multithreading

问题 I want to understand the ordering constraints between nested streams in Java. Example 1: public static void main(String[] args) { IntStream.range(0, 10).forEach(i -> { System.out.println(i); IntStream.range(0, 10).forEach(j -> { System.out.println(" " + i + " " + j); }); }); } This code executes deterministically, so the inner loop runs forEach on each j before the outer loop runs its own forEach on the next i : 0 0 0 0 1 0 2 0 3 0 4 0 5 0 6 0 7 0 8 0 9 1 1 0 1 1 1 2 1 3 1 4 1 5 1 6 1 7 1 8 1

问题 I want to understand the ordering constraints between nested streams in Java. Example 1: public static void main(String[] args) { IntStream.range(0, 10).forEach(i -> { System.out.println(i); IntStream.range(0, 10).forEach(j -> { System.out.println(" " + i + " " + j); }); }); } This code executes deterministically, so the inner loop runs forEach on each j before the outer loop runs its own forEach on the next i : 0 0 0 0 1 0 2 0 3 0 4 0 5 0 6 0 7 0 8 0 9 1 1 0 1 1 1 2 1 3 1 4 1 5 1 6 1 7 1 8 1

问题 i'm currently upgrading some existing code for use by windows universal and am struggling to convert a command pattern to work with the new async/await functionality. I have a command scheduler class that runs within its own thread and processes commands that have been added to its queue. The method in question looks like this: private List<ICommandItem> _items; private void ProcessCommands() { while(_items.count > 0) { _items[0].Execute(); _items.RemoveAt(0); } } My problem is that some of

问题 i'm currently upgrading some existing code for use by windows universal and am struggling to convert a command pattern to work with the new async/await functionality. I have a command scheduler class that runs within its own thread and processes commands that have been added to its queue. The method in question looks like this: private List<ICommandItem> _items; private void ProcessCommands() { while(_items.count > 0) { _items[0].Execute(); _items.RemoveAt(0); } } My problem is that some of

问题 i'm currently upgrading some existing code for use by windows universal and am struggling to convert a command pattern to work with the new async/await functionality. I have a command scheduler class that runs within its own thread and processes commands that have been added to its queue. The method in question looks like this: private List<ICommandItem> _items; private void ProcessCommands() { while(_items.count > 0) { _items[0].Execute(); _items.RemoveAt(0); } } My problem is that some of

问题 i'm currently upgrading some existing code for use by windows universal and am struggling to convert a command pattern to work with the new async/await functionality. I have a command scheduler class that runs within its own thread and processes commands that have been added to its queue. The method in question looks like this: private List<ICommandItem> _items; private void ProcessCommands() { while(_items.count > 0) { _items[0].Execute(); _items.RemoveAt(0); } } My problem is that some of

问题 I need to catch the returned value of a child process.. The problem is: with using the waitpid() function I can catch only 8 bits of the returned value WEXITSTATUS(wstatus) returns the exit status of the child. This consists of the least significant 8 bits of the status argument that the child specified in a call to exit(3) or _exit(2) or as the argument for a return statement in main(). This macro should be employed only if WIFEXITED returned true. How can I catch the full int value that is

问题 I need to catch the returned value of a child process.. The problem is: with using the waitpid() function I can catch only 8 bits of the returned value WEXITSTATUS(wstatus) returns the exit status of the child. This consists of the least significant 8 bits of the status argument that the child specified in a call to exit(3) or _exit(2) or as the argument for a return statement in main(). This macro should be employed only if WIFEXITED returned true. How can I catch the full int value that is

问题 I need to catch the returned value of a child process.. The problem is: with using the waitpid() function I can catch only 8 bits of the returned value WEXITSTATUS(wstatus) returns the exit status of the child. This consists of the least significant 8 bits of the status argument that the child specified in a call to exit(3) or _exit(2) or as the argument for a return statement in main(). This macro should be employed only if WIFEXITED returned true. How can I catch the full int value that is

问题 I'm totally fresh about threading and GUIs, therefore I couldn't figure out exactly where to call this EventQueue.invokeLater() method. Am I supposed to call it in every event listeners and something else? What are those "things" to call this method? If so, is there any alternative way to call-once-apply-everywhere method so that It won't take bunch of lines to tuck them to the Event dispatch thread? Thank you. 回答1: therefore I couldn't figure out exactly where to call this EventQueue