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/* Copyright (c) 2013, Linaro Limited
* All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#include <odp/api/rwlock_recursive.h>
#include <odp/api/thread.h>
#include <string.h>
#define NO_OWNER (-1)
void odp_rwlock_recursive_init(odp_rwlock_recursive_t *rlock)
{
memset(rlock, 0, sizeof(odp_rwlock_recursive_t));
odp_rwlock_init(&rlock->lock);
rlock->wr_owner = NO_OWNER;
}
/* Multiple readers can recurse the lock concurrently */
void odp_rwlock_recursive_read_lock(odp_rwlock_recursive_t *rlock)
{
int thr = odp_thread_id();
if (rlock->rd_cnt[thr]) {
rlock->rd_cnt[thr]++;
return;
}
odp_rwlock_read_lock(&rlock->lock);
rlock->rd_cnt[thr] = 1;
}
/* Multiple readers can recurse the lock concurrently */
int odp_rwlock_recursive_read_trylock(odp_rwlock_recursive_t *rlock)
{
int thr = odp_thread_id();
if (rlock->rd_cnt[thr]) {
rlock->rd_cnt[thr]++;
return 1;
}
if (odp_rwlock_read_trylock(&rlock->lock)) {
rlock->rd_cnt[thr] = 1;
return 1;
}
return 0;
}
void odp_rwlock_recursive_read_unlock(odp_rwlock_recursive_t *rlock)
{
int thr = odp_thread_id();
rlock->rd_cnt[thr]--;
if (rlock->rd_cnt[thr] > 0)
return;
odp_rwlock_read_unlock(&rlock->lock);
}
/* Only one writer can recurse the lock */
void odp_rwlock_recursive_write_lock(odp_rwlock_recursive_t *rlock)
{
int thr = odp_thread_id();
if (rlock->wr_owner == thr) {
rlock->wr_cnt++;
return;
}
odp_rwlock_write_lock(&rlock->lock);
rlock->wr_owner = thr;
rlock->wr_cnt = 1;
}
/* Only one writer can recurse the lock */
int odp_rwlock_recursive_write_trylock(odp_rwlock_recursive_t *rlock)
{
int thr = odp_thread_id();
if (rlock->wr_owner == thr) {
rlock->wr_cnt++;
return 1;
}
if (odp_rwlock_write_trylock(&rlock->lock)) {
rlock->wr_owner = thr;
rlock->wr_cnt = 1;
return 1;
}
return 0;
}
void odp_rwlock_recursive_write_unlock(odp_rwlock_recursive_t *rlock)
{
rlock->wr_cnt--;
if (rlock->wr_cnt > 0)
return;
rlock->wr_owner = NO_OWNER;
odp_rwlock_write_unlock(&rlock->lock);
}
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