It uses the `simgrid::simix::Process` as an opaque pimple:
-~~~
-class Process {
-private:
- std::atomic_int_fast32_t refcount_ { 1 };
- // The lifetime of the s4u::Actor is bound to the lifetime of the Process:
- simgrid::s4u::Actor actor_;
-public:
- Process() : actor_(this) {}
-
- // Reference count:
- friend void intrusive_ptr_add_ref(Process* process)
- {
- // Atomic operation! Do not split in two instructions!
- auto previous = (process->refcount_)++;
- xbt_assert(previous != 0);
- (void) previous;
- }
- friend void intrusive_ptr_release(Process* process)
- {
- // Atomic operation! Do not split in two instructions!
- auto count = --(process->refcount_);
- if (count == 0)
- delete process;
- }
-
- // [...]
-};
-
-smx_process_t SIMIX_process_ref(smx_process_t process)
-{
- if (process != nullptr)
- intrusive_ptr_add_ref(process);
- return process;
-}
-
-/** Decrease the refcount for this process */
-void SIMIX_process_unref(smx_process_t process)
-{
- if (process != nullptr)
- intrusive_ptr_release(process);
-}
-~~~
@section simgrid_uhood_mc Model Checker
