Merge r1841078 from trunk:

Add in Atomics for 64bit ints

Reviewed by: jim


git-svn-id: https://svn.apache.org/repos/asf/apr/apr/branches/1.7.x@1841109 13f79535-47bb-0310-9956-ffa450edef68

3 files changed, 335 insertions, 0 deletions

diff --git a/atomic/unix/builtins64.c b/atomic/unix/builtins64.c
new file mode 100644
index 000000000..4a4b685c7
--- /dev/null
+++ b/atomic/unix/builtins64.c
@@ -0,0 +1,64 @@
+/* Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "apr_arch_atomic.h"
+
+#ifdef USE_ATOMICS_BUILTINS
+
+APR_DECLARE(apr_uint64_t) apr_atomic_read64(volatile apr_uint64_t *mem)
+{
+    return *mem;
+}
+
+APR_DECLARE(void) apr_atomic_set64(volatile apr_uint64_t *mem, apr_uint64_t val)
+{
+    *mem = val;
+}
+
+APR_DECLARE(apr_uint64_t) apr_atomic_add64(volatile apr_uint64_t *mem, apr_uint64_t val)
+{
+    return __sync_fetch_and_add(mem, val);
+}
+
+APR_DECLARE(void) apr_atomic_sub64(volatile apr_uint64_t *mem, apr_uint64_t val)
+{
+    __sync_fetch_and_sub(mem, val);
+}
+
+APR_DECLARE(apr_uint64_t) apr_atomic_inc64(volatile apr_uint64_t *mem)
+{
+    return __sync_fetch_and_add(mem, 1);
+}
+
+APR_DECLARE(int) apr_atomic_dec64(volatile apr_uint64_t *mem)
+{
+    return __sync_sub_and_fetch(mem, 1);
+}
+
+APR_DECLARE(apr_uint64_t) apr_atomic_cas64(volatile apr_uint64_t *mem, apr_uint64_t with,
+                                           apr_uint64_t cmp)
+{
+    return __sync_val_compare_and_swap(mem, cmp, with);
+}
+
+APR_DECLARE(apr_uint64_t) apr_atomic_xchg64(volatile apr_uint64_t *mem, apr_uint64_t val)
+{
+    __sync_synchronize();
+
+    return __sync_lock_test_and_set(mem, val);
+}
+
+#endif /* USE_ATOMICS_BUILTINS */
diff --git a/atomic/unix/mutex64.c b/atomic/unix/mutex64.c
new file mode 100644
index 000000000..10452413b
--- /dev/null
+++ b/atomic/unix/mutex64.c
@@ -0,0 +1,177 @@
+/* Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "apr_arch_atomic.h"
+
+#if defined(USE_ATOMICS_GENERIC) || defined (NEED_ATOMICS_GENERIC64)
+
+#include <stdlib.h>
+
+#if APR_HAS_THREADS
+#   define DECLARE_MUTEX_LOCKED(name, mem)  \
+        apr_thread_mutex_t *name = mutex_hash(mem)
+#   define MUTEX_UNLOCK(name)                                   \
+        do {                                                    \
+            if (apr_thread_mutex_unlock(name) != APR_SUCCESS)   \
+                abort();                                        \
+        } while (0)
+#else
+#   define DECLARE_MUTEX_LOCKED(name, mem)
+#   define MUTEX_UNLOCK(name)
+#   warning Be warned: using stubs for all atomic operations
+#endif
+
+#if APR_HAS_THREADS
+
+static apr_thread_mutex_t **hash_mutex;
+
+#define NUM_ATOMIC_HASH 7
+/* shift by 2 to get rid of alignment issues */
+#define ATOMIC_HASH(x) (unsigned int)(((unsigned long)(x)>>2)%(unsigned int)NUM_ATOMIC_HASH)
+
+static apr_status_t atomic_cleanup(void *data)
+{
+    if (hash_mutex == data)
+        hash_mutex = NULL;
+
+    return APR_SUCCESS;
+}
+
+APR_DECLARE(apr_status_t) apr_atomic_init(apr_pool_t *p)
+{
+    int i;
+    apr_status_t rv;
+
+    if (hash_mutex != NULL)
+        return APR_SUCCESS;
+
+    hash_mutex = apr_palloc(p, sizeof(apr_thread_mutex_t*) * NUM_ATOMIC_HASH);
+    apr_pool_cleanup_register(p, hash_mutex, atomic_cleanup,
+                              apr_pool_cleanup_null);
+
+    for (i = 0; i < NUM_ATOMIC_HASH; i++) {
+        rv = apr_thread_mutex_create(&(hash_mutex[i]),
+                                     APR_THREAD_MUTEX_DEFAULT, p);
+        if (rv != APR_SUCCESS) {
+           return rv;
+        }
+    }
+
+    return APR_SUCCESS;
+}
+
+static APR_INLINE apr_thread_mutex_t *mutex_hash(volatile apr_uint64_t *mem)
+{
+    apr_thread_mutex_t *mutex = hash_mutex[ATOMIC_HASH(mem)];
+
+    if (apr_thread_mutex_lock(mutex) != APR_SUCCESS) {
+        abort();
+    }
+
+    return mutex;
+}
+
+#else
+
+APR_DECLARE(apr_status_t) apr_atomic_init(apr_pool_t *p)
+{
+    return APR_SUCCESS;
+}
+
+#endif /* APR_HAS_THREADS */
+
+APR_DECLARE(apr_uint64_t) apr_atomic_read64(volatile apr_uint64_t *mem)
+{
+    return *mem;
+}
+
