pthread_attr_setschedpolicy(3) [osf1 man page]

pthread_attr_setschedpolicy(3)				     Library Functions Manual				    pthread_attr_setschedpolicy(3)

NAME

       pthread_attr_setschedpolicy - Changes the scheduling policy attribute of the specified thread attributes object.

LIBRARY

       DECthreads POSIX 1003.1c Library (libpthread.so)

SYNOPSIS

       #include <pthread.h>

       int pthread_attr_setschedpolicy(
			 pthread_attr_t  *attr,
			 int		 policy);

STANDARDS

       Interfaces documented on this reference page conform to industry standards as follows:

       IEEE Std 1003.1c-1995, POSIX System Application Program Interface

PARAMETERS

       Thread attributes object to be modified.  New value for the scheduling policy attribute. Valid values are as follows: SCHED_FIFO, SCHED_RR,
       SCHED_FG_NP (also known as SCHED_OTHER), SCHED_BG_NP SCHED_OTHER is the default value.

DESCRIPTION

       This routine sets the scheduling policy of a thread that is created using the attributes object specified by the attr argument. The default
       value of the scheduling attribute is SCHED_OTHER.

       By default, a created thread inherits the priority of the thread calling pthread_create(3).  To specify a policy using this routine, sched-
       uling inheritance must be disabled at the time the thread  is  created.	 Before  calling  pthread_create(3),  call  pthread_attr_setinher-
       itsched(3) and specify the value PTHREAD_EXPLICIT_SCHED for the inherit argument.

       Never attempt to use scheduling as a mechanism for synchronization.

RETURN VALUES

       If  an  error condition occurs, this routine returns an integer value indicating the type of error.  Possible return values are as follows:
       Successful completion.  The value specified by policy is invalid.

ERRORS

       None

RELATED INFORMATION

       Functions:   pthread_attr_init(3),    pthread_attr_getschedpolicy(3),	pthread_attr_setinheritsched(3),    pthread_attr_setschedparam(3),
       pthread_create(3)

       Manuals: Guide to DECthreads and Programmer's Guide

       delim off

														    pthread_attr_setschedpolicy(3)

pthread_attr_init(3)					     Library Functions Manual					      pthread_attr_init(3)

NAME

       pthread_attr_init - Initializes a thread attributes object.

LIBRARY

       DECthreads POSIX 1003.1c Library (libpthread.so)

SYNOPSIS

       #include <pthread.h>

       int pthread_attr_init(
			pthread_attr_t	 *attr,);

STANDARDS

       Interfaces documented on this reference page conform to industry standards as follows:

       IEEE Std 1003.1c-1995, POSIX System Application Program Interface

PARAMETERS

       Address of a thread attributes object to be initialized.

DESCRIPTION

       This  routine  initializes  the	thread	attributes object specified by the attr argument with a set of default attribute values.  A thread
       attributes object is used to specify the attributes of one or more threads when they are created.  The attributes object  created  by  this
       routine is used only in calls to the pthread_create(3) routine.

       The   following	 routines   change   individual  attributes  of  an  initialized  thread  attributes  object:  pthread_attr_setdetachstate
       pthread_attr_setguardsize_np  pthread_attr_setinheritsched  pthread_attr_setschedparam  pthread_attr_setschedpolicy   pthread_attr_setscope
       pthread_attr_setstackaddr pthread_attr_setstacksize

       The  attributes of the thread attributes object are initialized to default values.  The default value of each attribute is discussed in the
       reference description for each routine listed above.

       When a thread attributes object is used to create a thread, the object's attribute values determine the characteristics of the new  thread.
       Thus,  attributes  objects  act as additional arguments to thread creation.  Changing the attributes of a thread attributes object does not
       affect any threads that were previously created using that attributes object.

       You can use the same thread attributes object in successive calls to pthread_create(3), from any thread.  (However, you cannot use the same
       value  of  the stack address attribute to create multiple threads that might run concurrently; threads cannot share a stack.)  If more than
       one thread might change the attributes in a shared attributes object, your program must use  a  mutex  to  protect  the	integrity  of  the
       attributes object's contents.

       When  you  set  the scheduling policy or scheduling parameters, or both, in a thread attributes object, you must disable scheduling inheri-
       tance if you want the scheduling attributes you set to be used at thread creation.  To disable scheduling inheritance, before creating  the
       new thread use the pthread_attr_setinheritsched routine to specify the value PTHREAD_EXPLICIT_SCHED for the inherit argument.

RETURN VALUES

       If an error condition occurs, the thread attributes object cannot be used, and this routine returns an integer value indicating the type of
       error.  Possible return values are as follows: Successful completion.  The value specified by attr is not a valid thread attributes object.
       Insufficient memory exists to initialize the thread attributes object.

ERRORS

       None

RELATED INFORMATION

       Functions:    pthread_attr_destroy(3),	pthread_attr_setdetachstate(3),   pthread_attr_setguardsize(3),   pthread_attr_setinheritsched(3),
       pthread_attr_setschedparam(3), pthread_attr_setschedpolicy(3),  pthread_attr_setscope(3),  pthread_attr_setstackaddr(3),  pthread_attr_set-
       stacksize(3), pthread_create(3)

       Manuals: Guide to DECthreads and Programmer's Guide

       delim off

															      pthread_attr_init(3)