Function report

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:kernel\locking\rwsem.c Create Date:2022-07-28 09:48:25
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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Name:__down_read_trylock

Proto:static inline int __down_read_trylock(struct rw_semaphore *sem)

Type:int

Parameter:

TypeParameterName
struct rw_semaphore *sem
1372  tmp = RWSEM_UNLOCKED_VALUE
1373  Do
1374  If atomic_long_try_cmpxchg_acquire( & count, & tmp, tmp + RWSEM_READER_BIAS) Then
1376  rwsem_set_reader_owned(sem)
1377  Return 1
1379  When Not (tmp & RWSEM_READ_FAILED_MASK) cycle
1380  Return 0
Caller
NameDescribe
down_read_trylockrylock for reading -- returns 1 if successful, 0 if contention