74 lines
2.0 KiB
Python
74 lines
2.0 KiB
Python
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import threading
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import logging
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logger = logging.getLogger(__name__)
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class CpuUsageThread(threading.Thread):
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sharedInstance = None
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@staticmethod
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def getSharedInstance():
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if CpuUsageThread.sharedInstance is None:
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CpuUsageThread.sharedInstance = CpuUsageThread()
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return CpuUsageThread.sharedInstance
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def __init__(self):
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self.clients = []
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self.doRun = True
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self.last_worktime = 0
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self.last_idletime = 0
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self.endEvent = threading.Event()
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super().__init__()
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def run(self):
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while self.doRun:
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try:
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cpu_usage = self.get_cpu_usage()
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except:
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cpu_usage = 0
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for c in self.clients:
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c.write_cpu_usage(cpu_usage)
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self.endEvent.wait(timeout=3)
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logger.debug("cpu usage thread shut down")
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def get_cpu_usage(self):
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try:
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f = open("/proc/stat", "r")
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except:
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return 0 # Workaround, possibly we're on a Mac
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line = ""
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while not "cpu " in line:
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line = f.readline()
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f.close()
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spl = line.split(" ")
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worktime = int(spl[2]) + int(spl[3]) + int(spl[4])
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idletime = int(spl[5])
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dworktime = worktime - self.last_worktime
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didletime = idletime - self.last_idletime
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rate = float(dworktime) / (didletime + dworktime)
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self.last_worktime = worktime
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self.last_idletime = idletime
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if self.last_worktime == 0:
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return 0
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return rate
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def add_client(self, c):
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self.clients.append(c)
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if not self.is_alive():
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self.start()
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def remove_client(self, c):
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try:
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self.clients.remove(c)
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except ValueError:
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pass
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if not self.clients:
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self.shutdown()
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def shutdown(self):
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CpuUsageThread.sharedInstance = None
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self.doRun = False
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self.endEvent.set()
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