From 287decabfdadaff721f6be7d7efacea2413e9e43 Mon Sep 17 00:00:00 2001
From: Mark McGranaghan <mmcgrana@gmail.com>
Date: Sun, 30 Sep 2012 20:32:44 -0700
Subject: [PATCH] nonblocking channel operations

---
 .../nonblocking-channel-operations.go         | 35 +++++++++++++++++++
 .../closing-channels.go                       |  0
 src/{040-timers => 041-timers}/timers.go      |  0
 src/{040-timers => 041-timers}/tiners.sh      |  0
 src/{041-tickers => 042-tickers}/tickers.go   |  0
 src/{041-tickers => 042-tickers}/tickers.sh   |  0
 .../state-goroutine.go                        |  0
 src/{043-sorting => 044-sorting}/sorting.go   |  0
 src/{043-sorting => 044-sorting}/sorting.sh   |  0
 .../sorting-by-functions.go                   |  0
 .../sorting-by-functions.sh                   |  0
 .../collection-functions.go                   |  0
 .../string-functions.go                       |  0
 .../string-formatting.go                      |  0
 .../string-formatting.sh                      |  0
 src/{048-regexs => 049-regexs}/regexs.go      |  0
 src/{048-regexs => 049-regexs}/regexs.sh      |  0
 src/{049-bytes => 050-bytes}/bytes.go         |  0
 src/{050-json => 051-json}/json.go            |  0
 src/{051-time => 052-time}/time.go            |  0
 src/{051-time => 052-time}/time.sh            |  0
 src/{052-epochs => 053-epochs}/epochs.go      |  0
 src/{052-epochs => 053-epochs}/epochs.sh      |  0
 .../elapsed-time.go                           |  0
 .../random-numbers.go                         |  0
 .../random-numbers.sh                         |  0
 .../number-parsing.go                         |  0
 .../number-parsing.sh                         |  0
 src/{056-urls => 057-urls}/urls.go            |  0
 src/{056-urls => 057-urls}/urls.sh            |  0
 .../sha1-hashes.go                            |  0
 .../sha1-hashes.sh                            |  0
 .../base64-encoding.go                        |  0
 .../reading-files.go                          |  0
 .../writing-files.go                          |  0
 .../line-filters.go                           |  0
 .../line-filters.sh                           |  0
 .../command-line-arguments.go                 |  0
 .../command-line-arguments.sh                 |  0
 .../command-line-flags.go                     |  0
 .../environment-variables.go                  |  0
 .../environment-variables.sh                  |  0
 .../spawning-processes.go                     |  0
 .../spawning-processes.sh                     |  0
 .../execing-processes.go                      |  0
 src/{067-signals => 068-signals}/signals.go   |  0
 src/{067-signals => 068-signals}/signals.sh   |  0
 src/{068-exit => 069-exit}/exit.go            |  0
 src/{068-exit => 069-exit}/exit.sh            |  0
 .../http-client.go                            |  0
 .../https-client.go                           |  0
 src/{071-redis => 072-redis}/redis.go         |  0
 src/{071-redis => 072-redis}/redis.sh         |  0
 .../postgres.go                               |  0
 .../postgres.sh                               |  0
 .../sending-email.go                          |  0
 .../hello-web.go                              |  0
 .../responses.go                              |  0
 .../responses.sh                              |  0
 .../request-routing.go                        |  0
 .../request-routing.sh                        |  0
 .../request-logging.go                        |  0
 .../static-content.go                         |  0
 .../static-content.sh                         |  0
 .../basic-authentication.go                   |  0
 .../canonical-hosts.go                        |  0
 .../canonical-hosts.sh                        |  0
 .../middleware.go                             |  0
 .../graceful-shutdown.go                      |  0
 .../graceful-shutdown.sh                      |  0
 .../https-servers.go                          |  0
