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How can I know how many free bits are there in a pointer?


How can I know how many free bits are there in a pointer?

By : Rahul Lawand
Date : November 22 2020, 10:33 AM
I wish this helpful for you Many recommend against using tag bits in the pointers (and so do I).
If you insist on doing that, use only the two (or perhaps three) lowest bits of pointers, and preferably write your own malloc-like allocator to ensure it.
code :


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Is it necessary to free sub-pointer before calling realloc on pointer-to-pointer array to shrink its size?

Is it necessary to free sub-pointer before calling realloc on pointer-to-pointer array to shrink its size?


By : user3867795
Date : March 29 2020, 07:55 AM
wish help you to fix your issue Yes, you have to free all pointers if the reallocated array will have size that is less than the original size. For example
code :
for (i = 50; i < len; i++)
{
    free(arr[i]);
}

char** temp = realloc(arr, 50 * sizeof(char*));
Error invalid pointer when I use free() to free a malloced pointer

Error invalid pointer when I use free() to free a malloced pointer


By : liweiy
Date : March 29 2020, 07:55 AM
Does that help I can't free this pointer after using it in my function. It gives me this error message. The function should check a trie dictionary for if a word is spelled right or wrong. And root is the first trie node. , Take a closer look at these two line:
code :
wordTriePtr cursor=(wordTriePtr) malloc(sizeof(wordTrie));
cursor=root;
cursor = cursor->children[path]
int a = 5;
a = 10;
compilation error in C pointer working in 32 bits, not in 64 bits

compilation error in C pointer working in 32 bits, not in 64 bits


By : shiyanjibond
Date : March 29 2020, 07:55 AM
it should still fix some issue As mentionned in the comments, you should:
include the proper headers (stdlib.h and string.h)
code :
if (!(vhome = (char *)getenv("VHOME"))){
    fprintf(stderr, "getenv(\"VHOME\") returned NULL\n");
    return -1;
}
Homework help, segmentation fault, double free or corruption, free(): invalid pointer

Homework help, segmentation fault, double free or corruption, free(): invalid pointer


By : user2542083
Date : March 29 2020, 07:55 AM
like below fixes the issue Looking at all three stack traces, the common area they all have that is your code (before getting lost in the world of vectors) is Grid::addParticleToGrid, specifically the boxes[index].push_back(param); line. Since boxes[index] is a std::vector, and vectors are not thread safe, you're getting the same index value in multiple threads, resulting in multiple threads trying to modify the vector at the same time.
Since this is a homework problem, I'll leave it as an "exercise for the reader" to figure out how to fix the problem.
How to force malloc to return a 32 bits like pointer on a 64 bits system?

How to force malloc to return a 32 bits like pointer on a 64 bits system?


By : YJK99
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further Best option: get the author of this buggy program to fix their code to be 64-bit clean, or use Linux x32 for 64-bit registers but 32-bit pointers.
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