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Implement mutex_trylock_recursive() in the LinuxKPI.

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MFC after:	1 week
Submitted by:	Johannes Lundberg <johalun0@gmail.com>
Sponsored by:	Mellanox Technologies
This commit is contained in:
Hans Petter Selasky 2018-02-16 16:01:39 +00:00
parent 10ee3d3016
commit f4824a028d
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=329378
1 changed files with 15 additions and 0 deletions
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15
sys/compat/linuxkpi/common/include/linux/mutex.h
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@ -77,6 +77,21 @@ typedef struct mutex {
!!sx_try_xlock(&(_m)->sx); \
})
enum mutex_trylock_recursive_enum {
MUTEX_TRYLOCK_FAILED = 0,
MUTEX_TRYLOCK_SUCCESS = 1,
MUTEX_TRYLOCK_RECURSIVE = 2,
};
static inline __must_check enum mutex_trylock_recursive_enum
mutex_trylock_recursive(struct mutex *lock)
{
if (unlikely(sx_xholder(&lock->sx) == curthread))
return (MUTEX_TRYLOCK_RECURSIVE);
return (mutex_trylock(lock));
}
#define mutex_init(_m) \
linux_mutex_init(_m, mutex_name(#_m), SX_NOWITNESS)