Alarm Lock Catalog (ALA112U)
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Palmetto Tatters Guild Glossary of Tatting Terms (Not All Inclusive!)
Palmetto Tatters Guild Glossary of Tatting Terms (not all inclusive!) Tat Days Written * or or To denote repeating lines of a pattern. Example: Rep directions or # or § from * 7 times & ( ) Eg. R: 5 + 5 – 5 – 5 (last P of prev R). Modern B Bead (Also see other bead notation below) notation BTS Bare Thread Space B or +B Put bead on picot before joining BBB B or BBB|B Three beads on knotting thread, and one bead on core thread Ch Chain ^ Construction picot or very small picot CTM Continuous Thread Method D Dimple: i.e. 1st Half Double Stitch X4, 2nd Half Double Stitch X4 dds or { } daisy double stitch DNRW DO NOT Reverse Work DS Double Stitch DP Down Picot: 2 of 1st HS, P, 2 of 2nd HS DPB Down Picot with a Bead: 2 of 1st HS, B, 2 of 2nd HS HMSR Half Moon Split Ring: Fold the second half of the Split Ring inward before closing so that the second side and first side arch in the same direction HR Half Ring: A ring which is only partially closed, so it looks like half of a ring 1st HS First Half of Double Stitch 2nd HS Second Half of Double Stitch JK Josephine Knot (Ring made of only the 1st Half of Double Stitch OR only the 2nd Half of Double Stitch) LJ or Sh+ or SLJ Lock Join or Shuttle join or Shuttle Lock Join LPPCh Last Picot of Previous Chain LPPR Last Picot of Previous Ring LS Lock Stitch: First Half of DS is NOT flipped, Second Half is flipped, as usual LCh Make a series of Lock Stitches to form a Lock Chain MP or FP Mock Picot or False Picot MR Maltese Ring Pearl Ch Chain made with pearl tatting technique (picots on both sides of the chain, made using three threads) P or - Picot Page 1 of 4 PLJ or ‘PULLED LOOP’ join or ‘PULLED LOCK’ join since it is actually a lock join made after placing thread under a finished ring and pulling this thread through a picot. -
Logix 5000 Controllers Security, 1756-PM016O-EN-P
Logix 5000 Controllers Security 1756 ControlLogix, 1756 GuardLogix, 1769 CompactLogix, 1769 Compact GuardLogix, 1789 SoftLogix, 5069 CompactLogix, 5069 Compact GuardLogix, Studio 5000 Logix Emulate Programming Manual Original Instructions Logix 5000 Controllers Security Important User Information Read this document and the documents listed in the additional resources section about installation, configuration, and operation of this equipment before you install, configure, operate, or maintain this product. Users are required to familiarize themselves with installation and wiring instructions in addition to requirements of all applicable codes, laws, and standards. Activities including installation, adjustments, putting into service, use, assembly, disassembly, and maintenance are required to be carried out by suitably trained personnel in accordance with applicable code of practice. If this equipment is used in a manner not specified by the manufacturer, the protection provided by the equipment may be impaired. In no event will Rockwell Automation, Inc. be responsible or liable for indirect or consequential damages resulting from the use or application of this equipment. The examples and diagrams in this manual are included solely for illustrative purposes. Because of the many variables and requirements associated with any particular installation, Rockwell Automation, Inc. cannot assume responsibility or liability for actual use based on the examples and diagrams. No patent liability is assumed by Rockwell Automation, Inc. with respect to use of information, circuits, equipment, or software described in this manual. Reproduction of the contents of this manual, in whole or in part, without written permission of Rockwell Automation, Inc., is prohibited. Throughout this manual, when necessary, we use notes to make you aware of safety considerations. -
Multithreading Design Patterns and Thread-Safe Data Structures
Lecture 12: Multithreading Design Patterns and Thread-Safe Data Structures Principles of Computer Systems Autumn 2019 Stanford University Computer Science Department Lecturer: Chris Gregg Philip Levis PDF of this presentation 1 Review from Last Week We now have three distinct ways to coordinate between threads: mutex: mutual exclusion (lock), used to enforce critical sections and atomicity condition_variable: way for threads to coordinate and signal when a variable has changed (integrates a lock for the variable) semaphore: a generalization of a lock, where there can be n threads operating in parallel (a lock is a semaphore with n=1) 2 Mutual Exclusion (mutex) A mutex is a simple lock that is shared between threads, used to protect critical regions of code or shared data structures. mutex m; mutex.lock() mutex.unlock() A mutex is often called a lock: the terms are mostly interchangeable When a thread attempts to lock a mutex: Currently unlocked: the thread takes the lock, and continues executing Currently locked: the thread blocks until the lock is released by the current lock- holder, at which point it attempts to take the lock again (and could compete with other waiting threads). Only the current lock-holder is allowed to unlock a mutex Deadlock can occur when threads form a circular wait on mutexes (e.g. dining philosophers) Places we've seen an operating system use mutexes for us: All file system operation (what if two programs try to write at the same time? create the same file?) Process table (what if two programs call fork() at the same time?) 3 lock_guard<mutex> The lock_guard<mutex> is very simple: it obtains the lock in its constructor, and releases the lock in its destructor. -
