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| author | Ian Lance Taylor <ian@gcc.gnu.org> | 2019-09-12 23:22:53 +0000 |
|---|---|---|
| committer | Ian Lance Taylor <ian@gcc.gnu.org> | 2019-09-12 23:22:53 +0000 |
| commit | 656297e1fec9a127ff742df16958ee279ccacec5 (patch) | |
| tree | 24347a35dacea36ce742c32c17420f3e31f17e3d /libgo/go/runtime/export_test.go | |
| parent | d6ecb707cc5a58816d27908a7aa324c4b0bc67bb (diff) | |
| download | gcc-656297e1fec9a127ff742df16958ee279ccacec5.zip gcc-656297e1fec9a127ff742df16958ee279ccacec5.tar.gz gcc-656297e1fec9a127ff742df16958ee279ccacec5.tar.bz2 | |
libgo: update to Go1.13
Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/194698
From-SVN: r275691
Diffstat (limited to 'libgo/go/runtime/export_test.go')
| -rw-r--r-- | libgo/go/runtime/export_test.go | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/libgo/go/runtime/export_test.go b/libgo/go/runtime/export_test.go index 0db2393..10890d3 100644 --- a/libgo/go/runtime/export_test.go +++ b/libgo/go/runtime/export_test.go @@ -675,3 +675,37 @@ func (t *Treap) CheckInvariants() { t.mTreap.treap.walkTreap(checkTreapNode) t.mTreap.treap.validateInvariants() } + +func RunGetgThreadSwitchTest() { + // Test that getg works correctly with thread switch. + // With gccgo, if we generate getg inlined, the backend + // may cache the address of the TLS variable, which + // will become invalid after a thread switch. This test + // checks that the bad caching doesn't happen. + + ch := make(chan int) + go func(ch chan int) { + ch <- 5 + LockOSThread() + }(ch) + + g1 := getg() + + // Block on a receive. This is likely to get us a thread + // switch. If we yield to the sender goroutine, it will + // lock the thread, forcing us to resume on a different + // thread. + <-ch + + g2 := getg() + if g1 != g2 { + panic("g1 != g2") + } + + // Also test getg after some control flow, as the + // backend is sensitive to control flow. + g3 := getg() + if g1 != g3 { + panic("g1 != g3") + } +} |