• This is really a stop-gap.  The recent thread pool changes uncovered a 
    deeper issue with how we use librt.  We really should be probing for 
    timer_create and then conditionally enabling that code.
    
    Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
    
    
    
    git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5997 c046a42c-6fe2-441c-8c8c-71466251a162
    aliguori authored
     
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  • glibc implements posix-aio as a thread pool and imposes a number of limitations.
    
    1) it limits one request per-file descriptor.  we hack around this by dup()'ing
    file descriptors which is hideously ugly
    
    2) it's impossible to add new interfaces and we need a vectored read/write
    operation to properly support a zero-copy API.
    
    What has been suggested to me by glibc folks, is to implement whatever new
    interfaces we want and then it can eventually be proposed for standardization.
    This requires that we implement our own posix-aio implementation though.
    
    This patch implements posix-aio using pthreads.  It immediately eliminates the
    need for fd pooling.
    
    It performs at least as well as the current posix-aio code (in some
    circumstances, even better).
    
    Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
    
    
    
    git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5996 c046a42c-6fe2-441c-8c8c-71466251a162
    aliguori authored
     
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