exaple of DirectFB-Fusion

//master

#include <stdio.h> 

#include <unistd.h>

#include <stdbool.h>

#include <linux/fusion.h>

#include <fusion/fusion.h>

#include <fusion/shmalloc.h>

#include <fusion/call.h>

#include <fusion/arena.h>



// ABI version for sanity check

#define DFB_ABI 70

enum {
NEW_WORLD = -1,
EXISTING_WORLD
} FusionWorldType;
// Shared memory pool size

#define SHM_POOL_SIZE 0x1000000

FusionWorld *world;
FusionSHMPoolShared *pool;
/*
* Callback function called from fusion_arena_enter()
* Add here all variables that live in shared memory
*/
int initialize(FusionArena *arena, void *ctx) {
char *str = NULL;
printf("\t\t\tAllocate SHM for field in Arena (%s)\n", __FUNCTION__);
str = (char *)SHMALLOC(pool, 1024);
sprintf(str, "String in Arena!!!");
fusion_arena_add_shared_field(arena, "string1", (void *)str);
printf("\t\t\tThe string is shared? ");
fusion_is_shared(world, str) ? printf("Yes") : printf("No");
printf(" (%s)\n", __FUNCTION__);
return 0;

}
/*
* Callback function called from fusion_arena_enter()
*/
int shutdown(FusionArena *arena, void *ctx, bool emergency) {
char *str = NULL;
fusion_arena_get_shared_field(arena, "string1", (void *)&str);
printf("\n\t\t\tFree shared memory (%s)\n\n", __FUNCTION__);
SHFREE(pool, str);
return 0;

}
int main () {
int ret;
char c;
void *ctx;
FusionArena *arena;
printf("Creating Fusion world (%s)\n", __FUNCTION__);
fusion_enter(NEW_WORLD, DFB_ABI, FER_MASTER, &world);
printf("Fusion world created with index %d (%s)\n",
fusion_world_index(world), __FUNCTION__);
printf("Is this the master? ");
fusion_master(world) ? printf("Yes") : printf("No");
printf(" (%s)\n", __FUNCTION__);
printf("\tCreating SHM pool (%s)\n", __FUNCTION__);
fusion_shm_pool_create(world, "WM SHM pool", SHM_POOL_SIZE, 0, &pool);
printf("\t\tCreating Arena (%s)\n", __FUNCTION__);
fusion_arena_enter(world, "WM Arena", initialize, NULL, &ctx, &arena, &ret);
printf("\n\t\tPress enter to exit (%s)\n", __FUNCTION__);
read(1, &c, 1);
printf("\t\tShutting down Arena (%s)\n", __FUNCTION__);
fusion_arena_exit(arena, shutdown, NULL, &ctx, 0, &ret);
printf("\tDestroying SHM pool (%s)\n", __FUNCTION__);
fusion_shm_pool_destroy(world, pool);
printf("Exiting Fusion world (%s)\n", __FUNCTION__);
fusion_exit(world, 0);
return 0;

}



//slave

#include <stdio.h>

#include <unistd.h>

#include <linux/fusion.h>

#include <fusion/fusion.h>

#include <fusion/shmalloc.h>

#include <fusion/arena.h>


// ABI version for sanity check

#define DFB_ABI 70

enum {
NEW_WORLD = -1,
EXISTING_WORLD
} FusionWorldType;
FusionWorld *world;
/*
* Callback function called from fusion_arena_enter()
*/
int join(FusionArena *arena, void *ctx) {
char *str = NULL;
printf("\t\tJoin Arena (%s)\n", __FUNCTION__);
fusion_arena_get_shared_field(arena, "string1", (void *)&str);
printf("\t\tString in SHM: %s\n", str);
return 0;

}
/*
* Callback function called from fusion_arena_exit()
*/
int leave(FusionArena *arena, void *ctx, bool emergency) {
printf("\t\tLeave Arena (%s)\n", __FUNCTION__);
return 0;

}
int main() {
int ret;
char c;
void *ctx;
FusionArena *arena;
printf("Join Fusion world (%s)\n", __FUNCTION__);
fusion_enter(EXISTING_WORLD, DFB_ABI, FER_SLAVE, &world);
printf("Fusion world joined with index: %d (%s)\n",
fusion_world_index(world), __FUNCTION__);
printf("Am I the master? ");
fusion_master(world) ? printf("Yes") : printf("No");
printf(" (%s)\n", __FUNCTION__);
printf("\tJoin Arena (%s)\n", __FUNCTION__);
fusion_arena_enter(world, "WM Arena", NULL, join, &ctx, &arena, &ret);
printf("\n\tPress enter to finish\n");
read(1, &c, 1);
printf("\tLeave Arena (%s)\n", __FUNCTION__);
fusion_arena_exit(arena, NULL, leave, &ctx, 0, &ret);
printf("Exit Fusion world (%s)\n", __FUNCTION__);
fusion_exit(world, 0);
return 0;

}