However, if the mutex is locked this call won't block.
然而，如果互斥对象已锁定，这个调用也不会阻塞。
Catch block, and that you call the close method on your connection inside a finally block.
catch块中，而且在finally块中在连接上调用close方法。
No matching function for call to... but only inside a block?
没有匹配的函数调用…但只在一块？
You can't just have the PROCESS block call a function within the END block.
您不能只需调用END块内的某个函数的过程块。
You can't just have the PROCESS block call a function within the END block.
您不能只需调用END块内的某个函数的过程块。
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