Use thread local storage for thread index

This patch deprecates stack-based thread identification,
Also removes requirement that thread stacks are adjacent.

Finally, possibly annoying for some folks, it renames
all occurences of cpu_index and cpu_number with thread
index. Using word "cpu" is misleading here as thread can
be migrated ti different CPU, and also it is not related
to linux cpu index.

Change-Id: I68cdaf661e701d2336fc953dcb9978d10a70f7c1
Signed-off-by: Damjan Marion <damarion@cisco.com>

2 files changed, 8 insertions, 8 deletions

diff --git a/src/vpp/stats/stats.c b/src/vpp/stats/stats.c
index 042d02e2..4309cd51 100644
--- a/src/vpp/stats/stats.c
+++ b/src/vpp/stats/stats.c
@@ -66,14 +66,14 @@ _(VNET_IP6_NBR_COUNTERS, vnet_ip6_nbr_counters)
 void
 dslock (stats_main_t * sm, int release_hint, int tag)
 {
-  u32 thread_id;
+  u32 thread_index;
   data_structure_lock_t *l = sm->data_structure_lock;
 
   if (PREDICT_FALSE (l == 0))
     return;
 
-  thread_id = os_get_cpu_number ();
-  if (l->lock && l->thread_id == thread_id)
+  thread_index = vlib_get_thread_index ();
+  if (l->lock && l->thread_index == thread_index)
     {
       l->count++;
       return;
@@ -85,7 +85,7 @@ dslock (stats_main_t * sm, int release_hint, int tag)
   while (__sync_lock_test_and_set (&l->lock, 1))
     /* zzzz */ ;
   l->tag = tag;
-  l->thread_id = thread_id;
+  l->thread_index = thread_index;
   l->count = 1;
 }
 
@@ -99,14 +99,14 @@ stats_dslock_with_hint (int hint, int tag)
 void
 dsunlock (stats_main_t * sm)
 {
-  u32 thread_id;
+  u32 thread_index;
   data_structure_lock_t *l = sm->data_structure_lock;
 
   if (PREDICT_FALSE (l == 0))
     return;
 
-  thread_id = os_get_cpu_number ();
-  ASSERT (l->lock && l->thread_id == thread_id);
+  thread_index = vlib_get_thread_index ();
+  ASSERT (l->lock && l->thread_index == thread_index);
   l->count--;
   if (l->count == 0)
     {
diff --git a/src/vpp/stats/stats.h b/src/vpp/stats/stats.h
index 118115be..024dc78e 100644
--- a/src/vpp/stats/stats.h
+++ b/src/vpp/stats/stats.h
@@ -30,7 +30,7 @@ typedef struct
 {
   volatile u32 lock;
   volatile u32 release_hint;
-  u32 thread_id;
+  u32 thread_index;
   u32 count;
   int tag;
 } data_structure_lock_t;