Update to NSPR 4.10.7 Beta 3.

nspr/pr/src/threads/prtpd.c

Index: nspr/pr/src/threads/prtpd.c
diff --git a/nspr/pr/src/threads/prtpd.c b/nspr/pr/src/threads/prtpd.c
index decbc1ccad30864a93e90150c45516a961292877..0eb2a011c62ab3a2fbd16bebf425cb0b6a49e13a 100644
--- a/nspr/pr/src/threads/prtpd.c
+++ b/nspr/pr/src/threads/prtpd.c
@@ -130,8 +130,9 @@ PR_IMPLEMENT(PRStatus) PR_NewThreadPrivateIndex(
 ** destructor function and a non-NULL per-thread-private data value,
 ** the destructor function is invoked.
 **
-** This can return PR_FAILURE if index is invalid (ie., beyond the current
-** high water mark) or memory is insufficient to allocate an exanded vector.
+** This can return PR_FAILURE if index is invalid (ie., beyond the limit
+** on the TPD slots) or memory is insufficient to allocate an expanded
+** vector.
 */
 
 PR_IMPLEMENT(PRStatus) PR_SetThreadPrivate(PRUintn index, void *priv)
@@ -139,11 +140,10 @@ PR_IMPLEMENT(PRStatus) PR_SetThreadPrivate(PRUintn index, void *priv)
     PRThread *self = PR_GetCurrentThread();
 
     /*
-    ** The index being set might not have a sufficient vector in this
-    ** thread. But if the index has been allocated, it's okay to go
-    ** ahead and extend this one now.
+    ** To improve performance, we don't check if the index has been
+    ** allocated.
     */
-    if ((index >= _PR_TPD_LIMIT) || (index >= _pr_tpd_highwater))
+    if (index >= _PR_TPD_LIMIT)
     {
         PR_SetError(PR_TPD_RANGE_ERROR, 0);
         return PR_FAILURE;
@@ -152,6 +152,10 @@ PR_IMPLEMENT(PRStatus) PR_SetThreadPrivate(PRUintn index, void *priv)
     PR_ASSERT(((NULL == self->privateData) && (0 == self->tpdLength))
         || ((NULL != self->privateData) && (0 != self->tpdLength)));
 
+    /*
+    ** If this thread does not have a sufficient vector for the index
+    ** being set, go ahead and extend this vector now.
+    */
     if ((NULL == self->privateData) || (self->tpdLength <= index))
     {
         void *extension = PR_CALLOC(_pr_tpd_length * sizeof(void*));