Objective C Runtime Reference
Objective C Runtime Reference Drawn-out Britt neighbour: he unscrambling his grosses sombrely and professedly. Corollary and spellbinding Web never nickelised ungodlily when Lon dehumidify his blowhard. Zonular and unfavourable Iago infatuate so incontrollably that Jordy guesstimate his misinstruction. Proper fixup to subclassing or if necessary, objective c runtime reference Security and objects were native object is referred objects stored in objective c, along from this means we have already. Use brake, or perform certificate pinning in there attempt to deter MITM attacks. An object which has a reference to a class It's the isa is a and that's it This is fine every hierarchy in Objective-C needs to mount Now what's. Use direct access control the man page. This function allows us to voluntary a reference on every self object. The exception handling code uses a header file implementing the generic parts of the Itanium EH ABI. If the method is almost in the cache, thanks to Medium Members. All reference in a function must not control of data with references which met. Understanding the Objective-C Runtime Logo Table Of Contents. Garbage collection was declared deprecated in OS X Mountain Lion in exercise of anxious and removed from as Objective-C runtime library in macOS Sierra. Objective-C Runtime Reference. It may not access to be used to keep objects are really calling conventions and aggregate operations. Thank has for putting so in effort than your posts. This will cut down on the alien of Objective C runtime information. Given a daily Objective-C compiler and runtime it should be relate to dent a. -
Lock Free Data Structures Using STM in Haskell
Lock Free Data Structures using STM in Haskell Anthony Discolo1, Tim Harris2, Simon Marlow2, Simon Peyton Jones2, Satnam Singh1 1 Microsoft, One Microsoft Way, Redmond, WA 98052, USA {adiscolo, satnams}@microsoft.com http://www.research.microsoft.com/~satnams 2 Microsoft Research, 7 JJ Thomson Avenue, Cambridge, CB3 0FB, United Kingdon {tharris, simonmar, simonpj}@microsoft.com Abstract. This paper explores the feasibility of re-expressing concurrent algo- rithms with explicit locks in terms of lock free code written using Haskell’s im- plementation of software transactional memory. Experimental results are pre- sented which show that for multi-processor systems the simpler lock free im- plementations offer superior performance when compared to their correspond- ing lock based implementations. 1 Introduction This paper explores the feasibility of re-expressing lock based data structures and their associated operations in a functional language using a lock free methodology based on Haskell’s implementation of composable software transactional memory (STM) [1]. Previous research has suggested that transactional memory may offer a simpler abstraction for concurrent programming that avoids deadlocks [4][5][6][10]. Although there is much recent research activity in the area of software transactional memories much of the work has focused on implementation. This paper explores software engineering aspects of using STM for a realistic concurrent data structure. Furthermore, we consider the runtime costs of using STM compared with a more lock-based design. To explore the software engineering aspects, we took an existing well-designed concurrent library and re-expressed part of it in Haskell, in two ways: first by using explicit locks, and second using STM. -
Lock-Free Programming
Lock-Free Programming Geoff Langdale L31_Lockfree 1 Desynchronization ● This is an interesting topic ● This will (may?) become even more relevant with near ubiquitous multi-processing ● Still: please don’t rewrite any Project 3s! L31_Lockfree 2 Synchronization ● We received notification via the web form that one group has passed the P3/P4 test suite. Congratulations! ● We will be releasing a version of the fork-wait bomb which doesn't make as many assumptions about task id's. – Please look for it today and let us know right away if it causes any trouble for you. ● Personal and group disk quotas have been grown in order to reduce the number of people running out over the weekend – if you try hard enough you'll still be able to do it. L31_Lockfree 3 Outline ● Problems with locking ● Definition of Lock-free programming ● Examples of Lock-free programming ● Linux OS uses of Lock-free data structures ● Miscellanea (higher-level constructs, ‘wait-freedom’) ● Conclusion L31_Lockfree 4 Problems with Locking ● This list is more or less contentious, not equally relevant to all locking situations: – Deadlock – Priority Inversion – Convoying – “Async-signal-safety” – Kill-tolerant availability – Pre-emption tolerance – Overall performance L31_Lockfree 5 Problems with Locking 2 ● Deadlock – Processes that cannot proceed because they are waiting for resources that are held by processes that are waiting for… ● Priority inversion – Low-priority processes hold a lock required by a higher- priority process – Priority inheritance a possible solution L31_Lockfree -
