Commit Graph

5 Commits

Author SHA1 Message Date
Evgeniy Stepanov 790838110f Revert r304285, r304297.
r304285 - [sanitizer] Avoid possible deadlock in child process after fork
r304297 - [sanitizer] Trying to fix MAC buildbots after r304285

These changes create deadlock when Tcl calls pthread_create from a
pthread_atfork child handler. More info in the original review at
https://reviews.llvm.org/D33325

llvm-svn: 304735
2017-06-05 21:20:55 +00:00
Maxim Ostapenko 62a0f55930 [sanitizer] Avoid possible deadlock in child process after fork
This patch addresses https://github.com/google/sanitizers/issues/774. When we
fork a multi-threaded process it's possible to deadlock if some thread acquired
StackDepot or allocator internal lock just before fork. In this case the lock
will never be released in child process causing deadlock on following memory alloc/dealloc
routine. While calling alloc/dealloc routines after multi-threaded fork is not allowed,
most of modern allocators (Glibc, tcmalloc, jemalloc) are actually fork safe. Let's do the same
for sanitizers except TSan that has complex locking rules.

Differential Revision: https://reviews.llvm.org/D33325

llvm-svn: 304285
2017-05-31 07:28:09 +00:00
Alexey Samsonov a49cfd8f94 Revert "Apply modernize-use-default to compiler-rt."
This reverts commit r250823.

Replacing at least some of empty
constructors with "= default" variants is a semantical change which we
don't want. E.g. __tsan::ClockBlock contains a union of large arrays,
and it's critical for correctness and performance that we don't memset()
these arrays in the constructor.

llvm-svn: 251717
2015-10-30 18:52:31 +00:00
Angel Garcia Gomez ea61047c6f Apply modernize-use-default to compiler-rt.
Summary: Replace empty bodies of default constructors and destructors with '= default'.

Reviewers: klimek, bkramer

Subscribers: alexfh, cfe-commits

Differential Revision: http://reviews.llvm.org/D13892

llvm-svn: 250823
2015-10-20 12:53:50 +00:00
Evgeniy Stepanov f653cda269 [msan] Introduce MsanThread. Move thread-local allocator cache out of TLS.
This reduces .tbss from 109K down to almost nothing.

llvm-svn: 205618
2014-04-04 09:47:41 +00:00