Initial contribution of loader_communication

ST-Ericsson ID: 326913
ST-Ericsson FOSS-OUT ID: STETL-FOSS-OUT-10204

Change-Id: I171cfc2ee458a8a0a91a1916137d131f0f7ecee5

1 files changed, 67 insertions, 0 deletions

diff --git a/source/api_wrappers/linux/CSemaphoreQueue.h b/source/api_wrappers/linux/CSemaphoreQueue.h
new file mode 100644
index 0000000..712d697
--- /dev/null
+++ b/source/api_wrappers/linux/CSemaphoreQueue.h
@@ -0,0 +1,67 @@
+/*******************************************************************************
+ * Copyright (C) ST-Ericsson SA 2011
+ * License terms: 3-clause BSD license
+ ******************************************************************************/
+
+#ifndef _CSEMAPHOREQUEUE_H
+#define _CSEMAPHOREQUEUE_H
+#include "Types.h"
+#include "CEventObject.h"
+#include "CSemaphore.h"
+#include "pthread.h"
+#include "CCriticalSection.h"
+#include "CWaitableObject.h"
+#include "CWaitableObjectCollection.h"
+
+class CSemaphore;
+
+enum RemoveResult {
+    REMOVE_SUCCESS,
+    REMOVE_TIMEOUT,
+    REMOVE_CANCEL
+};
+
+// An object queue implementation using WinAPI's Semaphore.
+// For multi-threaded multi-processor applications with multiple producers and multiple consumers
+class CSemaphoreQueue
+{
+public:
+    CSemaphoreQueue(unsigned int MaxCount);
+    ~CSemaphoreQueue();
+    bool AddTail(void *pObject);
+    RemoveResult RemoveHead(void **ppRequest, size_t mSecTimeout);
+    void SignalEvent();
+private:
+    CEventObject *m_pEventObject;
+    CSemaphore *m_pSemaphore;
+    CCriticalSectionObject m_CSLock;
+    void **m_Queue;
+    const unsigned int m_MaximumCount;
+    unsigned int m_CurrentCount;
+    unsigned int m_CurrentHead;
+    unsigned int m_CurrentTail;
+    void IncrementHead();
+    void IncrementTail();
+    void AddToQueueTail(void *pObject);
+    void *RemoveFromQueueHead();
+    unsigned int GetIndex(CWaitableObject *Object) const;
+    // Next 2 functions not really necessary - for error case only
+    void DecrementTail();
+    void RemoveFromQueueTail();
+    CWaitableObjectCollection m_ObjectCollection;
+};
+
+class CPollQueue : public CSemaphoreQueue
+{
+public:
+    CPollQueue() : CSemaphoreQueue(256) {}
+    RemoveResult RemovePollRequest(void **pTO, int mSecTimeout = INFINITE) {
+        return RemoveHead(pTO, mSecTimeout);
+    }
+    bool AddPollRequest(void *pObject) {
+        return AddTail(pObject);
+    }
+};
+
+#endif /* _CSEMAPHOREQUEUE_H */
+