From ff937c39febe63d52c55590d8e3bd3a460f26651 Mon Sep 17 00:00:00 2001
From: Werner Koch <wk@gnupg.org>
Date: Thu, 9 Jan 2014 19:14:09 +0100
Subject: Add gpgrt_lock_ functions.

* src/gpg-error.h.in (GPGRT_LOCK_DEFINE): New.
(gpgrt_lock_init): New.
(gpgrt_lock_lock): New.
(gpgrt_lock_unlock): New.
(gpgrt_lock_destroy): New.
(gpgrt_yield): New.
* src/gpg-error.def.in: Add new functions.
* m4/lock.m4, m4/threadlib.m4: New. Taken from current gnulib.
* configure.ac: Call gl_LOCK.  Check size of pthread_mutex_t. Add
LIBTHREAD to GPG_ERROR_CONFIG_LIBS.
* src/err-codes.h.in (GPG_ERR_INV_LOCK_OBJ): New.
* src/gen-posix-lock-obj.c: New.
* src/gen-w32-lock-obj.c: New.
* src/lock.h, src/thread.h: New.
* src/posix-lock-obj.h, src/w32-lock-obj.h: New.
* src/posix-lock.c, src/w32-lock.c: New.
* src/posix-thread.c, src/w32-thread.c:
* src/w32-lock-obj-pub.in: New.
* src/mkheader.c (include_file): Support build time include files.
(write_special): Add keyword "include:lock-obj".
* src/Makefile.am:
(posix-lock-obj-pub.in): New rule.
(noinst_PROGRAMS): Add gen-*-lock-obj helpers.

* tests/t-common.h: New.
* tests/t-lock.c: New.
* tests/Makefile.am (t_lock_LDADD): Add new test.

--

This patch introduces the gpgrt_ functions which will be extended over
time to provide a library of commonly used code in GnuPG and
Libgcrypt.  Having them in a library named libgpg-error is a misnomer
but this way we can achieve a smooth upgrade path.

In contrasts to other GnuPG libraries, the gpgrt_ functions return a
simple gpg_err_code_t and not gpg_error_t.  The rationale for this is
that a source of error identifier does not make sense here; it is
better to use the source of error identifier of the caller.  This can
easily be achieved in a component by wrapping these function in a
gpg_error macro/inline.

There is no cross-compiling support for Posix platforms; the
gen-posix-lock-obj tool must be run on the target system.

Note that the gen-w32-lock-obj tool is not needed at build time but
was used to figure out ABI definitions for Windows.

Signed-off-by: Werner Koch <wk@gnupg.org>
---
 src/posix-thread.c | 63 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 63 insertions(+)
 create mode 100644 src/posix-thread.c

(limited to 'src/posix-thread.c')

diff --git a/src/posix-thread.c b/src/posix-thread.c
new file mode 100644
index 0000000..a739e40
--- /dev/null
+++ b/src/posix-thread.c
@@ -0,0 +1,63 @@
+/* posix-thread.c - GPGRT thread functions for POSIX systems
+   Copyright (C) 2014 g10 Code GmbH
+
+   This file is part of libgpg-error.
+
+   libgpg-error is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public License
+   as published by the Free Software Foundation; either version 2.1 of
+   the License, or (at your option) any later version.
+
+   libgpg-error is distributed in the hope that it will be useful, but
+   WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#if HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#ifdef HAVE_W32_SYSTEM
+# error This module may not be build for Windows.
+#endif
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <errno.h>
+#include <unistd.h>  /* Get posix option macros.  */
+
+#if USE_POSIX_THREADS
+# ifdef _POSIX_PRIORITY_SCHEDULING
+#  include <sched.h>
+# endif
+#elif USE_SOLARIS_THREADS
+# include <thread.h>
+#endif
+
+#include "gpg-error.h"
+
+#include "thread.h"
+
+
+gpg_err_code_t
+gpgrt_yield (void)
+{
+#if USE_POSIX_THREADS
+# ifdef _POSIX_PRIORITY_SCHEDULING
+   sched_yield ();
+# else
+   return GPG_ERR_NOT_SUPPORTED;
+# endif
+#elif USE_SOLARIS_THREADS
+  thr_yield ();
+#else
+  return GPG_ERR_NOT_SUPPORTED;
+#endif
+
+  return 0;
+}
-- 
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