Cond is difficult to use correctly (I was just bitten by it in
a production app that I inherited). While several proposals have come
up to improve or remove sync.Cond, no action has so far been taken.
Update the documentation to discourage use of sync.Cond, and point
people in the direction of preferred alternatives. I believe this will
help encourage behavior we want (less use of sync.Cond and more use of
channels), while also paving the way for, potentially, removing Cond
in a future version of the language.
Thanks very much to Bryan Mills and Sean Liao for discussion and
recommendations.
Updates #20491.
Updates #21165.
Change-Id: Ib4d0631c79d4c4d0a30027255cd43bc47cddebd3
Reviewed-on: https://go-review.googlesource.com/c/go/+/412237
Run-TryBot: Ian Lance Taylor <iant@google.com>
Auto-Submit: Ian Lance Taylor <iant@google.com>
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Reviewed-by: Ian Lance Taylor <iant@google.com>
The tester goroutine doesn't always gets a chance to run before the
timeout expires. Wait for the goroutine to start and set deadlines
before staring the timer.
Fixes#36796
Change-Id: Iffed6259de31340c3f66e34da473826a1d09fcde
Reviewed-on: https://go-review.googlesource.com/c/go/+/412858
Reviewed-by: Damien Neil <dneil@google.com>
Run-TryBot: Bryan Mills <bcmills@google.com>
Reviewed-by: Bryan Mills <bcmills@google.com>
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This field is only used for a sanity check in a test.
Change-Id: I868ed10131ec33994ebb1b1d88f6740956824bd7
Reviewed-on: https://go-review.googlesource.com/c/go/+/409834
Run-TryBot: Robert Findley <rfindley@google.com>
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This suppresses verbose output if the test passes,
eliminating some "hello from C" noise for the ../misc/cgo test.
Change-Id: I6324bfb4b3633c20e0eb0ae03aa25d40fab9fcfb
Reviewed-on: https://go-review.googlesource.com/c/go/+/412776
Reviewed-by: Ian Lance Taylor <iant@google.com>
Run-TryBot: Bryan Mills <bcmills@google.com>
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This test originally existed as two tests in test/locklinear.go, but
this checked against actual locks and was flaky. The test was checking
a property of a deep part of the runtime but from a much higher level,
and it's easy for nondeterminism due to scheduling to completely mess
that up, especially on an oversubscribed system.
That test was then moved to the sync package with a more rigorous
testing methodology, but it could still flake pretty easily.
Finally, this CL makes semtable more testable, exports it in
export_test.go, then writes a very direct scalability test for exactly
the situation the original test described. As far as I can tell, this is
much, much more stable, because it's single-threaded and is just
checking exactly the algorithm we need to check.
Don't bother trying to bring in a test that checks for O(log n) behavior
on the other kind of iteration. It'll be perpetually flaky because the
underlying data structure is a treap, so it's only _expected_ to be
O(log n), but it's very easy for it to get unlucky without a large
number of iterations that's too much for a simple test.
Fixes#53381.
Change-Id: Ia1cd2d2b0e36d552d5a8ae137077260a16016602
Reviewed-on: https://go-review.googlesource.com/c/go/+/412875
Reviewed-by: Michael Pratt <mpratt@google.com>
This fixes:
export GOEXPERIMENT=unified
go install cmd
go install std cmd
go install std cmd
go test -short cmd/go -run=TestScript/test_relative_import_dash_i
That script test checks that runtime is non-stale, but whether it's stale
depends on the setting of GOEXPERIMENT. Stop filtering that variable out.
Change-Id: I71bdbca495c16981cdcddf4ab4d87a38ca72a389
Reviewed-on: https://go-review.googlesource.com/c/go/+/412874
Run-TryBot: Russ Cox <rsc@golang.org>
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Change-Id: Ica981657e50e30cbfa1757e8457819a479f11c7d
Reviewed-on: https://go-review.googlesource.com/c/go/+/412775
Reviewed-by: Ian Lance Taylor <iant@google.com>
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In each module matchPackages looks in, when doing the walk, do the
scanDir call in a par.Queue so all the read work can be done in
parallel.
