Systems, methods, and devices for queue availability monitoring

A system comprising:

• a first command queue;
• a second command queue;
• a register comprising a first portion to indicate, based at least in part on at least one doorbell indication, a first command for a protocol in the first command queue and a second portion to indicate, based at least in part on the at least one doorbell indication, a second command for the protocol in the second command queue;
• and
• a storage device comprising a processor configured to process the first command based on a status of the first portion of the register.

A method comprising:

• monitoring, at a device, a first command queue and a second command queue;
• modifying a first portion of a register based, at least in part, on at least one doorbell indication and a first command for a protocol in the first command queue;
• modifying a second portion of the register based, at least in part, on the at least one doorbell indication and a second command for the protocol in the second command queue;
• and
• processing, with a processor at the device, the first command based on a state of the first portion of the register.