Python threading.settrace() 方法
settrace()是 Python 中线程模块的内置方法。它用于为线程模块创建的所有线程设置跟踪函数。该func
函数传递给sys.settrace()
对于每种方法。
模块:
import threading
用法:
settrace(func)
参数:
func
: 是必填参数,每个线程传递给sys.settrace()。该函数在 run() 方法之前执行。
返回值:
这个方法的返回类型是<class 'NoneType'>
,它不返回任何东西。它为所有线程设置了一个跟踪函数。
例:
# Python program to explain the use of
# settrace() method in Threading Module
import time
import threading
def trace_function():
print("Passing the trace function and current thread is:", str(threading.current_thread().getName()))
def thread_1(i):
time.sleep(5)
threading.settrace(trace_function())
print("Value by Thread-1:",i)
print()
def thread_2(i):
threading.settrace(trace_function())
print("Value by Thread-2:",i)
print()
def thread_3(i):
time.sleep(4)
threading.settrace(trace_function())
print("Value by Thread-3:",i)
print()
def thread_4(i):
time.sleep(1)
threading.settrace(trace_function())
print("Value by Thread-4:",i)
print()
# Creating sample threads
threading.settrace(trace_function())
thread1 = threading.Thread(target=thread_1, args=(1,))
thread2 = threading.Thread(target=thread_2, args=(2,))
thread3 = threading.Thread(target=thread_3, args=(3,))
thread4 = threading.Thread(target=thread_4, args=(4,))
# Starting the threads
thread1.start()
thread2.start()
thread3.start()
thread4.start()
输出
Passing the trace function and current thread is:MainThread Passing the trace function and current thread is:Thread-2 Value by Thread-2:2 Passing the trace function and current thread is:Thread-4 Value by Thread-4:4 Passing the trace function and current thread is:Thread-3 Value by Thread-3:3 Passing the trace function and current thread is:Thread-1 Value by Thread-1:1
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注:本文由纯净天空筛选整理自 Python threading Module | settrace() Method with Example。非经特殊声明,原始代码版权归原作者所有,本译文未经允许或授权,请勿转载或复制。