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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 */