unsafe

Refused to set unsafe header “Connection”

由 淺唱寂寞╮ 提交于 2019-12-30 10:24:29
问题 I am working on a cross platform application that targets Android and iOS platforms. I am using jQuery 1.9.1, Jquery Mobile 1.3.1 and Phonegap 2.8.0. I want to send an ajax request and set the request headers "Connection" and "Keep-Alive". On Android Phones with OS greater than 4.1 (Whose default browser is Chrome) I get an error which says "Refused to set unsafe header "Connection"". I am able to send such requests on lower end devices and even on iPhones. Can Anyone Please help me out. I

**BUSTED** How to speed up a byte[] lookup to be faster using sun.misc.Unsafe?

由 試著忘記壹切 提交于 2019-12-30 08:29:46
问题 I am experimenting with Unsafe to iterate over memory instead of iterating over the values in a byte[]. A memory block is allocated using unsafe. The memory is sufficient to hold 65536 byte values. I AM TRYING THIS: char aChar = some character if ((byte) 0 == (unsafe.getByte(base_address + aChar) & mask)){ // do something } INSTEAD OF: char aChar = some character if ((byte) 0 == ( lookup[aChar] & mask )){ // do something } I thought Unsafe could access the memory faster than using a regular

fixed block in .net

由 空扰寡人 提交于 2019-12-24 12:22:03
问题 I am a bit confused on when fixed block is required. I have example which gives me a contradicting scenario below: enum RoomType { Economy, Buisness, Executive, Deluxe }; struct HotelRoom { public int Number; public bool Taken; public RoomType Category; public void Print() { String status = Taken ? "Occupied" : "available"; Console.WriteLine("Room {0} is of {1} class and is currently {2}", Number, Category, status); } } I have made a function which will take a pointer to a HotelRoom private

How to run unsafe code in “visual studio code”?

由 ぃ、小莉子 提交于 2019-12-24 08:31:52
问题 I am using Visual studio code and when I try to run an unsafe code it throws the following error ""message": Unsafe code may only appear if compiling with /unsafe" and as in visual studio, it does not have option like project->properties. 回答1: unsafe (C# Compiler Options) To set this compiler option in the Visual Studio development environment Open the project's Properties page. Click the Build property page. Select the Allow Unsafe Code check box. To add this option in a csproj file Open the

Monotouch floating point pointer throws NullReferenceException when not 4-byte aligned

由 ↘锁芯ラ 提交于 2019-12-24 02:23:16
问题 I'm facing a problem I just can't understand. While playing with unsafe pointers in C# with Monotouch, I get a NullReferenceException on device (ARM), but I can't explain why, let's see some code var rand = new Random(); var buffer = new byte[2 * 1024 * 1024]; rand.NextBytes(buffer); fixed (byte* ptr = buffer) { var ptr2 = ptr + 982515; //This works var bfr = new byte[8]; for (int i = 0; i < 8; i++) bfr[i] = ptr2[i]; var v = BitConverter.ToDouble(bfr, 0); //This throws a

Help translating Reflector deconstruction into compilable code

由 岁酱吖の 提交于 2019-12-24 01:24:47
问题 So I am Reflector-ing some framework 2.0 code and end up with the following deconstruction fixed (void* voidRef3 = ((void*) &_someMember)) { ... } This won't compile due to ' The right hand side of a fixed statement assignment may not be a cast expression ' I understand that Reflector can only approximate and generally I can see a clear path but this is a bit outside my experience. Question: what is Reflector trying to describe to me? Update: Am also seeing the following fixed (IntPtr*

java.util.concurrent.locks.LockSupport

由 我与影子孤独终老i 提交于 2019-12-23 09:49:18
【推荐】2019 Java 开发者跳槽指南.pdf(吐血整理) >>> 要学习JAVA中是如何实现线程间的锁，就得从LockSupport这个类先说起，因为这个类实现了底层的一些方法，各种的锁实现都是这个基础上发展而来的。这个类方法很少，但理解起来需要花费一点时间，因为涉及了很多底层的知识，这些都是我们平时不关心的。 上源代码： package java.util.concurrent.locks; import java.util.concurrent.*; import sun.misc.Unsafe; public class LockSupport { private LockSupport() {} // Cannot be instantiated. // Hotspot implementation via intrinsics API private static final Unsafe unsafe = Unsafe.getUnsafe(); private static final long parkBlockerOffset; static { try { parkBlockerOffset = unsafe.objectFieldOffset (java.lang.Thread.class.getDeclaredField("parkBlocker"));

Marshal.PtrToStringUni() vs new String()?

由 假装没事ソ 提交于 2019-12-23 08:47:10
问题 Suppose i have a pointer of type char* to unicode string, and i know the length: char* _unmanagedStr; int _unmanagedStrLength; and i have 2 ways to convert it to .NET string: Marshal.PtrToStringUni((IntPtr)_unmanagedStr, _unmanagedStrLength); and new string(_unmanagedStr, 0, _unmanagedStrLength); In my tests, both calls gives me exactly the same result, but the new string() is like 1.8x times faster than Marshal.PtrToStringUni() . Why is that performance difference? Is there any another

What is an unsafe function in Haskell?

由 半城伤御伤魂 提交于 2019-12-23 07:30:58
问题 I believe that an unsafe function is a function that says that it will return a value of some type, but that it can actually throw an exception and end the execution therefore not returning any value at all, but I'm not sure. Or could it be that an unsafe function is a function that can return a value of other type than the declared in the signature? Wouldn't that be a weakly typed function? Or are weakly typed and unsafe synonyms in Haskell? This may be a silly question, but I couldn't find

Is GC.KeepAlive required here, or can I rely on locals and arguments keeping an object alive?

由 人走茶凉 提交于 2019-12-23 07:12:03
问题 I have a bunch of methods that take the WPF's WriteableBitmap and read from its BackBuffer directly, using unsafe code. It's not entirely clear whether I should use GC.KeepAlive whenever I do something like this: int MyMethod(WriteableBitmap bmp) { return DoUnsafeWork(bmp.BackBuffer); } On the one hand, there remains a reference to bmp on MyMethod 's stack. On the other, it seems like relying on implementation detail - this could compile to a tail call, for example, keeping no reference to
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