trace_event support for thread names

base/threading/platform_thread_posix.cc

 // Copyright (c) 2011 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/threading/platform_thread.h"
 
 #include <errno.h>
 #include <sched.h>
 
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/safe_strerror_posix.h"
+#include "base/debug/trace_event.h"
 #include "base/threading/thread_restrictions.h"
 
 #if defined(OS_MACOSX)
 #include <mach/mach.h>
 #include <sys/resource.h>
 #include <algorithm>
 #endif
 
 #if defined(OS_LINUX)
 #include <dlfcn.h>
@@ skipping 122 matching lines @@
   sleep_time.tv_sec = duration_ms / 1000;
   duration_ms -= sleep_time.tv_sec * 1000;
 
   // Contains the portion of duration_ms < 1 sec.
   sleep_time.tv_nsec = duration_ms * 1000 * 1000;  // nanoseconds.
 
   while (nanosleep(&sleep_time, &remaining) == -1 && errno == EINTR)
     sleep_time = remaining;
 }
 
 // Linux SetName is currently disabled, as we need to distinguish between

[joth, 2011/07/26 09:53:17]

FWIW we should be able to distinguish the main thread from others by testing for
pid == tid.

 // helper threads (where it's ok to make this call) and the main thread
 // (where making this call renames our process, causing tools like killall
 // to stop working).

[joth, 2011/07/26 09:53:17]

we should be able to distinguish the main thread from others by testing for pid
== tid.

 #if 0 && defined(OS_LINUX)
 // static
 void PlatformThread::SetName(const char* name) {
+  base::debug::TraceLog::GetInstance()->SetCurrentThreadName(name);
+
   // http://0pointer.de/blog/projects/name-your-threads.html
 
   // glibc recently added support for pthread_setname_np, but it's not
   // commonly available yet.  So test for it at runtime.
   int (*dynamic_pthread_setname_np)(pthread_t, const char*);
   *reinterpret_cast<void**>(&dynamic_pthread_setname_np) =
       dlsym(RTLD_DEFAULT, "pthread_setname_np");
 
   if (dynamic_pthread_setname_np) {
     // This limit comes from glibc, which gets it from the kernel
@@ skipping 10 matching lines @@
     // truncated by the callee (see TASK_COMM_LEN above).)
     int err = prctl(PR_SET_NAME, name);
     if (err < 0)
       PLOG(ERROR) << "prctl(PR_SET_NAME)";
   }
 }
 #elif defined(OS_MACOSX)
 // Mac is implemented in platform_thread_mac.mm.
 #else
 // static
-void PlatformThread::SetName(const char* /*name*/) {
-  // Leave it unimplemented.
+void PlatformThread::SetName(const char* name) {
+  base::debug::TraceLog::GetInstance()->SetCurrentThreadName(name);
 
   // (This should be relatively simple to implement for the BSDs; I
   // just don't have one handy to test the code on.)
 }
 #endif  // defined(OS_LINUX)
 
 // static
 bool PlatformThread::Create(size_t stack_size, Delegate* delegate,
                             PlatformThreadHandle* thread_handle) {
   return CreateThread(stack_size, true /* joinable thread */,
@@ skipping 22 matching lines @@
 // Mac OS X uses lower-level mach APIs
 
 // static
 void PlatformThread::SetThreadPriority(PlatformThreadHandle, ThreadPriority) {
   // TODO(crogers): implement
   NOTIMPLEMENTED();
 }
 #endif
 
 }  // namespace base