Change-Id: I27153dbb3a2ed417ca24972f47134e9e914a55d1
Reviewed-on: https://go-review.googlesource.com/c/go/+/404097
Reviewed-by: Michael Matloob <matloob@golang.org>
Run-TryBot: Michael Matloob <matloob@golang.org>
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Currently, when we calculate the size of a carrier symbol, we use
the previous symbol's end address as the start. But the symbol
actually starts after applying the alignment. Do this in the
size calculation.
Should fix AIX build.
Updates #53372.
Change-Id: I17942b1fe8027dce12b78c8e8c80ea6cebcee240
Reviewed-on: https://go-review.googlesource.com/c/go/+/412734
Run-TryBot: Cherry Mui <cherryyz@google.com>
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Reviewed-by: Than McIntosh <thanm@google.com>
Add an additional example.
Fixes#53217.
Change-Id: I899376b9c1fa8dc5d475d8d3d6c8788ab79b0847
Reviewed-on: https://go-review.googlesource.com/c/go/+/412238
Reviewed-by: Robert Griesemer <gri@google.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Auto-Submit: Robert Griesemer <gri@google.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>
For #52870
Change-Id: Ic0791af4283c9e426f7cbfab0514517ff84cfa80
Reviewed-on: https://go-review.googlesource.com/c/go/+/412535
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Update the generator programs for the changes to syslist.go in CL
390274 and the changes to the generated files in CL 344955.
Tested by running the programs and verifying that the files did not
change.
Fixes#53299
Change-Id: I2b2c5769f7e9283aa05c803256d2ea1eb9ad1547
Reviewed-on: https://go-review.googlesource.com/c/go/+/411334
Reviewed-by: Daniel Martí <mvdan@mvdan.cc>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
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Change-Id: Icb552dc7106afbf6bd4bd3660d632f174153f834
Reviewed-on: https://go-review.googlesource.com/c/go/+/408914
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Ian Lance Taylor <iant@google.com>
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This is a rather large footgun, so let's mention that it sends the signal on thread termination and not process termination in the documentation.
Updates #27505
Change-Id: I489cf7136e34a1a7896067ae24187b0d523d987e
GitHub-Last-Rev: c8722b25d1
GitHub-Pull-Request: golang/go#53365
Reviewed-on: https://go-review.googlesource.com/c/go/+/412114
Reviewed-by: Ian Lance Taylor <iant@google.com>
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The specific error doesn't occur anymore.
Add a test to prevent regressions.
For #50729.
Change-Id: Ibf6ef6009b3d226b4f345b5a5657939915f19633
Reviewed-on: https://go-review.googlesource.com/c/go/+/412235
Reviewed-by: Robert Griesemer <gri@google.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>
Change-Id: Idb990eac60e334a5901b2d6cdc2380225d011dd6
Reviewed-on: https://go-review.googlesource.com/c/go/+/412294
Auto-Submit: Ian Lance Taylor <iant@google.com>
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All loong64 syscalls return values only via R4/A0, and R5/A1 may contain unrelated
content. Always zero the second return value.
Change-Id: I62af59369bece5bd8028b937c74f4694150f7a55
Reviewed-on: https://go-review.googlesource.com/c/go/+/411615
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Reviewed-by: Austin Clements <austin@google.com>
The existing error messages didn't add right parenthesis ')' properly
leading to improper formation of error messages.
