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RENDEZVOUS(2) System Calls Manual RENDEZVOUS(2)
rendezvous - user level process synchronization
void* rendezvous(void* tag, void* value)
The rendezvous system call allows two processes to synchronize and
exchange a value. In conjunction with the shared memory system calls
(see segattach(2) and fork(2)), it enables parallel programs to control
Two processes wishing to synchronize call rendezvous with a common tag,
typically an address in memory they share. One process will arrive at
the rendezvous first; it suspends execution until a second arrives.
When a second process meets the rendezvous the value arguments are
exchanged between the processes and returned as the result of the
respective rendezvous system calls. Both processes are awakened when
the rendezvous succeeds.
The set of tag values which two processes may use to rendezvous—their
tag space—is inherited when a process forks, unless RFREND is set in
the argument to rfork; see fork(2).
If a rendezvous is interrupted the return value is ~0, so that value
should not be used in normal communication.
fork(2), lock(2), segattach(2)