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copied!<p>The first argument to <a href="http://msdn.microsoft.com/en-us/library/windows/desktop/ms684326%28v=vs.85%29.aspx" rel="noreferrer"><code>OpenSemaphore()</code></a> is documented as:</p> <blockquote> <p>dwDesiredAccess [in]</p> <p>The access to the semaphore object. The function fails if the security descriptor of the specified object does not permit the requested access for the calling process. For a list of access rights, see Synchronization Object Security and Access Rights.</p> </blockquote> <p>In the posted code <code>NULL</code> is specified: which is not documented as having a special meaning. Change to one of the access rights documented at <a href="http://msdn.microsoft.com/en-us/library/windows/desktop/ms686670%28v=vs.85%29.aspx" rel="noreferrer">Synchronization Object Security and Access Rights</a>:</p> <pre><code>bitmapSem = OpenSemaphore(SYNCHRONIZE, TRUE, "Global\\bitmap"); </code></pre> <p>EDIT:</p> <p>To create a security descriptor that would grant access to <code>Everyone</code> try the following (untested) code:</p> <pre><code>/* Create a security descriptor that has an an empty DACL, to grant access to 'Everyone'. */ SECURITY_DESCRIPTOR sd; if (0 == InitializeSecurityDescriptor(&sd, SECURITY_DESCRIPTOR_REVISION) || 0 == SetSecurityDescriptorDacl(&sd, TRUE, (PACL)0, FALSE)) { /* Failed to create security descriptor. */ } else { SECURITY_ATTRIBUTES sa; sa.nLength = sizeof(sa); sa.lpSecurityDescriptor = &sd; sa.bInheritHandle = FALSE; HANDLE sh = CreateSemaphore(&sa, 1, 1, "Global\\bitmap"); } </code></pre>

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