A method, executed by a computer, for inter-process communication in a multi-tenant environment includes creating an advertisement file for each tenant, determining that a semaphore is greater than zero, searching for a response file, and decrementing the semaphore. Detecting the response file may enable the specific tenant to establish a connection with an attachment process, and as a result, the semaphore may be reset to a value of zero. In one embodiment, a plurality of synchronization files are locked prior to incrementing the semaphore and unlocked in response to detecting the response file. Another method includes counting the targets to provide a target count, incrementing a semaphore to the target count, creating a response file, and establishing a connection with the specific target. A computer program product and computer system corresponding to the methods are also disclosed herein.