确保我的程序没有执行并发文件写入

从为并发检查描述的解决方案的启发中，我想到了以下代码片段。如果人们能够适当地预测所讨论文件的写入频率，它就可以工作。解决方案是通过使用文件修改时间。

import osimport time'''Find if a file was modified in the last x seconds given by writeFrequency.'''def isFileBeingWrittenInto(filename,  writeFrequency = 180, overheadTimePercentage = 20):    overhead = 1+float(overheadTimePercentage)/100 # Add some buffer time    maxWriteFrequency = writeFrequency * overhead    modifiedTimeStart = os.stat(filename).st_mtime # Time file last modified    time.sleep(writeFrequency)          # wait writeFrequency # of secs    modifiedTimeEnd = os.stat(filename).st_mtime   # File modification time again    if 0 < (modifiedTimeEnd - modifiedTimeStart) <= maxWriteFrequency:        return True    else:        return Falseif not isFileBeingWrittenInto('fileForSafeWrites.txt'):    handle = open('fileForSafeWrites.txt', 'a')    handle.write("Text written safely when no one else is writing to the file")    handle.close()

这并不能进行真正的并发检查，但是可以结合多种其他方法用于实际目的，以安全地写入文件而不必担心文本乱码。希望它可以帮助下一个寻找方法的人。

编辑更新 ：

经过进一步测试，我遇到了高频写入过程，该过程要求修改条件逻辑。

if 0 < (modifiedTimeEnd - modifiedTimeStart) < maxWriteFrequency

至

if 0 < (modifiedTimeEnd - modifiedTimeStart) <= maxWriteFrequency

从理论上和实践上，这都是一个更好的答案。