diff options
Diffstat (limited to 'src/dpdk22/lib/librte_eal/common/include/generic/rte_rwlock.h')
| -rw-r--r-- | src/dpdk22/lib/librte_eal/common/include/generic/rte_rwlock.h | 208 |
1 files changed, 0 insertions, 208 deletions
diff --git a/src/dpdk22/lib/librte_eal/common/include/generic/rte_rwlock.h b/src/dpdk22/lib/librte_eal/common/include/generic/rte_rwlock.h deleted file mode 100644 index 7a0fdc55..00000000 --- a/src/dpdk22/lib/librte_eal/common/include/generic/rte_rwlock.h +++ /dev/null @@ -1,208 +0,0 @@ -/*- - * BSD LICENSE - * - * Copyright(c) 2010-2014 Intel Corporation. All rights reserved. - * All rights reserved. - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * - * * Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * * 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. - * * Neither the name of 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. - * - * 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. - */ - -#ifndef _RTE_RWLOCK_H_ -#define _RTE_RWLOCK_H_ - -/** - * @file - * - * RTE Read-Write Locks - * - * This file defines an API for read-write locks. The lock is used to - * protect data that allows multiple readers in parallel, but only - * one writer. All readers are blocked until the writer is finished - * writing. - * - */ - -#ifdef __cplusplus -extern "C" { -#endif - -#include <rte_common.h> -#include <rte_atomic.h> - -/** - * The rte_rwlock_t type. - * - * cnt is -1 when write lock is held, and > 0 when read locks are held. - */ -typedef struct { - volatile int32_t cnt; /**< -1 when W lock held, > 0 when R locks held. */ -} rte_rwlock_t; - -/** - * A static rwlock initializer. - */ -#define RTE_RWLOCK_INITIALIZER { 0 } - -/** - * Initialize the rwlock to an unlocked state. - * - * @param rwl - * A pointer to the rwlock structure. - */ -static inline void -rte_rwlock_init(rte_rwlock_t *rwl) -{ - rwl->cnt = 0; -} - -/** - * Take a read lock. Loop until the lock is held. - * - * @param rwl - * A pointer to a rwlock structure. - */ -static inline void -rte_rwlock_read_lock(rte_rwlock_t *rwl) -{ - int32_t x; - int success = 0; - - while (success == 0) { - x = rwl->cnt; - /* write lock is held */ - if (x < 0) { - rte_pause(); - continue; - } - success = rte_atomic32_cmpset((volatile uint32_t *)&rwl->cnt, - x, x + 1); - } -} - -/** - * Release a read lock. - * - * @param rwl - * A pointer to the rwlock structure. - */ -static inline void -rte_rwlock_read_unlock(rte_rwlock_t *rwl) -{ - rte_atomic32_dec((rte_atomic32_t *)(intptr_t)&rwl->cnt); -} - -/** - * Take a write lock. Loop until the lock is held. - * - * @param rwl - * A pointer to a rwlock structure. - */ -static inline void -rte_rwlock_write_lock(rte_rwlock_t *rwl) -{ - int32_t x; - int success = 0; - - while (success == 0) { - x = rwl->cnt; - /* a lock is held */ - if (x != 0) { - rte_pause(); - continue; - } - success = rte_atomic32_cmpset((volatile uint32_t *)&rwl->cnt, - 0, -1); - } -} - -/** - * Release a write lock. - * - * @param rwl - * A pointer to a rwlock structure. - */ -static inline void -rte_rwlock_write_unlock(rte_rwlock_t *rwl) -{ - rte_atomic32_inc((rte_atomic32_t *)(intptr_t)&rwl->cnt); -} - -/** - * Try to execute critical section in a hardware memory transaction, if it - * fails or not available take a read lock - * - * NOTE: An attempt to perform a HW I/O operation inside a hardware memory - * transaction always aborts the transaction since the CPU is not able to - * roll-back should the transaction fail. Therefore, hardware transactional - * locks are not advised to be used around rte_eth_rx_burst() and - * rte_eth_tx_burst() calls. - * - * @param rwl - * A pointer to a rwlock structure. - */ -static inline void -rte_rwlock_read_lock_tm(rte_rwlock_t *rwl); - -/** - * Commit hardware memory transaction or release the read lock if the lock is used as a fall-back - * - * @param rwl - * A pointer to the rwlock structure. - */ -static inline void -rte_rwlock_read_unlock_tm(rte_rwlock_t *rwl); - -/** - * Try to execute critical section in a hardware memory transaction, if it - * fails or not available take a write lock - * - * NOTE: An attempt to perform a HW I/O operation inside a hardware memory - * transaction always aborts the transaction since the CPU is not able to - * roll-back should the transaction fail. Therefore, hardware transactional - * locks are not advised to be used around rte_eth_rx_burst() and - * rte_eth_tx_burst() calls. - * - * @param rwl - * A pointer to a rwlock structure. - */ -static inline void -rte_rwlock_write_lock_tm(rte_rwlock_t *rwl); - -/** - * Commit hardware memory transaction or release the write lock if the lock is used as a fall-back - * - * @param rwl - * A pointer to a rwlock structure. - */ -static inline void -rte_rwlock_write_unlock_tm(rte_rwlock_t *rwl); - -#ifdef __cplusplus -} -#endif - -#endif /* _RTE_RWLOCK_H_ */ |