line synchronization

基本解释

And we've extended support for drag-and-drop and off-line scheduled synchronization to Mozilla browser users.
我们已经扩展了对拖放功能和 Mozilla 浏览器用户的脱机计划同步的支持。
The multi-thread programming series, uses the signal quantity to carry on line regulation synchronization. A very good example code.
多线程编程系列，使用信号量进行线程同步。一个很好的实例代码。
Subsequent invocations do not require synchronization because the first invocation is the only invocation that executes the code at //2, which is the only line that requires synchronization.
由于只有第一次调用执行了 //2 处的代码，而只有此行代码需要同步，因此就无需对后续调用使用同步。