code review 12418043: net: add special netFD mutex

src/pkg/runtime/runtime.h

 // 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.
 
 /*
  * basic types
  */
 typedef signed char             int8;
 typedef unsigned char           uint8;
 typedef signed short            int16;
@@ skipping 1003 matching lines @@
 float64 runtime·NaN(void);
 float32 runtime·float32frombits(uint32 i);
 uint32  runtime·float32tobits(float32 f);
 float64 runtime·float64frombits(uint64 i);
 uint64  runtime·float64tobits(float64 f);
 float64 runtime·frexp(float64 d, int32 *ep);
 bool    runtime·isInf(float64 f, int32 sign);
 bool    runtime·isNaN(float64 f);
 float64 runtime·ldexp(float64 d, int32 e);
 float64 runtime·modf(float64 d, float64 *ip);
-void    runtime·semacquire(uint32*);
+void    runtime·semacquire(uint32*, bool);
 void    runtime·semrelease(uint32*);
 int32   runtime·gomaxprocsfunc(int32 n);
 void    runtime·procyield(uint32);
 void    runtime·osyield(void);
 void    runtime·lockOSThread(void);
 void    runtime·unlockOSThread(void);
 
 void    runtime·mapassign(MapType*, Hmap*, byte*, byte*);
 void    runtime·mapaccess(MapType*, Hmap*, byte*, byte*, bool*);
 void    runtime·mapiternext(struct hash_iter*);
@@ skipping 16 matching lines @@
 extern float64 runtime·neginf;
 extern uint64 ·nan;
 extern uint64 ·posinf;
 extern uint64 ·neginf;
 #define ISNAN(f) ((f) != (f))
 
 enum
 {
         UseSpanType = 1,
 };