1 files changed, 79 insertions, 0 deletions
diff --git a/src/include/atomic_queue.h b/src/include/atomic_queue.h
new file mode 100644
index 0000000..9fbcfe7
--- /dev/null
+++ b/src/include/atomic_queue.h
@@ -0,0 +1,79 @@
+#pragma once
+/*
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program 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 General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
+ */
+
+/**
+ * $Id$
+ *
+ * @file atomic_queue.h
+ * @brief Thread-safe queues.
+ *
+ * @copyright 2016 Alan DeKok (aland@freeradius.org)
+ */
+RCSIDH(atomic_queue_h, "$Id$")
+
+#ifdef HAVE_WDOCUMENTATION
+DIAG_OFF(documentation)
+#endif
+#include <talloc.h>
+#ifdef HAVE_WDOCUMENTATION
+DIAG_ON(documentation)
+#endif
+#include <stdbool.h>
+
+#ifdef HAVE_STDATOMIC_H
+#  include <stdatomic.h>
+#else
+#  include <freeradius-devel/stdatomic.h>
+#endif
+
+/*
+ *	Some macros to make our life easier.
+ */
+#define atomic_int64_t _Atomic(int64_t)
+#define atomic_uint32_t _Atomic(uint32_t)
+#define atomic_uint64_t _Atomic(uint64_t)
+
+#define cas_incr(_store, _var)    atomic_compare_exchange_strong_explicit(&_store, &_var, _var + 1, memory_order_release, memory_order_relaxed)
+#define cas_decr(_store, _var)    atomic_compare_exchange_strong_explicit(&_store, &_var, _var - 1, memory_order_release, memory_order_relaxed)
+#define load(_var)           atomic_load_explicit(&_var, memory_order_relaxed)
+#define aquire(_var)         atomic_load_explicit(&_var, memory_order_acquire)
+#define store(_store, _var)  atomic_store_explicit(&_store, _var, memory_order_release);
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+typedef struct fr_atomic_queue_s fr_atomic_queue_t;
+
+fr_atomic_queue_t	*fr_atomic_queue_alloc(TALLOC_CTX *ctx, size_t size);
+void			fr_atomic_queue_free(fr_atomic_queue_t **aq);
+bool			fr_atomic_queue_push(fr_atomic_queue_t *aq, void *data);
+bool			fr_atomic_queue_pop(fr_atomic_queue_t *aq, void **p_data);
+size_t			fr_atomic_queue_size(fr_atomic_queue_t *aq);
+
+#ifdef WITH_VERIFY_PTR
+void			fr_atomic_queue_verify(fr_atomic_queue_t *aq);
+#endif
+
+#ifndef NDEBUG
+void			fr_atomic_queue_debug(fr_atomic_queue_t *aq, FILE *fp);
+#endif
+
+
+#ifdef __cplusplus
+}
+#endif