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100 lines
2.2 KiB
C++
100 lines
2.2 KiB
C++
// Copyright (C) 2001-2003
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// William E. Kempf
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//
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// Permission to use, copy, modify, distribute and sell this software
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// and its documentation for any purpose is hereby granted without fee,
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// provided that the above copyright notice appear in all copies and
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// that both that copyright notice and this permission notice appear
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// in supporting documentation. William E. Kempf makes no representations
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// about the suitability of this software for any purpose.
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// It is provided "as is" without express or implied warranty.
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#include <boost/thread/detail/config.hpp>
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#ifndef BOOST_HAS_WINTHREADS
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#include <boost/detail/workaround.hpp>
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#include <boost/thread/once.hpp>
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#include <cstdio>
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#include <cassert>
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#if defined(BOOST_HAS_MPTASKS)
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# include <Multiprocessing.h>
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#endif
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#ifdef BOOST_NO_STDC_NAMESPACE
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namespace std { using ::sprintf; }
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#endif
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#if defined(BOOST_HAS_PTHREADS)
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namespace {
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pthread_key_t key;
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pthread_once_t once = PTHREAD_ONCE_INIT;
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typedef void (*once_callback)();
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}
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extern "C" {
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static void key_init()
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{
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pthread_key_create(&key, 0);
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}
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static void do_once()
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{
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once_callback* cb = reinterpret_cast<once_callback*>(
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pthread_getspecific(key));
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(**cb)();
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}
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}
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#elif defined(BOOST_HAS_MPTASKS)
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namespace {
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void *remote_call_proxy(void *pData)
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{
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std::pair<void (*)(), boost::once_flag *> &rData(
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*reinterpret_cast<std::pair<void (*)(), boost::once_flag *> *>(pData));
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if(*rData.second == false)
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{
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rData.first();
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*rData.second = true;
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}
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return(NULL);
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}
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}
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#endif
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namespace boost {
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void call_once(void (*func)(), once_flag& flag)
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{
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#if defined(BOOST_HAS_PTHREADS)
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pthread_once(&once, &key_init);
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pthread_setspecific(key, &func);
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pthread_once(&flag, do_once);
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#elif defined(BOOST_HAS_MPTASKS)
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if(flag == false)
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{
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// all we do here is make a remote call to blue, as blue is not
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// reentrant.
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std::pair<void (*)(), once_flag *> sData(func, &flag);
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MPRemoteCall(remote_call_proxy, &sData, kMPOwningProcessRemoteContext);
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assert(flag == true);
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}
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#endif
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}
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}
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#endif
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// Change Log:
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// 1 Aug 01 WEKEMPF Initial version.
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// 6 Sep 05 Anthony Williams. Removed win32 implementation
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