src/vlib/threads.h - fdio/vpp - Gitiles

 /*
  * Copyright (c) 2015 Cisco and/or its affiliates.
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at:
  *
  *     http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
 #ifndef included_vlib_threads_h
 #define included_vlib_threads_h

 #include <vlib/main.h>
 #include <linux/sched.h>

 extern vlib_main_t **vlib_mains;

 void vlib_set_thread_name (char *name);

 /* arg is actually a vlib__thread_t * */
 typedef void (vlib_thread_function_t) (void *arg);

 typedef struct vlib_thread_registration_
 {
   /* constructor generated list of thread registrations */
   struct vlib_thread_registration_ *next;

   /* config parameters */
   char *name;
   char *short_name;
   vlib_thread_function_t *function;
   uword mheap_size;
   int fixed_count;
   u32 count;
   int no_data_structure_clone;
   u32 frame_queue_nelts;

   /* All threads of this type run on pthreads */
   int use_pthreads;
   u32 first_index;
   uword *coremask;
 } vlib_thread_registration_t;

 /*
  * Frames have their cpu / vlib_main_t index in the low-order N bits
  * Make VLIB_MAX_CPUS a power-of-two, please...
  */

 #ifndef VLIB_MAX_CPUS
 #define VLIB_MAX_CPUS 256
 #endif

 #if VLIB_MAX_CPUS > CLIB_MAX_MHEAPS
 #error Please increase number of per-cpu mheaps
 #endif

 #define VLIB_CPU_MASK (VLIB_MAX_CPUS - 1)	/* 0x3f, max */
 #define VLIB_OFFSET_MASK (~VLIB_CPU_MASK)

 #define VLIB_LOG2_THREAD_STACK_SIZE (21)
 #define VLIB_THREAD_STACK_SIZE (1<<VLIB_LOG2_THREAD_STACK_SIZE)

 typedef enum
 {
   VLIB_FRAME_QUEUE_ELT_DISPATCH_FRAME,
 } vlib_frame_queue_msg_type_t;

 typedef struct
 {
   CLIB_CACHE_LINE_ALIGN_MARK (cacheline0);
   volatile u32 valid;
   u32 msg_type;
   u32 n_vectors;
   u32 last_n_vectors;

   /* 256 * 4 = 1024 bytes, even mult of cache line size */
   u32 buffer_index[VLIB_FRAME_SIZE];
 }
 vlib_frame_queue_elt_t;

 typedef struct
 {
   /* First cache line */
   CLIB_CACHE_LINE_ALIGN_MARK (cacheline0);
   volatile u32 *wait_at_barrier;
   volatile u32 *workers_at_barrier;

   /* Second Cache Line */
     CLIB_CACHE_LINE_ALIGN_MARK (cacheline1);
   void *thread_mheap;
   u8 *thread_stack;
   void (*thread_function) (void *);
   void *thread_function_arg;
   i64 recursion_level;
   elog_track_t elog_track;
   u32 instance_id;
   vlib_thread_registration_t *registration;
   u8 *name;
   u64 barrier_sync_count;
   u8 barrier_elog_enabled;
   const char *barrier_caller;
   const char *barrier_context;
   volatile u32 *node_reforks_required;

   long lwp;
   int lcore_id;
   pthread_t thread_id;
 } vlib_worker_thread_t;

 extern vlib_worker_thread_t *vlib_worker_threads;

 typedef struct
 {
   /* enqueue side */
   CLIB_CACHE_LINE_ALIGN_MARK (cacheline0);
   volatile u64 tail;
   u64 enqueues;
   u64 enqueue_ticks;
   u64 enqueue_vectors;
   u32 enqueue_full_events;

   /* dequeue side */
     CLIB_CACHE_LINE_ALIGN_MARK (cacheline1);
   volatile u64 head;
   u64 dequeues;
   u64 dequeue_ticks;
   u64 dequeue_vectors;
   u64 trace;
   u64 vector_threshold;

   /* dequeue hint to enqueue side */
     CLIB_CACHE_LINE_ALIGN_MARK (cacheline2);
   volatile u64 head_hint;

   /* read-only, constant, shared */
     CLIB_CACHE_LINE_ALIGN_MARK (cacheline3);
   vlib_frame_queue_elt_t *elts;
   u32 nelts;
 }
 vlib_frame_queue_t;

 typedef struct
 {
   vlib_frame_queue_elt_t **handoff_queue_elt_by_thread_index;
   vlib_frame_queue_t **congested_handoff_queue_by_thread_index;
 } vlib_frame_queue_per_thread_data_t;

 typedef struct
 {
   u32 node_index;
   u32 frame_queue_nelts;
   u32 queue_hi_thresh;

   vlib_frame_queue_t **vlib_frame_queues;
   vlib_frame_queue_per_thread_data_t *per_thread_data;

