I am woking on IPC shared memory where i am loading one vector in memory by
process1 and using the same with another program. but in process2 i am
getting one error whie this code is same as given
http://www.boost.org/doc/libs/1_38_0/doc/html/interprocess/quick_guide.html#....
I am just doing benchmarking. May i know what is the reason behind this?
Process1.
#include
#include
#include
int main ()
{
using namespace boost::interprocess;
try{
//Shared memory front-end that is able to construct objects
//associated with a c-string. Erase previous shared memory with the
name
//to be used and create the memory segment at the specified address
and initialize resources
shared_memory_object::remove("MySharedMemory");
managed_shared_memory segment
(create_only
,"MySharedMemory" //segment name
,65536); //segment size in bytes
//Alias an STL compatible allocator of ints that allocates ints from
the managed
//shared memory segment. This allocator will allow to place
containers
//in managed shared memory segments
typedef allocator
ShmemAllocator;
//Alias a vector that uses the previous STL-like allocator
typedef vector MyVector;
//Initialize shared memory STL-compatible allocator
const ShmemAllocator alloc_inst (segment.get_segment_manager());
//Construct a shared memory
MyVector *myvector =
segment.construct<MyVector>("MyVector") //object name
(alloc_inst);//first ctor parameter
//Insert data in the vector
for(int i = 0; i < 100; ++i){
myvector->push_back(i);
}
}
catch(...){
shared_memory_object::remove("MySharedMemory");
throw;
}
shared_memory_object::remove("MySharedMemory");
return 0;
}
Process2
#include
#include
#include
#include <algorithm>
#include <iostream>
int main ()
{
using namespace boost::interprocess;
try{
//A special shared memory where we can
//construct objects associated with a name.
//Connect to the already created shared memory segment
//and initialize needed resources
managed_shared_memory segment
(open_only
,"MySharedMemory"); //segment name
//Alias an STL compatible allocator of ints that allocates ints from
the managed
//shared memory segment. This allocator will allow to place
containers
//in managed shared memory segments
typedef allocator
ShmemAllocator;
//Alias a vector that uses the previous STL-like allocator
typedef vector MyVector;
//Find the vector using the c-string name
MyVector *myvector = segment.find<MyVector>("MyVector").first;
for (MyVector::iterator it = myvector->begin(); it!=myvector->end();
it++) {
std::cout << *it << "\n";
}
//Use vector in reverse order
std::sort(myvector->rbegin(), myvector->rend());
// . . .
//When done, destroy the vector from the segment
segment.destroy<MyVector>("MyVector");
}
catch(...){
shared_memory_object::remove("MySharedMemory");
throw;
}
shared_memory_object::remove("MySharedMemory");
return 0;
}
Error Message:
terminate called after throwing an instance of
'boost::interprocess::interprocess_exception'
what(): No such file or directory
Aborted
--
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