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-.TH RENDEZVOUS 3
-.SH NAME
-rendezvous \- user level process synchronization
-.SH SYNOPSIS
-.B #include <u.h>
-.br
-.B #include <libc.h>
-.PP
-.B
-ulong rendezvous(ulong tag, ulong value)
-.SH DESCRIPTION
-The rendezvous system call allows two processes to synchronize and
-exchange a value.
-In conjunction with the shared memory system calls
-(see
-.IR segattach (3)
-and
-.IR fork (3)),
-it enables parallel programs to control their scheduling.
-.PP
-Two processes wishing to synchronize call
-.I rendezvous
-with a common
-.IR 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
-.I value
-arguments are exchanged between the processes and returned
-as the result of the respective
-.I rendezvous
-system calls.
-Both processes are awakened when
-the rendezvous succeeds.
-.PP
-The set of tag values which two processes may use to rendezvous\(emtheir tag space\(emis
-inherited when a process forks, unless
-.B RFREND
-is set in the argument to
-.BR rfork ;
-see
-.IR fork (3).
-.PP
-If a rendezvous is interrupted the return value is
-.BR ~0 ,
-so that value should not be used in normal communication.
-.SH SOURCE
-.B /usr/local/plan9/src/libc/9syscall
-.SH SEE ALSO
-.IR segattach (3),
-.IR fork (3)
-.SH DIAGNOSTICS
-Sets
-.IR errstr .