Add enum spdk_thread_op and two function typedefs spdk_thread_op_fn
and spdk_thread_op_supported_fn.
The first operation type of enum spdk_thread_op is SPDK_THREAD_OP_NEW,
and it is used as an alternative to spdk_new_thread_fn.
Add global variables, g_thread_op_fn and g_thread_op_supported_fn, and
then add spdk_thread_lib_init_ext() to initialize these.
spdk_thread_lib_init() requires both of thread_op_fn and
thread_op_supported_fn are specified or not specified.
spdk_thread_create() calls g_thread_op_fn() with SPDK_THREAD_OP_NEW
if g_new_thread_fn is NULL, g_thread_op_supported_fn is not NULL,
and g_thread_op_supported_fn(SPDK_THREAD_OP_NEW) returns true.
Update unit test to test these addition.
Signed-off-by: Shuhei Matsumoto <shuhei.matsumoto.xt@hitachi.com>
Change-Id: I56db903f62437f6ff3198248ffc5dede396c22bc
Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/967
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Reviewed-by: Ben Walker <benjamin.walker@intel.com>
Reviewed-by: Jim Harris <james.r.harris@intel.com>
d82d69017f