I have a CUDA program that works fine, but that is currently all written in one file. I'd like to split this big file into several smaller ones, in order to make it easier to maintain and navigate. The new structure is : foo.cuh foo.cu bar.cuh bar.cu main.cu The .cuh header files contain structs and function prototypes, and the .cu f...
I am reading the standard (Numerical Recipes and GSL C versions are identical) implementation of Brent root finding algorithm, and cannot understand the meaning of variable "e". The usage suggests that "e" is supposed to be the previous distance between the brackets. But then, why is it set to "xm" (half the distance) when we use bisect...
How do I copy a buffer that would save to a ".BMP" file to the clipboard using the win32 API? I.e., I have a raw buffer of a Windows V3 Bitmap (including the header) that I can literally write() to a file and will result in a valid .BMP file, but I want to copy it to the clipboard instead. On OS X, in plain C, the code would look someth...
i am making a small library that will basically capture the standard outputs of a program (such as printf()) into a separate process/thread...this process should then perform certain tasks (lets say write these captured outputs to a file)...i am just beginning to do serious C programming so i am still learning. i wanted to know what is ...
Hello, linux gcc 4.4.1 C99 I am wondering what is the best way to test the performance of a C program. I have some functions that I have implemented. However, I could have used a different design for each function. Basically, I should want to test to see which design gives better performance. Many thanks, ...
I'm adding coroutine support to an interpreter I'm writing and I'd like to do something like the following: typedef enum { bar_stuff, bar_other } Bar; typedef enum { foo_error=-1, foo_none=0, foo_again } Foo_state; Foo_state do_foo(Bar bar,Foo_state foo) { switch(foo) { case foo_none...
What is the easiest way of parsing a comma separated list, where there can be zero elements between each token. The cstring could look like 1, 3, 4, 5, 6, 7, 8, .... But could also look like , , , , , , , , , ... I've tried something like: char *original = "1, 3, 4, 5, 6, 7, 8, ...." char *tok = strtok(original," ,") while(tok!=NU...
Hi, Our company has a set of 3d modeling softwares written in c++ with qt based gui. We are planning to offer these applications to customers to try them from a web browser. I mean to say, we need to create web interfaces for native c++ codes. Please suggest me which technology, languages should be used. If possible please give some...
I have two threads in my application. Is it possible to execute both the threads simultaneously without sleeping any thread? ...
For practice I decided to rewrite string.c in C. I can not find online (via google or other search engines) a test suite for either the entire standard or for specifically string.h More specifically I am looking to see if my strcat(), strncat(), strchr(), strrchr(), strcmp(), strncmp(), strcpy(), strncpy(), strlen(), and strstr() func...
Hi, I want to dynamically allocate a C struct: typedef struct { short *offset; char *values; } swc; Both 'offset' and 'values' are supposed to be arrays, but their size is unknown until runtime. How can I dynamically allocate memory for my struct and the struct's arrays? ...
I'm getting a strange compile warning. It's intermittent, and doesn't appear every build. I get the warning "initialization makes pointer from integer without a cast" for the following line: callbackTable *callbacks = generateLoggingCallback(); and, for completeness, this gives the same outcome callbackTable *callbacks; callbacks = g...
Going by gcc version 4.4.2, it appears that saying typedef struct foo foo; // more code here - like function declarations taking/returning foo* // then, in its own source file: typedef struct foo { int bar; } foo; is legal in C++ but not in C. Of course I have a body of code that compiles fine in C++ by using the foo type but it ...
Is there a Linux library that will enable me to tell what IP sockets are owned by what processes? I guess I'm looking for the programmatic equivalent of lsof -i. Ultimately, I want to correlate packets seen through libpcap to processes. UPDATE: A couple of people have suggested using /proc/<pid>/net/tcp and udp, but on my system, the sa...
When taken literally, it makes sense, but what exactly does it mean to be a significant character of a variable name? I'm a beginning learner of C using K&R. Here's a direct quote from the book: "At least the first 31 characters of an internal name are significant. For function names and external variables, the number may be less than ...
I'm using long double in a C program to compute 2D images of the Mandelbrot Set but wish to have further precision to zoom deeper. Are there any performance gains to be had from an arbitrary precision maths library that can restrict the amount of precision as required, rather than leaping from long double precision straight into arbitra...
The following program cannot compile in gcc. But it compiles OK with g++ and MSC++ with .c extension. #include <math.h> #include <stdio.h> int main() { double t = 10; double t2 = 200; printf("%lf\n", sqrt(t*t2)); return 0; } My system is CentOS, the version info. > gcc --version gcc (GCC) 4.1.2 20080704 (Red Hat 4.1.2-46)...
This is the code of my server: #include <stdio.h> #include <stdlib.h> #include <getopt.h> #include <string.h> #include <unistd.h> #include <errno.h> #include <sys/types.h> #include <sys/socket.h> #include <netinet/in.h> #include <arpa/inet.h> #include <sys/wait.h> #include <signal.h> int main (int argc, char **argv) //-----------------...
Can we call send from one thread and recv from another on the same socket? Can we call multiple sends parallely from different threads on the same socket? I know that a good design should avoid this, but I am not clear how these system APIs will behave. I am unable to find a good documentation also for the same. Any pointers in the d...
What do I need and how can I use threads in C on Windows Vista? Could you please give me a simple code example? ...