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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
// 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.
// WARNING: You should *NOT* be using this class directly. PlatformThread is
// the low-level platform-specific abstraction to the OS's threading interface.
// You should instead be using a message-loop driven Thread, see thread.h.
#ifndef BASE_PLATFORM_THREAD_H_
#define BASE_PLATFORM_THREAD_H_
#include "base/basictypes.h"
// PlatformThreadHandle should not be assumed to be a numeric type, since the
// standard intends to allow pthread_t to be a structure. This means you
// should not initialize it to a value, like 0. If it's a member variable, the
// constructor can safely "value initialize" using () in the initializer list.
#if defined(XP_WIN)
# include <windows.h>
typedef DWORD PlatformThreadId;
typedef void* PlatformThreadHandle; // HANDLE
#else
# include <pthread.h>
typedef pthread_t PlatformThreadHandle;
# if defined(XP_LINUX) || defined(XP_OPENBSD) || defined(XP_SOLARIS) || \
defined(__GLIBC__)
# include <unistd.h>
typedef pid_t PlatformThreadId;
# elif defined(__DragonFly__) || defined(XP_FREEBSD) || defined(XP_NETBSD)
# include <sys/types.h>
typedef lwpid_t PlatformThreadId;
# elif defined(XP_DARWIN)
# include <mach/mach.h>
typedef mach_port_t PlatformThreadId;
# endif
#endif
// A namespace for low-level thread functions.
class PlatformThread {
public:
// Gets the current thread id, which may be useful for logging purposes.
static PlatformThreadId CurrentId();
// Yield the current thread so another thread can be scheduled.
static void YieldCurrentThread();
// Sleeps for the specified duration (units are milliseconds).
static void Sleep(int duration_ms);
// Sets the thread name visible to a debugger. This has no effect otherwise.
static void SetName(const char* name);
// Implement this interface to run code on a background thread. Your
// ThreadMain method will be called on the newly created thread.
class Delegate {
public:
virtual ~Delegate() {}
virtual void ThreadMain() = 0;
};
// Creates a new thread. The |stack_size| parameter can be 0 to indicate
// that the default stack size should be used. Upon success,
// |*thread_handle| will be assigned a handle to the newly created thread,
// and |delegate|'s ThreadMain method will be executed on the newly created
// thread.
// NOTE: When you are done with the thread handle, you must call Join to
// release system resources associated with the thread. You must ensure that
// the Delegate object outlives the thread.
static bool Create(size_t stack_size, Delegate* delegate,
PlatformThreadHandle* thread_handle);
// CreateNonJoinable() does the same thing as Create() except the thread
// cannot be Join()'d. Therefore, it also does not output a
// PlatformThreadHandle.
static bool CreateNonJoinable(size_t stack_size, Delegate* delegate);
// Joins with a thread created via the Create function. This function blocks
// the caller until the designated thread exits. This will invalidate
// |thread_handle|.
static void Join(PlatformThreadHandle thread_handle);
private:
DISALLOW_IMPLICIT_CONSTRUCTORS(PlatformThread);
};
#endif // BASE_PLATFORM_THREAD_H_
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