Dear sir or madam,   I’m currently working on a project with mpich. I faced some difficulties when I would like to count the mutex waiting time, just like what they did on the paper, Fine-Grained Multithreading Support for Hybrid Threaded MPI Programming. I could not find the definition of the function, MPID_THREAD_CS_ENTER(GLOBAL, MPIR_THREAD_GLOBAL_ALLFUNC_MUTEX). If you could provide me more detailed information, I will appreciate it. Thank you in advance! Sincerely, Yongyu Chen