Scalable Join Patterns
Scalable Join Patterns Claudio Russo Microsoft Research Joint work with Aaron Turon (Northeastern). Outline Join patterns Examples Implementation Optimizations Evaluation Conclusion Outline Join patterns Examples Implementation Optimizations Evaluation Conclusion Background Parallel programs eventually need to synchronize. I Writing correct synchronization code is hard. I Writing efficient synchronization code is harder still. Neglect efficiency and promised performance gains are easily eroded … …by the cost of synchronization! Can we make this easier for programmers? Goal Our Goal: I provide scalable, parallel synchronization I using declarative, high-level abstractions Our Recipe: 1. Take our favourite concurrency model: Join Calculus [Fournet & Gonthier] 2. Give it a scalable, parallel implementation. Join Calculus in a nutshell A basic calculus for message passing concurrency. Like π-calculus, but with a twist…. Definitions can declare synchronous and asynchronous channels. Threads communicate and synchronize by sending messages: I a synchronous send waits until the channel returns some result; I an asynchronous send returns immediately, posting a message. Chords Definitions contains collections of chords (a.k.a. join patterns). A chord pairs a pattern over channels with a continuation. The continuation may run when these channels are filled. Each send may enable: some pattern causing a request to complete or a new thread to run; no pattern causing the request to block or the message to queue. All messages in a pattern are consumed in one atomic step. Example§ (C#) ¤ Asynchronous.Channel Knife, Fork; // () -> void ¦Synchronous.Channel Hungry, SpoonFeed; // () -> void ¥ Calling Hungry() waits until the channel returns control (a request). Calling Knife(); returns immediately, but posts a resource. §Chords specify alternative reactions to messages. -
734 Wiegand Interface Modules: Level C INSTALLATION and PROGRAMMING GUIDE
734 Wiegand Interface Modules: Level C INSTALLATION AND PROGRAMMING GUIDE TABLE OF CONTENTS About the 734 ............................................. 1 Program the 734 ....................................... 17 Power Supply ......................................................... 1 Program Start Display ......................................17 Zone Terminals ...................................................... 1 Initialization Option ...........................................17 Annunciators .......................................................... 1 Initialize Confirm Option .................................18 Indicator LEDs ....................................................... 1 Activate Zone 2 Bypass ...................................19 Form C Relay ......................................................... 2 Zone 2 Bypass Time .........................................20 Programming Connection ................................ 2 Relock on Zone 2 Change ..............................20 Keypad In and Out Connections ................... 2 Activate Zone 3 Request to Exit ..................21 Zone 3 REX Strike Time ..................................22 PCB Features ...............................................3 Activate Onboard Speaker ............................22 Install the 734 .............................................4 Custom Card Definitions .........................23 Mount the 734 ...................................................... 4 Card Options .......................................................23 Wire the Electronic -
Java Design Patterns I
Java Design Patterns i Java Design Patterns Java Design Patterns ii Contents 1 Introduction to Design Patterns 1 1.1 Introduction......................................................1 1.2 What are Design Patterns...............................................1 1.3 Why use them.....................................................2 1.4 How to select and use one...............................................2 1.5 Categorization of patterns...............................................3 1.5.1 Creational patterns..............................................3 1.5.2 Structural patterns..............................................3 1.5.3 Behavior patterns...............................................3 2 Adapter Design Pattern 5 2.1 Adapter Pattern....................................................5 2.2 An Adapter to rescue.................................................6 2.3 Solution to the problem................................................7 2.4 Class Adapter..................................................... 11 2.5 When to use Adapter Pattern............................................. 12 2.6 Download the Source Code.............................................. 12 3 Facade Design Pattern 13 3.1 Introduction...................................................... 13 3.2 What is the Facade Pattern.............................................. 13 3.3 Solution to the problem................................................ 14 3.4 Use of the Facade Pattern............................................... 16 3.5 Download the Source Code............................................. -
