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bpftrace教程【官方】 - 操作系统(内核) - 清泛网 - 专注C/C++及内核技术

...\n", comm, str(args->filename)); }' Attaching 1 probe... snmp-pass /proc/cpuinfo snmp-pass /proc/stat snmpd /proc/net/dev snmpd /proc/net/if_inet6 ^C 这里我们跟踪文件打开的时候打印进程名和文件名。 该命令开始是tracepoint:syscalls:sys_enter_openat: 这个是t...
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MongoDB与内存 - 大数据 & AI - 清泛网移动版 - 专注C/C++及内核技术

...MongoDB是如何使用内存的,答案自然就清楚了。 据说带着问题学习更有效,那就先看一个MongoDB服务器的top命令结果: shell> top -p $(pidof mongod) Mem: 32872124k total, 30065320k used, 2806804k free, 245020k buffers Swap: 2097144k total, 100k used...
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C++特化模板函数的符号多重定义错误问题 - C/C++ - 清泛网 - 专注C/C++及内核技术

C++特化模板函数的符号多重定义错误问题error LNK2005: "void __stdcall SerializeElements<class CLogEvent> ...fatal error LNK1169: 找到一个或多个多重定义的符号.我...特化模板函数SerializeElements时,报重复定义的错误,如下: error LNK2005: "void __std...
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Detect iPad users using jQuery?

...ser agent strings from iOS devices: # iOS Safari iPad: Mozilla/5.0 (iPad; CPU OS 5_1 like Mac OS X) AppleWebKit/534.46 (KHTML, like Gecko) Version/5.1 Mobile/9B176 Safari/7534.48.3 iPhone: Mozilla/5.0 (iPhone; CPU iPhone OS 5_0 like Mac OS X) AppleWebKit/534.46 (KHTML, like Gecko) Version/5.1 Mobil...
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Is there a sleep function in JavaScript? [duplicate]

... A naive, CPU-intensive method to block execution for a number of milliseconds: /** * Delay for a number of milliseconds */ function sleep(delay) { var start = new Date().getTime(); while (new Date().getTime() &lt; start + del...
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What is the difference between concurrency, parallelism and asynchronous methods?

..., which means that it processes multiple sub-tasks of a task in multi-core CPU at same time. An application can be neither parallel – nor concurrent, which means that it processes all tasks one at a time, sequentially. An application can be both parallel – and concurrent, which means that it p...
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C++字符串截断时中文的处理问题(中文被截断怎么处理?) - C/C++ - 清泛网...

C++字符串截断时中文的处理问题(中文被截断怎么处理?) 防止后台错误消息中汉字双字节被截断出现乱码if (pRspMsg->RspMsg.buf[pRspMsg->RspMsg.Length() - 2] & 0x80) pRspMsg->Rsp...// 防止后台错误消息中汉字双字节被截断出现乱码 if (pRs...
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关于 __VA_ARGS__ 宽字符版本的问题 - C/C++ - 清泛网 - 专注C/C++及内核技术

关于 __VA_ARGS__ 宽字符版本的问题在写一个可变参数的记录日志函数,考虑到宽字符(Unicode版本)时:#define WIDEN2(x) L ## x#define WIDEN(x) WIDEN2(x)#define __...在写一个可变参数的记录日志函数,考虑到宽字符(Unicode版本)时: #defin...
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MFC中使用CSplitterWnd分割窗口后视图大小的问题 - C/C++ - 清泛网 - 专注C/C++及内核技术

MFC中使用CSplitterWnd分割窗口后视图大小的问题使用CSplitterWnd对框架窗口进行分割之后需要根据需求设置每个分割窗口的大小,但是在通过createView(...)设置大小时,往往起不到想要的结...使用CSplitterWnd对框架窗口进行分割之后需要...
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MFC中主窗口和子窗口的菜单问题,如何统一显示MDI主窗体菜单? - C/C++ - ...

MFC中主窗口和子窗口的菜单问题,如何统一显示MDI主窗体菜单?在 MDI 应用程序中,每一个子窗体的菜单都显示在 MDI 窗体上,而不是在子窗体本身。当子窗体有焦点时,该子窗体的菜单(如果有的话)就... 在 MDI 应用程序...