1 files changed, 77 insertions, 0 deletions
diff --git a/ipc/chromium/src/base/platform_thread_mac.mm b/ipc/chromium/src/base/platform_thread_mac.mm
new file mode 100644
index 000000000..ef558a796
--- /dev/null
+++ b/ipc/chromium/src/base/platform_thread_mac.mm
@@ -0,0 +1,77 @@
+// 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"
+
+#import <Foundation/Foundation.h>
+#include <dlfcn.h>
+
+#include "base/logging.h"
+#include "base/scoped_nsautorelease_pool.h"
+
+// A simple class that demonstrates our impressive ability to do nothing.
+@interface NoOp : NSObject
+
+// Does the deed.  Or does it?
++ (void)noOp;
+
+@end
+
+@implementation NoOp
+
++ (void)noOp {
+}
+
+@end
+
+namespace base {
+
+// If Cocoa is to be used on more than one thread, it must know that the
+// application is multithreaded.  Since it's possible to enter Cocoa code
+// from threads created by pthread_thread_create, Cocoa won't necessarily
+// be aware that the application is multithreaded.  Spawning an NSThread is
+// enough to get Cocoa to set up for multithreaded operation, so this is done
+// if necessary before pthread_thread_create spawns any threads.
+//
+// http://developer.apple.com/documentation/Cocoa/Conceptual/Multithreading/CreatingThreads/chapter_4_section_4.html
+void InitThreading() {
+  // this is called early in startup, before the event loop, so provide
+  // an autorelease pool to prevent leaks here
+  ScopedNSAutoreleasePool pool;
+
+  static BOOL multithreaded = [NSThread isMultiThreaded];
+  if (!multithreaded) {
+    [NSThread detachNewThreadSelector:@selector(noOp)
+                             toTarget:[NoOp class]
+                           withObject:nil];
+    multithreaded = YES;
+
+    DCHECK([NSThread isMultiThreaded]);
+  }
+}
+
+}  // namespace base
+
+// static
+void PlatformThread::SetName(const char* name) {
+  // pthread_setname_np is only available in 10.6 or later, so test
+  // for it at runtime.
+  int (*dynamic_pthread_setname_np)(const char*);
+  *reinterpret_cast<void**>(&dynamic_pthread_setname_np) =
+      dlsym(RTLD_DEFAULT, "pthread_setname_np");
+  if (!dynamic_pthread_setname_np)
+    return;
+
+  // Mac OS X does not expose the length limit of the name, so
+  // hardcode it.
+  const int kMaxNameLength = 63;
+  std::string shortened_name = std::string(name).substr(0, kMaxNameLength);
+  // pthread_setname() fails (harmlessly) in the sandbox, ignore when it does.
+  // See http://crbug.com/47058
+
+  // The name parameter is copied thus it's safe to release it after calling.
+  // Checked against the bionic implementation in bionic/libc/bionic/pthread.c
+  dynamic_pthread_setname_np(shortened_name.c_str());
+}
+