   /* for frame queue tracing */
   frame_queue_trace_t *frame_queue_traces;
   frame_queue_nelt_counter_t *frame_queue_histogram;
 } vlib_frame_queue_main_t;

 typedef struct
 {
   uword node_index;
   uword type_opaque;
   uword data;
 } vlib_process_signal_event_mt_args_t;

 /* Called early, in thread 0's context */
 clib_error_t *vlib_thread_init (vlib_main_t * vm);

 int vlib_frame_queue_enqueue (vlib_main_t * vm, u32 node_runtime_index,
 			      u32 frame_queue_index, vlib_frame_t * frame,
 			      vlib_frame_queue_msg_type_t type);

 int
 vlib_frame_queue_dequeue (vlib_main_t * vm, vlib_frame_queue_main_t * fqm);

 void vlib_worker_thread_node_runtime_update (void);

 void vlib_create_worker_threads (vlib_main_t * vm, int n,
 				 void (*thread_function) (void *));

 void vlib_worker_thread_init (vlib_worker_thread_t * w);
 u32 vlib_frame_queue_main_init (u32 node_index, u32 frame_queue_nelts);

 /* Check for a barrier sync request every 30ms */
 #define BARRIER_SYNC_DELAY (0.030000)

 #if CLIB_DEBUG > 0
 /* long barrier timeout, for gdb... */
 #define BARRIER_SYNC_TIMEOUT (600.1)
 #else
 #define BARRIER_SYNC_TIMEOUT (1.0)
 #endif

 #define vlib_worker_thread_barrier_sync(X) {vlib_worker_threads[0].barrier_caller=__FUNCTION__;vlib_worker_thread_barrier_sync_int(X);}

 void vlib_worker_thread_barrier_sync_int (vlib_main_t * vm);
 void vlib_worker_thread_barrier_release (vlib_main_t * vm);
 void vlib_worker_thread_node_refork (void);

 static_always_inline uword
 vlib_get_thread_index (void)
 {
   return __os_thread_index;
 }

 always_inline void
 vlib_smp_unsafe_warning (void)
 {
   if (CLIB_DEBUG > 0)
     {
       if (vlib_get_thread_index ())
 	fformat (stderr, "%s: SMP unsafe warning...\n", __FUNCTION__);
     }
 }

 typedef enum
 {
   VLIB_WORKER_THREAD_FORK_FIXUP_ILLEGAL = 0,
   VLIB_WORKER_THREAD_FORK_FIXUP_NEW_SW_IF_INDEX,
 } vlib_fork_fixup_t;

 void vlib_worker_thread_fork_fixup (vlib_fork_fixup_t which);

 #define foreach_vlib_main(body)                         \
 do {                                                    \
   vlib_main_t ** __vlib_mains = 0, *this_vlib_main;     \
   int ii;                                               \
                                                         \
   for (ii = 0; ii < vec_len (vlib_mains); ii++)         \
     {                                                   \
       this_vlib_main = vlib_mains[ii];                  \
       ASSERT (ii == 0 ||                                \
 	      this_vlib_main->parked_at_barrier == 1);  \
       if (this_vlib_main)                               \
         vec_add1 (__vlib_mains, this_vlib_main);        \
     }                                                   \
                                                         \
   for (ii = 0; ii < vec_len (__vlib_mains); ii++)       \
     {                                                   \
       this_vlib_main = __vlib_mains[ii];                \
       /* body uses this_vlib_main... */                 \
       (body);                                           \
     }                                                   \
   vec_free (__vlib_mains);                              \
 } while (0);

 #define foreach_sched_policy \
   _(SCHED_OTHER, OTHER, "other") \
   _(SCHED_BATCH, BATCH, "batch") \
   _(SCHED_IDLE, IDLE, "idle")   \
   _(SCHED_FIFO, FIFO, "fifo")   \
   _(SCHED_RR, RR, "rr")

 typedef enum
 {
 #define _(v,f,s) SCHED_POLICY_##f = v,
   foreach_sched_policy
 #undef _
     SCHED_POLICY_N,
 } sched_policy_t;

 typedef struct
 {
   clib_error_t *(*vlib_launch_thread_cb) (void *fp, vlib_worker_thread_t * w,
 					  unsigned lcore_id);
   clib_error_t *(*vlib_thread_set_lcore_cb) (u32 thread, u16 lcore);
 } vlib_thread_callbacks_t;

 typedef struct
 {
   /* Link list of registrations, built by constructors */
   vlib_thread_registration_t *next;

   /* Vector of registrations, w/ non-data-structure clones at the top */
   vlib_thread_registration_t **registrations;

   uword *thread_registrations_by_name;

   vlib_worker_thread_t *worker_threads;

   /*
    * Launch all threads as pthreads,
    * not eal_rte_launch (strict affinity) threads
    */
   int use_pthreads;

   /* Number of vlib_main / vnet_main clones */
   u32 n_vlib_mains;

   /* Number of thread stacks to create */
   u32 n_thread_stacks;

   /* Number of pthreads */
   u32 n_pthreads;

