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| author | Zhihao Cheng <chengzhihao1@huawei.com> | 2024-11-11 16:36:49 +0800 |
|---|---|---|
| committer | David Oberhollenzer <david.oberhollenzer@sigma-star.at> | 2024-11-11 10:32:45 +0100 |
| commit | 71354a4b25aa3f54ed214fc80638e34d3befa977 (patch) | |
| tree | 0619fa1878579e15cddbd24d021c145980100c9f /ubifs-utils/common | |
| parent | 2ac0a0ef95f731c75c8dd6f17ffd947000e7d61c (diff) | |
ubifs-utils: Add rwsem implementations
Add rwsem implementations, because there are some rwsems
(eg. c->commit_sem) used in UBIFS linux kernel libs.
The rwsem is implemented based on pthread mutex.
This is a preparation for replacing implementation of UBIFS utils with
linux kernel libs.
Signed-off-by: Zhihao Cheng <chengzhihao1@huawei.com>
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
Diffstat (limited to 'ubifs-utils/common')
| -rw-r--r-- | ubifs-utils/common/rwsem.h | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/ubifs-utils/common/rwsem.h b/ubifs-utils/common/rwsem.h new file mode 100644 index 0000000..3761724 --- /dev/null +++ b/ubifs-utils/common/rwsem.h @@ -0,0 +1,19 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef __LINUX_RWSEM_H_ +#define __LINUX_RWSEM_H_ + +#include <pthread.h> + +struct rw_semaphore { + pthread_mutex_t lock; +}; + +#define init_rwsem(x) pthread_mutex_init(&(x)->lock, NULL) + +#define down_read(x) pthread_mutex_lock(&(x)->lock) +#define down_write(x) pthread_mutex_lock(&(x)->lock) +#define up_read(x) pthread_mutex_unlock(&(x)->lock) +#define up_write(x) pthread_mutex_unlock(&(x)->lock) +#define down_write_trylock(x) (pthread_mutex_trylock(&(x)->lock) == 0) + +#endif |