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Topic: Monitor (synchronization)


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In the News (Wed 17 Jul 19)

  
  Monitor - Wikipedia, the free encyclopedia
A monitor is a type of ship based on the USS Monitor and built by several navies for coastal defence in the 1860s and 1870s.
Monitor is a British organisation that regulates the NHS Foundation Trusts.
Monitor lizards are a family of large tropical lizards (Varanidae).
en.wikipedia.org /wiki/Monitor   (436 words)

  
 Monitor (synchronization) - Wikipedia, the free encyclopedia
A monitor is an approach to synchronizing two or more computer tasks that use a shared resource, usually a hardware device or a set of variables.
In early monitor implementations, notifying a condition variable caused a waiting process to receive the lock and run immediately, thereby guaranteeing that the condition would still be true.
C# does not have monitors as a feature of the language, although the.NET framework has a class that facilitates implementation of Java-style monitors by hand.
en.wikipedia.org /wiki/Monitor_(synchronization)   (548 words)

  
 [No title]
Monitors were chosen for the simulation, because of the emergence of the Java language, which uses monitor concepts for its synchronization.
A monitor is a synchronization construct that enforces mutual exclusion.
The behavior of the monitor is determined by the relative priorities and queue disciplines of the three monitor queues.
vip.cs.utsa.edu /nsf/pubs/starving/starving.html   (3344 words)

  
 Performance monitor synchronization in a multiprocessor system - US Patent 6480966   (Site not responding. Last check: 2007-11-02)
Monitoring the performance of multiprocessor systems through the use of the timestamp and the performance counter facilities is difficult unless the performance monitors of each processor in the system are synchronized (i.e., simultaneously reset or set to a known value).
Synchronization ensures that the timestamp register and performance counters of each processor are measuring events that occur in the same period of time.
In one embodiment, the values set in the lead processor performance monitors are offset from the value set in the slave processor performance monitors, preferably by an offset that is indicative of the delay required for the synchronization signal to propagate from the lead processor to the slave processor.
www.patentstorm.us /patents/6480966.html   (3951 words)

  
 Method for detecting a number of consecutive valid data frames and advancing into a lock mode to monitor ...   (Site not responding. Last check: 2007-11-02)
Frame synchronization data is transferred to the memory buffer module 32 and a frame synchronization completion command is input to the VME module 34.
When those synchronization words are identified with the predetermined number of bits or less in error in the synchronization window, then the sequence advances to the fly wheel mode 118 to again monitor for synchronization patterns falling within a synchronization window.
The frame synchronization module 122 transfers data on line 123 to a DRAM buffer 128 that is the primary element for transfer of data in the memory buffer module 32.
www.patentstorm.us /patents/6643788.html   (4048 words)

  
 Motor monitor synchronization system - Patent 4716351
A magnetic field motor monitor as claimed in claim 1 wherein said means for controlling the frequency of the clock source is arranged to alter the clock frequency in a direction which tends to reduce variations of the frequency of the source of clock pulses relative to that of the periodic external signal.
A magnetic field motor monitor as claimed in claim 1 wherein said means for detecting a fixed phase of said periodic external signal detects the zero crossing of the periodic external signal, and said time difference is determined between the occurrence of said timing signal and the detected zero crossing of the periodic external signal.
It is known to use a phase-locked loop to synchronise digital circuitry to an external signal but, particularly when there is a large ratio between the operating frequency of the digital circuitry and that to which the circuitry is to be synchronised, the cost of the synchronisation circuit is high.
www.freepatentsonline.com /4716351.html   (1793 words)

  
 Synchronizing Execution and Resolving Contention   (Site not responding. Last check: 2007-11-02)
Alternatively, one of the synchronization primitives (such as a mutex) can be locked in the calling program just before the called program is entered and then unlocked when the called program has returned.
A solution to this problem would be given by a synchronization primitive that enabled multiple threads to be active in read-only critical sections but prevented any other access when a thread is active in a write-critical section; such a synchronization primitive is the monitor.
A semaphore is a synchronization primitive that acts like a gate that lowers to prevent passage of a thread through code and raises to enable passage (of another thread) through that code.
www.emunix.emich.edu /info/cobol/books/mtsync.htm   (2794 words)

  
 MONITORs in Concurrent Programming
Monitors provide a structured concurrent programming primitive, which is used by processes to ensure exclusive access to resources, and for synchronizing and communicating among users.
To synchronize tasks within the monitor, a condition variable is used to delay processes executing in a monitor.
In addition, a monitor solution is more structured than the one with semaphores because the data and procedures are encapsulated in a single module and that the mutual exclusion is provided automatically by the implementation.
ei.cs.vt.edu /~cs5204/sp99/monitor.html   (1268 words)