 .../https-servers.sh                          |  0
 tool/index.txt                                |  2 +-
 73 files changed, 36 insertions(+), 1 deletion(-)
 create mode 100644 src/039-nonblocking-channel-operations/nonblocking-channel-operations.go
 rename src/{039-closing-channels => 040-closing-channels}/closing-channels.go (100%)
 rename src/{040-timers => 041-timers}/timers.go (100%)
 rename src/{040-timers => 041-timers}/tiners.sh (100%)
 rename src/{041-tickers => 042-tickers}/tickers.go (100%)
 rename src/{041-tickers => 042-tickers}/tickers.sh (100%)
 rename src/{042-state-goroutine => 043-state-goroutine}/state-goroutine.go (100%)
 rename src/{043-sorting => 044-sorting}/sorting.go (100%)
 rename src/{043-sorting => 044-sorting}/sorting.sh (100%)
 rename src/{044-sorting-by-functions => 045-sorting-by-functions}/sorting-by-functions.go (100%)
 rename src/{044-sorting-by-functions => 045-sorting-by-functions}/sorting-by-functions.sh (100%)
 rename src/{045-collection-functions => 046-collection-functions}/collection-functions.go (100%)
 rename src/{046-string-functions => 047-string-functions}/string-functions.go (100%)
 rename src/{047-string-formatting => 048-string-formatting}/string-formatting.go (100%)
 rename src/{047-string-formatting => 048-string-formatting}/string-formatting.sh (100%)
 rename src/{048-regexs => 049-regexs}/regexs.go (100%)
 rename src/{048-regexs => 049-regexs}/regexs.sh (100%)
 rename src/{049-bytes => 050-bytes}/bytes.go (100%)
 rename src/{050-json => 051-json}/json.go (100%)
 rename src/{051-time => 052-time}/time.go (100%)
 rename src/{051-time => 052-time}/time.sh (100%)
 rename src/{052-epochs => 053-epochs}/epochs.go (100%)
 rename src/{052-epochs => 053-epochs}/epochs.sh (100%)
 rename src/{053-elapsed-time => 054-elapsed-time}/elapsed-time.go (100%)
 rename src/{054-random-numbers => 055-random-numbers}/random-numbers.go (100%)
 rename src/{054-random-numbers => 055-random-numbers}/random-numbers.sh (100%)
 rename src/{055-number-parsing => 056-number-parsing}/number-parsing.go (100%)
 rename src/{055-number-parsing => 056-number-parsing}/number-parsing.sh (100%)
 rename src/{056-urls => 057-urls}/urls.go (100%)
 rename src/{056-urls => 057-urls}/urls.sh (100%)
 rename src/{057-sha1-hashes => 058-sha1-hashes}/sha1-hashes.go (100%)
 rename src/{057-sha1-hashes => 058-sha1-hashes}/sha1-hashes.sh (100%)
 rename src/{058-base64-encoding => 059-base64-encoding}/base64-encoding.go (100%)
 rename src/{059-reading-files => 060-reading-files}/reading-files.go (100%)
 rename src/{060-writing-files => 061-writing-files}/writing-files.go (100%)
 rename src/{061-line-filters => 062-line-filters}/line-filters.go (100%)
 rename src/{061-line-filters => 062-line-filters}/line-filters.sh (100%)
 rename src/{062-command-line-arguments => 063-command-line-arguments}/command-line-arguments.go (100%)
 rename src/{062-command-line-arguments => 063-command-line-arguments}/command-line-arguments.sh (100%)
 rename src/{063-command-line-flags => 064-command-line-flags}/command-line-flags.go (100%)
 rename src/{064-environment-variables => 065-environment-variables}/environment-variables.go (100%)
 rename src/{064-environment-variables => 065-environment-variables}/environment-variables.sh (100%)
 rename src/{065-spawning-processes => 066-spawning-processes}/spawning-processes.go (100%)
 rename src/{065-spawning-processes => 066-spawning-processes}/spawning-processes.sh (100%)
 rename src/{066-execing-processes => 067-execing-processes}/execing-processes.go (100%)
 rename src/{067-signals => 068-signals}/signals.go (100%)
 rename src/{067-signals => 068-signals}/signals.sh (100%)
 rename src/{068-exit => 069-exit}/exit.go (100%)
 rename src/{068-exit => 069-exit}/exit.sh (100%)
 rename src/{069-http-client => 070-http-client}/http-client.go (100%)
 rename src/{070-https-client => 071-https-client}/https-client.go (100%)
