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http://sourceware.org/ml/glibc-bugs/2008-11/msg00073.html
http://www.nabble.com/-Bug-nptl-7057--New:-pthread-rwlock-does-not-implement-'writer-preferred'-option-td20703744.html
pthread rwlock does not implement 'writer preferred' option
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pthread_rwlock_t rw_lock;
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{
pthread_rwlockattr_t attr;
int ret = 0;
ret = pthread_rwlockattr_init( &attr );
if( ret < 0 )
{
...;
return;
}
#ifdef HAVE_PTHREAD_RWLOCK_PREFER_WRITER_NP
pthread_rwlockattr_setkind_np(&attr, PTHREAD_RWLOCK_PREFER_WRITER_NP); // дÓÅÏÈ
#endif
ret = pthread_rwlockattr_setpshared( &attr, PTHREAD_PROCESS_SHARED ); // ½ø³ÌÄÚ
if( ret < 0 )
{
...;
return;
}
ret = pthread_rwlock_init( &rw_lock, &attr );
if( ret < 0 )
{
...;
return;
}
ret = pthread_rwlockattr_destroy( &attr );
if( ret < 0 )
{
...;
return;
}
return;
}
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// Ð´Ëø
pthread_rwlock_wrlock(&rw_lock);
......
pthread_rwlock_unlock(&rw_lock);
// ¶ÁËø
pthread_rwlock_rdlock(& w_lock);
......
pthread_rwlock_unlock(&rw_lock);
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