go/misc/cgo/testtls/tls_unix.c

// Copyright 2013 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 <pthread.h>

static __thread int tls;

void
setTLS(int v)
{
	tls = v;
}

int
getTLS()
{
	return tls;
}
all: make copyright headers consistent with one space after period Follows suit with https://go-review.googlesource.com/#/c/20111. Generated by running $ grep -R 'Go Authors. All' * \| cut -d":" -f1 \| while read F;do perl -pi -e 's/Go Authors. All/Go Authors. All/g' $F;done The code in cmd/internal/unvendor wasn't changed. Fixes #15213 Change-Id: I4f235cee0a62ec435f9e8540a1ec08ae03b1a75f Reviewed-on: https://go-review.googlesource.com/21819 Reviewed-by: Ian Lance Taylor <iant@golang.org> Run-TryBot: Ian Lance Taylor <iant@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org> 2016-04-10 14:32:26 -07:00			`// Copyright 2013 The Go Authors. All rights reserved.`
cmd/ld: emit TLS relocations during external linking This CL was written by rsc. I just tweaked 8l. This CL adds TLS relocation to the ELF .o file we write during external linking, so that the host linker (gcc) can decide the final location of m and g. Similar relocations are not necessary on OS X because we use an alternate program start-time mechanism to acquire thread-local storage. Similar relocations are not necessary on ARM or Plan 9 or Windows because external linking mode is not yet supported on those systems. On almost all ELF systems, the references we use are like %fs:-0x4 or %gs:-0x4, which we write in 6a/8a as -0x4(FS) or -0x4(GS). On Linux/ELF, however, Xen's lack of support for this mode forced us long ago to use a two-instruction sequence: first we load %gs:0x0 into a register r, and then we use -0x4(r). (The ELF program loader arranges that %gs:0x0 contains a regular pointer to that same memory location.) In order to relocate those -0x4(r) references, the linker must know where they are. This CL adds the equivalent notation -0x4(r)(GS1) for this purpose: it assembles to the same encoding as -0x4(r) but the (GS1) indicates to the linker that this is one of those thread-local references that needs relocation. Thanks to Elias Naur for reminding me about this missing piece and also for writing the test. R=r CC=golang-dev https://golang.org/cl/7891047 2013-03-27 13:27:35 -07:00			`// Use of this source code is governed by a BSD-style`
			`// license that can be found in the LICENSE file.`

			`#include <pthread.h>`

			`static __thread int tls;`

			`void`
			`setTLS(int v)`
			`{`
			`tls = v;`
			`}`

			`int`
			`getTLS()`
			`{`
			`return tls;`
			`}`