Libc-997.1.1.tar.gz

[apple/libc.git] / pthreads / pthread_attr_set_getschedparam.3

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-.\" Copyright (c) 2004-2007 Apple Inc. All rights reserved.
-.Dd December 31, 2007
-.Dt PTHREAD_ATTR 3
-.Os
-.Sh NAME
-.Nm pthread_attr_getschedparam ,
-.Nm pthread_attr_setschedparam
-.Nd thread attribute operations
-.Sh SYNOPSIS
-.Fd #include <pthread.h>
-.Ft int
-.Fo pthread_attr_getschedparam
-.Fa "const pthread_attr_t *restrict attr"
-.Fa "struct sched_param *restrict param"
-.Fc
-.Ft int
-.Fo pthread_attr_setschedparam
-.Fa "pthread_attr_t *restrict attr"
-.Fa "const struct sched_param *restrict param"
-.Fc
-.Sh DESCRIPTION
-Thread attributes are used to specify parameters to
-.Fn pthread_create .
-One attribute object can be used in multiple calls to
-.Fn pthread_create ,
-with or without modifications between calls.
-.Pp
-.Fn pthread_attr_getschedparam
-and
-.Fn pthread_attr_setschedparam
-get and set the scheduling parameters within the 
-.Fa attr
-argument. See
-.Fd /usr/include/sched.h
-for the definition of 
-.Fa struct sched_param . 
-The 
-.Fa sched_priority
-field of
-.Fa struct sched_param
-can be set to SCHED_OTHER, SCHED_FIFO and SCHED_RR.
-.Sh RETURN VALUES
-If successful, these functions return 0.
-Otherwise, an error number is returned to indicate the error.
-.Fn pthread_attr_getschedparam ,
-on success, will copy the value of the thread's scheduling parameter attribute
-to the location pointed to by the second function parameter.
-.Sh ERRORS
-.Pp
-.Fn pthread_attr_getschedparam
-will fail if:
-.Bl -tag -width Er
-.\" ========
-.It Bq Er EINVAL
-Invalid value for
-.Fa attr .
-.\" ========
-.El
-.Pp
-.Fn pthread_attr_setschedparam
-will fail if:
-.Bl -tag -width Er
-.\" ========
-.It Bq Er EINVAL
-Invalid value for
-.Fa attr .
-.\" ========
-.It Bq Er ENOTSUP
-Invalid value for
-.Fa param .
-.El
-.Sh SEE ALSO
-.Xr pthread_create 3 ,
-.Xr pthread_attr_init 3 ,
-.Xr pthread_attr_setinheritsched 3 
-.Sh STANDARDS
-.Pp
-.Fn pthread_attr_setschedparam ,
-.Fn pthread_attr_getschedparam 
-conform to
-.St -susv2