Memory Management Clause Samples

Memory Management. The code generation platform on which the C code generator is based was originally designed to target languages with implicit memory management, such as Java. In the context of C, this poses great difficulty in explicitly freeing allocated memory. For example, the VDM expression 1 + 2 + 3 , \z r translates to the following, independent of context: vdmSum( newInt ( 1 ) , vdmSum( newInt ( 2 ) , newInt ( 3 ) ) ) , \z r Because none of the intermediate values are assigned to TVP variables, none of the memory allocated here can be accessed and freed once the outer invo- cation of vdmSum() terminates. This is only a simple illustrative example of the difficulty in dealing with allocated memory explicitly. We solve this problem using a bespoke garbage collection (GC) strategy that is meant to obviate the need for explicit calls to vdmFree() anywhere in the generated code. All functions that allocate memory on the heap have corresponding GC-aware versions, such that intermediate values allocated as in the example above can be reclaimed in bulk with a call to the GC when it is known to be safe to do so. The garbage collector is kept simple by the specific structure of models in INTO-CPS. Due to the FMI approach of stepping simulations, an FMI step corresponds, in the VDM world, to one execution of a periodic task. It is known that all variables that are allocated during one execution either update class fields, which are not subject to garbage collection by design, or are otherwise intermediate. In this pattern of execution it is natural to invoke the garbage collector each time the periodic task has finished executing. The time and memory performance of this prototype garbage collection strat- egy has been summarily assessed using the VDM model shown in Listing 20. val : int ; public Co l la tz : int ==> Co l la tz Co l la tz ( v ) == val := v ; public run : ( ) ==> ( ) run () == i f val = 1 then return
View Source
Memory Management. The operating system shall provide state-of-the-art algorithms for management of virtual memory segments, cache memory, commonly accessible installed program images, and memory defragmentation.
View Source
Memory Management. Currently the code generator attempts to manage memory usage by emit- ting calls to vdmFree() based on the role of new TVP variables. The level of abstraction of VDM-RT from which the code generation process starts means that the strategies for freeing all allocated TVP values are difficult to implement. For example, the VDM expression 1 + 2 currently translates to the following, independent of context: vdmSum( newInt ( 1 ) , vdmSum( newInt ( 2 ) , newInt ( 3 ) ) ) Because none of the intermediate values are assigned to TVP variables, none of the memory allocated here can be accessed and freed once the outer invo- cation of vdmSum() terminates. This is only a simple illustrative example of the difficulty in dealing with allocated memory explicitly. Work is ongoing to implement memory freeing strategies such that memory allocated as in this example can be freed at the appropriate place with corresponding calls to vdmFree(). A parallel effort aims to develop a garbage collection strategy that is meant to obviate the need for explicit calls to vdmFree() anywhere in the generated code. All functions that allocate memory on the heap have been modified to accept the address of the memory location from which the allocated memory is referenced (a pointer to TVP). A table is kept recording the relationship between these two locations. When allocating intermediate memory as in the example above, a null pointer is passed indicating that this memory is safe to reclaim once the containing statement has finished executing. When the memory reclamation mechanism is executed, the value at each referencing location is checked against the corresponding address held in the allocation table. If these are not the same, then the memory in question can no longer be accessed from the corresponding location, and a call to vdmFree() is executed on it. If these values are the same then it is assumed that the reference is still in some scope, and therefore the memory referenced by it is still in use. The problem of variable scoping is handled based on the assumption that the evolution of the call stack will eventually overwrite local variables holding references to allocated memory. For example, assume that a function allocates a newInt() to variable ni. The variable ni is allocated on the call stack. The garbage collector is passed the address of ni through the call to newInt(). When the function exits, the stack pointer is modified such that the next function invocation will make us...
View Source

Related to Memory Management

  • Program Management 1.1.01 Implement and operate an Immunization Program as a Responsible Entity 1.1.02 Identify at least one individual to act as the program contact in the following areas: 1. Immunization Program Manager;

