Phase 1 of deprecating liburcu-signal
The first phase of liburcu-signal deprecation consists of implementing
it in term of liburcu-mb. In other words, liburcu-signal is identical to
liburcu-mb at the exception of the function symbols and public header
files.
This is done by:
1) Removing the RCU_SIGNAL specific code in urcu.c
2) Making the RCU_MB specific code also specific to RCU_SIGNAL in
urcu.c
3) Rewriting _urcu_signal_read_unlock_update_and_wakeup to use a
atomic store with CMM_SEQ_CST instead of a store CMM_RELAXED with
cmm_barrier() around it. We could keep the explicit barriers, but that
would require to add some cmm_annotate annotations. Therefore, to be
less intrusive in a public header file, simply use the CMM_SEQ_CST
like for the mb flavor.
Change-Id: Ie406f7df2f47da0a9f464df94b968ad9204821f3
Signed-off-by: Olivier Dion <odion@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
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