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PHP flock（）非阻塞仍然阻塞为什么？(PHP flock() non-blocking still block why?)

 我使用flock（）函数通过获取临时文件上的锁来检查脚本的另一个实例是否已在运行，因此下一个实例应该检查文件是否未锁定，否则它会停止  
<?php    
$fp = fopen("/var/tmp/your.lock", "w");
if (!flock($fp, LOCK_EX|LOCK_NB)) { // try to get exclusive lock, non-blocking
    die("Another instance is running");
} 

//my script 
sleep(10);
echo 'completed successfully';
 
 当从同一浏览器同时打开两个实例时，该脚本在不同浏览器同时调用两次文件时工作正常，即第一次调用获取锁定，第二次调用等待锁定而不关闭  
 我知道可能有其他方法来检查一个实例文件是否已经正常工作，但其中大多数会做一件事情然后撤消它，在我的用例中，脚本可能随时结束，因为它可能需要很长时间或超过内存限制或无论如何  
 任何帮助？ 

I'm using flock() function to check if another instance of the script is already running by obtaining the lock on a temporary file so next instance should check if the file is not locked otherwise it stops  
<?php    
$fp = fopen("/var/tmp/your.lock", "w");
if (!flock($fp, LOCK_EX|LOCK_NB)) { // try to get exclusive lock, non-blocking
    die("Another instance is running");
} 

//my script 
sleep(10);
echo 'completed successfully';
 
the script works without problem when calling the file twice at the same time from different browsers while it waits if I opened two instances at the same time from the same browser i.e the first call get the lock and the second wait for the lock and not closing  
I know there may be other ways to check if a file an instance is already working but most of them will do a thing then undo it and in my use case the script may end any time as it may take long time or exceed memory limit or by any reason  
any help ?

原文：https://stackoverflow.com/questions/13331809

更新时间：2023-06-28 10:06

最满意答案

 你可以使用以下（progromatically）  
ed.setInputType(InputType.TYPE_NUMBER_FLAG_DECIMAL);
ed.setKeyListener(DigitsKeyListener.getInstance("0123456789.$"));
 
 您可以在DigitsKeyListener.getInstance定义所需的任何字符  
 或者如果不希望用户输入$符号并且您希望在用户完成编辑后手动输入...  
@Override
protected OnFocusChangeListener getOnFocusChangeListener() {
return new OnFocusChangeListener() {
    @Override
    public void onFocusChange(View v, boolean hasFocus) {
        if (hasFocus) {
            //Member variable in the class which contains an EditText
            CurrencyTextbox.this.hadFocus = true;
        } else {
            // Thes EditText has lost focus
            Log.v(TAG, "Lost focus.");
            if (CurrencyTextbox.this.hadFocus) {
                // We previously had focus, now we lost it, format the user input!
                // Get current value of the Textbox
                String value = CurrencyTextbox.this.textbox.getText().toString();
                // Formatting the user input
                value = String.format(//Doing some formatting);
                // Reset the had focus
                CurrencyTextbox.this.hadFocus = false;
            }
        }
    }
};

you can use the following (progromatically) 
ed.setInputType(InputType.TYPE_NUMBER_FLAG_DECIMAL);
ed.setKeyListener(DigitsKeyListener.getInstance("0123456789.$"));
 
you can define whatever characters you want within the DigitsKeyListener.getInstance 
or if dont want the user to enter the $ sign and you want to be entered manually after the user finishes editting... 
@Override
protected OnFocusChangeListener getOnFocusChangeListener() {
return new OnFocusChangeListener() {
    @Override
    public void onFocusChange(View v, boolean hasFocus) {
        if (hasFocus) {
            //Member variable in the class which contains an EditText
            CurrencyTextbox.this.hadFocus = true;
        } else {
            // Thes EditText has lost focus
            Log.v(TAG, "Lost focus.");
            if (CurrencyTextbox.this.hadFocus) {
                // We previously had focus, now we lost it, format the user input!
                // Get current value of the Textbox
                String value = CurrencyTextbox.this.textbox.getText().toString();
                // Formatting the user input
                value = String.format(//Doing some formatting);
                // Reset the had focus
                CurrencyTextbox.this.hadFocus = false;
            }
        }
    }
};

PHP flock（）非阻塞仍然阻塞为什么？(PHP flock() non-blocking still block why?)

最满意答案

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