mirror of
https://github.com/koverstreet/bcachefs-tools.git
synced 2025-02-23 00:00:02 +03:00
f5baaf48e3
This moves the Rust sources out of rust_src/ and into the top level. Running the bcachefs executable out of the development tree is now: $ ./target/release/bcachefs command or $ cargo run --profile release -- command instead of "./bcachefs command". Building and installing is still: $ make && make install Signed-off-by: Thomas Bertschinger <tahbertschinger@gmail.com> Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
45 lines
1.0 KiB
C
45 lines
1.0 KiB
C
#ifndef __LINUX_OSQ_LOCK_H
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#define __LINUX_OSQ_LOCK_H
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/*
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* An MCS like lock especially tailored for optimistic spinning for sleeping
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* lock implementations (mutex, rwsem, etc).
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*/
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struct optimistic_spin_node {
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struct optimistic_spin_node *next, *prev;
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int locked; /* 1 if lock acquired */
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int cpu; /* encoded CPU # + 1 value */
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};
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struct optimistic_spin_queue {
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/*
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* Stores an encoded value of the CPU # of the tail node in the queue.
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* If the queue is empty, then it's set to OSQ_UNLOCKED_VAL.
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*/
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atomic_t tail;
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};
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#define OSQ_UNLOCKED_VAL (0)
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/* Init macro and function. */
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#define OSQ_LOCK_UNLOCKED { ATOMIC_INIT(OSQ_UNLOCKED_VAL) }
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static inline void osq_lock_init(struct optimistic_spin_queue *lock)
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{
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atomic_set(&lock->tail, OSQ_UNLOCKED_VAL);
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}
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static inline bool osq_lock(struct optimistic_spin_queue *lock)
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{
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return false;
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}
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static inline void osq_unlock(struct optimistic_spin_queue *lock) {}
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static inline bool osq_is_locked(struct optimistic_spin_queue *lock)
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{
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return atomic_read(&lock->tail) != OSQ_UNLOCKED_VAL;
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}
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#endif
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