--- /dev/null
+++ Libc/Libc-583/pthreads/pthread_attr_set_getschedparam.3
@@ -0,0 +1,81 @@
+.\" 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