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doc/go1.2.html: pre-emption; cgo and C++

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These were bullet points that I had neglected to flesh out.

R=golang-dev, dvyukov
CC=golang-dev
https://golang.org/cl/13816043
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Rob Pike 2013-09-21 17:53:44 +10:00
parent 1c45f98fa3
commit e4c1fffcb1
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@ -125,15 +125,25 @@ This is a backwards-compatible change that affects no existing programs.
<h2 id="impl">Changes to the implementations and tools</h2>
<ul>
<li>
runtime: preemption of goroutines at function entry (CL 12371043).
</li>
<h3 id="preemption">Pre-emption in the scheduler</h3>
<li>
go/build: support including C++ code with cgo (CL 8248043).
</li>
</ul>
<p>
In prior releases, a goroutine that was looping forever could starve out other
goroutines on the same thread, a serious problem when GOMAXPROCS
provided only one user thread.
In Go1.2, this is partially addressed: The scheduler is invoked occasionally
upon entry to a function.
This means that any loop that includes a (non-inlined) function call can
be pre-empted, allowing other goroutines to run on the same thread.
</p>
<h3 id="cgo_and_cpp">Cgo and C++</h3>
<p>
The <a href="/cmd/cgo/"><code>cgo</code></a> command will now invoke the C++
compiler to build any pieces of the linked-to library that are written in C++; the
documentation has more detail.
</p>
<h3 id="go_tools_godoc">Godoc and vet moved to the go.tools subrepository</h3>