vendor: Update golang.org/cznic/...

vendor/github.com/cznic/b/doc.go

@@ -6,10 +6,30 @@
 //
 // Changelog
 //
+// 2016-07-16: Update benchmark results to newer Go version. Add a note on
+// concurrency.
+//
 // 2014-06-26: Lower GC presure by recycling things.
 //
 // 2014-04-18: Added new method Put.
 //
+// Concurrency considerations
+//
+// Tree.{Clear,Delete,Put,Set} mutate the tree. One can use eg. a
+// sync.Mutex.Lock/Unlock (or sync.RWMutex.Lock/Unlock) to wrap those calls if
+// they are to be invoked concurrently.
+//
+// Tree.{First,Get,Last,Len,Seek,SeekFirst,SekLast} read but do not mutate the
+// tree.  One can use eg. a sync.RWMutex.RLock/RUnlock to wrap those calls if
+// they are to be invoked concurrently with any of the tree mutating methods.
+//
+// Enumerator.{Next,Prev} mutate the enumerator and read but not mutate the
+// tree.  One can use eg. a sync.RWMutex.RLock/RUnlock to wrap those calls if
+// they are to be invoked concurrently with any of the tree mutating methods. A
+// separate mutex for the enumerator, or the whole tree in a simplified
+// variant, is necessary if the enumerator's Next/Prev methods per se are to
+// be invoked concurrently.
+//
 // Generic types
 //
 // Keys and their associated values are interface{} typed, similar to all of
@@ -34,20 +54,20 @@
 // No other changes to int.go are necessary, it compiles just fine.
 //
 // Running the benchmarks for 1000 keys on a machine with Intel i5-4670 CPU @
-// 3.4GHz, Go release 1.4.2.
+// 3.4GHz, Go 1.7rc1.
 //
 //	$ go test -bench 1e3 example/all_test.go example/int.go
+//	BenchmarkSetSeq1e3-4    	   20000	     78265 ns/op
+//	BenchmarkGetSeq1e3-4    	   20000	     67980 ns/op
+//	BenchmarkSetRnd1e3-4    	   10000	    172720 ns/op
+//	BenchmarkGetRnd1e3-4    	   20000	     89539 ns/op
+//	BenchmarkDelSeq1e3-4    	   20000	     87863 ns/op
+//	BenchmarkDelRnd1e3-4    	   10000	    130891 ns/op
+//	BenchmarkSeekSeq1e3-4   	   10000	    100118 ns/op
+//	BenchmarkSeekRnd1e3-4   	   10000	    121684 ns/op
+//	BenchmarkNext1e3-4      	  200000	      6330 ns/op
+//	BenchmarkPrev1e3-4      	  200000	      9066 ns/op
 //	PASS
-//	BenchmarkSetSeq1e3	   10000	    151620 ns/op
-//	BenchmarkGetSeq1e3	   10000	    115354 ns/op
-//	BenchmarkSetRnd1e3	    5000	    255865 ns/op
-//	BenchmarkGetRnd1e3	   10000	    140466 ns/op
-//	BenchmarkDelSeq1e3	   10000	    143860 ns/op
-//	BenchmarkDelRnd1e3	   10000	    188228 ns/op
-//	BenchmarkSeekSeq1e3	   10000	    156448 ns/op
-//	BenchmarkSeekRnd1e3	   10000	    190587 ns/op
-//	BenchmarkNext1e3	  200000	      9407 ns/op
-//	BenchmarkPrev1e3	  200000	      9306 ns/op
-//	ok  	command-line-arguments	26.369s
+//	ok  	command-line-arguments	42.531s
 //	$
 package b