diff options
| author | Rick Hudson <rlh@golang.org> | 2014-09-03 12:06:36 -0400 |
|---|---|---|
| committer | Rick Hudson <rlh@golang.org> | 2014-09-03 12:06:36 -0400 |
| commit | 56bd176e1d5f0145936128c0dc1f931cc5a84c0b (patch) | |
| tree | 19819821b463bc0b875143c633cdbdbe80f1f099 /src/pkg/runtime/runtime.h | |
| parent | f44073785a99c2b6656156fe42055f81d29f5e1a (diff) | |
| download | go-56bd176e1d5f0145936128c0dc1f931cc5a84c0b.tar.xz | |
runtime: Start and stop individual goroutines at gc safepoints
Code to bring goroutines to a gc safepoint one at a time,
do some work such as scanning, and restart the
goroutine, and then move on to the next goroutine.
Currently this code does not do much useful work
but this infrastructure will be critical to future
concurrent GC work.
Fixed comments reviewers.
LGTM=rsc
R=golang-codereviews, rsc, dvyukov
CC=golang-codereviews
https://golang.org/cl/131580043
Diffstat (limited to 'src/pkg/runtime/runtime.h')
| -rw-r--r-- | src/pkg/runtime/runtime.h | 19 |
1 files changed, 17 insertions, 2 deletions
diff --git a/src/pkg/runtime/runtime.h b/src/pkg/runtime/runtime.h index 0d25ca6c51..84a373cd51 100644 --- a/src/pkg/runtime/runtime.h +++ b/src/pkg/runtime/runtime.h @@ -292,7 +292,7 @@ struct G bool preempt; // preemption signal, duplicates stackguard0 = StackPreempt bool paniconfault; // panic (instead of crash) on unexpected fault address bool preemptscan; // preempted g does scan for GC - bool scancheck; // debug: cleared at begining of scan cycle, set by scan, tested at end of cycle + bool gcworkdone; // debug: cleared at begining of gc work phase cycle, set by gcphasework, tested at end of cycle int8 raceignore; // ignore race detection events M* m; // for debuggers, but offset not hard-coded M* lockedm; @@ -579,6 +579,16 @@ struct DebugVars int32 scavenge; }; +// Indicates to write barrier and sychronization task to preform. +enum +{ // Synchronization Write barrier + GCoff, // stop and start nop + GCquiesce, // stop and start nop + GCstw, // stop the ps nop + GCmark, // scan the stacks and start no white to black + GCsweep, // stop and start nop +}; + struct ForceGCState { Mutex lock; @@ -586,6 +596,7 @@ struct ForceGCState uint32 idle; }; +extern uint32 runtime·gcphase; extern bool runtime·precisestack; extern bool runtime·copystack; @@ -614,8 +625,12 @@ enum { HashRandomBytes = 32 }; -uint32 runtime·readgstatus(G *gp); +uint32 runtime·readgstatus(G*); void runtime·casgstatus(G*, uint32, uint32); +void runtime·quiesce(G*); +bool runtime·stopg(G*); +void runtime·restartg(G*); +void runtime·gcphasework(G*); /* * deferred subroutine calls |