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When someone writes a new programming language, what do they write it IN?
...programs from disk files or punch cards. You flicked another switch and it started the program running. When I went to university in the 80's I saw computers that had that capacity but never was given the job of loading in a program with the switches.
And even earlier than that computer programs ha...
第一个Hello,OS World操作系统 - 操作系统(内核) - 清泛网 - 专注C/C++及内核技术
...以单独编译这条指令，然后查看二进制，文件0k）
JMP _START ;CPU执行的第一条指令，就是跳转到_START地址处（这里是标签，实际编译后_START是有一个相对地址的）
TIMES 3-($-$$) NOP ;NOP：一个机器周期。$:当前地址，$$:首地址。因...
What is the difference between concurrency and parallelism?
...
Concurrency is when two or more tasks can start, run, and complete in overlapping time periods. It doesn't necessarily mean they'll ever both be running at the same instant. For example, multitasking on a single-core machine.
Parallelism is when tasks literally ru...
What are Java command line options to set to allow JVM to be remotely debugged?
... the agent is selecting a random port number. This might be useful if you start multiple nodes within the same java command line.
– asbachb
Jul 1 at 14:57
...
Runnable with a parameter?
...nal String str) {
Thread t = new Thread(() -> someFunc(str));
t.start();
}
As before, details like handling that thread in a meaningful way is left as an exercise to the reader. But to put it bluntly, if you're afraid of using lambdas, you should be even more afraid of multi-threaded sy...
Are lists thread-safe?
...
t1 = threading.Thread(target=add)
t2 = threading.Thread(target=remove)
t1.start()
t2.start()
t1.join()
t2.join()
print(l)
Output when ERROR
Exception in thread Thread-63:
Traceback (most recent call last):
File "/Users/zup/.pyenv/versions/3.6.8/lib/python3.6/threading.py", line 916, in _boots...
What is the difference between the kernel space and the user space?
...perating systems transition between rings?
when the CPU is turned on, it starts running the initial program in ring 0 (well kind of, but it is a good approximation). You can think this initial program as being the kernel (but it is normally a bootloader that then calls the kernel still in ring 0)....
What exactly is Python multiprocessing Module's .join() Method Doing?
...e this behavior by setting the daemon flag on the Process to True prior to starting the process:
p = Process(target=say_hello)
p.daemon = True
p.start()
# Both parent and child will exit here, since the main process has completed.
If you do that, the child process will be terminated as soon as th...
How to remove the left part of a string?
...
Starting in Python 3.9, you can use removeprefix:
'Path=helloworld'.removeprefix('Path=')
# 'helloworld'
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How can I match multiple occurrences with a regex in JavaScript similar to PHP's preg_match_all()?
...
@fdrv You have to reset the lastIndex to zero before starting the loop: this.lastIndex = 0;
– C-F
Jun 15 '17 at 4:13
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