add cumulative count of sessions from switch startup. Resolves http://jira.freeswitch.org/browse/FSCORE-18. Updated patch to change data type of session_id to avoid rollover (wouldn't that be nice) and added - 1 to accurately reflect count. Thanks bkw for the patch.

git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@4999 d0543943-73ff-0310-b7d9-9358b9ac24b2

src/include/switch_core.h

@@ -441,6 +441,12 @@ SWITCH_DECLARE(void) switch_core_session_destroy(switch_core_session_t **session
 */
 SWITCH_DECLARE(uint32_t) switch_core_session_count(void);
 
+/*! 
+  \brief Provide the current session_id
+  \return the total number of allocated sessions since core startup
+*/
+SWITCH_DECLARE(switch_size_t) switch_core_session_id(void);
+
 /*! 
   \brief Allocate and return a new session from the core based on a given endpoint module name
   \param endpoint_name the name of the endpoint module