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10 Commits

Author SHA1 Message Date
Dmitry Vyukov b5eb8f0212 tsan: fix vector clocks 
the new optimizations break when thread ids gets reused (clocks go backwards)
add the necessary tests as well

llvm-svn: 206035
 2014-04-11 15:38:03 +00:00
Dmitry Vyukov d23118c3b2 tsan: optimize vector clock operations 
Make vector clock operations O(1) for several important classes of use cases.
See comments for details.
Below are stats from a large server app, 77% of all clock operations are handled as O(1).

Clock acquire                     :         25983645
  empty clock                     :          6288080
  fast from release-store         :         14917504
  contains my tid                 :          4515743
  repeated (fast)                 :          2141428
  full (slow)                     :          2636633
  acquired something              :          1426863
Clock release                     :          2544216
  resize                          :             6241
  fast1                           :           197693
  fast2                           :          1016293
  fast3                           :             2007
  full (slow)                     :          1797488
  was acquired                    :           709227
  clear tail                      :                1
  last overflow                   :                0
Clock release store               :          3446946
  resize                          :           200516
  fast                            :           469265
  slow                            :          2977681
  clear tail                      :                0
Clock acquire-release             :           820028

llvm-svn: 204656
 2014-03-24 18:54:20 +00:00
Dmitry Vyukov e11f2920c9 tsan: more precise handling of finalizers 
llvm-svn: 167530
 2012-11-07 15:08:20 +00:00
Dmitry Vyukov ba827dfdae tsan: don't release disabled clocks 
llvm-svn: 167451
 2012-11-06 13:16:25 +00:00
Dmitry Vyukov 904d3f9c06 tsan: add ReleaseStore() function that merely copies vector clock rather than combines two clocks 
fix clock setup for finalizer goroutine (Go runtime)

llvm-svn: 160918
 2012-07-28 15:27:41 +00:00
Dmitry Vyukov dfc8e52400 tsan: suport for Go finalizers 
llvm-svn: 160723
 2012-07-25 13:16:35 +00:00
Dmitry Vyukov 302cebb8f1 tsan: add shadow memory flush + fix few bugs 
llvm-svn: 157270
 2012-05-22 18:07:45 +00:00
Dmitry Vyukov fee5b7d2e0 tsan: detect accesses to freed memory 
http://codereview.appspot.com/6214052

llvm-svn: 156990
 2012-05-17 14:17:51 +00:00
Kostya Serebryany 07c4805175 [tsan] run more kinds of builds as presubmit test (and fix gcc debug build) 
llvm-svn: 156616
 2012-05-11 14:42:24 +00:00
Kostya Serebryany 4ad375f0a9 [tsan] First commit of ThreadSanitizer (TSan) run-time library. 
Algorithm description: http://code.google.com/p/thread-sanitizer/wiki/ThreadSanitizerAlgorithm

Status:
The tool is known to work on large real-life applications, but still has quite a few rough edges.
Nothing is guaranteed yet.

The tool works on x86_64 Linux.
Support for 64-bit MacOS 10.7+ is planned for late 2012.
Support for 32-bit OSes is doable, but problematic and not yet planed.

Further commits coming:
  - tests
  - makefiles
  - documentation
  - clang driver patch

The code was previously developed at http://code.google.com/p/data-race-test/source/browse/trunk/v2/
by Dmitry Vyukov and Kostya Serebryany with contributions from
Timur Iskhodzhanov, Alexander Potapenko, Alexey Samsonov and Evgeniy Stepanov.

llvm-svn: 156542
 2012-05-10 13:48:04 +00:00