A process that requires exclusive use of several shared resources at once can use a multiple wait (muxwait) semaphore to obtain ownership of all the mutex semaphores protecting the shared resources. A process can also use a muxwait semaphore to wait on a group of event semaphores so that the process continues running whenever events of interest occur.
A muxwait semaphore can refer to up to 64 event or mutex semaphores. An application cannot refer to event and mutex semaphores in a single muxwait semaphore, or include a muxwait semaphore in another muxwait semaphore.