NOTE This is a seriously work-in-progress kind of thing. I regularly rebase the commit history. Please be aware of this if you fork. I'll cut that out once this is miminally usable.
Inspired by criterion and coz.
'andweorc' an Old English for 'cause': Wiktionary.
Coz profiler promises to determine the slow spots in unmofied program, assuming some conditions are met. In practice the most interesting runs with coz are done over modified programs. Criterion runs as a sub-program in a project and does careful timing a benchmarking function. Coz needs to fork to do its LD_PRELOAD trick, criterion does not. Coz overrides the following functions:
exit_exit_Exitforksigactionsignalkillsigprocmasksigwaitsigwaitinfosigtimedwaitpthread_createpthread_exitpthread_joinpthread_tryjoin_nppthread_timedjoin_nppthread_sigmaskpthread_killpthread_sigqueuepthread_mutex_lockpthread_mutex_trylockpthread_mutex_unlockpthread_cond_waitpthread_cond_timedwaitpthread_cond_signalpthread_cond_broadcastpthread_barrier_waitpthread_rwlock_rdlockpthread_rwlock_tryrdlockpthread_rwlock_timedrdlockpthread_rwlock_wrlockpthread_rwlock_trywrlockpthread_rwlock_timedwrlockpthread_rwlock_unlock
https://users.rust-lang.org/t/override-c-standard-functions-with-ld-preload-without-using-crates/40893/2 https://stackoverflow.com/questions/426230/what-is-the-ld-preload-trick https://stackoverflow.com/questions/48270676/mac-assembly-segfault-with-libc-exit https://stackoverflow.com/questions/65099252/how-to-use-dlsym-in-rust?noredirect=1&lq=1 https://internals.rust-lang.org/t/ld-preload-to-intercept-readlink-of-rustc-compiler-hangs/13000
NOTE:
To make this simpler we DO NOT support forking.