在Groovy中使用同步的println和println對於線程化腳本有什麼區別？

Question

在Groovy中爲線程腳本使用synchronized println和println有什麼區別？

synchronized out(message) { 
println(message) 
} 

def thread1 = Thread.start { 
out "TEST" 
} 
def thread2 = Thread.start { 
out "TEST" 
} 
def thread3 = Thread.start { 
out "TEST" 
} 

Answer 1

沒有區別，直到您調用single println命令。一個println在內部同步。但是，如果你出包含多個打印報表，可能有這樣的情況，下面illistrated

out(int threadId){ 
    println("line 1 T$threadId") 
    println("line 2 T$threadId") 
} 

Execution may flow like 
//output by 2 threads 
line 1 T1 // thread 1 entered out 
// thread 1 was interrupted 
// thread 2 entered out 
line 1 T2 
line 2 T2 //end of thread 2 out 
// Thread 1 resumed 
line 2 T1 

正如我們看到的，輸出一團糟。同步修復該問題

參見SO回答有關的println內同步 https://stackoverflow.com/a/9459886/1601606