Fixes#53283
Change-Id: Iadf9b8059403efa07e39716a81fab68cd10b7f87
Reviewed-on: https://go-review.googlesource.com/c/go/+/411015
Auto-Submit: Tobias Klauser <tobias.klauser@gmail.com>
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Reviewed-by: Damien Neil <dneil@google.com>
For carrier symbols like type.*, currently we don't set its
alignment. Normally it doesn't actually matter as we still align
the inner symbols. But in some cases it does make the symbol table
a bit weird, e.g. on darwin/arm64,
0000000000070000 s _runtime.types
0000000000070001 s _type.*
The address of the symbol _type.* is a bit weird. And the new
darwin linker from Xcode 14 beta doesn't like that (see issue
53372).
This CL aligns them.
Fixes#53372.
Change-Id: I1cb19dcf172e9a6bca248d85a7e54da76cbbc8a4
Reviewed-on: https://go-review.googlesource.com/c/go/+/411912
Reviewed-by: Than McIntosh <thanm@google.com>
Run-TryBot: Cherry Mui <cherryyz@google.com>
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Since CL 410821 we were indexing these modules with a cache key based
on the mtimes of the files within the module. However, that seems to
be causing test failures (#53269 and maybe #53371).
In addition, indexing these modules caused a potentially-expensive
operation (re-indexing a whole module) whenever any individual file
within the module is changed, even if it isn't relevant to the
package(s) being loaded from that module. In some cases, that could
cause a significant performance regression for 'go' commands invoked
on a small subset of the packages in the module (such as running 'go
test' on a single changed package — a common case during development).
Instead, we now index only those modules found within the module cache
and within GOROOT.
In addition, we now check mtimes when indexing GOROOT modules if the
Go version begins with the string "devel ", which indicates a
non-released Go version that may include local file edits within GOROOT.
For #53371.
For #53269.
Change-Id: Id3aa81b55ecfc478e47dd420148d39d2cf476f2d
Reviewed-on: https://go-review.googlesource.com/c/go/+/412394
Reviewed-by: Michael Matloob <matloob@golang.org>
Auto-Submit: Bryan Mills <bcmills@google.com>
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Matches examples in spec section on string conversions.
For #23814.
Change-Id: I08099c27bfdb98735868266f5a42901321b97b56
Reviewed-on: https://go-review.googlesource.com/c/go/+/412095
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For #33097
Change-Id: I6138dc844f0b29b01c78a02efc1e1b1ad719b803
Reviewed-on: https://go-review.googlesource.com/c/go/+/412139
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Auto-Submit: Ian Lance Taylor <iant@google.com>
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The spec section on conversions uses the terms "slice of bytes" and
"slice of runes". While not obviously clear, what is meant are slice
types whose element types are byte or rune types; specifically the
underlying types of the slices' element types must be byte or rune.
Some of this was evident from the examples, but not all of it. Made
this clearer by adding more examples illustrating various permitted
conversions.
Note that the 1.17 compiler did not accept the following conversions:
string([]myByte{...})
string([]myRune{...})
myString([]myByte{...})
myString([]myRune{...})
(where myByte, myRune, and myString have underlying types of byte,
rune, and string respectively) - it reported an internal error.
But it did accept the inverse conversions:
[]myByte("...")
[]myRune("...")
[]myByte(myString("..."))
[]myRune(myString("..."))
The 1.18 compiler made those conversions symmetric and they are now
permitted in both directions.
The extra examples reflect this reality.
Fixes#23814.
Change-Id: I5a1c200b45ddd0e8c0dc0d11da3a6c39cb2dc848
Reviewed-on: https://go-review.googlesource.com/c/go/+/412094
Reviewed-by: Robert Griesemer <gri@google.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>
Previously we stole a bit from the field offset to encode whether
a struct field was embedded.
Instead, encode that bit in the name field, where we already have
some unused bits to play with. The bit associates naturally with
the name in any case.
This leaves a full uintptr to specify field offsets. This will make
the fix for #52740 cleaner.
