From e874ef9b845424dceeac4211ca9dfec24949f03c Mon Sep 17 00:00:00 2001
From: Georgios Pinitas <georgios.pinitas@arm.com>
Date: Mon, 9 Sep 2019 17:40:33 +0100
Subject: COMPMID-2646: Wrap thread-related structure to ease bare-metal
 support

Wraps "lock_guard" and "unique_lock" to ease bare-metal support.
Adds basic armclang compilation flow.

Change-Id: I44ccd042652acd6a9b442c57c879db3891abb0e2
Signed-off-by: Georgios Pinitas <georgios.pinitas@arm.com>
Reviewed-on: https://review.mlplatform.org/c/1923
Tested-by: Arm Jenkins <bsgcomp@arm.com>
Reviewed-by: Pablo Marquez <pablo.tello@arm.com>
Comments-Addressed: Arm Jenkins <bsgcomp@arm.com>
---
 support/Mutex.h | 66 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 65 insertions(+), 1 deletion(-)

(limited to 'support/Mutex.h')

diff --git a/support/Mutex.h b/support/Mutex.h
index d70dd7595b..c398c570af 100644
--- a/support/Mutex.h
+++ b/support/Mutex.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2017-2018 ARM Limited.
+ * Copyright (c) 2017-2019 ARM Limited.
  *
  * SPDX-License-Identifier: MIT
  *
@@ -31,6 +31,14 @@ namespace arm_compute
 #ifndef NO_MULTI_THREADING
 /** Wrapper of Mutex data-object */
 using Mutex = std::mutex;
+
+/** Wrapper of lock_guard data-object */
+template <typename Mutex>
+using lock_guard = std::lock_guard<Mutex>;
+
+/** Wrapper of lock_guard data-object */
+template <typename Mutex>
+using unique_lock = std::unique_lock<Mutex>;
 #else  /* NO_MULTI_THREADING */
 /** Wrapper implementation of Mutex data-object */
 class Mutex
@@ -56,6 +64,62 @@ public:
         return true;
     }
 };
+
+/** Wrapper implementation of lock-guard data-object */
+template <typename Mutex>
+class lock_guard
+{
+public:
+    typedef Mutex mutex_type;
+
+public:
+    explicit lock_guard(Mutex &m_)
+        : m(m_)
+    {
+    }
+    ~lock_guard()
+    {
+    }
+    lock_guard(const lock_guard &) = delete;
+
+private:
+    mutex_type &m;
+};
+
+/** Wrapper implementation of unique-lock data-object */
+template <typename Mutex>
+class unique_lock
+{
+public:
+    typedef Mutex mutex_type;
+
+public:
+    unique_lock() noexcept : m(nullptr)
+    {
+    }
+    explicit unique_lock(mutex_type &m)
+        : m(&m)
+    {
+    }
+    unique_lock(const unique_lock &) = delete;
+    unique_lock(unique_lock &&)      = default;
+    unique_lock &operator=(const unique_lock &) = delete;
+    unique_lock &operator=(unique_lock &&) = default;
+    ~unique_lock()                         = default;
+    void lock()
+    {
+    }
+    bool try_lock()
+    {
+        return true;
+    }
+    void unlock()
+    {
+    }
+
+private:
+    mutex_type *m;
+};
 #endif /* NO_MULTI_THREADING */
 }
 #endif /* __ARM_COMPUTE_MUTEX_H__ */
-- 
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