   /* Number of threads */
   u32 n_threads;

   /* Number of cores to skip, must match the core mask */
   u32 skip_cores;

   /* Thread prefix name */
   u8 *thread_prefix;

   /* main thread lcore */
   u32 main_lcore;

   /* Bitmap of available CPU cores */
   uword *cpu_core_bitmap;

   /* Bitmap of available CPU sockets (NUMA nodes) */
   uword *cpu_socket_bitmap;

   /* Worker handoff queues */
   vlib_frame_queue_main_t *frame_queue_mains;

   /* worker thread initialization barrier */
   volatile u32 worker_thread_release;

   /* scheduling policy */
   u32 sched_policy;

   /* scheduling policy priority */
   u32 sched_priority;

   /* callbacks */
   vlib_thread_callbacks_t cb;
   int extern_thread_mgmt;
 } vlib_thread_main_t;

 extern vlib_thread_main_t vlib_thread_main;

 #include <vlib/global_funcs.h>

 #define VLIB_REGISTER_THREAD(x,...)                     \
   __VA_ARGS__ vlib_thread_registration_t x;             \
 static void __vlib_add_thread_registration_##x (void)   \
   __attribute__((__constructor__)) ;                    \
 static void __vlib_add_thread_registration_##x (void)   \
 {                                                       \
   vlib_thread_main_t * tm = &vlib_thread_main;          \
   x.next = tm->next;                                    \
   tm->next = &x;                                        \
 }                                                       \
 static void __vlib_rm_thread_registration_##x (void)    \
   __attribute__((__destructor__)) ;                     \
 static void __vlib_rm_thread_registration_##x (void)    \
 {                                                       \
   vlib_thread_main_t * tm = &vlib_thread_main;          \
   VLIB_REMOVE_FROM_LINKED_LIST (tm->next, &x, next);    \
 }                                                       \
 __VA_ARGS__ vlib_thread_registration_t x

 always_inline u32
 vlib_num_workers ()
 {
   return vlib_thread_main.n_vlib_mains - 1;
 }

 always_inline u32
 vlib_get_worker_thread_index (u32 worker_index)
 {
   return worker_index + 1;
 }

 always_inline u32
 vlib_get_worker_index (u32 thread_index)
 {
   return thread_index - 1;
 }

 always_inline u32
 vlib_get_current_worker_index ()
 {
   return vlib_get_thread_index () - 1;
 }

 static inline void
 vlib_worker_thread_barrier_check (void)
 {
   if (PREDICT_FALSE (*vlib_worker_threads->wait_at_barrier))
     {
       vlib_main_t *vm = vlib_get_main ();
       u32 thread_index = vm->thread_index;
       f64 t = vlib_time_now (vm);

       if (PREDICT_FALSE (vlib_worker_threads->barrier_elog_enabled))
 	{
 	  vlib_worker_thread_t *w = vlib_worker_threads + thread_index;
 	  /* *INDENT-OFF* */
 	  ELOG_TYPE_DECLARE (e) = {
 	    .format = "barrier-wait-thread-%d",
 	    .format_args = "i4",
 	  };
 	  /* *INDENT-ON* */

 	  struct
 	  {
 	    u32 thread_index;
 	  } __clib_packed *ed;

 	  ed = ELOG_TRACK_DATA (&vlib_global_main.elog_main, e,
 				w->elog_track);
 	  ed->thread_index = thread_index;
 	}

       clib_smp_atomic_add (vlib_worker_threads->workers_at_barrier, 1);
       if (CLIB_DEBUG > 0)
 	{
 	  vm = vlib_get_main ();
 	  vm->parked_at_barrier = 1;
 	}
       while (*vlib_worker_threads->wait_at_barrier)
 	;
       if (CLIB_DEBUG > 0)
 	vm->parked_at_barrier = 0;
       clib_smp_atomic_add (vlib_worker_threads->workers_at_barrier, -1);

       if (PREDICT_FALSE (*vlib_worker_threads->node_reforks_required))
 	{
 	  if (PREDICT_FALSE (vlib_worker_threads->barrier_elog_enabled))
 	    {
 	      t = vlib_time_now (vm) - t;
 	      vlib_worker_thread_t *w = vlib_worker_threads + thread_index;
               /* *INDENT-OFF* */
               ELOG_TYPE_DECLARE (e) = {
                 .format = "barrier-refork-thread-%d",
                 .format_args = "i4",
               };
               /* *INDENT-ON* */

 	      struct
 	      {
 		u32 thread_index;
 	      } __clib_packed *ed;

 	      ed = ELOG_TRACK_DATA (&vlib_global_main.elog_main, e,
 				    w->elog_track);
 	      ed->thread_index = thread_index;
 	    }