  • Traffic Management 9.2.1 During the Operating Period, Developer shall be responsible for the general management of traffic on the Project. Developer shall manage traffic so as to preserve and protect safety of traffic on the Project and Related Transportation Facilities and, to the maximum extent practicable, to avoid disruption, interruption or other adverse effects on traffic flow, throughput or level of service on the Project and Related Transportation Facilities. Developer shall conduct traffic management in accordance with all applicable Technical Provisions, Technical Documents, Laws and Governmental Approvals, and in accordance with the Traffic Management Plan. 9.2.2 Developer shall prepare and submit to TxDOT and the Independent Engineer for TxDOT approval a Traffic Management Plan for managing traffic on the Project and Related Transportation Facilities after the commencement of traffic operations on any portion of the Project, addressing (a) orderly and safe movement and diversion of traffic on Related Transportation Facilities during Project construction, (b) orderly and safe movement of traffic on the Project and (c) orderly and safe diversion of traffic on the Project and Related Transportation Facilities necessary in connection with field maintenance and repair work or Renewal Work or in response to Incidents, Emergencies and lane closures. Developer shall prepare the Traffic Management Plan according to the schedule set forth in the Technical Provisions. The Traffic Management Plan shall comply with the Technical Provisions and Technical Documents concerning traffic management and traffic operations. Developer shall carry out all traffic management during the Term in accordance with the approved Traffic Management Plan. 9.2.3 Developer shall implement the Traffic Management Plan to promote safe and efficient operation of the Project and Related Transportation Facilities at all times during the course of any construction or operation of the Project and during the Utility Adjustment Work. 9.2.4 TxDOT shall have at all times, without obligation or liability to Developer, the right 9.2.4.1 Issue Directive Letters to Developer regarding traffic management 9.2.4.2 Provide on the Project, via message signs or other means consistent with Good Industry Practice, non-Discriminatory traveler and driver information, and other public information (e.g. amber alerts), provided that the means to disseminate such information does not materially interfere with the functioning of the ETCS.

  • NETLINK MANAGEMENT PTE LTD. (in its capacity as trustee of NetLink Trust) (Company Registration Number: 201704784C), a company incorporated in Singapore with its registered address at ▇▇▇▇ ▇▇▇▇ ▇▇▇▇ Road, #07-03 Viva Business Park Singapore 469005 (“NLT”) AND

  • Inventory Management The Subrecipient must submit an annual statement identifying the status of all equipment and non-real property items purchased with ESG funds by the contract termination date. The status report should inventory all equipment and non-real properties purchased with ESG funds and state the condition of the equipment and its location.

  • General Management In the discharge of its general duty to manage the successful performance of the Services, Vendor shall: 3.2.1.1. within thirty (30) calendar days of the Effective Date, identify to Citizens the primary and secondary management contacts responsible for the oversight and management of Services for Citizens; 3.2.1.2. ensure Vendor Staff tasked with management and oversight of the Services are available promptly to perform Services during Business Hours; 3.2.1.3. ensure each assigned Adjuster submits a time record directly to Vendor’s manager or point of contact. At any time during this Agreement, Citizens may require copies of time records from Vendor; 3.2.1.4. ensure that no Vendor Staff carries a weapon on their person while performing Services; 3.2.1.5. ensure that no Vendor Staff uses impairing drugs, chemicals, or alcohol while performing Services; 3.2.1.6. ensure that Vendor Staff avoid using their duties and obligations under this Agreement to engage in any conduct that could create either an actual or perceived conflict of interest, such as due to an ongoing business relationship with an entity other than Citizens that would enable Vendor Staff to receive an improper benefit or unfair competitive advantage; 3.2.1.7. ensure that the Services comply with the Best Claims Practices & Estimating Guidelines as applicable to each Service Category and any other policies or processes set forth by Citizens, including but not limited to: a. monitoring applicable file production on a weekly basis to determine compliance with Citizens’ production requirements; and, b. providing detailed reports to Citizens related to Vendor performance upon request.