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pthread_setconcurrency (3)
  • >> pthread_setconcurrency (3) ( FreeBSD man: Библиотечные вызовы )
  • pthread_setconcurrency (3) ( POSIX man: Библиотечные вызовы )

  • BSD mandoc
     

    NAME

    
    
    pthread_getconcurrency
    
     
    pthread_setconcurrency
    
     - get or set level of concurrency
    
     
    

    LIBRARY

    Lb libpthread
    
     
    

    SYNOPSIS

       #include <pthread.h>
    int pthread_getconcurrency (void);
    int pthread_setconcurrency (int new_level);
     

    DESCRIPTION

    The pthread_getconcurrency ();
    function allows an application to inform the threads implementation of its desired concurrency level, Fa new_level . The actual level of concurrency provided by the implementation as a result of this function call is unspecified. If Fa new_level is zero, it causes the implementation to maintain the concurrency level at its discretion as if pthread_setconcurrency ();
    was never called. The pthread_getconcurrency ();
    function returns the value set by a previous call to the pthread_setconcurrency ();
    function. If the pthread_setconcurrency ();
    function was not previously called, this function returns zero to indicate that the implementation is maintaining the concurrency level. When an application calls pthread_setconcurrency (,);
    it is informing the implementation of its desired concurrency level. The implementation uses this as a hint, not a requirement.  

    RETURN VALUES

    If successful, the pthread_setconcurrency ();
    function returns zero. Otherwise, an error number is returned to indicate the error. The pthread_getconcurrency ();
    function always returns the concurrency level set by a previous call to pthread_setconcurrency (.);
    If the pthread_setconcurrency ();
    function has never been called, pthread_getconcurrency ();
    returns zero.  

    ERRORS

    The pthread_setconcurrency ();
    function will fail if:

    Bq Er EINVAL
    The value specified by Fa new_level is negative.
    Bq Er EAGAIN
    The value specified by Fa new_level would cause a system resource to be exceeded.

     

    APPLICATION USAGE

    Use of these functions changes the state of the underlying concurrency upon which the application depends. Library developers are advised to not use the pthread_getconcurrency ();
    and pthread_setconcurrency ();
    functions since their use may conflict with an application's use of these functions.  

    STANDARDS

    The pthread_getconcurrency ();
    and pthread_setconcurrency ();
    functions conform to St -susv2 .


     

    Index

    NAME
    LIBRARY
    SYNOPSIS
    DESCRIPTION
    RETURN VALUES
    ERRORS
    APPLICATION USAGE
    STANDARDS


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