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当全球变量得到更新时,发出信号
原标题:Masking signal when global variables are being updated

我知道,我可以掩盖在手递执行时发出的信号(使用 s子)。 然而,我想知道,在我更新一些全球变量时,如何掩盖一个信号。

此外,我想知道,在某个用户确定的职能执行时如何掩盖一个信号。

这2件事情是可能的吗?

任何帮助都将受到赞赏。

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问题回答

你可以称之为“签字”你想要的任何时候;或者说是为了(a)把信号手写给某些习俗法典,或者(b)通过向全国人民力量联盟提出手脚论点来澄清。

sigaction()当然会给你更细致的控制。 如果你愿意,你也可以说谎(例如,在更新你的全球变量之前)。

这一联系可能有助于:

http://www.linuxjournal.com/article/6483

有可能用<代码>sigblock(>阻断信号。 当信号被锁定时,将发出信号。

HOWEVER——这是昂贵的。 你们必须进行劝说,阻止和劝说打破僵局。 如果你经常这样做,这可能会非常缓慢。 因此,有一些替代办法:

  1. If you re on linux, use signalfd. You can block all signals once and redirect them to a file descriptor, then handle them whenever it s safe to do so.
  2. Otherwise (or if async signal handling is important), you can defer signals in userspace. Before entering your critical section, set a volatile flag. In your signal handler, check for this flag; if you see it, write() to a pipe the signal number and immediately return. In your signal handler, check back for a signal on this pipe, and re-raise the signal at that point.




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