Print PC of the previous lock, not the current one.
The current one will be printed during unwind.
Reviewed By: melver
Differential Revision: https://reviews.llvm.org/D112533
Compilers tends to insert memset/memcpy for some struct/array operations,
and these don't play well inside of sanitizer runtimes.
Avoiding these calls was the intention behind internal_memset.
Remove the leftover ={} that can result in memset call.
Reviewed By: vitalybuka, pgousseau
Differential Revision: https://reviews.llvm.org/D106978
Copy internal deadlock detector from tsan to sanitizer_common
(with some cosmetic changes).
Tsan version will be deleted in subsequent changes.
This allows us to switch tsan to the sanitizer_common mutex
and remove tsan's mutex.
Reviewed By: vitalybuka, melver
Differential Revision: https://reviews.llvm.org/D106546
Some minor improvements:
1. Make StaticSpinMutex non-copyable.
2. Add LIKELY to Lock.
3. Move LockSlow into the .cpp file (now that we have it).
4. The only non-trivial change: use proc_yield(1) instread of proc_yield(10)
with the proportional increase in the number of spin iterations.
Latency of the PAUSE instruction has raised from ~1 cycle to ~100 cycles
in the recent Intel CPUs. So proc_yield(10) is too aggressive backoff.
Reviewed By: vitalybuka
Differential Revision: https://reviews.llvm.org/D106350
Semaphore is a portable way to park/unpark threads.
The plan is to use it to implement a portable blocking
mutex in subsequent changes. Semaphore can also be used
to efficiently wait for other things (e.g. we currently
spin to synchronize thread creation and start).
Reviewed By: vitalybuka, melver
Differential Revision: https://reviews.llvm.org/D106071
Dmitry Vyukov