guWhiteboard_gugenericwhiteboardobject.cpp

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#include "guWhiteboard_gugenericwhiteboardobject.h"
#include "guwhiteboardtypelist_c_generated.h"
 
#include <stdlib.h>
 
static void create_guWhiteboard_singleton_whiteboard(void *);
 
static gu_simple_whiteboard_descriptor *guWhiteboard_whiteboard_descriptor;
 
static void create_guWhiteboard_singleton_whiteboard(void *)
{
    const char *name = "guWhiteboard";
 
#ifndef GSW_IOS_DEVICE
    const char *env = getenv(GSW_DEFAULT_ENV);
    if (env && *env) name = env;
#endif
 
//taken from gusimplewhiteboard.c, should we make this from a hash of the whiteboard name?
#define SEMAPHORE_MAGIC_KEY     4242
 
    guWhiteboard_whiteboard_descriptor = gsw_new_custom_whiteboard(
        name, 
        wb_types_stringValues,
        WB_NUM_TYPES_DEFINED,
        SEMAPHORE_MAGIC_KEY
    );
}
 
gu_simple_whiteboard_descriptor *get_guWhiteboard_singleton_whiteboard(void)
{
#ifdef WITHOUT_LIBDISPATCH  // not thread-safe without libdispatch!
    if (!guWhiteboard_whiteboard_descriptor)
    {
        guWhiteboard_whiteboard_descriptor = (gu_simple_whiteboard_descriptor *)~0;
        create_guWhiteboard_singleton_whiteboard(NULLPTR);
    }
#else
    static dispatch_once_t onceToken;
    dispatch_once_f(&onceToken, NULLPTR, create_guWhiteboard_singleton_whiteboard);
#endif
    return guWhiteboard_whiteboard_descriptor;
}