Hi, Say I have two process p1,p2 runnning as a part of my application. Say p1 is running initially executing function f1() and then f1() calls f2().With the invocation of f2() process p2 starts excuting What I want to confirm is it that :- 1)Do we have seperate stack for different process? 2)Do we have seperate heap for different proc...
Hi I am developing an android app and as I read all around and learned for myself, I cant have a lot of images on the screen at the same time or I will get an exception. The question is how many images or how many KB in images or how many layouts/images can I have at the same time in the screen. I know this is not the only thing that...
I've got a bare minimum Adobe Air application; it's basically a s:SkinnableContainer inside a mx:WindowedApplication. I have a 6000 x 9000 pixel PNG image (~3.20MB) that I want to show in the SkinnableContainer. Note that the s:SkinnableContainer is a tag from Flex 4 Beta3 (spark components). Background Before I explain the problem, a ...
I need to have very fast access to a big Map - several millions of entries. Is it worth using an SQLite in-memory database to keep that map as opposed to just having that HashMap in memory? ...
I'm trying to figure out what would happened if I try to free a pointer "from the middle" for example, look at the following code: char *ptr = (char*)malloc(10*sizeof(char)); for (char i=0 ; i<10 ; ++i) { ptr[i] = i+10; } ++ptr; ++ptr; ++ptr; ++ptr; free(ptr); I get a crash with an Unhandled exception error msg. I want to understand...
On page 42 of Code Code complete there's a checklist of requirement items you might want to consider during a requirement phase. On of the items (near the bottom of the list) says Are minimum machine memory and free disk space specified Has this ever been a requirement in any project you did and how did you define such a requirement befo...
I'm fairly new to OpenCL so please bear with me. In the first iteration of my code, I used basic memory buffers for large datasets and declared them global. However now that I'm looking to improve the timing, I wanted to use texture memory for this. In the CUDA version, we use cudaBindTexture and tex1Dfetch to obtain the data for a larg...
Using memcpy() when source and destination overlap can lead to undefined behaviour - in those cases only memmove() can be used. But what if I know for sure buffers don't overlap - is there a reason to use specifically memcpy() or specifically memmove()? Which should I use and why? ...
//opening DB if(sqlite3_step(statement) == SQLITE_ROW) result = [NSString stringWithUTF8String:(char*)sqlite3_column_text(statement,0)]; //! else result nil; return result; //close DB ...
Hello, is there an API or profiler application that can track the video memory usage of my application? I am using C++/OpenGL on Windows, but I am open to suggestions on other platforms as well. ...
I want to create a shared memory between two process. I used fork(). A child tries to change this shared memory and mother creates another child so new child tries to change same memory so on. here is my code in C programing. (ubuntu) mylist ch=NUL; f=fork(); if(!f){ pba=shmget(KEYSHM,sizeof(char),0); /*created shared memory*/ ...
I understand how malloc() works. My question is, I'll see things like this: #define A_MEGABYTE (1024 * 1024) char *some_memory; size_t size_to_allocate = A_MEGABYTE; some_memory = (char *)malloc(size_to_allocate); sprintf(some_memory, "Hello World"); printf("%s\n", some_memory); free(some_memory); I omitted error checking for the sak...
Hello, I'm working on a video game witch require high performance so I'm trying to setup a good memory strategy or a specific part of the game, the part that is the game "model", the game representation. I have an object containing a whole game representation, with different managers inside to keep the representation consistent, followi...
I have such a code: [self performSelectorInBackground:@selector(indicator) withObject:nil]; [self mail]; //opening my controller of e-mail sending - (void)indicator { [actView startAnimating]; } This works fine, but i'm afraid of thread safety. I'm not allocating memory in a second thread, but smth tell's me that's too simple:) ...
I attended interview for samsung. They asked lot of questions on memory layout of the program. I barely know anything about this. I googled it "Memory layout of an executable program". "Memory layout of process". I'm surprised to see that there isn't much info on these topics. Most of the results are forum queries. I just wonder why? ...
I want to search some memory range for a specific byte pattern. Therefore, my approach is to build a function void * FindPattern (std::vector<byte> pattern, byte wildcard, void * startAddress, void * endAddress); using the Boyer-Moore-Horspool algorithm to find the pattern in the memory range. The wildcard byte stays for some sp...
Sorry for long description, however the questions aren't so easy... My project written without GC. Recently I found a memory leak that I can't find. I did use new Xcode Analyzer without a result. I did read my code line by line and verified all alloc/release/copy/autorelease/mutableCopy/retain and pools... - still nothing. Preamble: St...
A question yesterday about doubled-checked locking started a chain of thoughts that left me unsure about a simple situation. In the following code, is it possible to hit the printf of “No longer in sync”? In this simple example, the values would likely be on the same cache line, so I think it would be less likely (assuming the possibili...
I need to cast a boolean as an object, or NSKeyedArchiver throws a memory access error. What's the best way to do this? ...
I got some huge files I need to parse, and people have been recommending mmap because this should avoid having to allocate the entire file in-memory. But looking at 'top' it does look like I'm opening the entire file into the memory, so I think I must be doing something wrong. 'top shows >2.1 gig' This is a code snippet that shows what...