+APR_DECLARE(void) apr_atomic_set64(volatile apr_uint64_t *mem, apr_uint64_t val)
+{
+    DECLARE_MUTEX_LOCKED(mutex, mem);
+
+    *mem = val;
+
+    MUTEX_UNLOCK(mutex);
+}
+
+APR_DECLARE(apr_uint64_t) apr_atomic_add64(volatile apr_uint64_t *mem, apr_uint64_t val)
+{
+    apr_uint64_t old_value;
+    DECLARE_MUTEX_LOCKED(mutex, mem);
+
+    old_value = *mem;
+    *mem += val;
+
+    MUTEX_UNLOCK(mutex);
+
+    return old_value;
+}
+
+APR_DECLARE(void) apr_atomic_sub64(volatile apr_uint64_t *mem, apr_uint64_t val)
+{
+    DECLARE_MUTEX_LOCKED(mutex, mem);
+    *mem -= val;
+    MUTEX_UNLOCK(mutex);
+}
+
+APR_DECLARE(apr_uint64_t) apr_atomic_inc64(volatile apr_uint64_t *mem)
+{
+    return apr_atomic_add64(mem, 1);
+}
+
+APR_DECLARE(int) apr_atomic_dec64(volatile apr_uint64_t *mem)
+{
+    apr_uint64_t new;
+    DECLARE_MUTEX_LOCKED(mutex, mem);
+
+    (*mem)--;
+    new = *mem;
+
+    MUTEX_UNLOCK(mutex);
+
+    return new;
+}
+
+APR_DECLARE(apr_uint64_t) apr_atomic_cas64(volatile apr_uint64_t *mem, apr_uint64_t with,
+                              apr_uint64_t cmp)
+{
+    apr_uint64_t prev;
+    DECLARE_MUTEX_LOCKED(mutex, mem);
+
+    prev = *mem;
+    if (prev == cmp) {
+        *mem = with;
+    }
+
+    MUTEX_UNLOCK(mutex);
+
+    return prev;
+}
+
+APR_DECLARE(apr_uint64_t) apr_atomic_xchg64(volatile apr_uint64_t *mem, apr_uint64_t val)
+{
+    apr_uint64_t prev;
+    DECLARE_MUTEX_LOCKED(mutex, mem);
+
+    prev = *mem;
+    *mem = val;
+
+    MUTEX_UNLOCK(mutex);
+
+    return prev;
+}
+
+#endif /* USE_ATOMICS_GENERIC64 */
diff --git a/atomic/win32/apr_atomic64.c b/atomic/win32/apr_atomic64.c
new file mode 100644
index 000000000..a5acc945e
--- /dev/null
+++ b/atomic/win32/apr_atomic64.c
@@ -0,0 +1,94 @@
+/* Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "apr.h"
+#include "apr_atomic.h"
+#include "apr_thread_mutex.h"
+
+APR_DECLARE(apr_uint64_t) apr_atomic_add64(volatile apr_uint64_t *mem, apr_uint64_t val)
+{
+#if (defined(_M_IA64) || defined(_M_AMD64))
+    return InterlockedExchangeAdd64(mem, val);
+#else
+    return InterlockedExchangeAdd64((long *)mem, val);
+#endif
+}
+
+/* Of course we want the 2's compliment of the unsigned value, val */
+#ifdef _MSC_VER
+#pragma warning(disable: 4146)
+#endif
+
+APR_DECLARE(void) apr_atomic_sub64(volatile apr_uint64_t *mem, apr_uint64_t val)
+{
+#if (defined(_M_IA64) || defined(_M_AMD64))
+    InterlockedExchangeAdd64(mem, -val);
+#else
+    InterlockedExchangeAdd64((long *)mem, -val);
+#endif
+}
+
+APR_DECLARE(apr_uint64_t) apr_atomic_inc64(volatile apr_uint64_t *mem)
+{
+    /* we return old value, win64 returns new value :( */
+#if (defined(_M_IA64) || defined(_M_AMD64)) && !defined(RC_INVOKED)
+    return InterlockedIncrement64(mem) - 1;
+#else
+    return InterlockedIncrement64((long *)mem) - 1;
+#endif
+}
+
+APR_DECLARE(int) apr_atomic_dec64(volatile apr_uint64_t *mem)
+{
+#if (defined(_M_IA64) || defined(_M_AMD64)) && !defined(RC_INVOKED)
+    return InterlockedDecrement64(mem);
+#else
+    return InterlockedDecrement64((long *)mem);
+#endif
+}
+
+APR_DECLARE(void) apr_atomic_set64(volatile apr_uint64_t *mem, apr_uint64_t val)
+{
+#if (defined(_M_IA64) || defined(_M_AMD64)) && !defined(RC_INVOKED)
+    InterlockedExchange64(mem, val);
+#else
+    InterlockedExchange64((long*)mem, val);
+#endif
+}
+
+APR_DECLARE(apr_uint64_t) apr_atomic_read64(volatile apr_uint64_t *mem)
+{
+    return *mem;
+}
+
+APR_DECLARE(apr_uint64_t) apr_atomic_cas64(volatile apr_uint64_t *mem, apr_uint64_t with,
+                                           apr_uint64_t cmp)
+{
+#if (defined(_M_IA64) || defined(_M_AMD64)) && !defined(RC_INVOKED)
+    return InterlockedCompareExchange64(mem, with, cmp);
+#else
+    return InterlockedCompareExchange64((long*)mem, with, cmp);
+#endif
+}
+
+APR_DECLARE(apr_uint64_t) apr_atomic_xchg64(volatile apr_uint64_t *mem, apr_uint64_t val)
+{
+#if (defined(_M_IA64) || defined(_M_AMD64)) && !defined(RC_INVOKED)
+    return InterlockedExchange64(mem, val);
+#else
+    return InterlockedExchange64((long *)mem, val);
+#endif
+}