diff options
Diffstat (limited to 'src/runtime/profbuf.go')
| -rw-r--r-- | src/runtime/profbuf.go | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/src/runtime/profbuf.go b/src/runtime/profbuf.go index 605d8d34a4..2719238bc1 100644 --- a/src/runtime/profbuf.go +++ b/src/runtime/profbuf.go @@ -544,5 +544,18 @@ Read: // Remember how much we returned, to commit read on next call. b.rNext = br.addCountsAndClearFlags(skip+di, ti) + if raceenabled { + // Match racewritepc in runtime_setProfLabel, + // so that the setting of the labels in runtime_setProfLabel + // is treated as happening before any use of the labels + // by our caller. The synchronization on labelSync itself is a fiction + // for the race detector. The actual synchronization is handled + // by the fact that the signal handler only reads from the current + // goroutine and uses atomics to write the updated queue indices, + // and then the read-out from the signal handler buffer uses + // atomics to read those queue indices. + raceacquire(unsafe.Pointer(&labelSync)) + } + return data[:di], tags[:ti], false } |