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UISimulator: cleaner startup using semaphore only to tell when event_thread is done initializing.

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@26317 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Michael Sevakis 2010-05-26 21:11:40 +00:00
parent c9133db4b1
commit 28a7c5d369
1 changed files with 11 additions and 26 deletions
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37
firmware/target/hosted/sdl/system-sdl.c
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@ -75,17 +75,6 @@ void sys_poweroff(void)
* Button read loop */
void gui_message_loop(void);
/*
* This callback let's the main thread run again after SDL has been initialized
**/
static uint32_t cond_signal(uint32_t interval, void *param)
{
(void)interval;
SDL_cond *c = (SDL_cond*)param;
/* remove timer, CondSignal returns 0 on success */
return SDL_CondSignal(c);
}
/*
* This thread will read the buttons in an interrupt like fashion, and
* also initializes SDL_INIT_VIDEO and the surfaces
@ -143,9 +132,9 @@ static int sdl_event_thread(void * param)
if (background && picture_surface != NULL)
SDL_BlitSurface(picture_surface, NULL, gui_surface, NULL);
/* calling SDL_CondSignal() right away here doesn't work reliably so
* post-pone it a bit */
SDL_AddTimer(100, cond_signal, param);
/* let system_init proceed */
SDL_SemPost((SDL_sem *)param);
/*
* finally enter the button loop */
while(1)
@ -157,26 +146,22 @@ static int sdl_event_thread(void * param)
void system_init(void)
{
SDL_cond *c;
SDL_mutex *m;
SDL_sem *s;
if (SDL_Init(SDL_INIT_TIMER))
panicf("%s", SDL_GetError());
atexit(sys_poweroff);
c = SDL_CreateCond();
m = SDL_CreateMutex();
s = SDL_CreateSemaphore(0); /* 0-count so it blocks */
SDL_CreateThread(sdl_event_thread, c);
SDL_CreateThread(sdl_event_thread, s);
/* Lock mutex and wait for sdl_event_thread to run so that it can
* initialize the surfaces and video subsystem needed for SDL events */
SDL_LockMutex(m);
SDL_CondWait(c, m);
SDL_UnlockMutex(m);
/* 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_DestroyCond(c);
SDL_DestroyMutex(m);
SDL_DestroySemaphore(s);
}
void system_exception_wait(void)