When you send a pointer you are NOT sending data. You are sending an address.
You are passing a reference, not the string of characters or binary data array you are pointing to. The reference on the other node is pointing to nothing. That is why you segfault. Unless your method is smart enough to create storage on the remote side and copy the array over there.
This User Gave Thanks to jim mcnamara For This Post:
I have a struct as follows...
struct A
{
int a;
ucontext_t X; //ucontext_t is another structure
}
How do I define a pointer to the above structure variable X of the type ucontext_t from within another function?
eg. void foo()
{
struct A a;
/////WHAT COMES IN... (1 Reply)
I am using a structure defined as follows
struct gene_square
{
double *x;
double *y;
};I have class, with a member function which is a pointer of this type:
gene_square* m_Genes;I am allocating memory in the constructors like this:
m_Genes = new gene_square;
for (ii=0;... (1 Reply)
If one wants to get a start address of a array or a string or a block of memory via a function, there are at least two methods to achieve it:
(1) one is to pass a pointer-to-pointer parameter, like:
int my_malloc(int size, char **pmem)
{
*pmem=(char *)malloc(size);
if(*pmem==NULL)... (11 Replies)
Suppose to have:
struct Tstudent
{
string name, surname;
int matriculation_num;
};
struct Tnode
{
Tstudent* student;
Tnodo* next;
} L;I want to deference that "student" pointer. For example, I tried with:
*(L->student).matriculation_numbut it not worked, as terminal... (4 Replies)
Hi,
Can any one tell me why my following program is crashing?
#include <iostream>
using namespace std;
class CA {
public:
const static int i;
};
const int CA::i = 10;
int main() {
int* pi = const_cast<int*>(&CA::i);
*pi = 9;
cout << CA::i << endl;
} (6 Replies)
I have what should be a relatively simple program (fadec.c) that maps a struct from an included header file (fadec.h) to a shared memory region, but I’m struggling accessing members in the struct from the pointer returned by shmat. Ultimately, I want to access members in the shared memory structure... (2 Replies)
Hi,
I have received an application that stores some properties in a file. The existing struct looks like this:
struct TData
{
UINT uSizeIncludingStrings;
// copy of Telnet data struct
UINT uSize;
// basic properties:
TCHAR szHost; //defined in Sshconfig
UINT iPortNr;
TCHAR... (2 Replies)
Hi guys ,
i got segment fault , and when i trace , found it happens since the value of pointer which is returned by Struct S_client (*ptr) is zero
if (ptr !=0)i know , adding above line of code is not the solution and not correct for the case since above line only check for the pointer... (1 Reply)
Hi all!
I am trying to register a device in an existing device class, but I am
having trouble getting the pointer to an existing class.
I can create a class in a module, get the pointer to it and then use
it to register the device with:
*cl = class_create(THIS_MODULE, className);... (0 Replies)
Discussion started by: hdaniel@ualg.pt
0 Replies
LEARN ABOUT CENTOS
ibv_create_ah
IBV_CREATE_AH(3) Libibverbs Programmer's Manual IBV_CREATE_AH(3)NAME
ibv_create_ah, ibv_destroy_ah - create or destroy an address handle (AH)
SYNOPSIS
#include <infiniband/verbs.h>
struct ibv_ah *ibv_create_ah(struct ibv_pd *pd,
struct ibv_ah_attr *attr);
int ibv_destroy_ah(struct ibv_ah *ah);
DESCRIPTION
ibv_create_ah() creates an address handle (AH) associated with the protection domain pd. The argument attr is an ibv_ah_attr struct, as
defined in <infiniband/verbs.h>.
struct ibv_ah_attr {
struct ibv_global_route grh; /* Global Routing Header (GRH) attributes */
uint16_t dlid; /* Destination LID */
uint8_t sl; /* Service Level */
uint8_t src_path_bits; /* Source path bits */
uint8_t static_rate; /* Maximum static rate */
uint8_t is_global; /* GRH attributes are valid */
uint8_t port_num; /* Physical port number */
};
struct ibv_global_route {
union ibv_gid dgid; /* Destination GID or MGID */
uint32_t flow_label; /* Flow label */
uint8_t sgid_index; /* Source GID index */
uint8_t hop_limit; /* Hop limit */
uint8_t traffic_class; /* Traffic class */
};
ibv_destroy_ah() destroys the AH ah.
RETURN VALUE
ibv_create_ah() returns a pointer to the created AH, or NULL if the request fails.
ibv_destroy_ah() returns 0 on success, or the value of errno on failure (which indicates the failure reason).
SEE ALSO ibv_alloc_pd(3), ibv_init_ah_from_wc(3), ibv_create_ah_from_wc(3)AUTHORS
Dotan Barak <dotanba@gmail.com>
libibverbs 2006-10-31 IBV_CREATE_AH(3)