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  • why doesnt this program print?

    - by Alex
    What I'm trying to do is to print my two-dimensional array but i'm lost. The first function is running perfect, the problem is the second or maybe the way I'm passing it to the "Print" function. #include <stdio.h> #include <stdlib.h> #define ROW 2 #define COL 2 //Memory allocation and values input void func(int **arr) { int i, j; arr = (int**)calloc(ROW,sizeof(int*)); for(i=0; i < ROW; i++) arr[i] = (int*)calloc(COL,sizeof(int)); printf("Input: \n"); for(i=0; i<ROW; i++) for(j=0; j<COL; j++) scanf_s("%d", &arr[i][j]); } //This is where the problem begins or maybe it's in the main void print(int **arr) { int i, j; for(i=0; i<ROW; i++) { for(j=0; j<COL; j++) printf("%5d", arr[i][j]); printf("\n"); } } void main() { int *arr; func(&arr); print(&arr); //maybe I'm not passing the arr right ? }

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  • Unable to debug St9bad_alloc error. Tried reducing the size of the data structure, error still persists

    - by timtowtdi
    I get a St9bad_alloc error which I'm unable to debug. I tried reducing the size of the data structure to eliminate the possibility that I might be running out of memory but that doesn't seem to be the case. These are the relevant files:- gdb backtrace: http://pastebin.com/5hFhHXnL TraceCache.cc: http://pastebin.com/j8vK812j I can't understand how, in the backtrace it jumps from TraceCache.cc:55 to TraceCache.cc:34 whereas in my code I can't see any such path. Please let me know in case any other information is required. Thanks

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  • GC generation 3 appearing in windbg

    - by Johnv2020
    I've a dump file of a process I'm running (trying to find a memory leak) One thing I've noticed is that when I dump the bigger objects via !do windbg tells me that they are GC generation 3 ?? All of these are byte arrays so when I look at all the byte arrays in the dump I can see GC generations 0, 1, 2 & 3. Could someone explain whats going on here as I thought there was only 3 generations of GC.

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  • how to check how many bits in a byte array?

    - by newandfresh
    Im creating a download speed test, and im downloading a 800megabit file to a Byte[] in a memory stream with webClient.DownloadDataAsync(new Uri(link), memStreamArray); How can i check how many bits are in the memStreamArray while downloading? I need this so i can do a calculation on size / time to get the speed in realtime. Im planing on performing this calculation in the webClient.DownloadProgressChanged event.

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  • segmentation fault when using pointer to pointer

    - by user3697730
    I had been trying to use a pointer to pointer in a function,but is seems that I am not doing the memory allocation correctly... My code is: #include<stdio.h> #include<math.h> #include<ctype.h> #include<stdlib.h> #include<string.h> struct list{ int data; struct list *next; }; void abc (struct list **l,struct list **l2) { *l2=NULL; l2=(struct list**)malloc( sizeof(struct list*)); (*l)->data=12; printf("%d",(*l)->data); (*l2)->next=*l2; } int main() { struct list *l,*l2; abc(&l,&l2); system("pause"); return(0); } This code compiles,but I cannot run thw program..I get a segmentation fault..What should I do?Any help would be appreciated!

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  • What does "performant" software actually mean?

    - by Roddy
    I see it used a lot, but haven't seen a definition that makes complete sense. Wiktionary says "characterized by an adequate or excellent level of performance or efficiency", which isn't much help. Initially I though performant just meant "fast", but others seem to think it's also about stability, code quality, memory use/footprint, or some combination of all those. I think this is a "real" question - but if enough people reckon this is a subjective question, that's an answer in itself.

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  • How early can I call kalloc in an arm linux kernel?

    - by Isaac Sutherland
    I would like to dynamically allocate memory from the machine_init function in my arm linux kernel. Calling kalloc can result in a complete failure of the system to boot. My debugging tools are very limited so I can't give much more information regarding the failure. Simply put, is it legal to call kalloc from a machine_init function in arm linux, and, if not, is there an alternative?

