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When should we use mutex and when should we use semaphore
...ut 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 linked list from the interrupt handler, acquire a spinlock - insert node - release spinlock.
...
Unknown file type MIME?
...
@SampoSarrala I read RFC-7231 a little differently: "If a Content-Type header field is not present, the recipient MAY either assume a media type of "application/octet-stream" ([RFC2046], Section 4.5.1) or examine the data to...
How do you print in a Go test using the “testing” package?
...s that are not failing, you have to provide go test the -v flag (v for verbosity). More details on testing flags can be found here: https://golang.org/cmd/go/#hdr-Testing_flags
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C++常用排序算法汇总 - C/C++ - 清泛网 - 专注C/C++及内核技术
...;
}
}
/*
第二种形式的选择排序，减少了元素互换的操作
选择排序后的顺序为从小到大
*/
void Select_Sort2(int *arr,int len)
{
int i,j,min;
for(i=0;i<len;i++)
{
min = i; //用来记录每一趟比较的最小值的位置
for(j=i+1;j<len;j++)
if...
How to check which locks are held on a table
...S [index/page container_id]
FROM sys.dm_tran_locks AS TL
INNER JOIN sys.dm_os_waiting_tasks AS WT
ON TL.lock_owner_address = WT.resource_address
LEFT OUTER JOIN sys.objects AS O
ON O.object_id = TL.resource_associated_entity_id
LEFT OUTER JOIN sys.partitions AS P
ON P.hobt_id = TL.resource_ass...
What are best practices that you use when writing Objective-C and Cocoa? [closed]
...onse:(NSCachedURLResponse *)cachedResponse
{
return nil;
}
I find most web calls are very singular and it's more the exception than the rule you'll be wanting responses cached, especially for web service calls. Implementing the method as shown disables caching of responses.
Also of interes...
Why should C++ programmers minimize use of 'new'?
...ith no apparent benefit.
Why you should use automatic storage as often as possible
Basically, the last paragraph sums it up. Using automatic storage as often as possible makes your programs:
faster to type;
faster when run;
less prone to memory/resource leaks.
Bonus points
In the referenced quest...
Sending files using POST with HttpURLConnection
...example on how to send a bitmap "file" (actually an in-memory stream) via POST to an Apache HTTP server. I'm not interested in cookies or authentication or anything complicated, but I just want to have a reliable and logic implementation. All the examples that I've seen around here look more like "l...
What does CultureInfo.InvariantCulture mean?
...nstalledUICulture so the default CultureInfo is depending on the executing OS's settings. This is why you should always make sure the culture info fits your intention (see Martin's answer for a good guideline).
CultureInfo.InvariantCulture Example
CultureInfo.InvariantCulture on StackOverflow
Cult...
Windows x64编程中寄存器的使用 - C/C++ - 清泛网 - 专注C/C++及内核技术
...从 r11 处得到 rflags 值，因此在进入 system services routine（系统服务例程）前，或者在系统服务例程中的第1个任务是 rcx 与 r11 寄存器，以便 sysret 返回。
在 Win64 里，r10 寄存器充当保存 rcx 值的作用，如下：
NtCallbackReturn:
00000000...