Why not the getpid() method defined in unistd.h? #include <unistd.h> int main(){ int pid = getpid(); int parentsPID = getppid(); return 0; } 1 solved How to find the PID of a C code during compilation time? [closed]
In the real world, dynamic allocation is slower than automatic allocation. That’s true — at least in general. That doesn’t mean that dynamic allocation is too slow. The only way to determine that is to profile your code. Until you have done that, it is impossible to say that you should abandon dynamic allocation because … Read more
global variables ——-> data static variables ——-> data constant data types —–> code and/or data. Consider string literals for a situation when a constant itself would be stored in the data segment, and references to it would be embedded in the code local variables(declared and defined in functions) ——–> stack variables declared and defined in … Read more
For screenshot #2 it looks like you’re not releasing the CGImageRef object. For this, to clean this up you should use: CGImageRelease(image); …when you’re done using the CGImageRef. More info on this (and how it differs from CFRelease) can be found at this question: Releasing CGImage (CGImageRef) Mind you, even if you’re using ARC you … Read more
What algorithms are used? Java uses TLAB (Thread Local Allocation Buffers) for “normal” sized objects. This means each thread grab some Eden space and turns this grab of memory into individual objects. Thus small objects are typically sequential in memory for that thread, except if a new chunk of memory needs to be grabbed. Large … Read more
The API is confusing: What is namelen ? is it the length of the initial prefix of name that is the name of the student? In this case you should allocate one extra byte for the null terminator and copy the name appropriately. is it the maximum length for the student name? Again if this … Read more
Why can you free/delete an object that was returned, but you can’t free/delete an object that was entered through a parameter? solved Why can you free/delete an object that was returned, but you can’t free/delete an object that was entered through a parameter?
Okay I will explain the problem. Computers has limited memory ( modern personal one has about 8 Gigabytes). Operating systems and apps need the memory so their code can be loaded into it and executed by the CPU. Modern systems split the memory into equally sized chunks called pages, the actual page size differs from … Read more
I’m not sure what you mean by “correct”; your code is not correct at least in the sense mentione by @SamVarshavchik, and which a compiler will tell you about: a.cpp: In function ‘int getFifoData(unsigned char*)’: a.cpp:20:29: warning: ISO C++ forbids variable length array ‘tBuff’ [-Wvla] uint8_t tBuff[txBuf.size()]; If you want to understand why C++ has … Read more
You should allocate an array of chars, like so: char *CopyOf(const char *str) { char *copy = new char[strlen(str) + 1]; strcpy(copy, str); return copy; } Note that I used brackets, not parentheses. What you were doing with parentheses was initializing a single new char with the value strlen(str) + 1. Then you overran the … Read more
Examples When a variable goes out of scope void foo() { MyClass C; C.callSomeMethod(); } // C is here going out of scope or a dynamically allocated variable is explicitly deleted using the delete keyword void foo() { MyClass* C = new MyClass; // allocating on heap delete C; // deleting allocated memory … } … Read more
Look at your loop here: for(int i=0; i<3*n; i++) { all[j].h = b[i].h; all[j].w = min(b[i].w,b[i].l); all[j].l = max(b[i].w, b[i].l); j++; // increment all[j].h = b[i].l; all[j].w = min(b[i].w,b[i].h); all[j].l = max(b[i].w, b[i].h); j++; // increment again all[j].h = b[i].w; all[j].w = min(b[i].l,b[i].h); all[j].l = max(b[i].l, b[i].h); j++; // increment once again } Look at … Read more
Neither new or delete form part of ANSI C. They are part of the C++ standard. In C dynamic memory allocation on the heap is performed using malloc(), free() and associated functions which form part of the C library (rather than being native to the language itself as the new and delete operators are in … Read more
I believe you need to call pclose() on the descriptors returned from popen() in your CPUread() function. See the popen() documentation here: popen() man page on die.net I’m not sure this directly is the cause of your problem, but it is definitely a resource leak. 0 solved Memory leak with out malloc [closed]
Reference counting ‘frees’ you from always thinking about WHEN to delete an object. Anybody using the object just says, I still need it (want to retain it) or I am done with it (I release it) that makes memory management way easier and also makes the code more manageable BUT it comes at the price … Read more