1. A system for input/output (I/O) synchronization in a high-integrity multicore processing environment (MCPE), comprising: at least one logical processing unit (LPU) comprising a plurality of homogeneous processing cores, each homogeneous processing core associated with at least one of a guest operating system (GOS) and a user application configured to execute on the homogeneous processing core, each GOS configured to concurrently: forward at least one input dataset to the at least one user application; receive at least one output dataset from the at least one user application; and load the received output dataset into an output I/O synchronization (IOS) channel; at least one I/O synchronization engine (IOSE) connected to the at least one LPU and comprising the at least one output IOS channel and at least one input IOS channel, the IOSE configured to: execute at least one verification of the at least one loaded output dataset; return at least one successful verification by selecting a final output dataset from the at least one loaded output dataset; route the final output dataset to at least one of an external processing core and a network connected to the MCPE; receive the at least one input dataset from the at least one of the external processing core and the network; generate at least one synchronous input by atomically replicating the at least one input dataset into the at least one input IOS channel; and concurrently transfer the at least one synchronous input to the at least one GOS via the at least one input IOS channel; and at least one hypervisor coupled to the at least one LPU and configured to synchronize the receipt of the at least one output dataset by the at least one GOS.