Mocking pthread_create using gmock

Question

I have a method that calls pthread_create(...). is it possible to mock and expect the output of pthread_create so I don't actually launch a thread?

I am asking this because the entire class is a Mock Object and as soon as I delete the object at the end of the test case the thread segments.

Answer 1

Yes. Declare mock class and functions:

struct phtread_interface
{
    virtual int pthread_create(...) = 0;
    ... // other methods
};

class pthread_mock : public phtread_interface
{
public:
    MOCK_METHOD1(pthread_create, int(...));
    ....
};

pthread_interface *current_pthread_mock;

void set_current_pthread_mock(phtread_interface *mock)
{
    current_pthread_mock = mock;
}

int pthread_create(...)
{
    return current_pthread_mock->pthread_create(...);
}

In every test function do following:

pthread_mock mock_obj;
set_current_pthread_mock(&mock_obj);

// set expectations over mock_obj, use pthread_create ...    

In source file with pthread_create add conditional include like:

#ifndef TESTING
#include <pthread.h>
#else
#include "pthread_mock.h"
#endif