statement, or a possibly labeled <a href="#Fallthrough_statements">"fallthrough"
	    statement</a>.</li>
	</ul>
</li>

<li>
	A <a href="#Select_statements">"select" statement</a> in which:
	<ul>
	<li>there are no "break" statements referring to the "select" statement, and</li>
	<li>the statement lists in each case, including the default if present,
	    end in a terminating statement.</li>
	</ul>
</li>

	Example:
	//go:cgo_ldflag "-lpthread"
	//go:cgo_ldflag "-L/usr/local/sqlite3/lib"

A package compiled with cgo will include directives for both
internal and external linking; the linker will select the appropriate
subset for the chosen linking mode.

Example

As a simple example, consider a package that uses cgo to call C.sin.
The following code will be generated by cgo:

	// compiled by gc

	return 0, nil
}

func TestZeroReader(t *testing.T) {
	var z zeroReader
	r := NewReader(z)

	c := make(chan error)
	go func() {
		_, err := r.ReadByte()
		c <- err
	}()

	select {
	case err := <-c:
		if err == nil {
			t.Error("error expected")
		} else if err != io.ErrNoProgress {
			t.Error("unexpected error:", err)
		}
	case <-time.After(time.Second):

pkg syscall (freebsd-arm64), const SYS_PROFIL = 44
pkg syscall (freebsd-arm64), const SYS_PROFIL ideal-int
pkg syscall (freebsd-arm64), const SYS_PSELECT = 522
pkg syscall (freebsd-arm64), const SYS_PSELECT ideal-int
pkg syscall (freebsd-arm64), const SYS_PTRACE = 26
pkg syscall (freebsd-arm64), const SYS_PTRACE ideal-int
pkg syscall (freebsd-arm64), const SYS_PWRITE = 476

pkg syscall (darwin-arm64), const SYS_SEARCHFS ideal-int
pkg syscall (darwin-arm64), const SYS_SELECT = 93
pkg syscall (darwin-arm64), const SYS_SELECT ideal-int
pkg syscall (darwin-arm64), const SYS_SELECT_NOCANCEL = 407
pkg syscall (darwin-arm64), const SYS_SELECT_NOCANCEL ideal-int
pkg syscall (darwin-arm64), const SYS_SEMCTL = 254
pkg syscall (darwin-arm64), const SYS_SEMCTL ideal-int

pkg syscall (freebsd-riscv64), const SYS_PROFIL = 44 #53466
pkg syscall (freebsd-riscv64), const SYS_PROFIL ideal-int #53466
pkg syscall (freebsd-riscv64), const SYS_PSELECT = 522 #53466
pkg syscall (freebsd-riscv64), const SYS_PSELECT ideal-int #53466
pkg syscall (freebsd-riscv64), const SYS_PTRACE = 26 #53466
pkg syscall (freebsd-riscv64), const SYS_PTRACE ideal-int #53466

	    statement, or a possibly labeled <a href="#Fallthrough_statements">"fallthrough"
	    statement</a>.</li>
	</ul>
</li>

<li>
	A <a href="#Select_statements">"select" statement</a> in which:
	<ul>
	<li>there are no "break" statements referring to the "select" statement, and</li>
	<li>the statement lists in each case, including the default if present,
	    end in a terminating statement.</li>
	</ul>
</li>

pkg syscall (openbsd-386), const SYS_KILL = 37
pkg syscall (openbsd-386), const SYS_LSTAT = 293
pkg syscall (openbsd-386), const SYS_NANOSLEEP = 240
pkg syscall (openbsd-386), const SYS_SELECT = 93
pkg syscall (openbsd-386), const SYS_SETITIMER = 83
pkg syscall (openbsd-386), const SYS_SETTIMEOFDAY = 122
pkg syscall (openbsd-386), const SYS_STAT = 291
pkg syscall (openbsd-386), const SYS_STATFS = 307

</p>

<pre>
var limit = make(chan int, 3)

func main() {
	for _, w := range work {
		go func(w func()) {
			limit &lt;- 1
			w()
			&lt;-limit
		}(w)
	}
	select{}
}
</pre>

<h3 id="locks">Locks</h3>

<p>
The <code>sync</code> package implements two lock data types,
<code>sync.Mutex</code> and <code>sync.RWMutex</code>.
</p>

<p class="rule">

pkg debug/elf, type R_LARCH int #46229
pkg debug/pe, const IMAGE_COMDAT_SELECT_ANY = 2 #51868
pkg debug/pe, const IMAGE_COMDAT_SELECT_ANY ideal-int #51868
pkg debug/pe, const IMAGE_COMDAT_SELECT_ASSOCIATIVE = 5 #51868
pkg debug/pe, const IMAGE_COMDAT_SELECT_ASSOCIATIVE ideal-int #51868
pkg debug/pe, const IMAGE_COMDAT_SELECT_EXACT_MATCH = 4 #51868
pkg debug/pe, const IMAGE_COMDAT_SELECT_EXACT_MATCH ideal-int #51868