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2ff501590b
Also performed an initial run through of upgrading our Copyright date to extend to 2005 ... first run here was very simple ... change everything where: grep 1996-2004 && the word 'Copyright' ... scanned through the generated list with 'less' first, and after, to make sure that I only picked up the right entries ...
78 lines
2.2 KiB
C
78 lines
2.2 KiB
C
/*-------------------------------------------------------------------------
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*
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* spin.h
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* Hardware-independent implementation of spinlocks.
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*
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*
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* The hardware-independent interface to spinlocks is defined by the
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* typedef "slock_t" and these macros:
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*
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* void SpinLockInit(slock_t *lock)
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* Initialize a spinlock (to the unlocked state).
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*
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* void SpinLockAcquire(slock_t *lock)
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* Acquire a spinlock, waiting if necessary.
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* Time out and abort() if unable to acquire the lock in a
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* "reasonable" amount of time --- typically ~ 1 minute.
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* Cancel/die interrupts are held off until the lock is released.
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*
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* void SpinLockRelease(slock_t *lock)
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* Unlock a previously acquired lock.
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* Release the cancel/die interrupt holdoff.
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*
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* void SpinLockAcquire_NoHoldoff(slock_t *lock)
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* void SpinLockRelease_NoHoldoff(slock_t *lock)
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* Same as above, except no interrupt holdoff processing is done.
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* This pair of macros may be used when there is a surrounding
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* interrupt holdoff.
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*
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* bool SpinLockFree(slock_t *lock)
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* Tests if the lock is free. Returns TRUE if free, FALSE if locked.
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* This does *not* change the state of the lock.
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*
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* Callers must beware that the macro argument may be evaluated multiple
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* times!
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*
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* The macros are implemented in terms of hardware-dependent macros
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* supplied by s_lock.h.
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*
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*
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* Portions Copyright (c) 1996-2005, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* $PostgreSQL: pgsql/src/include/storage/spin.h,v 1.25 2004/12/31 22:03:42 pgsql Exp $
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef SPIN_H
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#define SPIN_H
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#include "storage/s_lock.h"
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#include "miscadmin.h"
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#define SpinLockInit(lock) S_INIT_LOCK(lock)
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#define SpinLockAcquire(lock) \
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do { \
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HOLD_INTERRUPTS(); \
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S_LOCK(lock); \
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} while (0)
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#define SpinLockAcquire_NoHoldoff(lock) S_LOCK(lock)
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#define SpinLockRelease(lock) \
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do { \
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S_UNLOCK(lock); \
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RESUME_INTERRUPTS(); \
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} while (0)
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#define SpinLockRelease_NoHoldoff(lock) S_UNLOCK(lock)
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#define SpinLockFree(lock) S_LOCK_FREE(lock)
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extern int SpinlockSemas(void);
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#endif /* SPIN_H */
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