96 lines
2.1 KiB
C
96 lines
2.1 KiB
C
#pragma once
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#include <inttypes.h>
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#include <stddef.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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typedef int (*spin_worker)();
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/* Begin C API */
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struct fastlock;
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void fastlock_init(struct fastlock *lock, const char *name);
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#ifdef __cplusplus
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void fastlock_lock(struct fastlock *lock, spin_worker worker = nullptr);
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#else
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void fastlock_lock(struct fastlock *lock, spin_worker worker);
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#endif
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int fastlock_trylock(struct fastlock *lock, int fWeak);
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void fastlock_unlock(struct fastlock *lock);
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void fastlock_free(struct fastlock *lock);
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int fastlock_unlock_recursive(struct fastlock *lock);
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void fastlock_lock_recursive(struct fastlock *lock, int nesting);
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void fastlock_auto_adjust_waits();
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uint64_t fastlock_getlongwaitcount(); // this is a global value
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/* End C API */
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#ifdef __cplusplus
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}
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#endif
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#pragma GCC diagnostic push
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#pragma GCC diagnostic ignored "-Wpedantic"
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struct ticket
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{
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union
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{
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struct
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{
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uint16_t m_active;
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uint16_t m_avail;
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};
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unsigned u;
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};
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};
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#pragma GCC diagnostic pop
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struct fastlock
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{
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volatile int m_pidOwner;
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volatile int m_depth;
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char szName[56];
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/* Volatile data on seperate cache line */
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volatile struct ticket m_ticket;
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unsigned futex;
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char padding[56]; // ensure ticket and futex are on their own independent cache line
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#ifdef __cplusplus
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fastlock(const char *name)
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{
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fastlock_init(this, name);
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}
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inline void lock(spin_worker worker = nullptr)
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{
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fastlock_lock(this, worker);
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}
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inline bool try_lock(bool fWeak = false)
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{
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return !!fastlock_trylock(this, fWeak);
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}
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inline void unlock()
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{
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fastlock_unlock(this);
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}
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int unlock_recursive()
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{
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return fastlock_unlock_recursive(this);
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}
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void lock_recursive(int nesting)
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{
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fastlock_lock_recursive(this, nesting);
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}
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bool fOwnLock(); // true if this thread owns the lock, NOTE: not 100% reliable, use for debugging only
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#endif
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};
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#ifdef __cplusplus
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static_assert(offsetof(struct fastlock, m_ticket) == 64, "ensure padding is correct");
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#endif |