 	  vlib_worker_thread_node_refork ();
 	  clib_smp_atomic_add (vlib_worker_threads->node_reforks_required,
 			       -1);
 	  while (*vlib_worker_threads->node_reforks_required)
 	    ;
 	}
       if (PREDICT_FALSE (vlib_worker_threads->barrier_elog_enabled))
 	{
 	  t = vlib_time_now (vm) - t;
 	  vlib_worker_thread_t *w = vlib_worker_threads + thread_index;
 	  /* *INDENT-OFF* */
 	  ELOG_TYPE_DECLARE (e) = {
 	    .format = "barrier-released-thread-%d: %dus",
 	    .format_args = "i4i4",
 	  };
 	  /* *INDENT-ON* */

 	  struct
 	  {
 	    u32 thread_index;
 	    u32 duration;
 	  } __clib_packed *ed;

 	  ed = ELOG_TRACK_DATA (&vlib_global_main.elog_main, e,
 				w->elog_track);
 	  ed->thread_index = thread_index;
 	  ed->duration = (int) (1000000.0 * t);
 	}
     }
 }

 always_inline vlib_main_t *
 vlib_get_worker_vlib_main (u32 worker_index)
 {
   vlib_main_t *vm;
   vlib_thread_main_t *tm = &vlib_thread_main;
   ASSERT (worker_index < tm->n_vlib_mains - 1);
   vm = vlib_mains[worker_index + 1];
   ASSERT (vm);
   return vm;
 }

 static inline u8
 vlib_thread_is_main_w_barrier (void)
 {
   return (!vlib_num_workers ()
 	  || ((vlib_get_thread_index () == 0
 	       && vlib_worker_threads->wait_at_barrier[0])));
 }

 static inline void
 vlib_put_frame_queue_elt (vlib_frame_queue_elt_t * hf)
 {
   CLIB_MEMORY_BARRIER ();
   hf->valid = 1;
 }

 static inline vlib_frame_queue_elt_t *
 vlib_get_frame_queue_elt (u32 frame_queue_index, u32 index)
 {
   vlib_frame_queue_t *fq;
   vlib_frame_queue_elt_t *elt;
   vlib_thread_main_t *tm = &vlib_thread_main;
   vlib_frame_queue_main_t *fqm =
     vec_elt_at_index (tm->frame_queue_mains, frame_queue_index);
   u64 new_tail;

   fq = fqm->vlib_frame_queues[index];
   ASSERT (fq);

   new_tail = __sync_add_and_fetch (&fq->tail, 1);

   /* Wait until a ring slot is available */
   while (new_tail >= fq->head_hint + fq->nelts)
     vlib_worker_thread_barrier_check ();

   elt = fq->elts + (new_tail & (fq->nelts - 1));

   /* this would be very bad... */
   while (elt->valid)
     ;

   elt->msg_type = VLIB_FRAME_QUEUE_ELT_DISPATCH_FRAME;
   elt->last_n_vectors = elt->n_vectors = 0;

   return elt;
 }

 static inline vlib_frame_queue_t *
 is_vlib_frame_queue_congested (u32 frame_queue_index,
 			       u32 index,
 			       u32 queue_hi_thresh,
 			       vlib_frame_queue_t **
 			       handoff_queue_by_worker_index)
 {
   vlib_frame_queue_t *fq;
   vlib_thread_main_t *tm = &vlib_thread_main;
   vlib_frame_queue_main_t *fqm =
     vec_elt_at_index (tm->frame_queue_mains, frame_queue_index);

   fq = handoff_queue_by_worker_index[index];
   if (fq != (vlib_frame_queue_t *) (~0))
     return fq;

   fq = fqm->vlib_frame_queues[index];
   ASSERT (fq);

   if (PREDICT_FALSE (fq->tail >= (fq->head_hint + queue_hi_thresh)))
     {
       /* a valid entry in the array will indicate the queue has reached
        * the specified threshold and is congested
        */
       handoff_queue_by_worker_index[index] = fq;
       fq->enqueue_full_events++;
       return fq;
     }

   return NULL;
 }

 static inline vlib_frame_queue_elt_t *
 vlib_get_worker_handoff_queue_elt (u32 frame_queue_index,
 				   u32 vlib_worker_index,
 				   vlib_frame_queue_elt_t **
 				   handoff_queue_elt_by_worker_index)
 {
   vlib_frame_queue_elt_t *elt;

   if (handoff_queue_elt_by_worker_index[vlib_worker_index])
     return handoff_queue_elt_by_worker_index[vlib_worker_index];

   elt = vlib_get_frame_queue_elt (frame_queue_index, vlib_worker_index);

   handoff_queue_elt_by_worker_index[vlib_worker_index] = elt;

   return elt;
 }

 u8 *vlib_thread_stack_init (uword thread_index);
 int vlib_thread_cb_register (struct vlib_main_t *vm,
 			     vlib_thread_callbacks_t * cb);
 extern void *rpc_call_main_thread_cb_fn;

 void
 vlib_process_signal_event_mt_helper (vlib_process_signal_event_mt_args_t *
 				     args);
 void vlib_rpc_call_main_thread (void *function, u8 * args, u32 size);

