The Tor Browser: ipc/chromium/src/base/platform_thread

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

     1 // Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.

     2 // Use of this source code is governed by a BSD-style license that can be

     3 // found in the LICENSE file.

     5 #include "base/platform_thread.h"

     7 #import <Foundation/Foundation.h>

     8 #include <dlfcn.h>

    10 #include "base/logging.h"

    11 #include "base/scoped_nsautorelease_pool.h"

    13 // A simple class that demonstrates our impressive ability to do nothing.

    14 @interface NoOp : NSObject

    16 // Does the deed.  Or does it?

    17 + (void)noOp;

    19 @end

    21 @implementation NoOp

    23 + (void)noOp {

    24 }

    26 @end

    28 namespace base {

    30 // If Cocoa is to be used on more than one thread, it must know that the

    31 // application is multithreaded.  Since it's possible to enter Cocoa code

    32 // from threads created by pthread_thread_create, Cocoa won't necessarily

    33 // be aware that the application is multithreaded.  Spawning an NSThread is

    34 // enough to get Cocoa to set up for multithreaded operation, so this is done

    35 // if necessary before pthread_thread_create spawns any threads.

    36 //

    37 // http://developer.apple.com/documentation/Cocoa/Conceptual/Multithreading/CreatingThreads/chapter_4_section_4.html

    38 void InitThreading() {

    39   // this is called early in startup, before the event loop, so provide

    40   // an autorelease pool to prevent leaks here

    41   ScopedNSAutoreleasePool pool;

    43   static BOOL multithreaded = [NSThread isMultiThreaded];

    44   if (!multithreaded) {

    45     [NSThread detachNewThreadSelector:@selector(noOp)

    46                              toTarget:[NoOp class]

    47                            withObject:nil];

    48     multithreaded = YES;

    50     DCHECK([NSThread isMultiThreaded]);

    51   }

    52 }

    54 }  // namespace base

    56 // static

    57 void PlatformThread::SetName(const char* name) {

    58   // pthread_setname_np is only available in 10.6 or later, so test

    59   // for it at runtime.

    60   int (*dynamic_pthread_setname_np)(const char*);

    61   *reinterpret_cast<void**>(&dynamic_pthread_setname_np) =

    62       dlsym(RTLD_DEFAULT, "pthread_setname_np");

    63   if (!dynamic_pthread_setname_np)

    64     return;

    66   // Mac OS X does not expose the length limit of the name, so

    67   // hardcode it.

    68   const int kMaxNameLength = 63;

    69   std::string shortened_name = std::string(name).substr(0, kMaxNameLength);

    70   // pthread_setname() fails (harmlessly) in the sandbox, ignore when it does.

    71   // See http://crbug.com/47058

    73   // The name parameter is copied thus it's safe to release it after calling.

    74   // Checked against the bionic implementation in bionic/libc/bionic/pthread.c

    75   dynamic_pthread_setname_np(shortened_name.c_str());

    76 }

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