Changkun Ou 972e883925 runtime/cgo: add Handle for managing (c)go pointers ... A non-trivial Cgo program may need to use callbacks and interact with go objects per goroutine. Because of the rules for passing pointers between Go and C, such a program needs to store handles to associated Go values. This often causes much extra effort to figure out a way to correctly deal with: 1) map collision; 2) identifying leaks and 3) concurrency. This CL implements a Handle representation in runtime/cgo package, and related methods such as Value, Delete, etc. which allows Go users can use a standard way to handle the above difficulties. In addition, the CL allows a Go value to have multiple handles, and the NewHandle always returns a different handle compare to the previously returned handles. In comparison, CL 294670 implements a different behavior of NewHandle that returns a unique handle when the Go value is referring to the same object. Benchmark: name time/op Handle/non-concurrent-16 487ns ± 1% Handle/concurrent-16 674ns ± 1% Fixes #37033 Change-Id: I0eadb9d44332fffef8fb567c745246a49dd6d4c1 Reviewed-on: https://go-review.googlesource.com/c/go/+/295369 Run-TryBot: Ian Lance Taylor <iant@golang.org> TryBot-Result: Go Bot <gobot@golang.org> Reviewed-by: Ian Lance Taylor <iant@golang.org> Trust: Cherry Zhang <cherryyz@google.com>		2021-04-06 23:39:42 +00:00
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asm.html	doc/asm: add a section on go_asm.h, clean up go_tls.h section	2021-01-25 19:32:27 +00:00
go1.17.html	runtime/cgo: add Handle for managing (c)go pointers	2021-04-06 23:39:42 +00:00
go_mem.html	doc/mem: remove unnecessary pre tags within same snippet	2020-03-03 09:28:34 +00:00
go_spec.html	spec: fix rendering of >=	2021-03-17 00:18:28 +00:00