124 lines
3.6 KiB
C
124 lines
3.6 KiB
C
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///////////////////////////////////////////////////////////////////////////////
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// Name: wx/msw/tls.h
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// Purpose: Win32 implementation of wxTlsValue<>
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// Author: Vadim Zeitlin
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// Created: 2008-08-08
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// Copyright: (c) 2008 Vadim Zeitlin <vadim@wxwidgets.org>
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// Licence: wxWindows licence
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///////////////////////////////////////////////////////////////////////////////
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#ifndef _WX_MSW_TLS_H_
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#define _WX_MSW_TLS_H_
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#include "wx/msw/wrapwin.h"
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#include "wx/thread.h"
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#include "wx/vector.h"
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// ----------------------------------------------------------------------------
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// wxTlsKey is a helper class encapsulating a TLS slot
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// ----------------------------------------------------------------------------
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class wxTlsKey
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{
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public:
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// ctor allocates a new key
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wxTlsKey(wxTlsDestructorFunction destructor)
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{
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m_destructor = destructor;
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m_slot = ::TlsAlloc();
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}
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// return true if the key was successfully allocated
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bool IsOk() const { return m_slot != TLS_OUT_OF_INDEXES; }
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// get the key value, there is no error return
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void *Get() const
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{
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// Exceptionally, TlsGetValue() calls SetLastError() even on success
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// which means it overwrites the previous value. This is undesirable
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// here, so explicitly preserve the last error here.
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const DWORD dwLastError = ::GetLastError();
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void* const value = ::TlsGetValue(m_slot);
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if ( dwLastError )
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::SetLastError(dwLastError);
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return value;
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}
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// change the key value, return true if ok
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bool Set(void *value)
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{
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void *old = Get();
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if ( ::TlsSetValue(m_slot, value) == 0 )
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return false;
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if ( old )
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m_destructor(old);
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// update m_allValues list of all values - remove old, add new
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wxCriticalSectionLocker lock(m_csAllValues);
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if ( old )
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{
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for ( wxVector<void*>::iterator i = m_allValues.begin();
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i != m_allValues.end();
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++i )
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{
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if ( *i == old )
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{
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if ( value )
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*i = value;
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else
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m_allValues.erase(i);
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return true;
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}
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}
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wxFAIL_MSG( "previous wxTlsKey value not recorded in m_allValues" );
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}
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if ( value )
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m_allValues.push_back(value);
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return true;
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}
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// free the key
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~wxTlsKey()
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{
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if ( !IsOk() )
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return;
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// Win32 API doesn't have the equivalent of pthread's destructor, so we
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// have to keep track of all allocated values and destroy them manually;
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// ideally we'd do that at thread exit time, but since we could only
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// do that with wxThread and not otherwise created threads, we do it
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// here.
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//
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// TODO: We should still call destructors for wxTlsKey used in the
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// thread from wxThread's thread shutdown code, *in addition*
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// to doing it in ~wxTlsKey.
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//
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// NB: No need to lock m_csAllValues, by the time this code is called,
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// no other thread can be using this key.
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for ( wxVector<void*>::iterator i = m_allValues.begin();
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i != m_allValues.end();
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++i )
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{
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m_destructor(*i);
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}
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::TlsFree(m_slot);
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}
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private:
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wxTlsDestructorFunction m_destructor;
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DWORD m_slot;
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wxVector<void*> m_allValues;
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wxCriticalSection m_csAllValues;
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wxDECLARE_NO_COPY_CLASS(wxTlsKey);
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};
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#endif // _WX_MSW_TLS_H_
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