  
 [No title]
These errors, called synchronization errors, are caused when multiple threads attempt to access the same shared resource at the same time.
Monitor offers the advantages of being simple, flexible enough to operate on blocks of code rather than entire classes or methods, and fast compared to other alternatives.
Second, if one thread is suspended at the entrance to a Monitor block that was set by another thread that has subsequently been suspended at the entrance to a Monitor block set by the first thread, both threads will be suspended indefinitely, each waiting for the other to release it.
builder.com.com /5102-6373-1061643.html   (1011 words)

  
 Facts about topic: (Monitor (synchronization))   (Site not responding. Last check: 2007-11-02)
As a simple example, consider a monitor for performing transactions on a bank account (A fund that a customer has entrusted to a bank and from which they can make withdrawals).
This makes monitors safer and more reliable than approaches that require the programmer to insert locking and unlocking operations by hand, since the programmer can forget them.
C# (additional info and facts about C#) does not have monitors as a feature of the language, although the.NET (additional info and facts about.NET) framework has a class that facilitates implementation of Java-style monitors by hand.
www.absoluteastronomy.com /encyclopedia/m/mo/monitor_(synchronization).htm   (744 words)

  
 Library Routines for Multi-threading
Synchronization objects are named, and the name is visible throughout the system, not just in the creating process.
A monitor is a synchronization object which can be locked for read, browse, and write operations.
A synchronization object was still locked upon thread termination and when the thread was created the program requested an error to be reported if this condition occurred.
www.emunix.emich.edu /info/cobol/books/mtcblr.htm   (5821 words)

  
 Thread Synchronization and the Java Monitor
A monitor region is code that needs to be executed as one indivisible operation with respect to a particular monitor.
The kind of monitor used in the Java virtual machine is sometimes called a Signal and Continue monitor because after a thread does a notify (the signal) it retains ownership of the monitor and continues executing the monitor region (the continue).
If no thread currently owns the monitor and no other threads are waiting in the entry set, the thread passes immediately through the next door, door number two, and becomes the owner of the monitor.
www.artima.com /insidejvm/ed2/threadsynch.html   (2449 words)

  
 java.net: Java Tech: The ABCs of Synchronization, Part 1
But if a thread is already inside of the monitor, the monitor makes the calling thread wait outside of the monitor until the other thread leaves the monitor.
A synchronized method is a method that serves as a monitor entry.
In contrast to the synchronized method, a synchronized statement is a monitor entry with a (usually) smaller critical section.
today.java.net /pub/a/today/2004/08/02/sync1.html   (1441 words)

  
 Nachos - Synchronization
The representation of a monitor type consists of declarations of variables whose values define the state of an instance of the type, as well as the bodies of procedures or functions that implement operations on the type.
Only one process may be executing in the monitor at a time; any other process that has invoked the monitor is suspended, waiting for the monitor to become available.
A monitor supports synchronization by the use of condition variables that are contained within the monitor and accessible only within the monitor.
www.cs.odu.edu /~cs471/soumya/synch.html   (864 words)

  
 Documentation
In the power-off state, the power consumption of the monitor is less than 5 W. The only way to isolate the monitor completely from the main supply is to unplug the main lead.
The monitor's power switch is turned off or the monitor is disconnected from the main outlet.
If color defect is repeated without the monitor having been moved, it is possible that the monitor is influenced by a strong electric interference field.
support.dell.com /support/edocs/dta/99047/00000005.htm   (671 words)

  
 Concurrent Programming Using the Java Language
Monitors also have condition variables, on which a thread can wait if conditions are not right for it to continue executing in the monitor.
In the former, a signaling thread must leave the monitor immediately, at which point it is guaranteed that the signaled thread is the next one in the monitor.
In contrast to named condition variables, it is not possible with this notification technique to wait in the middle of a monitor service method for a signal and then continue executing inside the monitor service method at that point after receiving the signal.
www.mcs.drexel.edu /~shartley/ConcProgJava/monitors.html   (1185 words)

  
 Microsoft Monitor: Microsoft In Synch   (Site not responding. Last check: 2007-11-02)
The Microsoft Monitor Weblog is a companion to Jupiter's Microsoft Monitor Research Service and provides additional news, analysis and insight relevant to the areas most important for Microsoft's growth in both the business and consumer marketplaces.
Synchronization is an essential technology to achieving this goal.
Synchronization would be an excellent technology to expose to developers.
www.microsoftmonitor.com /archives/002140.html   (767 words)

  
 Chapter 1 Understanding the Product
Synchronizing passwords allows users to access applications using these directory sources for login authentication so they only have to remember a single password.
Identity Synchronization for Windows uses Message Queue (a persistent message queue mechanism with a publish/subscribe model) to propagate attribute and password changes between directory sources and to distribute administrative and configuration information to the connectors managing synchronization for those directory sources.
Figure 1-9 illustrates the synchronization requirements (node structures with associated attribute values) used for this deployment scenario.
docs.sun.com /source/817-6199/Ch1_Overview.html   (3619 words)