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  • Using memset on structures in C++

    - by garry
    Hey guys. I am working on fixing older code for my job. It is currently written in C++. They converted static allocation to dynamic but didn't edit the memsets/memcmp/memcpy. This is my first programming internship so bare with my newbe-like question. The following code is in C, but I want to have it in C++ ( I read that malloc isn't good practice in C++). I have two scenarios: First, we have f created. Then you use &f in order to fill with zero. The second is a pointer *pf. I'm not sure how to set pf to all 0's like the previous example in C++. Could you just do pf = new foo instead of malloc and then call memset(pf, 0, sizeof(foo))? struct foo { ... } f; memset( &f, 0, sizeof(f) ); //or struct foo { ... } *pf; pf = (struct foo*) malloc( sizeof(*pf) ); memset( pf, 0, sizeof(*pf) );

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  • Python templates for huge HTML/XML

    - by newtover
    Hello, Recently I needed to generate a huge HTML page containing a report with several thousand row table. And, obviously, I did not want to build the whole HTML (or the underlying tree) in memory. As result, I built the page with the old good string interpolation, but I do not like the solution. Thus, I wonder whether there are Python templating engines that can yield resulting page content by parts.

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  • Special folders & functionality in Windows [closed]

    - by lloydsparkes
    I am using the new Virtual PC Beta on Windows 7 and I saw: The virtual machines have a special directory, but once you are in it, the VMs are shown. How can I do the same thing, with custom headings ("Machine status", "Memory", etc.) and custom toolbar buttons ("Create virtual machine")? I can't seem to find any documentation for this.

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  • [boost::filesystem] performance: is it better to read all files once, or use b::fs functions over an

    - by rubenvb
    I'm conflicted between a "read once, use memory+pointers to files" and a "read when necessary" approach. The latter is of course much easier (no additional classes needed to store the whole dir structure), but IMO it is slower? A little clarification: I'm writing a simple build system, that read a project file, checks if all files are present, and runs some compile steps. The file tree is static, so the first option doesn't need to be very dynamic and only needs to be built once every time the program is run. Thanks

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  • How can I measure the speed of code written in Java? (AI algorithms)

    - by Registered User
    Hi All, How can I measure the speed of code written in Java? I planning to develop software which will solve Sudoku using all presently available AI and ML algorithms and compare time against simple brute-force method. I need to measure time of each algorithm, I would like to ask for suggestions on what is the best way of doing that? Very important, program must be useful on any machine regardless to CPU power/memory. Thank you.

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  • How big in bytes is a DataRow

    - by JeffreyABecker
    I have a one-time process (hashing all our user passwords) written using datasets. The performance needs improvement so we've profiled the application and found that increasing the 'batch size' of the update will improve performance. I also know that if I load the entire data set into memory the application will start hitting swap and slow down. The question is: how big is a System.Data.DataRow derived class? I'd like to calculate a batch size which I know won't force the application into swap.

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  • Including a C header which declares a variable called "new"?

    - by StackedCrooked
    I'm trying to use the OpenCA library in a C++ application. However, when including the file pki_x509_data_st.h the following code fragment is encountered: typedef struct pki_x509_callbacks_st { /* ---------------- Memory Management -------------------- */ void * (*new) (void ); void (*free) (void *x ); void * (*dup) (void *x ); This won't compile because of the "new" pointer declaration. How can I make it work?

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  • AS3: why is this happening?

    - by Bin Chen
    Hi, I just encounter a strange problem: var a:ClassA = new ClassA; var b:ClassA = a; The program keeps running sometime, the a = null, b = null. The program is a complex one, I am sure that no part will touch a, and b. My question is, will the runtime(garbage collector) to collect the memory of "a" and then assign a and b to null? I am confused, thanks!

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  • Is there any way static block is executed more than once? if so then how?

    - by learner
    My Understanding Static block is executed during class loading, If a class is already loaded then there is no way to load the class other than class reloading Doubt/Question 1) Is there any time JVM reloads the class? My Understanding In Class Loading JVM loads source of the Java file, so it can not keep all thousands files source is a memory, it should discard the rarely used code and reload again when it is necessary and during reload JVM is not initializing static variables and locks again(may be using some tracking mechanism) Doubt/Question 2) If my above understanding is incorrect then please correct me

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  • Can I prevent IMAP from grabbing files over X mb using PHP?

    - by mike
    I'm building a little script that will connect to an IMAP account and grab the content of the email and also the attachments. It works well for the most part, but when a really large file comes in, it causes the script to time out. Is there any way that I can check the file size before trying to grab it? I think that would be the simplest solution. Otherwise, I may have to upgrade to a server that has more memory.

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