code review 7389043: runtime: split minit() to mpreinit() and minit()

src/pkg/runtime/thread_windows.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 "type.h"
 #include "defs_GOOS_GOARCH.h"
 #include "os_GOOS.h"
 
 #pragma dynimport runtime·CloseHandle CloseHandle "kernel32.dll"
@@ skipping 188 matching lines @@
                 nil, (uintptr)0x20000, runtime·tstart_stdcall, mp,
                 STACK_SIZE_PARAM_IS_A_RESERVATION, nil);
         if(thandle == nil) {
                 runtime·printf("runtime: failed to create new OS thread (have %d already; errno=%d)\n", runtime·mcount(), runtime·getlasterror());
                 runtime·throw("runtime.newosproc");
         }
         runtime·atomicstorep(&mp->thread, thandle);
 }
 
 // Called to initialize a new m (including the bootstrap m).
+// Called on the parent thread (main thread in case of bootstrap), can allocate memory.
+void
+runtime·mpreinit(M *mp)
+{
+        USED(mp);
+}
+
+// Called to initialize a new m (including the bootstrap m).
+// Called on the new thread, can not allocate memory.
 void
 runtime·minit(void)
 {
         runtime·install_exception_handler();
 }
 
 // Called from dropm to undo the effect of an minit.
 void
 runtime·unminit(void)
 {
@@ skipping 211 matching lines @@
 runtime·setprof(bool on)
 {
         USED(on);
 }
 
 int8 runtime·badcallbackmsg[] = "runtime: cgo callback on thread not created by Go.\n";
 int32 runtime·badcallbacklen = sizeof runtime·badcallbackmsg - 1;
 
 int8 runtime·badsignalmsg[] = "runtime: signal received on thread not created by Go.\n";
 int32 runtime·badsignallen = sizeof runtime·badsignalmsg - 1;