add fsctl min_idle_cpu and min-idle-cpu feature to refuse calls after the system fallse below a certian percentage of idle cpu

git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@16962 d0543943-73ff-0310-b7d9-9358b9ac24b2

src/include/private/switch_core_pvt.h

@@ -31,6 +31,9 @@
  * this file does not exist!!!!
  *
  */
+
+#include "switch_profile.h"
+
 #ifndef WIN32
 #include <switch_private.h>
 #endif
@@ -220,6 +223,9 @@ struct switch_runtime {
 	uint32_t runlevel;
 	uint32_t tipping_point;
 	int32_t timer_affinity;
+	switch_profile_timer_t *profile_timer;
+	double profile_time;
+	double min_idle_time;
 };
 
 extern struct switch_runtime runtime;

src/include/switch_core.h

@@ -1901,7 +1901,7 @@ SWITCH_DECLARE(switch_time_t) switch_core_uptime(void);
   \param val the command arguement (if needed)
   \return 0 on success nonzero on error
 */
-SWITCH_DECLARE(int32_t) switch_core_session_ctl(switch_session_ctl_t cmd, int32_t *val);
+SWITCH_DECLARE(int32_t) switch_core_session_ctl(switch_session_ctl_t cmd, void *val);
 
 /*!
   \brief Get the output console
@@ -1970,6 +1970,8 @@ SWITCH_DECLARE(void) switch_time_set_matrix(switch_bool_t enable);
 SWITCH_DECLARE(void) switch_time_set_cond_yield(switch_bool_t enable);
 SWITCH_DECLARE(uint32_t) switch_core_min_dtmf_duration(uint32_t duration);
 SWITCH_DECLARE(uint32_t) switch_core_max_dtmf_duration(uint32_t duration);
+SWITCH_DECLARE(double) switch_core_min_idle_cpu(double new_limit);
+SWITCH_DECLARE(double) switch_core_idle_cpu(void);
 SWITCH_DECLARE(uint32_t) switch_core_default_dtmf_duration(uint32_t duration);
 SWITCH_DECLARE(switch_status_t) switch_console_set_complete(const char *string);
 SWITCH_DECLARE(switch_status_t) switch_console_set_alias(const char *string);

src/include/switch_types.h

@@ -1458,7 +1458,8 @@ typedef enum {
 	SCSC_SHUTDOWN_NOW,
 	SCSC_CALIBRATE_CLOCK,
 	SCSC_SAVE_HISTORY,
-	SCSC_CRASH
+	SCSC_CRASH,
+	SCSC_MIN_IDLE_CPU
 } switch_session_ctl_t;
 
 typedef enum {