 rename src/{071-redis => 072-redis}/redis.go (100%)
 rename src/{071-redis => 072-redis}/redis.sh (100%)
 rename src/{072-postgres => 073-postgres}/postgres.go (100%)
 rename src/{072-postgres => 073-postgres}/postgres.sh (100%)
 rename src/{073-sending-email => 074-sending-email}/sending-email.go (100%)
 rename src/{074-hello-web => 075-hello-web}/hello-web.go (100%)
 rename src/{075-responses => 076-responses}/responses.go (100%)
 rename src/{075-responses => 076-responses}/responses.sh (100%)
 rename src/{076-request-routing => 077-request-routing}/request-routing.go (100%)
 rename src/{076-request-routing => 077-request-routing}/request-routing.sh (100%)
 rename src/{077-request-logging => 078-request-logging}/request-logging.go (100%)
 rename src/{078-static-content => 079-static-content}/static-content.go (100%)
 rename src/{078-static-content => 079-static-content}/static-content.sh (100%)
 rename src/{079-basic-authentication => 080-basic-authentication}/basic-authentication.go (100%)
 rename src/{080-canonical-hosts => 081-canonical-hosts}/canonical-hosts.go (100%)
 rename src/{080-canonical-hosts => 081-canonical-hosts}/canonical-hosts.sh (100%)
 rename src/{081-middleware => 082-middleware}/middleware.go (100%)
 rename src/{082-graceful-shutdown => 083-graceful-shutdown}/graceful-shutdown.go (100%)
 rename src/{082-graceful-shutdown => 083-graceful-shutdown}/graceful-shutdown.sh (100%)
 rename src/{083-https-servers => 084-https-servers}/https-servers.go (100%)
 rename src/{083-https-servers => 084-https-servers}/https-servers.sh (100%)

diff --git a/src/039-nonblocking-channel-operations/nonblocking-channel-operations.go b/src/039-nonblocking-channel-operations/nonblocking-channel-operations.go
new file mode 100644
index 0000000..726e0f0
--- /dev/null
+++ b/src/039-nonblocking-channel-operations/nonblocking-channel-operations.go
@@ -0,0 +1,35 @@
+package main
+
+import "fmt"
+
+func main() {
+	messages := make(chan string)
+	signals := make(chan bool)
+
+	// Non-blocking receive.
+	select {
+	case msg := <- messages:
+		fmt.Println("received message", msg)
+	default:
+		fmt.Println("no messages received")
+	}
+
+	// Non-blocking send.
+	msg := "hi"
+	select {
+	case messages <- msg:
+		fmt.Println("sent message", msg)
+	default:
+		fmt.Println("no messages sent")
+	}
+
+	// Non-blocking multi-way select.
+	select {
+	case msg := <- messages:
+		fmt.Println("received message", msg)
+	case sig := <- signals:
+		fmt.Println("received signal", sig)
+	default:
+		fmt.Println("no activity")
+	}
+}
diff --git a/src/039-closing-channels/closing-channels.go b/src/040-closing-channels/closing-channels.go
similarity index 100%
rename from src/039-closing-channels/closing-channels.go
rename to src/040-closing-channels/closing-channels.go
diff --git a/src/040-timers/timers.go b/src/041-timers/timers.go
similarity index 100%
rename from src/040-timers/timers.go
rename to src/041-timers/timers.go
diff --git a/src/040-timers/tiners.sh b/src/041-timers/tiners.sh
similarity index 100%
rename from src/040-timers/tiners.sh
rename to src/041-timers/tiners.sh
diff --git a/src/041-tickers/tickers.go b/src/042-tickers/tickers.go
similarity index 100%
rename from src/041-tickers/tickers.go
rename to src/042-tickers/tickers.go
diff --git a/src/041-tickers/tickers.sh b/src/042-tickers/tickers.sh
similarity index 100%
rename from src/041-tickers/tickers.sh
rename to src/042-tickers/tickers.sh
diff --git a/src/042-state-goroutine/state-goroutine.go b/src/043-state-goroutine/state-goroutine.go
similarity index 100%
rename from src/042-state-goroutine/state-goroutine.go
rename to src/043-state-goroutine/state-goroutine.go
diff --git a/src/043-sorting/sorting.go b/src/044-sorting/sorting.go
similarity index 100%
rename from src/043-sorting/sorting.go
rename to src/044-sorting/sorting.go
diff --git a/src/043-sorting/sorting.sh b/src/044-sorting/sorting.sh
similarity index 100%
