f770366f6d
It's possible for the scheduler to try to preempt a goroutine running on a thread created by C code just as the goroutine returns from Go code to C code. If that happens, the goroutine will have a nil g, which would normally cause us to enter the badsignal code. The badsignal code will allocate an M, reset the signal handler, and raise the signal. This is all wasted work for SIGURG, as the default behavior is for the kernel to ignore the signal. It also means that there is a period of time when preemption requests are ignored, because the signal handler is reset to the default. And, finally, it triggers a bug on 386 OpenBSD 6.2. So stop doing it. No test because there is no real change in behavior (other than on OpenBSD), the new code is just more efficient Fixes #36996 Change-Id: I8c1cb9bc09f5ef890cab567924417e2423fc71f6 Reviewed-on: https://go-review.googlesource.com/c/go/+/217617 Reviewed-by: Austin Clements <austin@google.com> |
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