**CIGAL Reference Manual, Chapter 6 (RealTime): r_wait**
===== r_wait -- Wait until a specified time =====
**usage: r_wait   opflg eflag ltime TimeVal Flag**

Wait until time TIMEVAL.  This command makes it possible to control the
timing of a program based on time intervals stored in a data variable.
Whereas the LTIME argument for most REALTIME commands is evaluated when
the realtime program is compiled (and is therefore treated as a constant),
the TIMEVAL argument to R_WAIT is evaluated at runtime and therefore can
take on different values at different times.

The FLAG argument can be used to make the specified TIMEVAL a relative
time, as follows:
      FLAG = 0   - time is relative to last R_RESET,or start of program
                   if no R_RESET (this is default)
             1   - time is relative to previous operation
             2   - time is relative to start of most recent R_REPEAT loop

For this command the value of the LTIME argument is ignored. HOWEVER,
specifying a LTIME argument that is preceded by a '+' (e.g. +0) causes
the TIMEVAL argument to be treated as a relative wait. This is treated
exactly the same as specifying FLAG=1.

**See Also:**\\
[[jvs:cigal|CIGAL Home]], 
[[jvs:cigal:manual|CIGAL Manual]], 
[[jvs:cigal:manual:chapter6|RealTime List]], 
[[jvs:cigal:manual:help|Manual Help]]