rename from src/043-sorting/sorting.sh
rename to src/044-sorting/sorting.sh
diff --git a/src/044-sorting-by-functions/sorting-by-functions.go b/src/045-sorting-by-functions/sorting-by-functions.go
similarity index 100%
rename from src/044-sorting-by-functions/sorting-by-functions.go
rename to src/045-sorting-by-functions/sorting-by-functions.go
diff --git a/src/044-sorting-by-functions/sorting-by-functions.sh b/src/045-sorting-by-functions/sorting-by-functions.sh
similarity index 100%
rename from src/044-sorting-by-functions/sorting-by-functions.sh
rename to src/045-sorting-by-functions/sorting-by-functions.sh
diff --git a/src/045-collection-functions/collection-functions.go b/src/046-collection-functions/collection-functions.go
similarity index 100%
rename from src/045-collection-functions/collection-functions.go
rename to src/046-collection-functions/collection-functions.go
diff --git a/src/046-string-functions/string-functions.go b/src/047-string-functions/string-functions.go
similarity index 100%
rename from src/046-string-functions/string-functions.go
rename to src/047-string-functions/string-functions.go
diff --git a/src/047-string-formatting/string-formatting.go b/src/048-string-formatting/string-formatting.go
similarity index 100%
rename from src/047-string-formatting/string-formatting.go
rename to src/048-string-formatting/string-formatting.go
diff --git a/src/047-string-formatting/string-formatting.sh b/src/048-string-formatting/string-formatting.sh
similarity index 100%
rename from src/047-string-formatting/string-formatting.sh
rename to src/048-string-formatting/string-formatting.sh
diff --git a/src/048-regexs/regexs.go b/src/049-regexs/regexs.go
similarity index 100%
rename from src/048-regexs/regexs.go
rename to src/049-regexs/regexs.go
diff --git a/src/048-regexs/regexs.sh b/src/049-regexs/regexs.sh
similarity index 100%
rename from src/048-regexs/regexs.sh
rename to src/049-regexs/regexs.sh
diff --git a/src/049-bytes/bytes.go b/src/050-bytes/bytes.go
similarity index 100%
rename from src/049-bytes/bytes.go
rename to src/050-bytes/bytes.go
diff --git a/src/050-json/json.go b/src/051-json/json.go
similarity index 100%
rename from src/050-json/json.go
rename to src/051-json/json.go
diff --git a/src/051-time/time.go b/src/052-time/time.go
similarity index 100%
rename from src/051-time/time.go
rename to src/052-time/time.go
diff --git a/src/051-time/time.sh b/src/052-time/time.sh
similarity index 100%
rename from src/051-time/time.sh
rename to src/052-time/time.sh
diff --git a/src/052-epochs/epochs.go b/src/053-epochs/epochs.go
similarity index 100%
rename from src/052-epochs/epochs.go
rename to src/053-epochs/epochs.go
diff --git a/src/052-epochs/epochs.sh b/src/053-epochs/epochs.sh
similarity index 100%
rename from src/052-epochs/epochs.sh
rename to src/053-epochs/epochs.sh
diff --git a/src/053-elapsed-time/elapsed-time.go b/src/054-elapsed-time/elapsed-time.go
similarity index 100%
rename from src/053-elapsed-time/elapsed-time.go
rename to src/054-elapsed-time/elapsed-time.go
diff --git a/src/054-random-numbers/random-numbers.go b/src/055-random-numbers/random-numbers.go
similarity index 100%
rename from src/054-random-numbers/random-numbers.go
rename to src/055-random-numbers/random-numbers.go
diff --git a/src/054-random-numbers/random-numbers.sh b/src/055-random-numbers/random-numbers.sh
similarity index 100%
rename from src/054-random-numbers/random-numbers.sh
rename to src/055-random-numbers/random-numbers.sh
diff --git a/src/055-number-parsing/number-parsing.go b/src/056-number-parsing/number-parsing.go
similarity index 100%
rename from src/055-number-parsing/number-parsing.go
rename to src/056-number-parsing/number-parsing.go
diff --git a/src/055-number-parsing/number-parsing.sh b/src/056-number-parsing/number-parsing.sh
similarity index 100%
rename from src/055-number-parsing/number-parsing.sh
rename to src/056-number-parsing/number-parsing.sh
