Maintaining concurrency and consistency of globally unique identifiers

A computer-implemented method comprising:

• receiving a request to modify a globally unique identifier associated with a content item in a content item management module, wherein the content item management module is a multi-user network-based content item management environment storing content items addressable by globally unique identifiers unique within the content item management environment, wherein the globally unique identifiers are associated, in an identifier database, with a content item, a storage location, and an authorized user having access to the content item, wherein copies of content items are maintained in at least one client device;
• acquiring a first mutex for a namespace associated with the content item;
• acquiring a second mutex for the globally unique identifier;
• modifying, via a processor, the globally unique identifier according to the request;
• releasing the first mutex and the second mutex;
• and
• providing a confirmation in response to the request.

A non-transitory computer-readable storage medium having stored therein instructions which, when executed by a processor, cause the processor to perform a method comprising:

• receiving, from a client device, a request to perform a content item operation in a content item management environment that affects a globally unique identifier, wherein the content item management environment is a multi-user network-based content item management environment storing content items addressable by globally unique identifiers unique within the content item management environment, wherein the globally unique identifiers are associated, in an identifier database, with a content item, a storage location, and an authorized user having access to the content item, wherein copies of content items are maintained in at least one client device;
• acquiring a first mutex for a namespace associated with the content item operation;
• acquiring a second mutex for the globally unique identifier;
• performing the content item operation according to the request;
• updating the globally unique identifier based on the content item operation;
• releasing the first mutex and the second mutex;
• and
• providing a confirmation to the client device in response to the request.