Change-Id: I0bfb85564dc26e8c18101bc8b432f332176d7836
Reviewed-on: https://go-review.googlesource.com/c/go/+/412138
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Fixes#53314
Change-Id: I4933b59ee247daec5cf96eb15c52ff54d3ec26a9
Reviewed-on: https://go-review.googlesource.com/c/go/+/411696
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Change-Id: Id6a27d0b3f3fc4181a00569bacc578e72b04ce09
GitHub-Last-Rev: 85c063d1a2
GitHub-Pull-Request: golang/go#53359
Reviewed-on: https://go-review.googlesource.com/c/go/+/411916
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For #51400
Change-Id: Ia5289dad84fb63ca6f16a40f076b5ef10511f6b0
Reviewed-on: https://go-review.googlesource.com/c/go/+/411116
Reviewed-by: David Chase <drchase@google.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
This change improves the robustness of the locklinear test in the
following ways:
* It removes allocations from the timing, which may be very variable if
we're unlucky.
* It ensures that goroutines are properly cleaned up before the test
function returns, reducing the chance that they bleed into repeat
attempts. It also stops timing before this cleanup.
Fixes#32986.
Change-Id: I3a8096e6922f23d899ad602e2845bdfc639ed742
Reviewed-on: https://go-review.googlesource.com/c/go/+/409894
Reviewed-by: Michael Pratt <mpratt@google.com>
This change moves test/locklinear.go into the sync package tests, and
adds a bit of infrastructure since there are other linearity-checking
tests that could benefit from it too. This infrastructure is also
different than what test/locklinear.go does: instead of trying really
hard to get at least one success, we instead treat this like a
performance test and look for a significant difference via a t-test.
This makes the methodology behind the tests more rigorous, and should
reduce flakiness as transient noise should produce an insignificant
result. A follow-up CL does more to make these tests even more robust.
For #32986.
Change-Id: I408c5f643962b70ea708930edb4ac9df1c6123ce
Reviewed-on: https://go-review.googlesource.com/c/go/+/411396
Reviewed-by: Michael Pratt <mpratt@google.com>
This CL copies code from github.com/aclements/go-moremath/stats and
github.com/aclements/go-moremath/mathx for Welch's t-test. Several
existing tests in the Go repository check performance and scalability,
and this import is part of a move toward a more rigorous measurement of
both.
Note that the copied code is already licensed to Go Authors, so there's
no need to worry about additional licensing considerations.
For #32986.
Change-Id: I058630fab7216d1a589bb182b69fa2231e6f5475
Reviewed-on: https://go-review.googlesource.com/c/go/+/411395
Reviewed-by: Michael Pratt <mpratt@google.com>
The Go website can be served on more than one domain (for example,
go.dev, golang.google.cn, tip.golang.org, localhost:6060, and so on).
Use relative links which work in all contexts.
For #51400.
Updates #53337.
Change-Id: I100938981447537ac242b4045929f6db8a2674c2
Reviewed-on: https://go-review.googlesource.com/c/go/+/411974
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Reviewed-by: Michael Knyszek <mknyszek@google.com>
No test because this isn't support on any of the builders.
Fixes#53285
Change-Id: If8d17bdcdac81a6ce404a35a289bf83f07f02855
Reviewed-on: https://go-review.googlesource.com/c/go/+/411698
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The spec already states that the precise behavior of the map size
hint provided to the make built-in is implementation-dependent.
Exclude requiring specific run-time behavior for maps.
(The current Go compiler does not panic if the size hint is negative
at run-time.)
Fixes#53219.
Change-Id: I2f3618bf9ba4ed921e18dc4f2273eaa770805bd7
Reviewed-on: https://go-review.googlesource.com/c/go/+/411919
Reviewed-by: Keith Randall <khr@google.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>
Reviewed-by: Keith Randall <khr@golang.org>
Types may be generic, so each occurrence of a TypeName may be
followed by optional type arguments. Add the missing syntactic
(EBNF) factor.
The syntax of type names followed by type arguments matches the
syntax of operand names followed by type arguments (operands may
also be types, or generic functions, among other things). This
opens the door to factoring out this shared syntax, but it will
also require some adjustments to prose to make it work well.
