diff options
Diffstat (limited to 'libgo/runtime/cpuprof.c')
| -rw-r--r-- | libgo/runtime/cpuprof.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/libgo/runtime/cpuprof.c b/libgo/runtime/cpuprof.c index 252948d..9bf5d11 100644 --- a/libgo/runtime/cpuprof.c +++ b/libgo/runtime/cpuprof.c @@ -105,6 +105,7 @@ struct Profile { uint32 wtoggle; bool wholding; // holding & need to release a log half bool flushing; // flushing hash table - profile is over + bool eod_sent; // special end-of-data record sent; => flushing }; static Lock lk; @@ -115,6 +116,8 @@ static void add(Profile*, uintptr*, int32); static bool evict(Profile*, Entry*); static bool flushlog(Profile*); +static uintptr eod[3] = {0, 1, 0}; + // LostProfileData is a no-op function used in profiles // to mark the number of profiling stack traces that were // discarded due to slow data writers. @@ -168,6 +171,7 @@ runtime_SetCPUProfileRate(int32 hz) prof->wholding = false; prof->wtoggle = 0; prof->flushing = false; + prof->eod_sent = false; runtime_noteclear(&prof->wait); runtime_setcpuprofilerate(tick, hz); @@ -414,6 +418,16 @@ breakflush: } // Made it through the table without finding anything to log. + if(!p->eod_sent) { + // We may not have space to append this to the partial log buf, + // so we always return a new slice for the end-of-data marker. + p->eod_sent = true; + ret.array = (byte*)eod; + ret.len = sizeof eod; + ret.cap = ret.len; + return ret; + } + // Finally done. Clean up and return nil. p->flushing = false; if(!runtime_cas(&p->handoff, p->handoff, 0)) |