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/* -*- Mode: C; c-basic-offset:4 ; indent-tabs-mode:nil -*- */
/*
* Copyright (c) 2004-2005 The Trustees of Indiana University and Indiana
* University Research and Technology
* Corporation. All rights reserved.
* Copyright (c) 2004-2016 The University of Tennessee and The University
* of Tennessee Research Foundation. All rights
* reserved.
* Copyright (c) 2004-2005 High Performance Computing Center Stuttgart,
* University of Stuttgart. All rights reserved.
* Copyright (c) 2004-2005 The Regents of the University of California.
* All rights reserved.
* Copyright (c) 2007 Cisco Systems, Inc. All rights reserved.
* Copyright (c) 2007-2016 Los Alamos National Security, LLC. All rights
* reserved.
* Copyright (c) 2007 Voltaire. All rights reserved.
* Copyright (c) 2010 Oracle and/or its affiliates. All rights reserved.
*
* $COPYRIGHT$
*
* Additional copyrights may follow
*
* $HEADER$
*/
#ifndef OPAL_MUTEX_H
#define OPAL_MUTEX_H 1
#include "opal_config.h"
#include "opal/threads/thread_usage.h"
BEGIN_C_DECLS
/**
* @file:
*
* Mutual exclusion functions.
*
* Functions for locking of critical sections.
*/
/**
* Opaque mutex object
*/
typedef struct opal_mutex_t opal_mutex_t;
typedef struct opal_mutex_t opal_recursive_mutex_t;
/**
* Try to acquire a mutex.
*
* @param mutex Address of the mutex.
* @return 0 if the mutex was acquired, 1 otherwise.
*/
static inline int opal_mutex_trylock(opal_mutex_t *mutex);
/**
* Acquire a mutex.
*
* @param mutex Address of the mutex.
*/
static inline void opal_mutex_lock(opal_mutex_t *mutex);
/**
* Release a mutex.
*
* @param mutex Address of the mutex.
*/
static inline void opal_mutex_unlock(opal_mutex_t *mutex);
/**
* Try to acquire a mutex using atomic operations.
*
* @param mutex Address of the mutex.
* @return 0 if the mutex was acquired, 1 otherwise.
*/
static inline int opal_mutex_atomic_trylock(opal_mutex_t *mutex);
/**
* Acquire a mutex using atomic operations.
*
* @param mutex Address of the mutex.
*/
static inline void opal_mutex_atomic_lock(opal_mutex_t *mutex);
/**
* Release a mutex using atomic operations.
*
* @param mutex Address of the mutex.
*/
static inline void opal_mutex_atomic_unlock(opal_mutex_t *mutex);
END_C_DECLS
#include "mutex_unix.h"
BEGIN_C_DECLS
/**
* Lock a mutex if opal_using_threads() says that multiple threads may
* be active in the process.
*
* @param mutex Pointer to a opal_mutex_t to lock.
*
* If there is a possibility that multiple threads are running in the
* process (as determined by opal_using_threads()), this function will
* block waiting to lock the mutex.
*
* If there is no possibility that multiple threads are running in the
* process, return immediately.
*/
#define OPAL_THREAD_LOCK(mutex) \
do { \
if (OPAL_UNLIKELY(opal_using_threads())) { \
opal_mutex_lock(mutex); \
} \
} while (0)
/**
* Try to lock a mutex if opal_using_threads() says that multiple
* threads may be active in the process.
*
* @param mutex Pointer to a opal_mutex_t to trylock
*
* If there is a possibility that multiple threads are running in the
* process (as determined by opal_using_threads()), this function will
* trylock the mutex.
*
* If there is no possibility that multiple threads are running in the
* process, return immediately without modifying the mutex.
*
* Returns 0 if mutex was locked, non-zero otherwise.
*/
#define OPAL_THREAD_TRYLOCK(mutex) \
(OPAL_UNLIKELY(opal_using_threads()) ? opal_mutex_trylock(mutex) : 0)
/**
* Unlock a mutex if opal_using_threads() says that multiple threads
* may be active in the process.
*
* @param mutex Pointer to a opal_mutex_t to unlock.
*
* If there is a possibility that multiple threads are running in the
* process (as determined by opal_using_threads()), this function will
* unlock the mutex.
*
* If there is no possibility that multiple threads are running in the
* process, return immediately without modifying the mutex.
*/
#define OPAL_THREAD_UNLOCK(mutex) \
do { \
if (OPAL_UNLIKELY(opal_using_threads())) { \
opal_mutex_unlock(mutex); \
} \
} while (0)
/**
* Lock a mutex if opal_using_threads() says that multiple threads may
* be active in the process for the duration of the specified action.
*
* @param mutex Pointer to a opal_mutex_t to lock.
* @param action A scope over which the lock is held.
*
* If there is a possibility that multiple threads are running in the
* process (as determined by opal_using_threads()), this function will
* acquire the lock before invoking the specified action and release
* it on return.
*
* If there is no possibility that multiple threads are running in the
* process, invoke the action without acquiring the lock.
*/
#define OPAL_THREAD_SCOPED_LOCK(mutex, action) \
do { \
if(OPAL_UNLIKELY(opal_using_threads())) { \
opal_mutex_lock(mutex); \
action; \
opal_mutex_unlock(mutex); \
} else { \
action; \
} \
} while (0)
END_C_DECLS
#endif /* OPAL_MUTEX_H */
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