Question

I have a producer/consumer concurrency problem that I’m working on. The problem is that I’m getting a segfault thrown immediately after trying to create my first thread.

Relevant code:

customer is a struct declared as:

struct pr2_customer
{
    pthread_t customer_id;
};
typedef struct pr2_customer customer;

customers is a c++ vector, declared like:

vector<customer> customers;

Create the thread:

for(int i = 0; i < ncustomers; i++)
{
    cout<<"creating a customer\n";
    pthread_create(&customers[i].customer_id, &attr, customerAction, (void*)i);
}

Output:

creating a customer
segfault

customerAction has a cout statement as it’s first line which never gets executed, leading me to believe the thread is never created.

Any help is greatly appreciated.

Answer 1

What appears to me is that you haven’t reserved any space in customers. I think this is what you need:

vector<customer> customers(ncustomers);