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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testdata	all: use more precise build tags	2021-02-23 19:55:03 +00:00
backdoor.go
buildid_linux.go
callback_c_gc.c
callback_c_gccgo.c
callback_c.c
callback.go	runtime: unify asmcgocall and systemstack traceback setup	2021-02-19 00:02:06 +00:00
cgo_linux_test.go	syscall: support POSIX semantics for Linux syscalls	2020-10-23 20:53:14 +00:00
cgo_stubs_android_test.go	misc/cgo/test: consolidate tests into fewer cgo source files	2019-05-22 12:52:33 +00:00
cgo_test.go	runtime/cgo: add Handle for managing (c)go pointers	2021-04-06 23:39:42 +00:00
cgo_thread_lock.go
cgo_unix_test.go
cthread_unix.c	cmd/dist, misc/cgo: enable tests for aix/ppc64	2019-03-20 14:38:44 +00:00
cthread_windows.c
issue1435.go	all: update references to symbols moved from io/ioutil to io	2021-04-05 17:51:15 +00:00
issue4029.c	cmd/link: support cgo internal/linking on darwin/arm64	2020-10-20 02:25:52 +00:00
issue4029.go	cmd/link: support cgo internal/linking on darwin/arm64	2020-10-20 02:25:52 +00:00
issue4029w.go	cmd/link: support cgo internal/linking on darwin/arm64	2020-10-20 02:25:52 +00:00
issue4273.c
issue4273b.c
issue4339.c
issue4339.h
issue5548_c.c
issue5740a.c
issue5740b.c
issue6833_c.c
issue6907export_c.c
issue6997_linux.c
issue6997_linux.go
issue7234_test.go
issue8148.go
issue8331.h
issue8517_windows.c
issue8517_windows.go
issue8517.go
issue8694.go
issue8811.c
issue18146.go	all: add GOOS=ios	2020-09-23 18:12:59 +00:00
issue20910.c
issue21897.go	misc/cgo/test: re-enable darwin cgo tests in race mode	2020-01-10 10:04:49 +00:00
issue21897b.go	misc/cgo/test: re-enable darwin cgo tests in race mode	2020-01-10 10:04:49 +00:00
issue31891.c	cmd/cgo: build unique C type cache keys from parent names	2019-10-05 00:16:04 +00:00
issue42495.go	cmd/cgo: fix initialization of empty argument types	2020-11-13 15:15:15 +00:00
overlaydir_test.go	misc: remove use of relative directories in overlayDir functions	2019-11-25 16:26:15 +00:00
pkg_test.go	all: update references to symbols moved from io/ioutil to io	2021-04-05 17:51:15 +00:00
setgid_linux.go
sigaltstack.go	runtime: use sigaltstack on macOS/ARM64	2020-10-06 21:25:42 +00:00
sigprocmask.c	misc/cgo/test: add retry loop around pthread_create in TestSigprocmask	2018-06-27 04:33:10 +00:00
sigprocmask.go
test_unix.go	misc/cgo/test: consolidate tests into fewer cgo source files	2019-05-22 12:52:33 +00:00
test_windows.go	misc/cgo/test: consolidate tests into fewer cgo source files	2019-05-22 12:52:33 +00:00
test.go	runtime/cgo: add Handle for managing (c)go pointers	2021-04-06 23:39:42 +00:00
testx.go	runtime/cgo: add Handle for managing (c)go pointers	2021-04-06 23:39:42 +00:00