summaryrefslogtreecommitdiffstats
path: root/src/include/atomic_queue.h
diff options
context:
space:
mode:
Diffstat (limited to '')
-rw-r--r--src/include/atomic_queue.h71
1 files changed, 71 insertions, 0 deletions
diff --git a/src/include/atomic_queue.h b/src/include/atomic_queue.h
new file mode 100644
index 0000000..7d9be91
--- /dev/null
+++ b/src/include/atomic_queue.h
@@ -0,0 +1,71 @@
+#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
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/*
+ * Some macros to make our life easier.
+ */
+#define atomic_uint32_t _Atomic(uint32_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);
+
+typedef struct fr_atomic_queue_t fr_atomic_queue_t;
+
+fr_atomic_queue_t *fr_atomic_queue_create(TALLOC_CTX *ctx, int size);
+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);
+
+#ifndef NDEBUG
+void fr_atomic_queue_debug(fr_atomic_queue_t *aq, FILE *fp);
+#endif
+
+
+#ifdef __cplusplus
+}
+#endif