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Gleb Natapov d7375ec102 Fix deadlock reported by Andrew Friedley:
What's happening is that we're holding openib_btl->eager_rdma_lock when
we call mca_btl_openib_endpoint_send_eager_rdma() on
btl_openib_endpoint.c:1227.  This in turn calls
mca_btl_openib_endpoint_send() on line 1179.  Then, if the endpoint
state isn't MCA_BTL_IB_CONNECTED or MCA_BTL_IB_FAILED, we call
opal_progress(), where we eventually try to lock
openib_btl->eager_rdma_lock at btl_openib_component.c:997.

The fix removes this lock altogether. Instead we atomically set local RDMA
pointer to prevent other threads to create rdma buffer for the same endpoint.
And we increment eager_rdma_buffers_count atomically thus polling thread doesn't
need lock around it.

This commit was SVN r12369.
2006-10-31 09:54:52 +00:00
..
2006-10-30 19:50:09 +00:00
2006-10-30 22:44:23 +00:00

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