logd: reader/writer element locks
Switch to a reader writer lock for the Element List lock. Also setup
for a reader writer lock for the Times list, but continue to use a
mutex where rdlock() and wrlock() are the same implementation for now.
This should improve general reader performance and prevent blocking of
other reader operations or exit by a single hung logd.reader.per
thread. For example, a full length logcat of an empty buffer (eg:
crash log buffer) will hold a lock while the iterator scans the entire
list.
Test: gTest liblog-unit-tests, logd-unit-tests, logcat-unit-tests
Bug: 37378309
Bug: 37483775
Change-Id: If5723ff4a978e17d828a75321e8f0ba91d4a09e0
diff --git a/logd/LogKlog.cpp b/logd/LogKlog.cpp
index d23254d..a7e7208 100644
--- a/logd/LogKlog.cpp
+++ b/logd/LogKlog.cpp
@@ -579,7 +579,7 @@
const pid_t tid = pid;
uid_t uid = AID_ROOT;
if (pid) {
- logbuf->lock();
+ logbuf->wrlock();
uid = logbuf->pidToUid(pid);
logbuf->unlock();
}