1 // Copyright (c) 2010 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. 4 5 #include "base/threading/platform_thread.h" 6 7 #import <Foundation/Foundation.h> 8 #include <dlfcn.h> 9 10 #include "base/logging.h" 11 12 namespace base { 13 14 // If Cocoa is to be used on more than one thread, it must know that the 15 // application is multithreaded. Since it's possible to enter Cocoa code 16 // from threads created by pthread_thread_create, Cocoa won't necessarily 17 // be aware that the application is multithreaded. Spawning an NSThread is 18 // enough to get Cocoa to set up for multithreaded operation, so this is done 19 // if necessary before pthread_thread_create spawns any threads. 20 // 21 // http://developer.apple.com/documentation/Cocoa/Conceptual/Multithreading/CreatingThreads/chapter_4_section_4.html 22 void InitThreading() { 23 static BOOL multithreaded = [NSThread isMultiThreaded]; 24 if (!multithreaded) { 25 // +[NSObject class] is idempotent. 26 [NSThread detachNewThreadSelector:@selector(class) 27 toTarget:[NSObject class] 28 withObject:nil]; 29 multithreaded = YES; 30 31 DCHECK([NSThread isMultiThreaded]); 32 } 33 } 34 35 // static 36 void PlatformThread::SetName(const char* name) { 37 // pthread_setname_np is only available in 10.6 or later, so test 38 // for it at runtime. 39 int (*dynamic_pthread_setname_np)(const char*); 40 *reinterpret_cast<void**>(&dynamic_pthread_setname_np) = 41 dlsym(RTLD_DEFAULT, "pthread_setname_np"); 42 if (!dynamic_pthread_setname_np) 43 return; 44 45 // Mac OS X does not expose the length limit of the name, so 46 // hardcode it. 47 const int kMaxNameLength = 63; 48 std::string shortened_name = std::string(name).substr(0, kMaxNameLength); 49 // pthread_setname() fails (harmlessly) in the sandbox, ignore when it does. 50 // See http://crbug.com/47058 51 dynamic_pthread_setname_np(shortened_name.c_str()); 52 } 53 54 } // namespace base 55
