118 lines
3.3 KiB
C
118 lines
3.3 KiB
C
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///////////////////////////////////////////////////////////////////////////////
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// Name: wx/os2/tls.h
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// Purpose: OS/2 implementation of wxTlsValue<>
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// Author: Stefan Neis
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// Created: 2008-08-30
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// Copyright: (c) 2008 Stefan Neis
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// Licence: wxWindows licence
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///////////////////////////////////////////////////////////////////////////////
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#ifndef _WX_OS2_TLS_H_
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#define _WX_OS2_TLS_H_
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#include "wx/os2/private.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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APIRET rc = ::DosAllocThreadLocalMemory(1, &m_slot);
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if (rc != NO_ERROR)
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m_slot = NULL;
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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 != NULL; }
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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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return (void *)m_slot;
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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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m_slot = (ULONG*)value;
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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 and OS/2 API doesn't have the equivalent of pthread's
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// destructor, so we have to keep track of all allocated values and
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// destroy them manually; ideally we'd do that at thread exit time, but
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// since we could only do that with wxThread and not otherwise created
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// threads, we do it 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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::DosFreeThreadLocalMemory(m_slot);
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}
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private:
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wxTlsDestructorFunction m_destructor;
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ULONG* 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_OS2_TLS_H_
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