memory allocation in subroutine Post: 302320567

10 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers

memory allocation

I would like to know how I could allocate some more memory to a process. Please note that I am not the root user.

2. HP-UX

Hi all, I have a HP-UX Server with 4 gigabytes of physical RAM. When I use the 'Glance' utility to see what my memory utilization is, my memory usage shows up maxed out at 99%. I shut off all the known processes that I'm running on that box and the memory utilization is still at 78% (with Swap...

3. Programming

Dynamic memory allocation

Hi, I am trying to process line by line of a file. But I should not be allocating static allocation for reading the contents of the file. The memory should be dynamically allocated. The confusion here is how do I determine the size of each line, put it into a buffer with the memory allocated...

4. Programming

Memory allocation in C

Hi Experts I need some help in static memory allocation in C. I have a program in which I declared 2 variables, one char array and one integer. I was little surprised to see the addresses of the variables. First: int x; char a; printf("%u %u\n', &x, a); I got the addresses displayed...

5. Programming

Dynamic Memory Allocation

Hello Guys I have a small confusion in the dynamic memory allocation concept. If we declare a pointer say a char pointer, we need to allocate adequate memory space. char* str = (char*)malloc(20*sizeof(char)); str = "This is a string"; But this will also work. char* str = "This...

6. Programming

Memory Allocation Query

When we dynamically allocate the memory say 100 integers say int *x = new int(1000); then does entire chunk of memory gets allocated at once after the completion of the statement? I mean will the the concept of page fault come into picture over here?

7. Shell Programming and Scripting

memory allocation to a variable

hello all.. i'm a beginner in shell scripting. I need to know what is really happening when we are creating a variable in shell scripting? how memory is allocated for that variable?

8. Programming

memory allocation for string in C

hi in the following code, how the memory is allocated for a1 which holds the values of a2 after cpy function call. #include <stdio.h> #include <string.h> void cpy(char* d, const char* s){ while(*d++=*s++); } main(){ char* a1; char* a2="done"; cpy(a1,a2); ...

9. Programming

C++/ROOT Memory Allocation?

Hello, I am new to C++ programming, so I'm still getting a feel for things. I recently wrote a simple C++ program (to be used as a ROOT Macro) to conduct a statistical analysis of a varied version of the Monty Hall problem (code below). Basically, the programs runs a few simple calculations to...

10. UNIX for Dummies Questions & Answers

Memory allocation problem

I am using ubuntu. I have written a program to calculate prime factors. it works perfectly fine till entered number is less than 9989 (or so ) but when one enters a number higher than that, for example 15000, it does not work. Can anyone guide me whats the problem ? although new codes are welcome,...

LEARN ABOUT PLAN9

malloc_usable_size

MALLOC_USABLE_SIZE(3)					     Linux Programmer's Manual					     MALLOC_USABLE_SIZE(3)

NAME

       malloc_usable_size - obtain size of block of memory allocated from heap

SYNOPSIS

       #include <malloc.h>

       size_t malloc_usable_size (void *ptr);

DESCRIPTION

       The  malloc_usable_size()  function returns the number of usable bytes in the block pointed to by ptr, a pointer to a block of memory allo-
       cated by malloc(3) or a related function.

RETURN VALUE

       malloc_usable_size() returns the number of usable bytes in the block of allocated memory pointed to by ptr.  If ptr is NULL, 0 is returned.

ATTRIBUTES

       For an explanation of the terms used in this section, see attributes(7).

       +---------------------+---------------+---------+
       |Interface	     | Attribute     | Value   |
       +---------------------+---------------+---------+
       |malloc_usable_size() | Thread safety | MT-Safe |
       +---------------------+---------------+---------+
CONFORMING TO

       This function is a GNU extension.

NOTES

       The value returned by malloc_usable_size() may be greater than the requested size of the allocation because of alignment and  minimum  size
       constraints.   Although	the excess bytes can be overwritten by the application without ill effects, this is not good programming practice:
       the number of excess bytes in an allocation depends on the underlying implementation.

       The main use of this function is for debugging and introspection.

SEE ALSO

       malloc(3)

COLOPHON

       This page is part of release 4.15 of the Linux man-pages project.  A description of the project, information about reporting bugs, and  the
       latest version of this page, can be found at https://www.kernel.org/doc/man-pages/.

GNU
								    2017-09-15						     MALLOC_USABLE_SIZE(3)

10 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers