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// 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());
}
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