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/**
* @file IxEthAccDBLocks_p.h
*
* @brief Definition of transaction lock stacks and lock utility macros
*
* @par
* IXP400 SW Release version 2.0
*
* -- Copyright Notice --
*
* @par
* Copyright 2001-2005, Intel Corporation.
* All rights reserved.
*
* @par
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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.
* 3. Neither the name of the Intel Corporation nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* @par
* 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.
*
* @par
* -- End of Copyright Notice --
*/
#ifndef IxEthAccDBLocks_p_H
#define IxEthAccDBLocks_p_H
#include "IxOsPrintf.h"
/* Lock and lock stacks */
typedef struct
{
IxOsalFastMutex* locks[MAX_LOCKS];
UINT32 stackPointer, basePointer;
} LockStack;
#define TRY_LOCK(mutex) \
{ \
if (ixOsalFastMutexTryLock(mutex) != IX_SUCCESS) \
{ \
return IX_ETH_DB_BUSY; \
} \
}
#define UNLOCK(mutex) { ixOsalFastMutexUnlock(mutex); }
#define INIT_STACK(stack) \
{ \
(stack)->basePointer = 0; \
(stack)->stackPointer = 0; \
}
#define PUSH_LOCK(stack, lock) \
{ \
if ((stack)->stackPointer == MAX_LOCKS) \
{ \
ERROR_LOG("Ethernet DB: maximum number of elements in a lock stack has been exceeded on push, heavy chaining?\n"); \
UNROLL_STACK(stack); \
\
return IX_ETH_DB_NOMEM; \
} \
\
if (ixOsalFastMutexTryLock(lock) == IX_SUCCESS) \
{ \
(stack)->locks[(stack)->stackPointer++] = (lock); \
} \
else \
{ \
UNROLL_STACK(stack); \
\
return IX_ETH_DB_BUSY; \
} \
}
#define POP_LOCK(stack) \
{ \
ixOsalFastMutexUnlock((stack)->locks[--(stack)->stackPointer]); \
}
#define UNROLL_STACK(stack) \
{ \
while ((stack)->stackPointer > (stack)->basePointer) \
{ \
POP_LOCK(stack); \
} \
}
#define SHIFT_STACK(stack) \
{ \
if ((stack)->basePointer == MAX_LOCKS - 1) \
{ \
ERROR_LOG("Ethernet DB: maximum number of elements in a lock stack has been exceeded on shift, heavy chaining?\n"); \
UNROLL_STACK(stack); \
\
return IX_ETH_DB_BUSY; \
} \
\
ixOsalFastMutexUnlock((stack)->locks[(stack)->basePointer++]); \
}
#endif /* IxEthAccDBLocks_p_H */
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