runtime: use debugSelect flag to toggle debug code

This block of code once was commented by the original author, but commenting
code looks a little annoying. However, the debugSelect flag is just for the
situation that debug code will be compiled when debuging, when release this
code will be eliminated by the compiler.

Change-Id: I7b94297e368b515116ef44a36058214ddddf9adb
Reviewed-on: https://go-review.googlesource.com/113395
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

diff --git a/src/runtime/select.go b/src/runtime/select.go
index fccb53b44c9428bd2d859c1fbe1fc4c6f0f5d526..3a3ac6b7ac0bd5f08864621b0a3f8238f8e6613c 100644 (file)
--- a/src/runtime/select.go
+++ b/src/runtime/select.go
@@ -191,14 +191,15 @@ func selectgo(cas0 *scase, order0 *uint16, ncases int) (int, bool) {
                }
                lockorder[j] = o
        }
-       /*
+
+       if debugSelect {
                for i := 0; i+1 < ncases; i++ {
                        if scases[lockorder[i]].c.sortkey() > scases[lockorder[i+1]].c.sortkey() {
                                print("i=", i, " x=", lockorder[i], " y=", lockorder[i+1], "\n")
                                throw("select: broken sort")
                        }
                }
-       */
+       }
 
        // lock all the channels involved in the select
        sellock(scases, lockorder)