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- Critical_section abstract "In concurrent programming, a critical section is a part of a multi-process program that may not be concurrently executed by more than one of the program's processes/threads; in other words, it is a piece of program that requires mutual exclusion of access. Typically, the critical section accesses a shared resource (data structure or device)A critical section may consist of multiple discontiguous parts of the program's code. For example, one part of a program might read from a file that another part wishes to modify. These parts together form a single critical section, since simultaneous readings and modifications may interfere with each other.A critical section will usually terminate in finite time, and a thread, task, or process will have to wait for a fixed time to enter it (aka bounded waiting). Some synchronization mechanism is required at the entry and exit of the critical section to ensure exclusive use, for example a semaphore.By carefully controlling which variables are modified inside and outside the critical section, concurrent access to that state is prevented. A critical section is typically used when a multithreaded program must update multiple related variables without a separate thread making conflicting changes to that data. In a related situation, a critical section may be used to ensure a shared resource, for example a printer, can only be accessed by one process at a time.How critical sections are implemented varies among operating systems.The simplest method is to prevent any change of processor control inside the critical section. On uni-processor systems, this can be done by disabling interrupts on entry into the critical section, avoiding system calls that can cause a context switch while inside the section, and restoring interrupts to their previous state on exit. Any thread of execution entering any critical section anywhere in the system will, with this implementation, prevent any other thread, including an interrupt, from being granted processing time on the CPU - and therefore from entering any other critical section or, indeed, any code whatsoever - until the original thread leaves its critical section.This brute-force approach can be improved upon by using semaphores. To enter a critical section, a thread must obtain a semaphore, which it releases on leaving the section. Other threads are prevented from entering the critical section at the same time as the original thread, but are free to gain control of the CPU and execute other code, including other critical sections that are protected by different semaphores.".
- Critical_section wikiPageExternalLink ms682530.aspx.
- Critical_section wikiPageExternalLink parallel-programming-understanding-impact-critical-sections.html.
- Critical_section wikiPageID "638312".
- Critical_section wikiPageLength "6498".
- Critical_section wikiPageOutDegree "18".
- Critical_section wikiPageRevisionID "682365622".
- Critical_section wikiPageWikiLink Category:Concurrency_control.
- Critical_section wikiPageWikiLink Category:Programming_constructs.
- Critical_section wikiPageWikiLink Computer_hardware.
- Critical_section wikiPageWikiLink Concurrent_computing.
- Critical_section wikiPageWikiLink Concurrent_programming.
- Critical_section wikiPageWikiLink Context_switch.
- Critical_section wikiPageWikiLink Execution_(computers).
- Critical_section wikiPageWikiLink Execution_(computing).
- Critical_section wikiPageWikiLink Interrupt.
- Critical_section wikiPageWikiLink Lock_(computer_science).
- Critical_section wikiPageWikiLink MSDN_Library.
- Critical_section wikiPageWikiLink Microsoft_Developer_Network.
- Critical_section wikiPageWikiLink Multithreading_(computer_architecture).
- Critical_section wikiPageWikiLink Mutual_exclusion.
- Critical_section wikiPageWikiLink Personal_computer_hardware.
- Critical_section wikiPageWikiLink Preemption_(computing).
- Critical_section wikiPageWikiLink Round-robin_scheduling.
- Critical_section wikiPageWikiLink Scheduling_(computing).
- Critical_section wikiPageWikiLink Semaphore_(programming).
- Critical_section wikiPageWikiLink Software_lockout.
- Critical_section wikiPageWikiLink Synchronization_(computer_science).
- Critical_section wikiPageWikiLink Thread_(computing).
- Critical_section wikiPageWikiLinkText "Critical section".
- Critical_section wikiPageWikiLinkText "Critical_section".
- Critical_section wikiPageWikiLinkText "critical section".
- Critical_section hasPhotoCollection Critical_section.
- Critical_section wikiPageUsesTemplate Template:Morerefs.
- Critical_section wikiPageUsesTemplate Template:R.
- Critical_section wikiPageUsesTemplate Template:Reflist.
- Critical_section wikiPageUsesTemplate Template:Unreferenced_section.
- Critical_section subject Category:Concurrency_control.
- Critical_section subject Category:Programming_constructs.
- Critical_section hypernym Part.
- Critical_section type Article.
- Critical_section type Article.
- Critical_section type Concept.
- Critical_section comment "In concurrent programming, a critical section is a part of a multi-process program that may not be concurrently executed by more than one of the program's processes/threads; in other words, it is a piece of program that requires mutual exclusion of access. Typically, the critical section accesses a shared resource (data structure or device)A critical section may consist of multiple discontiguous parts of the program's code.".
- Critical_section label "Critical section".
- Critical_section sameAs Secció_crítica.
- Critical_section sameAs Kritická_sekce.
- Critical_section sameAs Kritischer_Abschnitt.
- Critical_section sameAs Sección_crítica.
- Critical_section sameAs بخش_بحرانی.
- Critical_section sameAs Kriittinen_alue.
- Critical_section sameAs Section_critique.
- Critical_section sameAs קטע_קריטי.
- Critical_section sameAs Sezione_critica.
- Critical_section sameAs クリティカルセクション.
- Critical_section sameAs 임계_구역.
- Critical_section sameAs Kritieke_sectie.
- Critical_section sameAs Sekcja_krytyczna.
- Critical_section sameAs Região_crítica.
- Critical_section sameAs m.02zf3_.
- Critical_section sameAs Критическая_секция.
- Critical_section sameAs Критична_секція.
- Critical_section sameAs Q1046373.
- Critical_section sameAs Q1046373.
- Critical_section sameAs 臨界區段.
- Critical_section wasDerivedFrom Critical_section?oldid=682365622.
- Critical_section isPrimaryTopicOf Critical_section.