r263224 - in /trunk/libstdc++-v3: ChangeLog inc...

[redi@gcc.gnu.org]

Author: redi
Date: Wed Aug  1 15:39:45 2018
New Revision: 263224

URL: https://gcc.gnu.org/viewcvs?rev=263224&root=gcc&view=rev
Log:
Report early wakeup of condition_variable::wait_until as no_timeout

As currently implemented, condition_variable always ultimately waits
against std::chrono::system_clock. This clock can be changed in arbitrary
ways by the user which may result in us waking up too early or too late
when measured against the caller-supplied clock.

We can't (yet) do much about waking up too late (PR 41861), but
if we wake up too early we must return cv_status::no_timeout to indicate a
spurious wakeup rather than incorrectly returning cv_status::timeout.

2018-08-01  Mike Crowe  <mac@mcrowe.com>

	* include/std/condition_variable (wait_until): Only report timeout
	if we really have timed out when measured against the
	caller-supplied clock.
	* testsuite/30_threads/condition_variable/members/2.cc: Add test
	case to confirm above behaviour.

Modified:
    trunk/libstdc++-v3/ChangeLog
    trunk/libstdc++-v3/include/std/condition_variable
    trunk/libstdc++-v3/testsuite/30_threads/condition_variable/members/2.cc