From 554fd8c5195424bdbcabf5de30fdc183aba391bd Mon Sep 17 00:00:00 2001 From: upstream source tree 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. --- libgo/runtime/go-chan-cap.c | 41 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 41 insertions(+) create mode 100644 libgo/runtime/go-chan-cap.c (limited to 'libgo/runtime/go-chan-cap.c') diff --git a/libgo/runtime/go-chan-cap.c b/libgo/runtime/go-chan-cap.c new file mode 100644 index 000000000..df603bf10 --- /dev/null +++ b/libgo/runtime/go-chan-cap.c @@ -0,0 +1,41 @@ +/* go-chan-cap.c -- the cap function applied to a channel. + + Copyright 2009 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. */ + +#include + +#include "go-assert.h" +#include "channel.h" + +/* Return the cap function applied to a channel--the size of the + buffer. This could be done inline but I'm doing it as a function + for now to make it easy to change the channel structure. */ + +size_t +__go_chan_cap (struct __go_channel *channel) +{ + int i; + size_t ret; + + if (channel == NULL) + return 0; + + i = pthread_mutex_lock (&channel->lock); + __go_assert (i == 0); + + if (channel->num_entries == 0) + ret = 0; + else + { + /* One slot is always unused. We added 1 when we created the + channel. */ + ret = channel->num_entries - 1; + } + + i = pthread_mutex_unlock (&channel->lock); + __go_assert (i == 0); + + return ret; +} -- cgit v1.2.3