implement Mutex and Condition with pthread instead of calling futex directly.

/*

 * Copyright (C) 2008 The Android Open Source Project

 *

 * Licensed under the Apache License, Version 2.0 (the "License");

 * you may not use this file except in compliance with the License.

 * You may obtain a copy of the License at

 *

 *      http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 */

#ifndef _FUTEX_SYNCHRO_H

#define _FUTEX_SYNCHRO_H

#ifndef HAVE_FUTEX

#error "HAVE_FUTEX not defined"

#endif

#define FUTEX_WAIT_INFINITE (0)

typedef struct futex_mutex_t futex_mutex_t;

struct futex_mutex_t 

{

    volatile int value;

};

typedef struct futex_cond_t futex_cond_t;

struct futex_cond_t 

{

    volatile int value;

};

#if __cplusplus

extern "C" {

#endif

void futex_mutex_init(futex_mutex_t *m);

int futex_mutex_lock(futex_mutex_t *m, unsigned msec);

void futex_mutex_unlock(futex_mutex_t *m);

int futex_mutex_trylock(futex_mutex_t *m);

void futex_cond_init(futex_cond_t *c);

int futex_cond_wait(futex_cond_t *c, futex_mutex_t *m, unsigned msec);

void futex_cond_signal(futex_cond_t *c);

void futex_cond_broadcast(futex_cond_t *c);

#if __cplusplus

} // extern "C"

#endif

#endif // _FUTEX_SYNCHRO_H