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pthread_attr_getinheritsched (3)
  • pthread_attr_getinheritsched (3) ( Solaris man: Библиотечные вызовы )
  • pthread_attr_getinheritsched (3) ( FreeBSD man: Библиотечные вызовы )
  • >> pthread_attr_getinheritsched (3) ( Linux man: Библиотечные вызовы )
  • pthread_attr_getinheritsched (3) ( POSIX man: Библиотечные вызовы )
  •  

    NAME

    pthread_attr_setinheritsched, pthread_attr_getinheritsched - set/get
    inherit scheduler attribute in thread attributes object
     
    

    SYNOPSIS

    #include <pthread.h>
    
    int pthread_attr_setinheritsched(pthread_attr_t *attr,
                                     int inheritsched);
    int pthread_attr_getinheritsched(pthread_attr_t *attr,
                                     int *inheritsched);
    
    Compile and link with -pthread.
    
     

    DESCRIPTION

    The pthread_attr_setinheritsched() function sets the inherit scheduler attribute of the thread attributes object referred to by attr to the value specified in inheritsched. The inherit scheduler attribute determines whether a thread created using the thread attributes object attr will inherit its scheduling attributes from the calling thread or whether it will take them from attr.

    The following values may be specified in inheritsched:

    PTHREAD_INHERIT_SCHED
    Threads that are created using attr inherit scheduling attributes from the creating thread; the scheduling attributes in attr are ignored.
    PTHREAD_EXPLICIT_SCHED
    Threads that are created using attr take their scheduling attributes from the values specified by the attributes object.

    The default setting of the inherit scheduler attribute in a newly initialized thread attributes object is PTHREAD_INHERIT_SCHED.

    The pthread_attr_getinheritsched() returns the inherit scheduler attribute of the thread attributes object attr in the buffer pointed to by inheritsched.  

    RETURN VALUE

    On success, these functions return 0; on error, they return a non-zero error number.  

    ERRORS

    pthread_attr_setinheritsched() can fail with the following error:
    EINVAL
    Invalid value in inheritsched.

    POSIX.1-2001 also documents an optional ENOTSUP error ("attempt was made to set the attribute to an unsupported value") for pthread_attr_setinheritsched().  

    CONFORMING TO

    POSIX.1-2001.  

    EXAMPLE

    See pthread_setschedparam(3).  

    BUGS

    As at glibc 2.8, if a thread attributes object is initialized using pthread_attr_init(3), then the scheduling policy of the attributes object is set to SCHED_OTHER and the scheduling priority is set to 0. However, if the inherit scheduler attribute is then set to PTHREAD_EXPLICIT_SCHED, then a thread created using the attribute object wrongly inherits its scheduling attributes from the creating thread. This bug does not occur if either the scheduling policy or scheduling priority attribute is explicitly set in the thread attributes object before calling pthread_create(3).  

    SEE ALSO

    sched_setscheduler(2), pthread_attr_init(3), pthread_attr_setschedparam(3), pthread_attr_setschedpolicy(3), pthread_create(3), pthread_setschedparam(3), pthread_setschedprio(3), pthreads(7)  

    COLOPHON

    This page is part of release 3.14 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.


     

    Index

    NAME
    SYNOPSIS
    DESCRIPTION
    RETURN VALUE
    ERRORS
    CONFORMING TO
    EXAMPLE
    BUGS
    SEE ALSO
    COLOPHON


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