public static PosixSemaphore Open(string name)
{
IntPtr semPtr = sem_open(name, (int)OpenFlags.O_CREAT, //TODO: fix OFlag
(uint)(FilePermissions.S_IRUSR | FilePermissions.S_IWUSR), 0);
if (semPtr == IntPtr.Zero)
{
throw new Exception($"Open PosixSemaphore failed. error = {Marshal.GetLastWin32Error()}");
}
var ps = new PosixSemaphore();
ps.name = name;
ps.sem = semPtr;
ps.own = false;
return(ps);
}
/// <summary>
/// Attempts to create the <see cref="EventWaitHandle"/> handles and initialise the node header and buffers.
/// </summary>
/// <returns>True if the events and nodes were initialised successfully.</returns>
protected override bool DoOpen()
{
// Create signal events
#if Linux
if (IsOwnerOfSharedMemory)
{
DataExists = PosixSemaphore.Create(Name + "_evt_dataexists");
NodeAvailable = PosixSemaphore.Create(Name + "_evt_nodeavail");
}
else
{
DataExists = PosixSemaphore.Open(Name + "_evt_dataexists");
NodeAvailable = PosixSemaphore.Open(Name + "_evt_nodeavail");
}
#else
DataExists = new EventWaitHandle(false, EventResetMode.AutoReset, Name + "_evt_dataexists");
NodeAvailable = new EventWaitHandle(false, EventResetMode.AutoReset, Name + "_evt_nodeavail");
#endif
if (IsOwnerOfSharedMemory)
{
// Retrieve pointer to node header
_nodeHeader = (NodeHeader *)(BufferStartPtr + NodeHeaderOffset);
// Initialise the node header
InitialiseNodeHeader();
// Initialise nodes entries
InitialiseLinkedListNodes();
}
else
{
// Load the NodeHeader
_nodeHeader = (NodeHeader *)(BufferStartPtr + NodeHeaderOffset);
NodeCount = _nodeHeader->NodeCount;
NodeBufferSize = _nodeHeader->NodeBufferSize;
}
return(true);
}