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__attribute__ - C/C++ - 清泛网 - 专注C/C++及内核技术
...了！
加上__attribute__((noreturn))则可以很好的处理类似这种问题。把
extern void myexit();修改为：
extern void myexit() __attribute__((noreturn));之后，编译不会再出现警告信息。
__attribute__ const
该属性只能用于带有数值类型参数的函数上...
Why is unsigned integer overflow defined behavior but signed integer overflow isn't?
...t used. C implementations usually used the same representation used by the CPU - so the overflow behavior followed from the integer representation used by the CPU.
In practice, it is only the representations for signed values that may differ according to the implementation: one's complement, two's c...
How dangerous is it to access an array out of bounds?
...user privileges, a malfunctioning program can consume excessive resources (CPU, memory, disk), possibly bringing down the entire system. A lot of malware (viruses, etc.) exploits buffer overruns to gain unauthorized access to the system.
(One historical example: I've heard that on some old systems ...
Check synchronously if file/directory exists in Node.js
...nchronous calls. Calls into the I/O subsystem take significant time from a CPU's point of view. Note how easy it is to call lstat rather than lstatSync:
// Is it a directory?
lstat('/the/path', function(err, stats) {
if (!err && stats.isDirectory()) {
// Yes it is
}
});
Bu...
Fastest sort of fixed length 6 int array
... are single cycle instructions like add/subtract), but for a normal scalar CPU your method looks better.
– Paul R
May 8 '10 at 16:13
2
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Why is f(i = -1, i = -1) undefined behavior?
...signment cannot be interleaved. It might be optimal to do so, depending on CPU architecture. The referenced page states this:
If A is not sequenced before B and B is not sequenced before A, then
two possibilities exist:
evaluations of A and B are unsequenced: they may be performed in ...
Measure time in Linux - time vs clock vs getrusage vs clock_gettime vs gettimeofday vs timespec_get?
...e. It is present in C89 and later. At one time this was supposed to be the CPU time in cycles, but modern standards like POSIX require CLOCKS_PER_SEC to be 1000000, giving a maximum possible precision of 1 µs. The precision on my system is indeed 1 µs. This clock wraps around once it tops out (th...
Why are elementwise additions much faster in separate loops than in a combined loop?
...
OK, the right answer definitely has to do something with the CPU cache. But to use the cache argument can be quite difficult, especially without data.
There are many answers, that led to a lot of discussion, but let's face it: Cache issues can be very complex and are not one dimension...
Why aren't programs written in Assembly more often? [closed]
...ur old code can easily make use of the new instructions.
What if the next CPU has twice as many registers?
The converse of this question would be: What functionality do compilers provide?
I doubt you can/want to/should optimize your ASM better than gcc -O3 can.
...
What is uint_fast32_t and why should it be used instead of the regular int and uint32_t?
...han 32-bit? I always thought if there's less bits, there will be less bits CPU has to work on, thus faster. What am I missing here?
– Shane Hsu
Sep 3 '13 at 11:24
12
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