code review 12418043: net: add special netFD mutex

src/pkg/runtime/mprof.goc

 // 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.
 
 // Malloc profiling.
 // Patterned after tcmalloc's algorithms; shorter code.
 
 package runtime
 #include "runtime.h"
 #include "arch_GOARCH.h"
@@ skipping 429 matching lines @@
         }
 }
 
 func Stack(b Slice, all bool) (n int) {
         uintptr pc, sp;
 ········
         sp = runtime·getcallersp(&b);
         pc = (uintptr)runtime·getcallerpc(&b);
 
         if(all) {
-                runtime·semacquire(&runtime·worldsema);
+                runtime·semacquire(&runtime·worldsema, false);
                 m->gcing = 1;
                 runtime·stoptheworld();
         }
 
         if(b.len == 0)
                 n = 0;
         else{
                 g->writebuf = (byte*)b.array;
                 g->writenbuf = b.len;
                 runtime·goroutineheader(g);
@@ skipping 26 matching lines @@
         uintptr pc, sp;
         TRecord *r;
         G *gp;
 ········
         sp = runtime·getcallersp(&b);
         pc = (uintptr)runtime·getcallerpc(&b);
 ········
         ok = false;
         n = runtime·gcount();
         if(n <= b.len) {
-                runtime·semacquire(&runtime·worldsema);
+                runtime·semacquire(&runtime·worldsema, false);
                 m->gcing = 1;
                 runtime·stoptheworld();
 
                 n = runtime·gcount();
                 if(n <= b.len) {
                         ok = true;
                         r = (TRecord*)b.array;
                         saveg(pc, sp, g, r++);
                         for(gp = runtime·allg; gp != nil; gp = gp->alllink) {
                                 if(gp == g || gp->status == Gdead)
                                         continue;
                                 saveg(gp->sched.pc, gp->sched.sp, gp, r++);
                         }
                 }
 ········
                 m->gcing = 0;
                 runtime·semrelease(&runtime·worldsema);
                 runtime·starttheworld();
         }
 }
 
 void
 runtime·mprofinit(void)
 {
         addrhash = runtime·persistentalloc((1<<AddrHashBits)*sizeof *addrhash, 0);
 }