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Document mechanism used in the functor constructor

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Alexander Grund 2022-02-10 11:42:33 +01:00
parent 9e2223d4be
commit 68700d4c3a
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1 changed files with 13 additions and 4 deletions
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17
include/turtle/detail/functor.hpp
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@ -27,16 +27,25 @@ namespace mock { namespace detail {
functor()
{
scoped_lock _(functor_mutex);
static functor* f = 0;
// MOCK_FUNCTOR creates 2 functor objects:
// The user-usable one with the passed name and a 2nd used by MOCK_EXPECT with a suffixed name
// We need the 2nd to be a copy of the first and use a static variable for storing a pointer to the first
static functor* f = nullptr;
if(f)
{
*this = *f;
f = 0;
// Release the lock from the first call (see below) so other threads can create functors again
// after the function exits (the scoped_lock still holds the mutex)
functor_mutex.unlock();
// Copy the first functor to the current (2nd) one
*this = *f;
f = nullptr;
} else
{
functor_mutex.lock();
// This is the first object, store its pointer
f = this;
// Lock the mutex again so only this thread can create new instances of a functor
// making sure that we copy the right instance above and not one from a concurrent thread
functor_mutex.lock();
}
}
};