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8 Commits

Author SHA1 Message Date
Marshall Clow 3126c88137 Qualify calls to addressof to avoid getting ADL. Fixes PR#27254. 
llvm-svn: 266209
 2016-04-13 17:02:23 +00:00
Marshall Clow 0b54e792b7 Implement LWG2577: {shared,unique}_lock</tt> should use std::addressof 
llvm-svn: 263506
 2016-03-14 23:07:32 +00:00
Marshall Clow f69ae47128 Implement N4508: shared_mutex. Reviewed as http://reviews.llvm.org/D10480 
llvm-svn: 241067
 2015-06-30 14:04:14 +00:00
Eric Fiselier 4453d2185c [libcxx] Fix bug in shared_timed_mutex that could cause a program to hang. 
Summary:
The summary of the bug, provided by Stephan T. Lavavej:

In shared_timed_mutex::try_lock_until() (line 195 in 3.6.0), you need to deliver a notification.  The scenario is:
 
* There are N threads holding the shared lock.
* One thread calls try_lock_until() to attempt to acquire the exclusive lock.  It sets the "I want to write" bool/bit, then waits for the N readers to drain away.
* K more threads attempt to acquire the shared lock, but they notice that someone said "I want to write", so they block on a condition_variable.
* At least one of the N readers is stubborn and doesn't release the shared lock.
* The wannabe-writer times out, gives up, and unsets the "I want to write" bool/bit.
 
At this point, a notification (it needs to be notify_all) must be delivered to the condition_variable that the K wannabe-readers are waiting on.  Otherwise, they can block forever without waking up.



Reviewers: mclow.lists, jyasskin

Reviewed By: jyasskin

Subscribers: jyasskin, cfe-commits

Differential Revision: http://reviews.llvm.org/D8796

llvm-svn: 233944
 2015-04-02 21:02:06 +00:00
Jonathan Roelofs b3fcc67f8f Allow libc++ to be built on systems without POSIX threads 
If you're crazy enough to want this sort of thing, then add
-D_LIBCPP_HAS_NO_THREADS to your CXXFLAGS and
--param=additiona_features=libcpp-has-no-threads to your lit commnad line.

http://reviews.llvm.org/D3969

llvm-svn: 217271
 2014-09-05 19:45:05 +00:00
Marshall Clow d08f0d9c05 Replace 'noexcept' with '_NOEXCEPT' in <shared_mutex>. This allows us to build the dylib with MSVC, which doesn't support noexcept (sheesh\!). Thanks to K-ballo for the report. 
llvm-svn: 216384
 2014-08-25 14:53:16 +00:00
David Majnemer 7ec93f9b1c Implement N3891: A proposal to rename shared_mutex to shared_timed_mutex 
This is as straightforward as it sounds, a renamed from shared_mutex to
shared_timed_mutex.

Note that libcxx .dylib and .so files built with c++14 support need to
be rebuilt.

llvm-svn: 204078
 2014-03-17 20:19:44 +00:00
Howard Hinnant ead6f1699d N3659: Shared locking in C++ Revision 2, c++1y only 
llvm-svn: 191127
 2013-09-21 01:49:28 +00:00