setpriority for manipulating the priority of a process on osx

#Constants from sys/resources.h
#I/O type
#IOPOL_TYPE_DISK 0

#scope
#IOPOL_SCOPE_PROCESS   0
#IOPOL_SCOPE_THREAD    1

#I/O Priority
#IOPOL_DEFAULT   0
#IOPOL_NORMAL    1
#IOPOL_PASSIVE   2
#IOPOL_THROTTLE  3

#int getiopolicy_np(int iotype, int scope);
#int setiopolicy_np(int iotype, int scope, int policy);

#load libc
from ctypes import cdll
libc=cdll.LoadLibrary('libc.dylib')

print "Get IO Priority Before"
intBefore=libc.getiopolicy_np(0,1)
print intBefore

print "Set IO Priority Result"
boolSetResult=libc.setiopolicy_np(0,1,3)
print boolSetResult

print "Get IO Priority After"
intAfter=libc.getiopolicy_np(0,1)
print intAfter