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.

3 files changed, 211 insertions, 3 deletions

diff --git a/tests/gpg/Makefile.am b/tests/gpg/Makefile.am
index 2538f631..dd33b0a2 100644
--- a/tests/gpg/Makefile.am
+++ b/tests/gpg/Makefile.am
@@ -38,7 +38,8 @@ c_tests = \
         t-encrypt t-encrypt-sym t-encrypt-sign t-sign t-signers		\
 	t-decrypt t-verify t-decrypt-verify t-sig-notation t-export	\
 	t-import t-trustlist t-edit t-keylist t-keylist-sig t-wait	\
-	t-encrypt-large t-file-name t-gpgconf t-encrypt-mixed $(tests_unix)
+	t-encrypt-large t-file-name t-gpgconf t-encrypt-mixed $(tests_unix) \
+	t-thread-keylist t-thread-keylist-verify
 
 TESTS = initial.test $(c_tests) final.test
 
@@ -61,8 +62,10 @@ EXTRA_DIST = initial.test final.test \
 AM_CPPFLAGS = -I$(top_builddir)/src @GPG_ERROR_CFLAGS@
 AM_LDFLAGS = -no-install
 LDADD = ../../src/libgpgme.la
-t_thread1_LDADD = ../../src/libgpgme-pthread.la -lpthread
-t_cancel_LDADD = ../../src/libgpgme-pthread.la -lpthread
+t_thread1_LDADD = ../../src/libgpgme.la -lpthread
+t_thread_keylist_LDADD = ../../src/libgpgme.la -lpthread
+t_thread_keylist_verify_LDADD = ../../src/libgpgme.la -lpthread
+t_cancel_LDADD = ../../src/libgpgme.la -lpthread
 
 # We don't run t-genkey and t-cancel in the test suite, because it
 # takes too long
diff --git a/tests/gpg/t-thread-keylist-verify.c b/tests/gpg/t-thread-keylist-verify.c
new file mode 100644
index 00000000..55af88a1
--- /dev/null
+++ b/tests/gpg/t-thread-keylist-verify.c
@@ -0,0 +1,129 @@
+/* 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
+
+static const char test_text1[] = "Just GNU it!\n";
+static const char test_sig1[] =
+"-----BEGIN PGP SIGNATURE-----\n"
+"\n"
+"iN0EABECAJ0FAjoS+i9FFIAAAAAAAwA5YmFyw7bDpMO8w58gZGFzIHdhcmVuIFVt\n"
+"bGF1dGUgdW5kIGpldHp0IGVpbiBwcm96ZW50JS1aZWljaGVuNRSAAAAAAAgAJGZv\n"
+"b2Jhci4xdGhpcyBpcyBhIG5vdGF0aW9uIGRhdGEgd2l0aCAyIGxpbmVzGhpodHRw\n"
+"Oi8vd3d3Lmd1Lm9yZy9wb2xpY3kvAAoJEC1yfMdoaXc0JBIAoIiLlUsvpMDOyGEc\n"
+"dADGKXF/Hcb+AKCJWPphZCphduxSvrzH0hgzHdeQaA==\n"
+"=nts1\n"
+"-----END PGP SIGNATURE-----\n";
+
+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;
+}
+
+void *
+start_verify (void *arg)
+{
+  gpgme_ctx_t ctx;
+  gpgme_error_t err;
+  gpgme_data_t sig, text;
+  gpgme_verify_result_t result;
+  gpgme_signature_t signature;
+
+  err = gpgme_new (&ctx);
+  fail_if_err (err);
+
+  /* Checking a valid message.  */
+  err = gpgme_data_new_from_mem (&text, test_text1, strlen (test_text1), 0);
+  fail_if_err (err);
+  err = gpgme_data_new_from_mem (&sig, test_sig1, strlen (test_sig1), 0);
+  fail_if_err (err);
+  err = gpgme_op_verify (ctx, sig, text, NULL);
+  fail_if_err (err);
+  result = gpgme_op_verify_result (ctx);
+
+  signature = result->signatures;
+
+  if (strcmp (signature->fpr, "A0FF4590BB6122EDEF6E3C542D727CC768697734"))
+    {
+      fprintf (stderr, "%s:%i: Unexpected fingerprint: %s\n",
+               __FILE__, __LINE__, signature->fpr);
+      exit (1);
+    }
+  if (gpgme_err_code (signature->status) != GPG_ERR_NO_ERROR)
+    {
+      fprintf (stderr, "%s:%i: Unexpected signature status: %s\n",
+               __FILE__, __LINE__, gpgme_strerror (signature->status));
+      exit (1);
+    }
+  return NULL;
+}
+
+int
+main (int argc, char *argv[])
+{
+  int i;
+  pthread_t verify_threads[THREAD_COUNT];
+  pthread_t keylist_threads[THREAD_COUNT];
+  init_gpgme (GPGME_PROTOCOL_OpenPGP);
+
+  for (i = 0; i < THREAD_COUNT; i++)
+    {
+      if (pthread_create(&verify_threads[i], NULL, start_verify, NULL) ||
+          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 (verify_threads[i], NULL);
+      pthread_join (keylist_threads[i], NULL);
+    }
+  return 0;
+}
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;
+}