diff --git a/src/056-urls/urls.go b/src/057-urls/urls.go
similarity index 100%
rename from src/056-urls/urls.go
rename to src/057-urls/urls.go
diff --git a/src/056-urls/urls.sh b/src/057-urls/urls.sh
similarity index 100%
rename from src/056-urls/urls.sh
rename to src/057-urls/urls.sh
diff --git a/src/057-sha1-hashes/sha1-hashes.go b/src/058-sha1-hashes/sha1-hashes.go
similarity index 100%
rename from src/057-sha1-hashes/sha1-hashes.go
rename to src/058-sha1-hashes/sha1-hashes.go
diff --git a/src/057-sha1-hashes/sha1-hashes.sh b/src/058-sha1-hashes/sha1-hashes.sh
similarity index 100%
rename from src/057-sha1-hashes/sha1-hashes.sh
rename to src/058-sha1-hashes/sha1-hashes.sh
diff --git a/src/058-base64-encoding/base64-encoding.go b/src/059-base64-encoding/base64-encoding.go
similarity index 100%
rename from src/058-base64-encoding/base64-encoding.go
rename to src/059-base64-encoding/base64-encoding.go
diff --git a/src/059-reading-files/reading-files.go b/src/060-reading-files/reading-files.go
similarity index 100%
rename from src/059-reading-files/reading-files.go
rename to src/060-reading-files/reading-files.go
diff --git a/src/060-writing-files/writing-files.go b/src/061-writing-files/writing-files.go
similarity index 100%
rename from src/060-writing-files/writing-files.go
rename to src/061-writing-files/writing-files.go
diff --git a/src/061-line-filters/line-filters.go b/src/062-line-filters/line-filters.go
similarity index 100%
rename from src/061-line-filters/line-filters.go
rename to src/062-line-filters/line-filters.go
diff --git a/src/061-line-filters/line-filters.sh b/src/062-line-filters/line-filters.sh
similarity index 100%
rename from src/061-line-filters/line-filters.sh
rename to src/062-line-filters/line-filters.sh
diff --git a/src/062-command-line-arguments/command-line-arguments.go b/src/063-command-line-arguments/command-line-arguments.go
similarity index 100%
rename from src/062-command-line-arguments/command-line-arguments.go
rename to src/063-command-line-arguments/command-line-arguments.go
diff --git a/src/062-command-line-arguments/command-line-arguments.sh b/src/063-command-line-arguments/command-line-arguments.sh
similarity index 100%
rename from src/062-command-line-arguments/command-line-arguments.sh
rename to src/063-command-line-arguments/command-line-arguments.sh
diff --git a/src/063-command-line-flags/command-line-flags.go b/src/064-command-line-flags/command-line-flags.go
similarity index 100%
rename from src/063-command-line-flags/command-line-flags.go
rename to src/064-command-line-flags/command-line-flags.go
diff --git a/src/064-environment-variables/environment-variables.go b/src/065-environment-variables/environment-variables.go
similarity index 100%
rename from src/064-environment-variables/environment-variables.go
rename to src/065-environment-variables/environment-variables.go
diff --git a/src/064-environment-variables/environment-variables.sh b/src/065-environment-variables/environment-variables.sh
similarity index 100%
rename from src/064-environment-variables/environment-variables.sh
rename to src/065-environment-variables/environment-variables.sh
diff --git a/src/065-spawning-processes/spawning-processes.go b/src/066-spawning-processes/spawning-processes.go
similarity index 100%
rename from src/065-spawning-processes/spawning-processes.go
rename to src/066-spawning-processes/spawning-processes.go
diff --git a/src/065-spawning-processes/spawning-processes.sh b/src/066-spawning-processes/spawning-processes.sh
similarity index 100%
rename from src/065-spawning-processes/spawning-processes.sh
rename to src/066-spawning-processes/spawning-processes.sh
diff --git a/src/066-execing-processes/execing-processes.go b/src/067-execing-processes/execing-processes.go
similarity index 100%
rename from src/066-execing-processes/execing-processes.go
rename to src/067-execing-processes/execing-processes.go
