hupstoot draad samesteller fout met GCC
-
05-07-2019 - |
Vra
op linux, gcc 4,3, die opstel van 'n klas met hupstoot :: draad implementering en mutexes / toestand veranderlikes Ek kry die volgende vreemde fout, blykbaar as gevolg van konflik met die POSIX draad biblioteek tik:
*Compiling: filter.cpp
/usr/include/boost/thread/condition.hpp: In member function »void boost::condition::wait(L&) [with L = boost::mutex]«:
/host/.../filter.cpp:68: instantiated from here
/usr/include/boost/thread/condition.hpp:90: Error: no match für »operator!« in »!lock«*
*/usr/include/boost/thread/condition.hpp:90: Notice: candidates are: operator!(bool) <built in>*
*/usr/include/boost/thread/mutex.hpp:66: Error: »pthread_mutex_t boost::mutex::m_mutex« is private
/usr/include/boost/thread/condition.hpp:93: Error: in this context*
Die kode is:
void CFilter::process( CData **s )
{
boost::mutex::scoped_lock bufferLock(m_mutex);
while (!m_bStop)
m_change.wait(bufferLock); //<- line 68
// ... further processing
}
met die klas verklaring
#include <boost/shared_ptr.hpp>
#include <boost/bind.hpp>
#include <boost/thread/condition.hpp>
#include <boost/thread/thread.hpp>
#include <boost/thread/mutex.hpp>
class CFilter
{
// ...
boost::shared_ptr<boost::thread> m_thread;
boost::mutex m_mutex;
boost::condition m_change;
// ...
process( CData **s );
}
Die operateur fout vind plaas in condition.hpp hupstoot se in
if (!lock)
throw lock_error();
Ek gebruik Boost 1.38.0, op Windows Ek het nie probleme te vind. Enige hulp sal waardeer word!
Oplossing
Jy moet wag op die bufferLock
, nie m_mutex
:
while (!m_bStop)
m_change.wait(bufferLock);
Toestand <> :: wag () 'n> neem 'n ScopedLock
as parameter, nie 'n Mutex
.
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