From 554fd8c5195424bdbcabf5de30fdc183aba391bd Mon Sep 17 00:00:00 2001
From: upstream source tree <ports@midipix.org>
Date: Sun, 15 Mar 2015 20:14:05 -0400
Subject: obtained gcc-4.6.4.tar.bz2 from upstream website; verified
 gcc-4.6.4.tar.bz2.sig; imported gcc-4.6.4 source tree from verified upstream
 tarball.

downloading a git-generated archive based on the 'upstream' tag
should provide you with a source tree that is binary identical
to the one extracted from the above tarball.

if you have obtained the source via the command 'git clone',
however, do note that line-endings of files in your working
directory might differ from line-endings of the respective
files in the upstream repository.
---
 gcc/testsuite/go.test/test/chan/select3.go | 203 +++++++++++++++++++++++++++++
 1 file changed, 203 insertions(+)
 create mode 100644 gcc/testsuite/go.test/test/chan/select3.go

(limited to 'gcc/testsuite/go.test/test/chan/select3.go')

diff --git a/gcc/testsuite/go.test/test/chan/select3.go b/gcc/testsuite/go.test/test/chan/select3.go
new file mode 100644
index 000000000..a1a2ef50b
--- /dev/null
+++ b/gcc/testsuite/go.test/test/chan/select3.go
@@ -0,0 +1,203 @@
+// $G $D/$F.go && $L $F.$A && ./$A.out
+
+// Copyright 2010 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Tests verifying the semantics of the select statement
+// for basic empty/non-empty cases.
+
+package main
+
+import "time"
+
+const always = "function did not"
+const never = "function did"
+
+
+func unreachable() {
+	panic("control flow shouldn't reach here")
+}
+
+
+// Calls f and verifies that f always/never panics depending on signal.
+func testPanic(signal string, f func()) {
+	defer func() {
+		s := never
+		if recover() != nil {
+			s = always // f panicked
+		}
+		if s != signal {
+			panic(signal + " panic")
+		}
+	}()
+	f()
+}
+
+
+// Calls f and empirically verifies that f always/never blocks depending on signal.
+func testBlock(signal string, f func()) {
+	c := make(chan string)
+	go func() {
+		f()
+		c <- never // f didn't block
+	}()
+	go func() {
+		time.Sleep(1e8) // 0.1s seems plenty long
+		c <- always     // f blocked always
+	}()
+	if <-c != signal {
+		panic(signal + " block")
+	}
+}
+
+
+func main() {
+	const async = 1 // asynchronous channels
+	var nilch chan int
+	closedch := make(chan int)
+	close(closedch)
+
+	// sending/receiving from a nil channel outside a select panics
+	testPanic(always, func() {
+		nilch <- 7
+	})
+	testPanic(always, func() {
+		<-nilch
+	})
+
+	// sending/receiving from a nil channel inside a select never panics
+	testPanic(never, func() {
+		select {
+		case nilch <- 7:
+			unreachable()
+		default:
+		}
+	})
+	testPanic(never, func() {
+		select {
+		case <-nilch:
+			unreachable()
+		default:
+		}
+	})
+
+	// sending to an async channel with free buffer space never blocks
+	testBlock(never, func() {
+		ch := make(chan int, async)
+		ch <- 7
+	})
+
+	// receiving (a small number of times) from a closed channel never blocks
+	testBlock(never, func() {
+		for i := 0; i < 10; i++ {
+			if <-closedch != 0 {
+				panic("expected zero value when reading from closed channel")
+			}
+		}
+	})
+
+	// sending (a small number of times) to a closed channel is not specified
+	// but the current implementation doesn't block: test that different
+	// implementations behave the same
+	testBlock(never, func() {
+		for i := 0; i < 10; i++ {
+			closedch <- 7
+		}
+	})
+
+	// receiving from a non-ready channel always blocks
+	testBlock(always, func() {
+		ch := make(chan int)
+		<-ch
+	})
+
+	// empty selects always block
+	testBlock(always, func() {
+		select {
+		}
+	})
+
+	// selects with only nil channels always block
+	testBlock(always, func() {
+		select {
+		case <-nilch:
+			unreachable()
+		}
+	})
+	testBlock(always, func() {
+		select {
+		case nilch <- 7:
+			unreachable()
+		}
+	})
+	testBlock(always, func() {
+		select {
+		case <-nilch:
+			unreachable()
+		case nilch <- 7:
+			unreachable()
+		}
+	})
+
+	// selects with non-ready non-nil channels always block
+	testBlock(always, func() {
+		ch := make(chan int)
+		select {
+		case <-ch:
+			unreachable()
+		}
+	})
+
+	// selects with default cases don't block
+	testBlock(never, func() {
+		select {
+		default:
+		}
+	})
+	testBlock(never, func() {
+		select {
+		case <-nilch:
+			unreachable()
+		default:
+		}
+	})
+	testBlock(never, func() {
+		select {
+		case nilch <- 7:
+			unreachable()
+		default:
+		}
+	})
+
+	// selects with ready channels don't block
+	testBlock(never, func() {
+		ch := make(chan int, async)
+		select {
+		case ch <- 7:
+		default:
+			unreachable()
+		}
+	})
+	testBlock(never, func() {
+		ch := make(chan int, async)
+		ch <- 7
+		select {
+		case <-ch:
+		default:
+			unreachable()
+		}
+	})
+
+	// selects with closed channels don't block
+	testBlock(never, func() {
+		select {
+		case <-closedch:
+		}
+	})
+	testBlock(never, func() {
+		select {
+		case closedch <- 7:
+		}
+	})
+}
-- 
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