  
 [No title]
Then, when a method is called to synchronize access to the object, the CLR finds a free SyncBlock in its cache and sets the object's SyncBlockIndex to refer to the SyncBlock.
When no more threads are synchronizing access to the object, the object's SyncBlockIndex is reset to a negative number, and the SyncBlock is free to be associated with another object in the future.
Monitor's Enter and Exit methods require a reference to an object on the heap.
msdn.microsoft.com /msdnmag/issues/03/01/NET   (2868 words)

  
 [No title]
TimeWatch is designed to allow telecommunication network operators to effectively monitor the quality of network synchronization of many hundreds of links, 24 hours a day, 365 days a year.
High quality timing and synchronization is an essential infrastructure component for the reliable transmission of voice, video and data in next-generation networks.
The architecture consists of “probes” that are deployed at sites requiring synchronization monitoring and a server that performs fault, configuration and performance management functions.
www.symmetricom.com /About_Us/News/Press_Releases/Nov_01_2004.htm   (406 words)

  
 Chapter 7 -- Concurrency and Synchronization   (Site not responding. Last check: 2007-11-02)
Java monitors have no official standing in the language specification, and their implementation is not directly visible to the programmer.
It may be possible to access a Java monitor at the native code level, but this is not recommended (and it is beyond the scope of this chapter).
Monitors themselves may be simple, but taken together with the rest of the programming environment, there are many issues you should understand in order to use monitors optimally.
docs.rinet.ru:8080 /JaTricks/ch7.htm   (6338 words)

  
 Microsoft Monitor: Playsforsure Means Good Synchronization   (Site not responding. Last check: 2007-11-02)
The JupiterResearch report, "Synchronization: The Missing Links" explains why the feature is so important.
Microsoft's own store, which content proved the least troublesome synchronizing to the music players, requires the user to re-enter a MSN Music account name and password before the songs will play on other PCs.
They are quite visible from the other stores, whether during synchronization or transfer to another computer.
www.microsoftmonitor.com /archives/005506.html   (751 words)

  
 Log Shipping Monitor out-of-synchronization messages are incorrectly raised in an outage period in Microsoft SQL Server ...
Log Shipping Monitor out-of-synchronization messages are incorrectly raised in an outage period in Microsoft SQL Server 2000 Enterprise Edition
Log Shipping Monitor out-of-synchronization messages are incorrectly raised in an outage period.
When you specify an outage period to suppress Log Shipping Monitor out-of-synchronization messages, out-of-synchronization messages may still be raised in that outage period.
support.microsoft.com /default.aspx?scid=kb;en-us;311177   (433 words)

  
 AAR Software Ltd.
is a powerful data replication, backup and synchronization software...
is a file monitoring and data replication software for home networks...
allows users to monitor events recorded in the Application, Security, System logs...
www.aarsoftware.com   (84 words)

  
 macosxhints - Enable external monitor support on a newer iBook
There is already a hack to enable full external monitor support (not just mirroring) on iBooks with ATI Radeon chips.
Afterwards, un-check the checkbox 'Monitor Synchronization' in the preferences and there you go.
Also, the first script just installs the monitor thing; the second extends the monitor and makes the computer be able to stay asleep with the lid closed.
www.macosxhints.com /article.php?story=20030727112641398   (1667 words)

  
 Replication and monitoring solutions
is a complete solution for real time replication, backup, synchronization and mirroring via LAN, WAN and Internet for system administrators, mobile users and all those who need to keep data up-to-date in different places.
Ascella Log Monitor Plus for Windows® NT4/2000/XP Windows® (NT4/2000/XP) has a special system that tracks down the most events on your computer.
As a rule we do not pay attention to it, but it contains very important information that helps to prevent possible software and hardware errors and crushes.
www.file-monitor.com   (254 words)

  
 Foundry extends server, security pack
Also included is a connection rate-limiting feature for capping the number of sessions a firewall or Web server can accept to avoid device overload and failure - such as increased e-commerce traffic at Christmas or spiking traffic to an accounting server during a businesses' end-of-quarter finance closings.
SYN Guard goes further by acting as a proxy for a Web server, requiring that the entire TCP/IP handshake occur between the switch and a client before letting the connection be processed by the server.
The switch monitors for unfulfilled SYN packets, Foundry says, ensuring that a server is shielded from SYN flood attacks - even distributed denial-of-service attacks, which could have overwhelmed sites using SYN Defense.
www.networkworld.com /archive/2001/124929_09-10-2001.html   (689 words)

  
 NOVELL: Cool Solutions: Using NTPQ to Monitor NTP Synchronization
I have configured NTPv3 for my NetWare 6.5 boxes, but I am unable to monitor the progress of synchronization.
"o" selected for synchronization, PPS signal in use.
This can be for various reasons, the most common reasons are "time provider not synchronized", "configured source does not exist" or "ntp server not running".
www.novell.com /coolsolutions/trench/418.html   (491 words)

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