compile on openbsd: mostly ifdefs and missing includes,...

base/platform_thread_posix.cc

 // Copyright (c) 2006-2008 The Chromium 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 "base/platform_thread.h"
 
 #include <errno.h>
 #include <sched.h>
 
 #if defined(OS_MACOSX)
@@ skipping 17 matching lines @@
 }
 
 // static
 PlatformThreadId PlatformThread::CurrentId() {
   // Pthreads doesn't have the concept of a thread ID, so we have to reach down
   // into the kernel.
 #if defined(OS_MACOSX)
   return mach_thread_self();
 #elif defined(OS_LINUX)
   return syscall(__NR_gettid);
+#elif defined(OS_OPENBSD)
+  return (PlatformThreadId)pthread_self();
 #endif
 }
 
 // static
 void PlatformThread::YieldCurrentThread() {
   sched_yield();
 }
 
 // static
 void PlatformThread::Sleep(int duration_ms) {
@@ skipping 63 matching lines @@
 
   bool result = CreateThread(stack_size, false /* non-joinable thread */,
                              delegate, &unused);
   return result;
 }
 
 // static
 void PlatformThread::Join(PlatformThreadHandle thread_handle) {
   pthread_join(thread_handle, NULL);
 }