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Alan Donovan 5a2875abe7 go/loader: reduce contention for findPackage mutex 
...by making the cache non-blocking and duplicate-suppressing.

(The bottleneck was introduced while adding vendoring support.)
This reduces the 95th percentile map shard time for type-checking 120K
packages to 8min from 20min.

Also: move the I/O-limiting counting semaphore and the NoGoError check
from FindPackage to findPackage so that all implementations benefit.

Change-Id: I43527122262cf80475dd3212d78c340e1c71e36c
Reviewed-on: https://go-review.googlesource.com/18580
Reviewed-by: Robert Griesemer <gri@golang.org>
 		2016-01-13 18:09:25 +00:00
..
ast/astutil go/ast/astutil: set Pos for import name 2015-05-19 23:10:16 +00:00
buildutil tools: fallout from flipped sense of build.IgnoreVendor flag 2016-01-08 18:54:48 +00:00
callgraph tools: switch to standard go/types at tip 2016-01-06 22:15:26 +00:00
exact tools: add import comments. 2014-12-09 22:42:16 +00:00
gccgoimporter x/tools: disable tests not supported on Android 2015-08-06 00:36:03 +00:00
gcimporter go/types: change {Type,Object,Selection}String to accept a Qualifier function 2015-06-30 19:00:00 +00:00
gcimporter15 go/gcimporter15: a copy of go/gcimporter using go1.5 std go/types 2016-01-07 18:06:54 +00:00
importer go/importer: in TestImportStdLib, skip 2 packages that use vendoring 2015-12-28 21:28:10 +00:00
loader go/loader: reduce contention for findPackage mutex 2016-01-13 18:09:25 +00:00
pointer tools: switch to standard go/types at tip 2016-01-06 22:15:26 +00:00
ssa tools: switch to standard go/types at tip 2016-01-06 22:15:26 +00:00
types tools: switch to standard go/types at tip 2016-01-06 22:15:26 +00:00
vcs go/vcs: workaround EOF bug in token-based XML decoder 2015-12-29 20:27:04 +00:00