Author: hselasky
Date: Fri Feb 16 16:01:39 2018
New Revision: 329378
URL: https://svnweb.freebsd.org/changeset/base/329378
Log:
Implement mutex_trylock_recursive() in the LinuxKPI.
MFC after: 1 week
Submitted by: Johannes Lundberg <johal...@gmail.com>
Sponsored by: Mellanox Technologies
Modified:
head/sys/compat/linuxkpi/common/include/linux/mutex.h
Modified: head/sys/compat/linuxkpi/common/include/linux/mutex.h
==============================================================================
--- head/sys/compat/linuxkpi/common/include/linux/mutex.h Fri Feb 16
15:52:28 2018 (r329377)
+++ head/sys/compat/linuxkpi/common/include/linux/mutex.h Fri Feb 16
16:01:39 2018 (r329378)
@@ -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)
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