Suppose you are a fan of auto-racing and want to figure out which drivers are likely to perform well in an upcoming race. Luckily you have access to a...
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其他好文 时间:
2015-01-11 06:11:43
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348
Currently, the server.js is going way too long. In the real world application, it is likely that we are going to deal with more routers, whichi means ...
Event Delivery: The Responder Chain 事件分发--响应链When you design your app, it’s likely that you want to respond to events dynamically. For example, a touc...
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移动开发 时间:
2014-12-25 16:07:18
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308
The log or differential backup cannot be restored because no files are ready to rollforward.If you have found this page, it is likely that you encount...
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其他好文 时间:
2014-11-21 12:28:46
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224
Adventuring Time Discover 17 of 23 biomes.Biomes are the different types of environments explorable in Minecraft, you will likely get this trophy with...
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其他好文 时间:
2014-11-05 09:17:35
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178
ikely()与unlikely()在2.6内核中,随处可见,那为什么要用它们?它们之间有什么区别呢?首先明确:if (likely(value))等价于if (value)if (likely(a>b)) {fun1();if (unlikely(value))等价于if (value)也就是说l...
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其他好文 时间:
2014-10-30 09:27:20
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162
在看代码的时候看到两个宏函数:likely() unlikely()
#define likely(x) __builtin_expect(!!(x), 1)
#define unlikely(x) __builtin_expect(!!(x), 0)
__builtin_expect()大致作用是处理分支预测,让编译器编译的时候可以做一些优化,优化可能性大的分支程序
if( like...
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系统相关 时间:
2014-10-19 17:12:40
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230
以形如 _fontValueChangedBlock = ^(){ [self.fontSmallButton addTarget:self action:@selector(btnFontSmallClicked) forControlEvents:UIContr...
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其他好文 时间:
2014-10-13 16:12:29
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170
在阅读linux源代码的时候,我们经常会发现likely和unlikely,这两个宏语句定义在compiler.h下,#definelikely(x) __builtin_expect(!!(x),1)#defineunlikely(x) __builtin_expect(!!(x),0)这里我们需要先了解__builtin_expect:#define__builtin_expect(x,expected_value)(x)所..
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系统相关 时间:
2014-09-29 17:40:51
阅读次数:
321
在阅读linux源代码的时候,我们经常会发现likely和unlikely,这两个宏语句定义在compiler.h下,#definelikely(x) __builtin_expect(!!(x),1)#defineunlikely(x) __builtin_expect(!!(x),0)这里我们需要先了解__builtin_expect:#define__builtin_expect(x,expected_value)(x)所..
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系统相关 时间:
2014-09-29 17:24:01
阅读次数:
256