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122 lines
3.7 KiB
C
122 lines
3.7 KiB
C
/**
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* @file IxEthAccDBLocks_p.h
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*
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* @brief Definition of transaction lock stacks and lock utility macros
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*
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* @par
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* IXP400 SW Release version 2.0
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*
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* -- Copyright Notice --
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*
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* @par
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* Copyright 2001-2005, Intel Corporation.
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* All rights reserved.
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*
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* @par
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the Intel Corporation nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* @par
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS IS''
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @par
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* -- End of Copyright Notice --
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*/
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#ifndef IxEthAccDBLocks_p_H
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#define IxEthAccDBLocks_p_H
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#include "IxOsPrintf.h"
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/* Lock and lock stacks */
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typedef struct
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{
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IxOsalFastMutex* locks[MAX_LOCKS];
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UINT32 stackPointer, basePointer;
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} LockStack;
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#define TRY_LOCK(mutex) \
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{ \
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if (ixOsalFastMutexTryLock(mutex) != IX_SUCCESS) \
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{ \
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return IX_ETH_DB_BUSY; \
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} \
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}
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#define UNLOCK(mutex) { ixOsalFastMutexUnlock(mutex); }
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#define INIT_STACK(stack) \
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{ \
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(stack)->basePointer = 0; \
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(stack)->stackPointer = 0; \
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}
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#define PUSH_LOCK(stack, lock) \
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{ \
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if ((stack)->stackPointer == MAX_LOCKS) \
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{ \
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ERROR_LOG("Ethernet DB: maximum number of elements in a lock stack has been exceeded on push, heavy chaining?\n"); \
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UNROLL_STACK(stack); \
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\
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return IX_ETH_DB_NOMEM; \
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} \
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\
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if (ixOsalFastMutexTryLock(lock) == IX_SUCCESS) \
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{ \
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(stack)->locks[(stack)->stackPointer++] = (lock); \
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} \
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else \
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{ \
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UNROLL_STACK(stack); \
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\
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return IX_ETH_DB_BUSY; \
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} \
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}
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#define POP_LOCK(stack) \
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{ \
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ixOsalFastMutexUnlock((stack)->locks[--(stack)->stackPointer]); \
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}
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#define UNROLL_STACK(stack) \
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{ \
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while ((stack)->stackPointer > (stack)->basePointer) \
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{ \
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POP_LOCK(stack); \
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} \
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}
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#define SHIFT_STACK(stack) \
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{ \
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if ((stack)->basePointer == MAX_LOCKS - 1) \
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{ \
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ERROR_LOG("Ethernet DB: maximum number of elements in a lock stack has been exceeded on shift, heavy chaining?\n"); \
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UNROLL_STACK(stack); \
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\
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return IX_ETH_DB_BUSY; \
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} \
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\
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ixOsalFastMutexUnlock((stack)->locks[(stack)->basePointer++]); \
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}
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#endif /* IxEthAccDBLocks_p_H */
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