 #endif /* included_vlib_threads_h */

 /*
  * fd.io coding-style-patch-verification: ON
  *
  * Local Variables:
  * eval: (c-set-style "gnu")
  * End:
  */
	/*
	* Copyright (c) 2015 Cisco and/or its affiliates.
	* Licensed under the Apache License, Version 2.0 (the "License");
	* you may not use this file except in compliance with the License.
	* You may obtain a copy of the License at:
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS,
	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	* See the License for the specific language governing permissions and
	* limitations under the License.
	*/
	#ifndef included_vlib_threads_h
	#define included_vlib_threads_h

	#include <vlib/main.h>
	#include <linux/sched.h>

	extern vlib_main_t **vlib_mains;

	void vlib_set_thread_name (char *name);

	/* arg is actually a vlib__thread_t * */
	typedef void (vlib_thread_function_t) (void *arg);

	typedef struct vlib_thread_registration_
	{
	/* constructor generated list of thread registrations */
	struct vlib_thread_registration_ *next;

	/* config parameters */
	char *name;
	char *short_name;
	vlib_thread_function_t *function;
	uword mheap_size;
	int fixed_count;
	u32 count;
	int no_data_structure_clone;
	u32 frame_queue_nelts;

	/* All threads of this type run on pthreads */
	int use_pthreads;
	u32 first_index;
	uword *coremask;
	} vlib_thread_registration_t;

	/*
	* Frames have their cpu / vlib_main_t index in the low-order N bits
	* Make VLIB_MAX_CPUS a power-of-two, please...
	*/

	#ifndef VLIB_MAX_CPUS
	#define VLIB_MAX_CPUS 256
	#endif

	#if VLIB_MAX_CPUS > CLIB_MAX_MHEAPS
	#error Please increase number of per-cpu mheaps
	#endif

	#define VLIB_CPU_MASK (VLIB_MAX_CPUS - 1) /* 0x3f, max */
	#define VLIB_OFFSET_MASK (~VLIB_CPU_MASK)

	#define VLIB_LOG2_THREAD_STACK_SIZE (21)
	#define VLIB_THREAD_STACK_SIZE (1<<VLIB_LOG2_THREAD_STACK_SIZE)

	typedef enum
	{
	VLIB_FRAME_QUEUE_ELT_DISPATCH_FRAME,
	} vlib_frame_queue_msg_type_t;

	typedef struct
	{
	CLIB_CACHE_LINE_ALIGN_MARK (cacheline0);
	volatile u32 valid;
	u32 msg_type;
	u32 n_vectors;
	u32 last_n_vectors;

	/* 256 * 4 = 1024 bytes, even mult of cache line size */
	u32 buffer_index[VLIB_FRAME_SIZE];
	}
	vlib_frame_queue_elt_t;

	typedef struct
	{
	/* First cache line */
	CLIB_CACHE_LINE_ALIGN_MARK (cacheline0);
	volatile u32 *wait_at_barrier;
	volatile u32 *workers_at_barrier;

	/* Second Cache Line */
	CLIB_CACHE_LINE_ALIGN_MARK (cacheline1);
	void *thread_mheap;
	u8 *thread_stack;
	void (thread_function) (void );
	void *thread_function_arg;
	i64 recursion_level;
	elog_track_t elog_track;
	u32 instance_id;
	vlib_thread_registration_t *registration;
	u8 *name;
	u64 barrier_sync_count;
	u8 barrier_elog_enabled;
	const char *barrier_caller;
	const char *barrier_context;
	volatile u32 *node_reforks_required;

	long lwp;
	int lcore_id;
	pthread_t thread_id;
	} vlib_worker_thread_t;

	extern vlib_worker_thread_t *vlib_worker_threads;

	typedef struct
	{
	/* enqueue side */
	CLIB_CACHE_LINE_ALIGN_MARK (cacheline0);
	volatile u64 tail;
	u64 enqueues;
	u64 enqueue_ticks;
	u64 enqueue_vectors;
	u32 enqueue_full_events;

	/* dequeue side */
	CLIB_CACHE_LINE_ALIGN_MARK (cacheline1);
	volatile u64 head;
	u64 dequeues;
	u64 dequeue_ticks;
	u64 dequeue_vectors;
	u64 trace;
	u64 vector_threshold;

	/* dequeue hint to enqueue side */
	CLIB_CACHE_LINE_ALIGN_MARK (cacheline2);
	volatile u64 head_hint;

	/* read-only, constant, shared */
	CLIB_CACHE_LINE_ALIGN_MARK (cacheline3);
	vlib_frame_queue_elt_t *elts;
	u32 nelts;
	}
	vlib_frame_queue_t;

	typedef struct
	{
	vlib_frame_queue_elt_t **handoff_queue_elt_by_thread_index;
	vlib_frame_queue_t **congested_handoff_queue_by_thread_index;
	} vlib_frame_queue_per_thread_data_t;

	typedef struct
	{
	u32 node_index;
	u32 frame_queue_nelts;
	u32 queue_hi_thresh;

	vlib_frame_queue_t **vlib_frame_queues;
	vlib_frame_queue_per_thread_data_t *per_thread_data;

