Fossil with Commonmark

}

/*
** atexit() handler which frees up "some" of the resources
** used by fossil.
*/
static void fossil_atexit(void) {
#if defined(_WIN32) && defined(FOSSIL_ENABLE_TCL) && defined(USE_TCL_STUBS)
#if defined(_WIN32) && !defined(_WIN64) && defined(FOSSIL_ENABLE_TCL) && defined(USE_TCL_STUBS)
  /*
  ** If Tcl is compiled on Windows using the latest MinGW, Fossil can crash
  ** when exiting while a stubs-enabled Tcl is still loaded.  This is due to
  ** a bug in MinGW, see:
  **
  **     http://comments.gmane.org/gmane.comp.gnu.mingw.user/41724
  **
  ** The workaround is to manually unload the loaded Tcl library prior to
  ** exiting the process.
  ** exiting the process. Win64 is not affected.
  */
  unloadTcl(g.interp, &g.tcl);
#endif
#ifdef FOSSIL_ENABLE_JSON
  cson_value_free(g.json.gc.v);
  memset(&g.json, 0, sizeof(g.json));
#endif

    Tcl_DeleteInterp(tclInterp);
    tclContext->interp = tclInterp = 0;
    return TH_ERROR;
  }
  return TH_OK;
}

#if defined(_WIN32) && !defined(_WIN64) && defined(FOSSIL_ENABLE_TCL) && defined(USE_TCL_STUBS)
/*
** Finalizes and unloads the previously loaded Tcl library, if applicable.
*/
int unloadTcl(
  Th_Interp *interp,
  void *pContext
){
  struct TclContext *tclContext = (struct TclContext *)pContext;
  Tcl_Interp *tclInterp;
  tcl_FinalizeProc *xFinalize;
#if defined(USE_TCL_STUBS)
  void *library;
#endif /* defined(USE_TCL_STUBS) */

  if ( !tclContext ){
    Th_ErrorMessage(interp,
        "invalid Tcl context", (const char *)"", 0);
    return TH_ERROR;
  }
  /*
  ** Grab the Tcl_Finalize function pointer prior to deleting the Tcl
  ** interpreter because the memory backing the Tcl stubs table will
  ** be going away.
  */
  xFinalize = tclContext->xFinalize;
  /*
  ** If the Tcl interpreter has been created, formally delete it now.
  */
  tclInterp = tclContext->interp;
  if ( tclInterp ){
    Tcl_DeleteInterp(tclInterp);
    tclContext->interp = tclInterp = 0;
    tclContext->interp = 0;
  }
  /*
  ** If the Tcl library is not finalized prior to unloading it, a deadlock
  ** can occur in some circumstances (i.e. the [clock] thread is running).
  */
  if( xFinalize ) xFinalize();
#if defined(USE_TCL_STUBS)
  /*
  ** If Tcl is compiled on Windows using the latest MinGW, Fossil can crash
  ** when exiting while a stubs-enabled Tcl is still loaded.  This is due to
  ** a bug in MinGW, see:
  **
  **     http://comments.gmane.org/gmane.comp.gnu.mingw.user/41724
  **
  ** The workaround is to manually unload the loaded Tcl library prior to
  ** exiting the process.
  */
  library = tclContext->library;
  if( library ){
    /*
    ** If the Tcl library is not finalized prior to unloading it, a deadlock
    ** can occur in some circumstances (i.e. the [clock] thread is running).
    */
    tclContext->xFinalize();
    dlclose(library);
    tclContext->library = library = 0;
    tclContext->library = 0;
  }
#endif /* defined(USE_TCL_STUBS) */
  return TH_OK;
}
#endif

/*
** Register the Tcl language commands with interpreter interp.
** Usually this is called soon after interpreter creation.
*/
int th_register_tcl(
  Th_Interp *interp,