core: Use gpgrt locking for thread safeness

* configure.ac: Require libgpg-error 1.17. No longer
check for pthread.
* doc/gpgme.texi: Document removed neccessity for thread
safe gpgme flavours.
* src/sema.h (DEFINE_GLOBAL_LOCK),
(DEFINE_STATIC_LOCK, INIT_LOCK, DECLARE_LOCK)
(DESTROY_LOCK, LOCK, UNLOCK): Change to gpgrt equivalents.
* src/posix-sema.c, src/w32-sema.c: Removed.
* src/Makefile.am: Remove libpthread and
Update accordingly.
* src/ath.c, src/ath.h (ath_mutex_init)
(ath_mutex_destroy, ath_mutex_lock, ath_mutex_unlock): Removed.
* src/ath.h (ATH_MUTEX_INITIALIZER): Removed.
* src/version.c (do_subsystem_inits): sema_subsystem_init is
no longer required.
* tests/gpg/Makefile.am: Add new threading tests.
(t_thread1_LDADD, t_cancel_LDADD):
Use just gpgme.
* tests/gpg/t-thread-keylist-verify.c,
tests/gpg/t-thread-keylist.c: New.
* src/gpgme-config.in: Use -lgpgme for thread-model pthread.

--
Using gpgrt locks instead of pthread locks removes
the neccessity to link pthread directly to gpgme and
have a different, thread safe flavor of gpgme. Now
gpgme is thread-safe if the conditions mentioned
in the doc are met.

As the cpp bindings linked against libgpgme
and not libgpgme-pthread this fixes threading problems
with them.

libgpgme-pthread is removed but gpgme-config still supports
--thread=pthread for compatibility with find scripts.

1 files changed, 76 insertions, 0 deletions

diff --git a/tests/gpg/t-thread-keylist.c b/tests/gpg/t-thread-keylist.c
new file mode 100644
index 00000000..14f7718b
--- /dev/null
+++ b/tests/gpg/t-thread-keylist.c
@@ -0,0 +1,76 @@
+/* t-thread-verify.c - Regression test.
+   Copyright (C) 2015 Intevation GmbH
+
+   This file is part of GPGME.
+
+   GPGME 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.
+
+   GPGME 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, write to the Free Software
+   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
+   02111-1307, USA.  */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+
+#include <gpgme.h>
+
+#include <pthread.h>
+
+#include "t-support.h"
+
+#define THREAD_COUNT 500
+
+void *
+start_keylist (void *arg)
+{
+  gpgme_error_t err;
+  gpgme_ctx_t ctx;
+  gpgme_key_t key;
+
+  err = gpgme_new (&ctx);
+  fail_if_err (err);
+
+  err = gpgme_op_keylist_start (ctx, NULL, 0);
+  fail_if_err (err);
+
+  while (!(err = gpgme_op_keylist_next (ctx, &key)));
+
+  return NULL;
+}
+
+int
+main (int argc, char *argv[])
+{
+  int i;
+  pthread_t keylist_threads[THREAD_COUNT];
+  init_gpgme (GPGME_PROTOCOL_OpenPGP);
+
+  for (i = 0; i < THREAD_COUNT; i++)
+    {
+      if (pthread_create(&keylist_threads[i], NULL, start_keylist, NULL))
+        {
+          fprintf(stderr, "%s:%i: failed to create threads \n",
+                       __FILE__, __LINE__);
+          exit(1);
+        }
+   }
+  for (i = 0; i < THREAD_COUNT; i++)
+    {
+      pthread_join (keylist_threads[i], NULL);
+    }
+  return 0;
+}