runtime/race: detect when program synchronizes with time.Sleep

[dvyukov]

There is a common pattern of "synchronization":

var result ...
go func() {
  ...
  result = ...
}()
time.Sleep(time.Second)  // 1 second should be enough for everyone
if bad(result) {
  complain()
}

C++ ThreadSanitizer prints a useful "As if synchronized via sleep" message
with a stack trace of the sleep:
http://llvm.org/viewvc/llvm-project/compiler-rt/trunk/lib/tsan/lit_tests/sleep_sync.cc?view=markup

It would be useful to do the same for Go.

[rsc]

Comment 1:

Labels changed: added go1.3maybe.

[rsc]

Comment 2:

Labels changed: added release-none, removed go1.3maybe.

[rsc]

Comment 3:

Labels changed: added repo-main.

[dvyukov]

This is a very old proactive improvement request, nobody ever asked for it and there are no active plans to implement this, so closing.