openCom-Companion/sbapp/plyer/platforms/win/cpu.py

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2022-09-16 18:07:57 +02:00
'''
Module of Windows API for plyer.cpu.
'''
from ctypes import (
c_ulonglong, c_ulong, byref,
Structure, POINTER, Union, windll, create_string_buffer,
sizeof, cast, c_void_p, c_uint32
)
from ctypes.wintypes import (
BYTE, DWORD, WORD
)
from plyer.facades import CPU
KERNEL = windll.kernel32
ERROR_INSUFFICIENT_BUFFER = 0x0000007A
class CacheType:
'''
Win API PROCESSOR_CACHE_TYPE enum.
'''
unified = 0
instruction = 1
data = 2
trace = 3
class RelationshipType:
'''
Win API LOGICAL_PROCESSOR_RELATIONSHIP enum.
'''
processor_core = 0 # logical proc sharing single core
numa_node = 1 # logical proc sharing single NUMA node
cache = 2 # logical proc sharing cache
processor_package = 3 # logical proc sharing physical package
group = 4 # logical proc sharing processor group
all = 0xffff # logical proc info for all groups
class CacheDescriptor(Structure):
'''
Win API CACHE_DESCRIPTOR struct.
'''
_fields_ = [
('Level', BYTE),
('Associativity', BYTE),
('LineSize', WORD),
('Size', DWORD),
('Type', DWORD)
]
class ProcessorCore(Structure):
'''
Win API ProcessorCore struct.
'''
_fields_ = [('Flags', BYTE)]
class NumaNode(Structure):
'''
Win API NumaNode struct.
'''
_fields_ = [('NodeNumber', DWORD)]
class SystemLPIUnion(Union):
'''
Win API SYSTEM_LOGICAL_PROCESSOR_INFORMATION union without name.
'''
_fields_ = [
('ProcessorCore', ProcessorCore),
('NumaNode', NumaNode),
('Cache', CacheDescriptor),
('Reserved', c_ulonglong)
]
class SystemLPI(Structure):
'''
Win API SYSTEM_LOGICAL_PROCESSOR_INFORMATION struct.
'''
_fields_ = [
('ProcessorMask', c_ulong),
('Relationship', c_ulong),
('LPI', SystemLPIUnion)
]
class WinCPU(CPU):
'''
Implementation of Windows CPU API.
'''
@staticmethod
def _countbits(mask):
# make sure the correct ULONG_PTR size is used on 64bit
# https://docs.microsoft.com/en-us/windows/
# desktop/WinProg/windows-data-types
# note: not a pointer per-se, != PULONG_PTR
ulong_ptr = c_ulonglong if sizeof(c_void_p) == 8 else c_ulong
# note: c_ulonglong only on 64bit, otherwise c_ulong
# DWORD == c_uint32
# https://docs.microsoft.com/en-us/windows/
# desktop/WinProg/windows-data-types
lshift = c_uint32(sizeof(ulong_ptr) * 8 - 1)
assert lshift.value in (31, 63), lshift # 32 or 64 bits - 1
lshift = lshift.value
test = 1 << lshift
assert test % 2 == 0, test
count = 0
i = 0
while i <= lshift:
i += 1
# do NOT remove!!!
# test value has to be %2 == 0,
# except the last case where the value is 1,
# so that int(test) == int(float(test))
# and the mask bit is counted correctly
assert test % 2 == 0 or float(test) == 1.0, test
# https://stackoverflow.com/a/1746642/5994041
# note: useful to print(str(bin(int(...)))[2:])
count += 1 if (mask & int(test)) else 0
test /= 2
return count
def _logprocinfo(self, relationship):
get_logical_process_info = KERNEL.GetLogicalProcessorInformation
# first call with no structure to get the real size of the required
buff_length = c_ulong(0)
result = get_logical_process_info(None, byref(buff_length))
assert not result, result
error = KERNEL.GetLastError()
assert error == ERROR_INSUFFICIENT_BUFFER, error
assert buff_length, buff_length
# create buffer from the real winapi buffer length
buff = create_string_buffer(buff_length.value)
# call again with buffer pointer + the same length as arguments
result = get_logical_process_info(buff, byref(buff_length))
assert result, (result, KERNEL.GetLastError())
# memory size of one LPI struct in the array of LPI structs
offset = sizeof(SystemLPI) # ok
values = {
key: 0 for key in (
'relationship', 'mask',
'L1', 'L2', 'L3'
)
}
for i in range(0, buff_length.value, offset):
slpi = cast(
buff[i: i + offset],
POINTER(SystemLPI)
).contents
if slpi.Relationship != relationship:
continue
values['relationship'] += 1
values['mask'] += self._countbits(slpi.ProcessorMask)
if slpi.LPI.Cache.Level == 1:
values['L1'] += 1
elif slpi.LPI.Cache.Level == 2:
values['L2'] += 1
elif slpi.LPI.Cache.Level == 3:
values['L3'] += 1
return values
def _sockets(self):
# physical CPU sockets (or slots) on motherboard
return self._logprocinfo(
RelationshipType.processor_package
)['relationship']
def _physical(self):
# cores
return self._logprocinfo(
RelationshipType.processor_core
)['relationship']
def _logical(self):
# cores * threads
# if hyperthreaded core -> more than one logical processor
return self._logprocinfo(
RelationshipType.processor_core
)['mask']
def _cache(self):
# L1, L2, L3 cache count
result = self._logprocinfo(
RelationshipType.cache
)
return {
key: result[key]
for key in result
if key in ('L1', 'L2', 'L3')
}
def _numa(self):
# numa nodes
return self._logprocinfo(
RelationshipType.numa_node
)['relationship']
def instance():
'''
Instance for facade proxy.
'''
return WinCPU()
# Resources:
# GetLogicalProcessInformation
# https://msdn.microsoft.com/en-us/library/ms683194(v=vs.85).aspx
# SYSTEM_LOGICAL_PROCESSOR_INFORMATION
# https://msdn.microsoft.com/en-us/library/ms686694(v=vs.85).aspx
# LOGICAL_PROCESSOR_RELATIONSHIP enum (0 - 4, 0xffff)
# https://msdn.microsoft.com/2ada52f0-70ec-4146-9ef7-9af3b08996f9
# CACHE_DESCRIPTOR struct
# https://msdn.microsoft.com/38cfa605-831c-45ef-a99f-55f42b2b56e9
# PROCESSOR_CACHE_TYPE
# https://msdn.microsoft.com/23044f67-e944-43c2-8c75-3d2fba87cb3c
# C example
# https://msdn.microsoft.com/en-us/904d2d35-f419-4e8f-a689-f39ed926644c