Add a new lock API: apr_global_mutex_t

This is analog to the APR_LOCKALL method of apr_lock_t, and provides
cross-process AND cross-thread mutual exclusion.

I have provided a simple test (based on testprocmutex.c) and stubs
for non-Unix platforms.


git-svn-id: https://svn.apache.org/repos/asf/apr/apr/trunk@63001 13f79535-47bb-0310-9956-ffa450edef68

2 files changed, 97 insertions, 1 deletions

diff --git a/locks/os2/Makefile.in b/locks/os2/Makefile.in
index 8d5515014..3d63592cf 100644
--- a/locks/os2/Makefile.in
+++ b/locks/os2/Makefile.in
@@ -3,7 +3,8 @@ TARGETS = locks.lo \
 	thread_mutex.lo \
 	thread_rwlock.lo \
 	thread_cond.lo \
-    proc_mutex.lo
+	proc_mutex.lo \
+	global_mutex.lo
 
 # bring in rules.mk for standard functionality
 @INCLUDE_RULES@
diff --git a/locks/os2/global_mutex.c b/locks/os2/global_mutex.c
new file mode 100644
index 000000000..879d2b289
--- /dev/null
+++ b/locks/os2/global_mutex.c
@@ -0,0 +1,95 @@
+/* ====================================================================
+ * The Apache Software License, Version 1.1
+ *
+ * Copyright (c) 2000-2001 The Apache Software Foundation.  All rights
+ * reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ *
+ * 3. The end-user documentation included with the redistribution,
+ *    if any, must include the following acknowledgment:
+ *       "This product includes software developed by the
+ *        Apache Software Foundation (http://www.apache.org/)."
+ *    Alternately, this acknowledgment may appear in the software itself,
+ *    if and wherever such third-party acknowledgments normally appear.
+ *
+ * 4. The names "Apache" and "Apache Software Foundation" must
+ *    not be used to endorse or promote products derived from this
+ *    software without prior written permission. For written
+ *    permission, please contact apache@apache.org.
+ *
+ * 5. Products derived from this software may not be called "Apache",
+ *    nor may "Apache" appear in their name, without prior written
+ *    permission of the Apache Software Foundation.
+ *
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
+ * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
+ * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
+ * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ * ====================================================================
+ *
+ * This software consists of voluntary contributions made by many
+ * individuals on behalf of the Apache Software Foundation.  For more
+ * information on the Apache Software Foundation, please see
+ * <http://www.apache.org/>.
+ */
+
+#include "apr.h"
+#include "apr_strings.h"
+
+APR_DECLARE(apr_status_t) apr_global_mutex_create(apr_global_mutex_t **mutex,
+                                                  const char *fname,
+                                                  apr_lockmech_e mech,
+                                                  apr_pool_t *pool)
+{
+    return APR_ENOTIMPL;
+}
+
+APR_DECLARE(apr_status_t) apr_global_mutex_child_init(
+                              apr_global_mutex_t **mutex,
+                              const char *fname,
+                              apr_pool_t *pool)
+{
+    return APR_ENOTIMPL;
+}
+
+APR_DECLARE(apr_status_t) apr_global_mutex_lock(apr_global_mutex_t *mutex)
+{
+    return APR_ENOTIMPL;
+}
+
+APR_DECLARE(apr_status_t) apr_global_mutex_trylock(apr_global_mutex_t *mutex)
+{
+    return APR_ENOTIMPL;
+}
+
+APR_DECLARE(apr_status_t) apr_global_mutex_unlock(apr_global_mutex_t *mutex)
+{
+    return APR_ENOTIMPL;
+}
+
+APR_DECLARE(apr_status_t) apr_global_mutex_destroy(apr_global_mutex_t *mutex)
+{
+    return APR_ENOTIMPL;
+}
+
+APR_POOL_IMPLEMENT_ACCESSOR(global_mutex);
+