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nice (3)
  • nice (1) ( Solaris man: Команды и прикладные программы пользовательского уровня )
  • nice (1) ( FreeBSD man: Команды и прикладные программы пользовательского уровня )
  • nice (1) ( Русские man: Команды и прикладные программы пользовательского уровня )
  • nice (1) ( Linux man: Команды и прикладные программы пользовательского уровня )
  • nice (1) ( POSIX man: Команды и прикладные программы пользовательского уровня )
  • nice (2) ( Solaris man: Системные вызовы )
  • nice (2) ( Русские man: Системные вызовы )
  • nice (2) ( Linux man: Системные вызовы )
  • nice (3) ( Solaris man: Библиотечные вызовы )
  • nice (3) ( FreeBSD man: Библиотечные вызовы )
  • >> nice (3) ( POSIX man: Библиотечные вызовы )
  • Ключ nice обнаружен в базе ключевых слов.
  •  

    NAME

    nice - change the nice value of a process
     
    

    SYNOPSIS

    #include <unistd.h>

    int nice(int incr);
     

    DESCRIPTION

    The nice() function shall add the value of incr to the nice value of the calling process. A process' nice value is a non-negative number for which a more positive value shall result in less favorable scheduling.

    A maximum nice value of 2*{NZERO}-1 and a minimum nice value of 0 shall be imposed by the system. Requests for values above or below these limits shall result in the nice value being set to the corresponding limit. Only a process with appropriate privileges can lower the nice value.

    Calling the nice() function has no effect on the priority of processes or threads with policy SCHED_FIFO or SCHED_RR. The effect on processes or threads with other scheduling policies is implementation-defined.

    The nice value set with nice() shall be applied to the process. If the process is multi-threaded, the nice value shall affect all system scope threads in the process.

    As -1 is a permissible return value in a successful situation, an application wishing to check for error situations should set errno to 0, then call nice(), and if it returns -1, check to see whether errno is non-zero.  

    RETURN VALUE

    Upon successful completion, nice() shall return the new nice value -{NZERO}. Otherwise, -1 shall be returned, the process' nice value shall not be changed, and errno shall be set to indicate the error.  

    ERRORS

    The nice() function shall fail if:

    EPERM
    The incr argument is negative and the calling process does not have appropriate privileges.

    The following sections are informative.  

    EXAMPLES

     

    Changing the Nice Value

    The following example adds the value of the incr argument, -20, to the nice value of the calling process.

    
    #include <unistd.h>
    ...
    int incr = -20;
    int ret;
    
    
    ret = nice(incr);
    
    
     

    APPLICATION USAGE

    None.  

    RATIONALE

    None.  

    FUTURE DIRECTIONS

    None.  

    SEE ALSO

    getpriority() , setpriority() , the Base Definitions volume of IEEE Std 1003.1-2001, <limits.h>, <unistd.h>  

    COPYRIGHT

    Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of Electrical and Electronics Engineers, Inc and The Open Group. In the event of any discrepancy between this version and the original IEEE and The Open Group Standard, the original IEEE and The Open Group Standard is the referee document. The original Standard can be obtained online at http://www.opengroup.org/unix/online.html .


     

    Index

    NAME
    SYNOPSIS
    DESCRIPTION
    RETURN VALUE
    ERRORS
    EXAMPLES
    Changing the Nice Value
    APPLICATION USAGE
    RATIONALE
    FUTURE DIRECTIONS
    SEE ALSO
    COPYRIGHT


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