thread: Add spdk_thread_lib_init and fini

These don't do anything yet.

Change-Id: I718c6fb19c059a39bc5cb360c3da47ec05bfa416
Signed-off-by: Ben Walker <benjamin.walker@intel.com>
Reviewed-on: https://review.gerrithub.io/423767
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Chandler-Test-Pool: SPDK Automated Test System <sys_sgsw@intel.com>
Reviewed-by: Changpeng Liu <changpeng.liu@intel.com>
Reviewed-by: Shuhei Matsumoto <shuhei.matsumoto.xt@hitachi.com>
Reviewed-by: Jim Harris <james.r.harris@intel.com>

include/spdk/thread.h

@@ -162,6 +162,18 @@ struct spdk_io_channel {
 	 */
 };
 
+/**
+ * Initialize the threading library. Must be called once prior to allocating any threads.
+ *
+ * \return 0 on success. Negated errno on failure.
+ */
+int spdk_thread_lib_init(void);
+
+/**
+ * Release all resources associated with this library.
+ */
+void spdk_thread_lib_fini(void);
+
 /**
  * Initializes the calling thread for I/O channel allocation.
  *

lib/event/app.c

@@ -38,6 +38,7 @@
 #include "spdk/env.h"
 #include "spdk/log.h"
 #include "spdk/conf.h"
+#include "spdk/thread.h"
 #include "spdk/trace.h"
 #include "spdk/string.h"
 #include "spdk/rpc.h"
@@ -592,6 +593,8 @@ spdk_app_start(struct spdk_app_opts *opts, spdk_event_fn start_fn,
 
 	SPDK_NOTICELOG("Total cores available: %d\n", spdk_env_get_core_count());
 
+	spdk_thread_lib_init();
+
 	/*
 	 * If mask not specified on command line or in configuration file,
 	 *  reactor_mask will be 0x1 which will enable core 0 to run one
@@ -657,6 +660,7 @@ spdk_app_fini(void)
 	spdk_reactors_fini();
 	spdk_conf_free(g_spdk_app.config);
 	spdk_log_close();
+	spdk_thread_lib_fini();
 }
 
 static void

lib/thread/thread.c

@@ -107,6 +107,17 @@ _set_thread_name(const char *thread_name)
 #endif
 }
 
+int
+spdk_thread_lib_init(void)
+{
+	return 0;
+}
+
+void
+spdk_thread_lib_fini(void)
+{
+}
+
 struct spdk_thread *
 spdk_allocate_thread(spdk_thread_pass_msg msg_fn,
 		     spdk_start_poller start_poller_fn,