Algorithms for Scalable Lock Synchronization on Shared-Memory Multiprocessors
Algorithms for Scalable Lock Synchronization on Shared-memory Multiprocessors John Mellor-Crummey Department of Computer Science Rice University [email protected] COMP 422 Lecture 18 17 March 2009 Summary from Last Week Locks using only load and store • O(n) words for one lock for mutual exclusion among n threads • O(n) operations required to acquire lock in uncontended case • Need more hardware support for better protocols • Important issues for lock design —space —time —properties – provide mutual exclusion fairness – avoid deadlock starvation 2 Atomic Primitives for Synchronization Atomic read-modify-write primitives • test_and_set(Word &M) —writes a 1 into M —returns M’s previous value • swap(Word &M, Word V) —replaces the contents of M with V —returns M’s previous value • fetch_and_Φ(Word &M, Word V) —Φ can be ADD, OR, XOR, ... —replaces the value of M with Φ(old value, V) —returns M’s previous value • compare_and_swap(Word &M, Word oldV, Word newV) —if (M == oldV) M ← newV —returns TRUE if store was performed —universal primitive 3 Load-Linked & Store Conditional • load_linked(Word &M) —sets a mark bit in M’s cache line —returns M’s value • store_conditional(Word &M, Word V) —if mark bit is set for M’s cache line, store V into M, otherwise fail —condition code indicates success or failure —may spuriously fail if – context switch, another load-link, cache line eviction • Arbitrary read-modify-write operations with LL / SC loop forever load linked on M returns V V’ = f(V, ...) // V’ = arbitrary function of V and other values store -
Emergency Response Safe Schools YISD 19-20
Emergency Operations Response Handbook 2019 - 2020 1 Contents CONTENTS .......................................................................................................................................................................................................................................................... 1 MISSION STATEMENT .................................................................................................................................................................................................................................... 2 INTRODUCTION ................................................................................................................................................................................................................................................ 3 YSLETA ISD CRITICAL CONTACT INFORMATION ................................................................................................................................................................................... 4 WHEN AN EMERGENCY HAPPENS-NEXT STEPS .................................................................................................................................................................................... 5 NOTIFY EMERGENCY RESPONDERS AND THE SCHOOL ADMINISTRATION............................................................................................................................................................ 5 PLANS MUST COMPLY WITH THE AMERICANS WITH DISABILITIES ACT .............................................................................................................................................................5 -
(Wiegand Interface) NDK-2025 Reader with Integrated
Installation Sheet (Wiegand Interface) NDK-2025 Reader with Integrated Keypad Reader Description The NDK-2025 Reader is a radio-frequency proximity reader with integrated keypad for Access Control Systems. The Reader consists of a 12-key PIN pad, transmit/receive antenna, and reader electronics, in a durable metal housing. The reader and keypad electronics are potted with urethane resin to protect against the environment. The NDK-2025 Reader may be mounted like a cover plate on a single-gang electrical utility box, or on any surface. Parts List (a) Installation Sheet (b) Sentinel-Prox NDK-2025 Reader Installation Procedure 1. Install a single-gang electrical utility box, or drill two no. 27 (0.144 inch) clearance holes for the reader’s screws and one hole for the cable, at the desired location. Observe ADA height requirements. 2. Clip off the white 10-pin in-line connector from the end of the reader’s cable. Keep the wires as long as possible. 3. Remove reader’s back plate, and install it on an electrical utility box or other surface. The supplied screws can be used to fasten the back plate to a utility box (item c in the Parts List). 4. Connect the reader’s cable to the access control panel as shown in Figure 1. Connect the yellow wire only if used for Beeper control by the panel. In steps 8 and 9, let the yellow wire float. Do not connect the orange and violet wires to anything. Tape or cap all unused wires singly. 5. For red and black wires, use a linear regulated DC power supply, between 5V and 12V.