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As described in issue #56733, there is a possibility of a race condition in SSmapping.add_new_zlevel - either during Z level incrementing, or the proc itself, as it only expands the amount of registered z-levels after being finished. While the first hopefully shouldn't happen, it can still manifest because of the CHECK_TICK within. A practical result is that two concurrent calls to this proc will both create a new Z-level, but actually report having made the same first one. This is problematic for map_templates that will then load blindly to the reported Z-level when using load_new_z, overwriting each other. We sometimes encounter that end result on CM13 codebase because of a map load that can be triggered by an user topic - if two people click at the same time, it's not unlikely for the first call to sleep in CHECK_TICK and let the second run, causing double-loading.
The code in this module originally evolved from dmm_suite and has since been specialized for SS13 and otherwise tweaked to fit /tg/station's needs. dmm_suite version 1.0 Released January 30th, 2011. NOTE: Map saving functionality removed defines the object /dmm_suite - Provides the proc load_map() - Loads the specified map file onto the specified z-level. - provides the proc write_map() - Returns a text string of the map in dmm format ready for output to a file. - provides the proc save_map() - Returns a .dmm file if map is saved - Returns FALSE if map fails to save The dmm_suite provides saving and loading of map files in BYOND's native DMM map format. It approximates the map saving and loading processes of the Dream Maker and Dream Seeker programs so as to allow editing, saving, and loading of maps at runtime. ------------------------ To save a map at runtime, create an instance of /dmm_suite, and then call write_map(), which accepts three arguments: - A turf representing one corner of a three dimensional grid (Required). - Another turf representing the other corner of the same grid (Required). - Any, or a combination, of several bit flags (Optional, see documentation). The order in which the turfs are supplied does not matter, the /dmm_writer will determine the grid containing both, in much the same way as DM's block() function. write_map() will then return a string representing the saved map in dmm format; this string can then be saved to a file, or used for any other purose. ------------------------ To load a map at runtime, create an instance of /dmm_suite, and then call load_map(), which accepts two arguments: - A .dmm file to load (Required). - A number representing the z-level on which to start loading the map (Optional). The /dmm_suite will load the map file starting on the specified z-level. If no z-level was specified, world.maxz will be increased so as to fit the map. Note that if you wish to load a map onto a z-level that already has objects on it, you will have to handle the removal of those objects. Otherwise the new map will simply load the new objects on top of the old ones. Also note that all type paths specified in the .dmm file must exist in the world's code, and that the /dmm_reader trusts that files to be loaded are in fact valid .dmm files. Errors in the .dmm format will cause runtime errors.