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runtime: free Windows event handles after last lock is dropped
Calls to lock may need to use global members of mOS that also need to be cleaned up before the thread exits. Before this commit, these resources would leak. Moving them to be cleaned up in unminit, however, would race with gstack on unix. So this creates a new helper, mdestroy, to release resources that must be destroyed only after locks are no longer required. We also move highResTimer lifetime to the same semantics, since it doesn't help to constantly acquire and release the timer object during dropm. Updates #43720. Change-Id: Ib3f598f3fda1b2bbcb608099616fa4f85bc1c289 Reviewed-on: https://go-review.googlesource.com/c/go/+/284137 Run-TryBot: Jason A. Donenfeld <Jason@zx2c4.com> TryBot-Result: Go Bot <gobot@golang.org> Reviewed-by: Ian Lance Taylor <iant@golang.org> Reviewed-by: Austin Clements <austin@google.com> Trust: Alex Brainman <alex.brainman@gmail.com> Trust: Jason A. Donenfeld <Jason@zx2c4.com>
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