| commit | 9b5bd30716914a86619c050f0d75c0da4133b257 | [log] [tgz] |
|---|---|---|
| author | Austin Clements <austin@google.com> | Mon Jan 06 11:10:26 2020 -0500 |
| committer | Austin Clements <austin@google.com> | Wed Jan 22 18:54:48 2020 +0000 |
| tree | e9429c94f4fecb759da0aed31daefa140fb361ed | |
| parent | 895b7c85addfffe19b66d8ca71c31799d6e55990 [diff] |
runtime: document special memmove requirements Unlike C's memmove, Go's memmove must be careful to do indivisible writes of pointer values because it may be racing with the garbage collector reading the heap. We've had various bugs related to this over the years (#36101, #13160, #12552). Indeed, memmove is a great target for optimization and it's easy to forget the special requirements of Go's memmove. The CL documents these (currently unwritten!) requirements. We're also adding a test that should hopefully keep everyone honest going forward, though it's hard to be sure we're hitting all cases of memmove. Change-Id: I2f59f8d8d6fb42d2f10006b55d605b5efd8ddc24 Reviewed-on: https://go-review.googlesource.com/c/go/+/213418 Reviewed-by: Cherry Zhang <cherryyz@google.com>
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