code review 12418043: net: add special netFD mutex

src/pkg/runtime/proc.c

 // Copyright 2009 The Go Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
 #include "runtime.h"
 #include "arch_GOARCH.h"
 #include "malloc.h"
 #include "stack.h"
 #include "race.h"
 #include "type.h"
@@ skipping 1818 matching lines @@
         if(n > MaxGomaxprocs)
                 n = MaxGomaxprocs;
         runtime·lock(&runtime·sched);
         ret = runtime·gomaxprocs;
         if(n <= 0 || n == ret) {
                 runtime·unlock(&runtime·sched);
                 return ret;
         }
         runtime·unlock(&runtime·sched);
 
-        runtime·semacquire(&runtime·worldsema);
+        runtime·semacquire(&runtime·worldsema, false);
         m->gcing = 1;
         runtime·stoptheworld();
         newprocs = n;
         m->gcing = 0;
         runtime·semrelease(&runtime·worldsema);
         runtime·starttheworld();
 
         return ret;
 }
 
@@ skipping 781 matching lines @@
 bool
 runtime·topofstack(Func *f)
 {
         return f->entry == (uintptr)runtime·goexit ||
                 f->entry == (uintptr)runtime·mstart ||
                 f->entry == (uintptr)runtime·mcall ||
                 f->entry == (uintptr)runtime·morestack ||
                 f->entry == (uintptr)runtime·lessstack ||
                 f->entry == (uintptr)_rt0_go;
 }