Are there any counted semaphores in Linux?
What I'开发者_StackOverflow中文版m wanting to do is keep track of how many readers a resource has.
POSIX semaphores
You might also consider the Boost C++ Libraries. Boost has a bunch of different threading and synchronization related components, including an abstraction for semaphores, and also a good implementation of the ReaderWriterLock. Check out this SO post, regarding Boost ReaderWriterLock.
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It seems to me Apple won\'t allow this, but I need to make sure. For an app we\'re building, we want to ask the user to enter payment information (including credit card details) to pay for tickets. T
I need to generate an XML output using Perl code.I\'m trying not to use any libraries,as it\'s very simple, temporary XML that gets used by another step in the process.
是否在对方手机上显示已读，是由用户自行设置的。依次打开iPhone的“设置-信息”，会有一个“发送已读回执”的选项。将其打开，对方就能看到你，是否已经阅读了本条iMessage信息。将其关闭，对方就看不到。
微信重新建群怎么开发者_Go百科建？ 产品名称：苹果手机 产品型号：iPhone 11 系统版本：iOS 13
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