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SDL2 driver: Use threaded model approach for easier debugging.

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This still retains the previous fork() based design if GFX_SDL_USE_FORK is enabled.
This commit is contained in:
Joel Bodenmann 2021-08-10 20:02:29 +02:00
parent 47d9826a0a
commit a3bd2d25ce
2 changed files with 53 additions and 27 deletions
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71
drivers/multiple/SDL/gdisp_lld_SDL.c
View file

@ -19,6 +19,9 @@
#include <signal.h>
#include <semaphore.h>
#include <SDL.h>
#if GFX_SDL_USE_FORK
#include <assert.h>
#endif
#define GDISP_DRIVER_VMT GDISPVMT_SDL
#include "gdisp_lld_config.h"
@ -177,7 +180,6 @@ static sem_t *input_event;
#define CTX_MUTEX_NAME "ugfx_ctx_mutex"
#define INPUT_EVENT_NAME "ugfx_input_event"
static int SDL_loop (void) {
SDL_Window *window = SDL_CreateWindow("uGFX", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, GDISP_SCREEN_WIDTH, GDISP_SCREEN_HEIGHT, 0);
SDL_Renderer *render = SDL_CreateRenderer(window, -1, SDL_RENDERER_ACCELERATED | SDL_RENDERER_PRESENTVSYNC);
@ -291,6 +293,40 @@ static int SDL_loop (void) {
return 0;
}
static void* SDL_start(void* arg)
{
// Get the PID (if supposed to)
#if GFX_SDL_USE_FORK
int status;
pid_t gui_pid = (pid_t)arg;
assert(gui_pid != 0);
#else
(void)arg;
#endif
// Main proccess. It's for host UI and SDL
memset (context,0,sizeof (*context));
context->need_redraw = 1;
context->maxx = GDISP_SCREEN_WIDTH-1;
context->maxy = GDISP_SCREEN_HEIGHT-1;
context->minx = 0;
context->miny = 0;
SDL_loop();
// cleanup
#if GFX_SDL_USE_FORK
kill(gui_pid, SIGKILL);
waitpid(gui_pid, &status, 0);
#endif
SDL_Quit();
munmap(context,sizeof (*context));
sem_close(ctx_mutex);
sem_unlink(CTX_MUTEX_NAME);
sem_close(input_event);
sem_unlink(INPUT_EVENT_NAME);
exit(0);
}
static void *SDL_input_event_loop (void *arg) {
(void)arg;
for (;;) {
@ -334,35 +370,22 @@ void sdl_driver_init (void) {
perror("Failed init semaphore");
exit(1);
}
pid_t gui_pid = fork ();
if (gui_pid) {
// Main proccess. It's for host UI and SDL
int status;
memset (context,0,sizeof (*context));
context->need_redraw = 1;
context->maxx = GDISP_SCREEN_WIDTH-1;
context->maxy = GDISP_SCREEN_HEIGHT-1;
context->minx = 0;
context->miny = 0;
SDL_loop ();
// cleanup
kill(gui_pid,SIGKILL);
waitpid(gui_pid, &status, 0);
SDL_Quit ();
munmap (context,sizeof (*context));
sem_close (ctx_mutex);
sem_unlink (CTX_MUTEX_NAME);
sem_close (input_event);
sem_unlink (INPUT_EVENT_NAME);
exit (0);
}
#if GFX_SDL_USE_FORK
pid_t gui_pid = fork();
if (gui_pid)
SDL_start((void*)gui_pid);
#else
pthread_t thread_sdl;
pthread_create(&thread_sdl, NULL, SDL_start, NULL);
pthread_detach(thread_sdl);
#endif
// Create thread for input events processing
pthread_t thread;
pthread_create(&thread, NULL, SDL_input_event_loop, NULL);
pthread_detach (thread);
// Continue execution of ugfx UI in forked process
// Continue execution of ugfx UI in forked process (or corresponding thread_sdl)
}

3
drivers/multiple/SDL/gdisp_lld_config.h
View file

@ -12,6 +12,9 @@
/* Driver hardware support. */
/*===========================================================================*/
// Whether to use separate processes or multi-threading approach for SDL management.
#define GFX_SDL_USE_FORK GFXOFF
#define GDISP_HARDWARE_DRAWPIXEL GFXON
#define GDISP_HARDWARE_FILLS GFXON
#define GDISP_HARDWARE_BITFILLS GFXOFF