	/* for frame queue tracing */
	frame_queue_trace_t *frame_queue_traces;
	frame_queue_nelt_counter_t *frame_queue_histogram;
	} vlib_frame_queue_main_t;

	typedef struct
	{
	uword node_index;
	uword type_opaque;
	uword data;
	} vlib_process_signal_event_mt_args_t;

	/* Called early, in thread 0's context */
	clib_error_t vlib_thread_init (vlib_main_t vm);

	int vlib_frame_queue_enqueue (vlib_main_t * vm, u32 node_runtime_index,
	u32 frame_queue_index, vlib_frame_t * frame,
	vlib_frame_queue_msg_type_t type);

	int
	vlib_frame_queue_dequeue (vlib_main_t * vm, vlib_frame_queue_main_t * fqm);

	void vlib_worker_thread_node_runtime_update (void);

	void vlib_create_worker_threads (vlib_main_t * vm, int n,
	void (thread_function) (void ));

	void vlib_worker_thread_init (vlib_worker_thread_t * w);
	u32 vlib_frame_queue_main_init (u32 node_index, u32 frame_queue_nelts);

	/* Check for a barrier sync request every 30ms */
	#define BARRIER_SYNC_DELAY (0.030000)

	#if CLIB_DEBUG > 0
	/* long barrier timeout, for gdb... */
	#define BARRIER_SYNC_TIMEOUT (600.1)
	#else
	#define BARRIER_SYNC_TIMEOUT (1.0)
	#endif

	#define vlib_worker_thread_barrier_sync(X) {vlib_worker_threads[0].barrier_caller=__FUNCTION__;vlib_worker_thread_barrier_sync_int(X);}

	void vlib_worker_thread_barrier_sync_int (vlib_main_t * vm);
	void vlib_worker_thread_barrier_release (vlib_main_t * vm);
	void vlib_worker_thread_node_refork (void);

	static_always_inline uword
	vlib_get_thread_index (void)
	{
	return __os_thread_index;
	}

	always_inline void
	vlib_smp_unsafe_warning (void)
	{
	if (CLIB_DEBUG > 0)
	{
	if (vlib_get_thread_index ())
	fformat (stderr, "%s: SMP unsafe warning...\n", __FUNCTION__);
	}
	}

	typedef enum
	{
	VLIB_WORKER_THREAD_FORK_FIXUP_ILLEGAL = 0,
	VLIB_WORKER_THREAD_FORK_FIXUP_NEW_SW_IF_INDEX,
	} vlib_fork_fixup_t;

	void vlib_worker_thread_fork_fixup (vlib_fork_fixup_t which);

	#define foreach_vlib_main(body) \
	do { \
	vlib_main_t ** __vlib_mains = 0, *this_vlib_main; \
	int ii; \
	\
	for (ii = 0; ii < vec_len (vlib_mains); ii++) \
	{ \
	this_vlib_main = vlib_mains[ii]; \
	ASSERT (ii == 0 \|\| \
	this_vlib_main->parked_at_barrier == 1); \
	if (this_vlib_main) \
	vec_add1 (__vlib_mains, this_vlib_main); \
	} \
	\
	for (ii = 0; ii < vec_len (__vlib_mains); ii++) \
	{ \
	this_vlib_main = __vlib_mains[ii]; \
	/* body uses this_vlib_main... */ \
	(body); \
	} \
	vec_free (__vlib_mains); \
	} while (0);

	#define foreach_sched_policy \
	_(SCHED_OTHER, OTHER, "other") \
	_(SCHED_BATCH, BATCH, "batch") \
	_(SCHED_IDLE, IDLE, "idle") \
	_(SCHED_FIFO, FIFO, "fifo") \
	_(SCHED_RR, RR, "rr")

	typedef enum
	{
	#define _(v,f,s) SCHED_POLICY_##f = v,
	foreach_sched_policy
	#undef _
	SCHED_POLICY_N,
	} sched_policy_t;

	typedef struct
	{
	clib_error_t (vlib_launch_thread_cb) (void fp, vlib_worker_thread_t w,
	unsigned lcore_id);
	clib_error_t (vlib_thread_set_lcore_cb) (u32 thread, u16 lcore);
	} vlib_thread_callbacks_t;

	typedef struct
	{
	/* Link list of registrations, built by constructors */
	vlib_thread_registration_t *next;

	/* Vector of registrations, w/ non-data-structure clones at the top */
	vlib_thread_registration_t **registrations;

	uword *thread_registrations_by_name;

	vlib_worker_thread_t *worker_threads;

	/*
	* Launch all threads as pthreads,
	* not eal_rte_launch (strict affinity) threads
	*/
	int use_pthreads;

