大约有 40,000 项符合查询结果（耗时：0.0297秒） [XML]
How do I choose between Semaphore and SemaphoreSlim?
...uld be used when "wait times are expected to be very short". That would usually dovetail nicely with the idea that the slim version is more lightweight for most of the trade offs.
share
|
improve th...
Are there any smart cases of runtime code modification?
...some Unices.
Sometimes code is translated into code at runtime (this is called dynamic binary translation):
Emulators like Apple's Rosetta use this technique to speed up emulation. Another example is Transmeta's code morphing software.
Sophisticated debuggers and profilers like Valgrind or Pin u...
Stack smashing detected
...
Stack Smashing here is actually caused due to a protection mechanism used by gcc to detect buffer overflow errors. For example in the following snippet:
#include <stdio.h>
void func()
{
char array[10];
gets(array);
}
int main(int argc,...
String literals: Where do they go?
I am interested in where string literals get allocated/stored.
8 Answers
8
...
Is gcc's __attribute__((packed)) / #pragma pack unsafe?
...
Yes, __attribute__((packed)) is potentially unsafe on some systems. The symptom probably won't show up on an x86, which just makes the problem more insidious; testing on x86 systems won't reveal the problem. (On the x86, misaligned accesses are handled in hardwa...
How can I output a UTF-8 CSV in PHP that Excel will read properly?
...l for Mac does not currently support UTF-8
Update, 2017: This is true of all versions of Microsoft Excel for Mac before Office 2016. Newer versions (from Office 365) do now support UTF-8.
In order to output UTF-8 content that Excel both on Windows and OS X will be able to successfully read, you w...
How to show the last queries executed on MySQL?
Is there any query/way to show the last queries executed on ALL servers?
10 Answers
...
When should we use mutex and when should we use semaphore
... to sleep till you release the mutex.
Spinlock:
Use a spinlock when you really want to use a mutex but your thread is not allowed to sleep.
e.g.: An interrupt handler within OS kernel must never sleep. If it does the system will freeze / crash. If you need to insert a node to globally shared linke...
What are the details of “Objective-C Literals” mentioned in the Xcode 4.4 release notes?
...ew ObjC literals were discussed in multiple WWDC 2012 sessions. I intentionally didn't remove the the filenames and the time of each slide so you can find them for yourself if you feel like. They are essentially the same thing as stated in this post, but there are also a few new things that I'll me...
Postgres - FATAL: database files are incompatible with server
...an run the below command to upgrade your postgres data directory retaining all data:
brew postgresql-upgrade-database
The above command is taken from the output of brew info postgres
share
|
impr...