diff --git a/src/067-signals/signals.go b/src/068-signals/signals.go
similarity index 100%
rename from src/067-signals/signals.go
rename to src/068-signals/signals.go
diff --git a/src/067-signals/signals.sh b/src/068-signals/signals.sh
similarity index 100%
rename from src/067-signals/signals.sh
rename to src/068-signals/signals.sh
diff --git a/src/068-exit/exit.go b/src/069-exit/exit.go
similarity index 100%
rename from src/068-exit/exit.go
rename to src/069-exit/exit.go
diff --git a/src/068-exit/exit.sh b/src/069-exit/exit.sh
similarity index 100%
rename from src/068-exit/exit.sh
rename to src/069-exit/exit.sh
diff --git a/src/069-http-client/http-client.go b/src/070-http-client/http-client.go
similarity index 100%
rename from src/069-http-client/http-client.go
rename to src/070-http-client/http-client.go
diff --git a/src/070-https-client/https-client.go b/src/071-https-client/https-client.go
similarity index 100%
rename from src/070-https-client/https-client.go
rename to src/071-https-client/https-client.go
diff --git a/src/071-redis/redis.go b/src/072-redis/redis.go
similarity index 100%
rename from src/071-redis/redis.go
rename to src/072-redis/redis.go
diff --git a/src/071-redis/redis.sh b/src/072-redis/redis.sh
similarity index 100%
rename from src/071-redis/redis.sh
rename to src/072-redis/redis.sh
diff --git a/src/072-postgres/postgres.go b/src/073-postgres/postgres.go
similarity index 100%
rename from src/072-postgres/postgres.go
rename to src/073-postgres/postgres.go
diff --git a/src/072-postgres/postgres.sh b/src/073-postgres/postgres.sh
similarity index 100%
rename from src/072-postgres/postgres.sh
rename to src/073-postgres/postgres.sh
diff --git a/src/073-sending-email/sending-email.go b/src/074-sending-email/sending-email.go
similarity index 100%
rename from src/073-sending-email/sending-email.go
rename to src/074-sending-email/sending-email.go
diff --git a/src/074-hello-web/hello-web.go b/src/075-hello-web/hello-web.go
similarity index 100%
rename from src/074-hello-web/hello-web.go
rename to src/075-hello-web/hello-web.go
diff --git a/src/075-responses/responses.go b/src/076-responses/responses.go
similarity index 100%
rename from src/075-responses/responses.go
rename to src/076-responses/responses.go
diff --git a/src/075-responses/responses.sh b/src/076-responses/responses.sh
similarity index 100%
rename from src/075-responses/responses.sh
rename to src/076-responses/responses.sh
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diff --git a/src/077-request-logging/request-logging.go b/src/078-request-logging/request-logging.go
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rename to src/078-request-logging/request-logging.go
diff --git a/src/078-static-content/static-content.go b/src/079-static-content/static-content.go
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diff --git a/src/080-canonical-hosts/canonical-hosts.go b/src/081-canonical-hosts/canonical-hosts.go
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diff --git a/src/081-middleware/middleware.go b/src/082-middleware/middleware.go
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rename to src/083-graceful-shutdown/graceful-shutdown.go
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rename to src/083-graceful-shutdown/graceful-shutdown.sh
diff --git a/src/083-https-servers/https-servers.go b/src/084-https-servers/https-servers.go
similarity index 100%
rename from src/083-https-servers/https-servers.go
rename to src/084-https-servers/https-servers.go
diff --git a/src/083-https-servers/https-servers.sh b/src/084-https-servers/https-servers.sh
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diff --git a/tool/index.txt b/tool/index.txt
index c1cffd5..98b30b0 100644
--- a/tool/index.txt
+++ b/tool/index.txt
@@ -43,7 +43,7 @@ timeouts
 scatter-gather
 rate-limiting
 worker-pools
-nonblocking-channel-operations ~
+nonblocking-channel-operations
 closing-channels
 timers
 tickers