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21
firmware/target/hosted/sdl/system-sdl.c
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@ -184,7 +184,9 @@ static int sdl_event_thread(void * param)
/* Order here is relevent to prevent deadlocks and use of destroyed
sync primitives by kernel threads */
sim_thread_shutdown();
#ifdef HAVE_SDL_THREADS
sim_thread_shutdown(); /* not needed for native threads */
#endif
sim_kernel_shutdown();
return 0;
@ -199,9 +201,13 @@ void sim_do_exit(void)
exit(EXIT_SUCCESS);
}
uintptr_t *stackbegin;
uintptr_t *stackend;
void system_init(void)
{
SDL_sem *s;
/* fake stack, OS manages size (and growth) */
stackbegin = stackend = (uintptr_t*)&s;
#if (CONFIG_PLATFORM & PLATFORM_MAEMO)
/* Make glib thread safe */
@ -219,21 +225,24 @@ void system_init(void)
/* wait for sdl_event_thread to run so that it can initialize the surfaces
* and video subsystem needed for SDL events */
SDL_SemWait(s);
/* cleanup */
SDL_DestroySemaphore(s);
}
void system_exception_wait(void)
{
sim_thread_exception_wait();
}
void system_reboot(void)
{
#ifdef HAVE_SDL_THREADS
sim_thread_exception_wait();
#else
sim_do_exit();
#endif
}
void system_exception_wait(void)
{
system_reboot();
}
void sys_handle_argv(int argc, char *argv[])
{