The OpenNET Project / Index page

[ новости /+++ | форум | wiki | теги | ]

Интерактивная система просмотра системных руководств (man-ов)

 ТемаНаборКатегория 
 
 [Cписок руководств | Печать]

atomic_inc (9)
  • atomic_inc (3) ( Solaris man: Библиотечные вызовы )
  • atomic_inc (9) ( Solaris man: Ядро )
  • >> atomic_inc (9) ( Linux man: Ядро )
  •  

    NAME

    atomic_add, atomic_sub, atomic_inc, atomic_dec - thread/SMP safe arithmetic on atomic data
    
    
     
    

    SYNOPSIS

    #include <asm/atomic.h>

    void atomic_add(int i, volatile atomic_t*v)
    void atomic_sub(int i, volatile atomic_t*v)
    void atomic_inc(volatile atomic_t*v)
    void atomic_dec(volatile atomic_t*v)
    int atomic_read(volatile atomic_t*v)
    void atomic_set(volatile atomic_t*v, int i)
    int atomic_dec_and_test(volatile atomic_t*v)

     

    DESCRIPTION

    These functions manipulate variables of type atomic_t is SMP and interrupt safe ways. These variables can be used to hold spin locks or SMP-safe reference counters. These functions guarantee that the operation that they represent is performed correctly. If necessary, hardware bus locking is performed to protect the operation. Usually, the CPU has some sort of atomic instructions that allow these operations to be performed quickly and safely.

    The atomic_dec_and_test decrements the atomic variable, and returns true if the result is zero. This function is particularly useful in implementing spin locks on SMP systems.  

    RETURN VALUE

    The atomic_read function returns the integer value of the atomic variable.

    The atomic_dec_and_test returns TRUE if the value becomes zero after the decrement.  

    AVAILABILITY

    Linux 2.0+  

    SEE ALSO

    intro(9)  

    AUTHOR

    Stephen Williams <steve@icarus.com>  

    BUGS

    The read and set operations generally have no special protections.


     

    Index

    NAME
    SYNOPSIS
    DESCRIPTION
    RETURN VALUE
    AVAILABILITY
    SEE ALSO
    AUTHOR
    BUGS


    Поиск по тексту MAN-ов: 




    Спонсоры:
    Inferno Solutions
    Ideco
    A-Real
    Hosting by Hoster.ru
    Хостинг:

    Закладки на сайте
    Проследить за страницей
    Created 1996-2021 by Maxim Chirkov
    Добавить, Поддержать, Вебмастеру