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41jl4 Rev. 2 U,P.NUMBER 4.3.3.4. ACTIVITY ACTIVATION (ER ACT$) Purpose: UNIVAC 1100 SERIES SYSTEMS Activates an activity which must have been previously named by the NAME$ request (see 4.3.3.2). Format: L AO,activity·name ER ACT$ Description: 4-10 PAGE REVISION PAGE The 36·bit name returned as a result of the NAME$ request is used to activate the activity. The requesting activity need not be a named activity. Prior to issuing the ACT$ request, the user must load register AO with the contents of a main storage location in which the name attached to the requested activity has been stored. If the activity being activated is already active it is flagged such that when it next executes a DACT$ request, it is automatically reactivated. 4.3.4. REAL TIME PROGRAM/ACTIVITY CONTROL 4.3.4.1. CHANGING PROGRAM/ACTIVITY TO REAL TIME STATUS (RT$) Purpose: Raises the status of a program to real time if the run's account number permits such action. The RT$ request also allows a real time activity to change its switching priority level within the real time class. Format: L,U AO,switching·priority·level ER RT$ Description: Real time status is provided for programs servicing communications lines. To allow for the time critical nature of these programs, a program/activity which is real time is afforded privileges which non real time programs/activities do not enjoy. Namely they: • have top priority for CPU switching and I/O; • are not swapped out of main storage; • have access to certain ER's, primarily the communications requests. The allowable switching priority (2 through 35) for each program's activities is controlled by account number. If a switching priority higher than that permitted is requested, the activity is placed in error mode. When the requesting activity currently has real time status, the ER is used only to control that activity switching priority. A program is considered real time when any of its activities acquire real time status. Because the program may not be swapped, an RT$ request from within a program causes it to be positioned in main storage in such a way so as to cause minimum impact on the total system. Additional RT$ requests from within the program do not cause such relocation.
<strong>4144</strong> Rev. 2 <strong>UP</strong>-NUMBER UNIVAC 11 0 0 SERIES SYSTEMS 4-11 4.3.4.2. REMOVAL OF PROGRAM/ACTIVITY REAL TIME STATUS (NRT$) Purpose: Reduces an activity/program from real time status. Format: ER NRT$ Description: PAGE REVISION PAGE The activity is returned to the original program type (batch or demand). A program retains real time status until all real time activities are reduced in status or terminated, at which time the program also returns to its initial type. 4.3.5. TIMED ACTIVITY WAIT (TWAIT$) Purpose: Places the activity in a wait state (delays execution) for a specified period of time. Format: Description: L A 1 ,(wait-time-in-milliseconds) ER TWAIT$ The activity must load register AI with the desired wait time period to making the TWAIT$ request. This value has the same meaning as the wait time for the TFORK$ request (see 4.3.1.2). 4.4. CONDITION WORD CONTROL The program condition word which contains program status information supplied by the executive and information inserted by user-supplied control statements can also be modified dynamically from within an executing program. A complete description of the format and content of the condition word can be found in 3.9.4. 4.4.1. SETTING THE CONDITION WORD (SETC$) Purpose: Dynamically sets T3 of the program condition word. Format: Description: L,U AD,value ER SETC$ This ER transfers T3 of register AD to T3 of the condition word. The intital contents of T3 of the condition word are D. This ER performs a function similar to the @SETC control statement which sets T2 of the condition word (see 3.9.4).
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