Implement mutex_trylock_recursive() in the LinuxKPI.
MFC after: 1 week Submitted by: Johannes Lundberg <johalun0@gmail.com> Sponsored by: Mellanox Technologies
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svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=329378
@ -77,6 +77,21 @@ typedef struct mutex {
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!!sx_try_xlock(&(_m)->sx); \
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})
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enum mutex_trylock_recursive_enum {
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MUTEX_TRYLOCK_FAILED = 0,
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MUTEX_TRYLOCK_SUCCESS = 1,
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MUTEX_TRYLOCK_RECURSIVE = 2,
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};
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static inline __must_check enum mutex_trylock_recursive_enum
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mutex_trylock_recursive(struct mutex *lock)
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{
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if (unlikely(sx_xholder(&lock->sx) == curthread))
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return (MUTEX_TRYLOCK_RECURSIVE);
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return (mutex_trylock(lock));
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}
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#define mutex_init(_m) \
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linux_mutex_init(_m, mutex_name(#_m), SX_NOWITNESS)
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