	/* Number of vlib_main / vnet_main clones */
	u32 n_vlib_mains;

	/* Number of thread stacks to create */
	u32 n_thread_stacks;

	/* Number of pthreads */
	u32 n_pthreads;

	/* Number of threads */
	u32 n_threads;

	/* Number of cores to skip, must match the core mask */
	u32 skip_cores;

	/* Thread prefix name */
	u8 *thread_prefix;

	/* main thread lcore */
	u32 main_lcore;

	/* Bitmap of available CPU cores */
	uword *cpu_core_bitmap;

	/* Bitmap of available CPU sockets (NUMA nodes) */
	uword *cpu_socket_bitmap;

	/* Worker handoff queues */
	vlib_frame_queue_main_t *frame_queue_mains;

	/* worker thread initialization barrier */
	volatile u32 worker_thread_release;

	/* scheduling policy */
	u32 sched_policy;

	/* scheduling policy priority */
	u32 sched_priority;

	/* callbacks */
	vlib_thread_callbacks_t cb;
	int extern_thread_mgmt;
	} vlib_thread_main_t;

	extern vlib_thread_main_t vlib_thread_main;

	#include <vlib/global_funcs.h>

	#define VLIB_REGISTER_THREAD(x,...) \
	__VA_ARGS__ vlib_thread_registration_t x; \
	static void __vlib_add_thread_registration_##x (void) \
	__attribute__((__constructor__)) ; \
	static void __vlib_add_thread_registration_##x (void) \
	{ \
	vlib_thread_main_t * tm = &vlib_thread_main; \
	x.next = tm->next; \
	tm->next = &x; \
	} \
	static void __vlib_rm_thread_registration_##x (void) \
	__attribute__((__destructor__)) ; \
	static void __vlib_rm_thread_registration_##x (void) \
	{ \
	vlib_thread_main_t * tm = &vlib_thread_main; \
	VLIB_REMOVE_FROM_LINKED_LIST (tm->next, &x, next); \
	} \
	__VA_ARGS__ vlib_thread_registration_t x

	always_inline u32
	vlib_num_workers ()
	{
	return vlib_thread_main.n_vlib_mains - 1;
	}

	always_inline u32
	vlib_get_worker_thread_index (u32 worker_index)
	{
	return worker_index + 1;
	}

	always_inline u32
	vlib_get_worker_index (u32 thread_index)
	{
	return thread_index - 1;
	}

	always_inline u32
	vlib_get_current_worker_index ()
	{
	return vlib_get_thread_index () - 1;
	}

	static inline void
	vlib_worker_thread_barrier_check (void)
	{
	if (PREDICT_FALSE (*vlib_worker_threads->wait_at_barrier))
	{
	vlib_main_t *vm = vlib_get_main ();
	u32 thread_index = vm->thread_index;
	f64 t = vlib_time_now (vm);

	if (PREDICT_FALSE (vlib_worker_threads->barrier_elog_enabled))
	{
	vlib_worker_thread_t *w = vlib_worker_threads + thread_index;
	/* INDENT-OFF */
	ELOG_TYPE_DECLARE (e) = {
	.format = "barrier-wait-thread-%d",
	.format_args = "i4",
	};
	/* INDENT-ON */

	struct
	{
	u32 thread_index;
	} __clib_packed *ed;

	ed = ELOG_TRACK_DATA (&vlib_global_main.elog_main, e,
	w->elog_track);
	ed->thread_index = thread_index;
	}

	clib_smp_atomic_add (vlib_worker_threads->workers_at_barrier, 1);
	if (CLIB_DEBUG > 0)
	{
	vm = vlib_get_main ();
	vm->parked_at_barrier = 1;
	}
	while (*vlib_worker_threads->wait_at_barrier)
	;
	if (CLIB_DEBUG > 0)
	vm->parked_at_barrier = 0;
	clib_smp_atomic_add (vlib_worker_threads->workers_at_barrier, -1);

	if (PREDICT_FALSE (*vlib_worker_threads->node_reforks_required))
	{
	if (PREDICT_FALSE (vlib_worker_threads->barrier_elog_enabled))
	{
	t = vlib_time_now (vm) - t;
	vlib_worker_thread_t *w = vlib_worker_threads + thread_index;
	/* INDENT-OFF */
	ELOG_TYPE_DECLARE (e) = {
	.format = "barrier-refork-thread-%d",
	.format_args = "i4",
	};
	/* INDENT-ON */

	struct
	{
	u32 thread_index;
	} __clib_packed *ed;

	ed = ELOG_TRACK_DATA (&vlib_global_main.elog_main, e,
	w->elog_track);
	ed->thread_index = thread_index;
	}