Leaving for another change.
Fixes#53240.
Change-Id: I15212225c28b27f7621e3ca80dfbd131f6b7eada
Reviewed-on: https://go-review.googlesource.com/c/go/+/411918
Reviewed-by: Ian Lance Taylor <iant@google.com>
Reviewed-by: Robert Griesemer <gri@google.com>
On darwin_arm64, reading from a socket at the same time as the other
end is closing it will occasionally hang for 60 seconds before
returning ECONNRESET. (This is a macOS issue, not a Go issue.)
Work around this condition by adding a brief sleep before the read.
Fixes#37795.
Change-Id: I63f92b91fb297cd66f89cdab707583afd50ab9c5
Reviewed-on: https://go-review.googlesource.com/c/go/+/411155
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For type assertions, if either src or dst type has shape, we must
convert them to dynamic type assertions.
Fixes#53309
Change-Id: Ia3362fa67c011febcbdb5b26f856d081b5c366de
Reviewed-on: https://go-review.googlesource.com/c/go/+/411617
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Closes an unclosed <code> tag, and tags a type that was untagged.
Change-Id: I9a1efda07f783f0ca7a93ffefbda4e29f5fc8d41
Reviewed-on: https://go-review.googlesource.com/c/go/+/411694
Auto-Submit: Roland Shoemaker <roland@golang.org>
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This documentation commit points to the latest RFC documenting HTTP codes
Change-Id: Ia7640664637f0c7846e2182353b787474bac7b4f
GitHub-Last-Rev: 5fb544ee32
GitHub-Pull-Request: golang/go#53318
Reviewed-on: https://go-review.googlesource.com/c/go/+/411475
Auto-Submit: Ian Lance Taylor <iant@google.com>
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Reviewed-by: Damien Neil <dneil@google.com>
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Change-Id: I8e94215d9bee0ea3ad378870fe565e961a9d80c9
Reviewed-on: https://go-review.googlesource.com/c/go/+/411595
Reviewed-by: Ian Lance Taylor <iant@google.com>
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It is only needed by cmd/dist, no need to build and install the
binary.
Change-Id: I6aba6b81496406077a0efba255c35020cff9d351
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Fixes#53013
Change-Id: I169d4eb2420a6da52cc9abe17da98c3092a91be6
Reviewed-on: https://go-review.googlesource.com/c/go/+/407514
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We occassionally see _beginthread failing with EACCES, meaning
"insufficient resources" according to the Microsoft documentation.
Exactly which resources is unclear.
Similar to pthread_create on unix systems, we can wait a bit and retry
to try to get success. The alternative is to abort, so we may as well
give it a try.
Fixes#52572.
Change-Id: I6e05add53b4ae36c61e53b1ee3fed6bc74e17dfa
Reviewed-on: https://go-review.googlesource.com/c/go/+/410355
Reviewed-by: Michael Knyszek <mknyszek@google.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Michael Pratt <mpratt@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
The bodies of cgo_sys_thread_start (and x_cgo_sys_thread_create) are
nearly identical on all of the windows ports.
Create a single _cgo_beginthread implementation that contains the body
and is used on all ports. This will reduce churn in an upcoming CL to
add retry logic.
We could theoretically have a single implementation of
_cgo_sys_thread_start shared by all ports, but I keep them separate for
ease of searching. Right now every single port implements this function
in their gcc_GOOS_GOARCH.c file, so it is nice to keep this symmetry.
_cgo_dummy_export must move out of libcgo_windows.h because it is a
definition and the inclusion of libcgo_windows.h in multiple files
creates duplicate definitions.
For #52572.
Change-Id: I9fa22009389349c754210274c7db2631b061f9c7
Reviewed-on: https://go-review.googlesource.com/c/go/+/410354
Run-TryBot: Michael Pratt <mpratt@google.com>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org>
