DPDK 22.11.6
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#include <errno.h>
#include <rte_branch_prediction.h>
#include <rte_common.h>
#include <rte_pause.h>
Go to the source code of this file.
Macros | |
#define | RTE_RWLOCK_WAIT 0x1 /* Writer is waiting */ |
#define | RTE_RWLOCK_INITIALIZER { 0 } |
Functions | |
static void | rte_rwlock_init (rte_rwlock_t *rwl) |
static void | rte_rwlock_read_lock (rte_rwlock_t *rwl) |
static int | rte_rwlock_read_trylock (rte_rwlock_t *rwl) |
static void | rte_rwlock_read_unlock (rte_rwlock_t *rwl) |
static int | rte_rwlock_write_trylock (rte_rwlock_t *rwl) |
static void | rte_rwlock_write_lock (rte_rwlock_t *rwl) |
static void | rte_rwlock_write_unlock (rte_rwlock_t *rwl) |
static void | rte_rwlock_read_lock_tm (rte_rwlock_t *rwl) |
static void | rte_rwlock_read_unlock_tm (rte_rwlock_t *rwl) |
static void | rte_rwlock_write_lock_tm (rte_rwlock_t *rwl) |
static void | rte_rwlock_write_unlock_tm (rte_rwlock_t *rwl) |
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.
This version does not give preference to readers or writers and does not starve either readers or writers.
See also: https://locklessinc.com/articles/locks/
Definition in file rte_rwlock.h.
#define RTE_RWLOCK_WAIT 0x1 /* Writer is waiting */ |
The rte_rwlock_t type.
Readers increment the counter by RTE_RWLOCK_READ (4) Writers set the RTE_RWLOCK_WRITE bit when lock is held and set the RTE_RWLOCK_WAIT bit while waiting.
31 2 1 0 +----------------—+-+-+ | readers | | | +----------------—+-+-+ ^ ^ | | WRITE: lock held -—/ | WAIT: writer pending –/
Definition at line 52 of file rte_rwlock.h.
#define RTE_RWLOCK_INITIALIZER { 0 } |
A static rwlock initializer.
Definition at line 65 of file rte_rwlock.h.
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inlinestatic |
Initialize the rwlock to an unlocked state.
rwl | A pointer to the rwlock structure. |
Definition at line 74 of file rte_rwlock.h.
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inlinestatic |
Take a read lock. Loop until the lock is held.
rwl | A pointer to a rwlock structure. |
Definition at line 90 of file rte_rwlock.h.
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inlinestatic |
Try to take a read lock.
rwl | A pointer to a rwlock structure. |
Definition at line 125 of file rte_rwlock.h.
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inlinestatic |
Release a read lock.
rwl | A pointer to the rwlock structure. |
Definition at line 156 of file rte_rwlock.h.
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inlinestatic |
Try to take a write lock.
rwl | A pointer to a rwlock structure. |
Definition at line 172 of file rte_rwlock.h.
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inlinestatic |
Take a write lock. Loop until the lock is held.
rwl | A pointer to a rwlock structure. |
Definition at line 192 of file rte_rwlock.h.
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inlinestatic |
Release a write lock.
rwl | A pointer to a rwlock structure. |
Definition at line 225 of file rte_rwlock.h.
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inlinestatic |
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.
rwl | A pointer to a rwlock structure. |
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inlinestatic |
Commit hardware memory transaction or release the read lock if the lock is used as a fall-back
rwl | A pointer to the rwlock structure. |
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inlinestatic |
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.
rwl | A pointer to a rwlock structure. |
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inlinestatic |
Commit hardware memory transaction or release the write lock if the lock is used as a fall-back
rwl | A pointer to a rwlock structure. |