	vlib_worker_thread_node_refork ();
	clib_smp_atomic_add (vlib_worker_threads->node_reforks_required,
	-1);
	while (*vlib_worker_threads->node_reforks_required)
	;
	}
	if (PREDICT_FALSE (vlib_worker_threads->barrier_elog_enabled))
	{
	t = vlib_time_now (vm) - t;
	vlib_worker_thread_t *w = vlib_worker_threads + thread_index;
	/* INDENT-OFF */
	ELOG_TYPE_DECLARE (e) = {
	.format = "barrier-released-thread-%d: %dus",
	.format_args = "i4i4",
	};
	/* INDENT-ON */

	struct
	{
	u32 thread_index;
	u32 duration;
	} __clib_packed *ed;

	ed = ELOG_TRACK_DATA (&vlib_global_main.elog_main, e,
	w->elog_track);
	ed->thread_index = thread_index;
	ed->duration = (int) (1000000.0 * t);
	}
	}
	}

	always_inline vlib_main_t *
	vlib_get_worker_vlib_main (u32 worker_index)
	{
	vlib_main_t *vm;
	vlib_thread_main_t *tm = &vlib_thread_main;
	ASSERT (worker_index < tm->n_vlib_mains - 1);
	vm = vlib_mains[worker_index + 1];
	ASSERT (vm);
	return vm;
	}

	static inline u8
	vlib_thread_is_main_w_barrier (void)
	{
	return (!vlib_num_workers ()
	\|\| ((vlib_get_thread_index () == 0
	&& vlib_worker_threads->wait_at_barrier[0])));
	}

	static inline void
	vlib_put_frame_queue_elt (vlib_frame_queue_elt_t * hf)
	{
	CLIB_MEMORY_BARRIER ();
	hf->valid = 1;
	}

	static inline vlib_frame_queue_elt_t *
	vlib_get_frame_queue_elt (u32 frame_queue_index, u32 index)
	{
	vlib_frame_queue_t *fq;
	vlib_frame_queue_elt_t *elt;
	vlib_thread_main_t *tm = &vlib_thread_main;
	vlib_frame_queue_main_t *fqm =
	vec_elt_at_index (tm->frame_queue_mains, frame_queue_index);
	u64 new_tail;

	fq = fqm->vlib_frame_queues[index];
	ASSERT (fq);

	new_tail = __sync_add_and_fetch (&fq->tail, 1);

	/* Wait until a ring slot is available */
	while (new_tail >= fq->head_hint + fq->nelts)
	vlib_worker_thread_barrier_check ();

	elt = fq->elts + (new_tail & (fq->nelts - 1));

	/* this would be very bad... */
	while (elt->valid)
	;

	elt->msg_type = VLIB_FRAME_QUEUE_ELT_DISPATCH_FRAME;
	elt->last_n_vectors = elt->n_vectors = 0;

	return elt;
	}

	static inline vlib_frame_queue_t *
	is_vlib_frame_queue_congested (u32 frame_queue_index,
	u32 index,
	u32 queue_hi_thresh,
	vlib_frame_queue_t **
	handoff_queue_by_worker_index)
	{
	vlib_frame_queue_t *fq;
	vlib_thread_main_t *tm = &vlib_thread_main;
	vlib_frame_queue_main_t *fqm =
	vec_elt_at_index (tm->frame_queue_mains, frame_queue_index);

	fq = handoff_queue_by_worker_index[index];
	if (fq != (vlib_frame_queue_t *) (~0))
	return fq;

	fq = fqm->vlib_frame_queues[index];
	ASSERT (fq);

	if (PREDICT_FALSE (fq->tail >= (fq->head_hint + queue_hi_thresh)))
	{
	/* a valid entry in the array will indicate the queue has reached
	* the specified threshold and is congested
	*/
	handoff_queue_by_worker_index[index] = fq;
	fq->enqueue_full_events++;
	return fq;
	}

	return NULL;
	}

	static inline vlib_frame_queue_elt_t *
	vlib_get_worker_handoff_queue_elt (u32 frame_queue_index,
	u32 vlib_worker_index,
	vlib_frame_queue_elt_t **
	handoff_queue_elt_by_worker_index)
	{
	vlib_frame_queue_elt_t *elt;

	if (handoff_queue_elt_by_worker_index[vlib_worker_index])
	return handoff_queue_elt_by_worker_index[vlib_worker_index];

	elt = vlib_get_frame_queue_elt (frame_queue_index, vlib_worker_index);

	handoff_queue_elt_by_worker_index[vlib_worker_index] = elt;

	return elt;
	}

	u8 *vlib_thread_stack_init (uword thread_index);
	int vlib_thread_cb_register (struct vlib_main_t *vm,
	vlib_thread_callbacks_t * cb);
	extern void *rpc_call_main_thread_cb_fn;

	void
	vlib_process_signal_event_mt_helper (vlib_process_signal_event_mt_args_t *
	args);
	void vlib_rpc_call_main_thread (void function, u8 args, u32 size);

	#endif /* included_vlib_threads_h */

	/*
	* fd.io coding-style-patch-verification: ON
	*
	* Local Variables:
	* eval: (c-set-style "gnu")
	* End:
	*/