1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/ipc/chromium/src/base/platform_thread_mac.mm Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,77 @@
1.4 +// Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
1.5 +// Use of this source code is governed by a BSD-style license that can be
1.6 +// found in the LICENSE file.
1.7 +
1.8 +#include "base/platform_thread.h"
1.9 +
1.10 +#import <Foundation/Foundation.h>
1.11 +#include <dlfcn.h>
1.12 +
1.13 +#include "base/logging.h"
1.14 +#include "base/scoped_nsautorelease_pool.h"
1.15 +
1.16 +// A simple class that demonstrates our impressive ability to do nothing.
1.17 +@interface NoOp : NSObject
1.18 +
1.19 +// Does the deed. Or does it?
1.20 ++ (void)noOp;
1.21 +
1.22 +@end
1.23 +
1.24 +@implementation NoOp
1.25 +
1.26 ++ (void)noOp {
1.27 +}
1.28 +
1.29 +@end
1.30 +
1.31 +namespace base {
1.32 +
1.33 +// If Cocoa is to be used on more than one thread, it must know that the
1.34 +// application is multithreaded. Since it's possible to enter Cocoa code
1.35 +// from threads created by pthread_thread_create, Cocoa won't necessarily
1.36 +// be aware that the application is multithreaded. Spawning an NSThread is
1.37 +// enough to get Cocoa to set up for multithreaded operation, so this is done
1.38 +// if necessary before pthread_thread_create spawns any threads.
1.39 +//
1.40 +// http://developer.apple.com/documentation/Cocoa/Conceptual/Multithreading/CreatingThreads/chapter_4_section_4.html
1.41 +void InitThreading() {
1.42 + // this is called early in startup, before the event loop, so provide
1.43 + // an autorelease pool to prevent leaks here
1.44 + ScopedNSAutoreleasePool pool;
1.45 +
1.46 + static BOOL multithreaded = [NSThread isMultiThreaded];
1.47 + if (!multithreaded) {
1.48 + [NSThread detachNewThreadSelector:@selector(noOp)
1.49 + toTarget:[NoOp class]
1.50 + withObject:nil];
1.51 + multithreaded = YES;
1.52 +
1.53 + DCHECK([NSThread isMultiThreaded]);
1.54 + }
1.55 +}
1.56 +
1.57 +} // namespace base
1.58 +
1.59 +// static
1.60 +void PlatformThread::SetName(const char* name) {
1.61 + // pthread_setname_np is only available in 10.6 or later, so test
1.62 + // for it at runtime.
1.63 + int (*dynamic_pthread_setname_np)(const char*);
1.64 + *reinterpret_cast<void**>(&dynamic_pthread_setname_np) =
1.65 + dlsym(RTLD_DEFAULT, "pthread_setname_np");
1.66 + if (!dynamic_pthread_setname_np)
1.67 + return;
1.68 +
1.69 + // Mac OS X does not expose the length limit of the name, so
1.70 + // hardcode it.
1.71 + const int kMaxNameLength = 63;
1.72 + std::string shortened_name = std::string(name).substr(0, kMaxNameLength);
1.73 + // pthread_setname() fails (harmlessly) in the sandbox, ignore when it does.
1.74 + // See http://crbug.com/47058
1.75 +
1.76 + // The name parameter is copied thus it's safe to release it after calling.
1.77 + // Checked against the bionic implementation in bionic/libc/bionic/pthread.c
1.78 + dynamic_pthread_setname_np(shortened_name.c_str());
1.79 +}
1.80 +
