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runtime: document sudog

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Change-Id: I85c0bcf02842cc32dbc9bfdcea27efe871173574
Reviewed-on: https://go-review.googlesource.com/20774
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
This commit is contained in:
Austin Clements 2016-03-17 14:08:32 -04:00
parent ac74e5debc
commit 857d0b48db
1 changed files with 10 additions and 0 deletions
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10
src/runtime/runtime2.go
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@ -210,6 +210,16 @@ type gobuf struct {
bp uintptr // for GOEXPERIMENT=framepointer
}
// sudog represents a g in a wait list, such as for sending/receiving
// on a channel.
//
// sudog is necessary because the g ↔ synchronization object relation
// is many-to-many. A g can be on many wait lists, so there may be
// many sudogs for one g; and many gs may be waiting on the same
// synchronization object, so there may be many sudogs for one object.
//
// sudogs are allocated from a special pool. Use acquireSudog and
// releaseSudog to allocate and free them.
type sudog struct {
// The following fields are protected by the hchan.lock of the
// channel this sudog is blocking on. shrinkstack depends on