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// Copyright 2008, Google Inc.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#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(OS_WIN)
typedef void* PlatformThreadHandle; // HANDLE
#elif defined(OS_POSIX)
#include <pthread.h>
typedef pthread_t PlatformThreadHandle;
#endif
// A namespace for low-level thread functions.
class PlatformThread {
public:
// Gets the current thread id, which may be useful for logging purposes.
static int 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.
// To set the name of the current thread, pass PlatformThread::CurrentId() as
// the thread_id parameter.
static void SetName(int thread_id, 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);
// 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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