| commit | f9c4740f592afb4eb7f1ff5d4b15e3cb74a26680 | |
| author | Alexander Kyte <alkyte@microsoft.com> | |
| Tue, 26 Jun 2018 20:22:25 +0000 (26 16:22 -0400) | ||
| committer | Alexander Kyte <alkyte@microsoft.com> | |
| Fri, 6 Jul 2018 18:42:07 +0000 (6 14:42 -0400) | ||
| tree | 6933d87196906302fce82b66f9d7c4bd35626ff7 | treesnapshot (tar.gz zip) |
| parent | 0146210751a01a413152965551e7bec406375fac | commitdiff |
[runtime] Make quick message-passing system for global flight recorder
The previous system was a nice prototype, but it ran into the problem of
taking a global lock on every thread doing logging. A fully lockless
implementation of a data structure with so much state would have been
madness to debug, and I really didn't want to spend much time in the future
debugging this.
What I did is to make a thread that reads from a lockless queue and logs the
message from the queue.
Most of the rest of this code is to address the fact that hazard
pointers depend on state that is initialized after logging is expected
to come up.
The previous system was a nice prototype, but it ran into the problem of
taking a global lock on every thread doing logging. A fully lockless
implementation of a data structure with so much state would have been
madness to debug, and I really didn't want to spend much time in the future
debugging this.
What I did is to make a thread that reads from a lockless queue and logs the
message from the queue.
Most of the rest of this code is to address the fact that hazard
pointers depend on state that is initialized after logging is expected
to come up.