diff options
Diffstat (limited to 'src/backend/storage/spin.h')
| -rw-r--r-- | src/backend/storage/spin.h | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/src/backend/storage/spin.h b/src/backend/storage/spin.h new file mode 100644 index 00000000000..32037684ec1 --- /dev/null +++ b/src/backend/storage/spin.h @@ -0,0 +1,38 @@ +/*------------------------------------------------------------------------- + * + * spin.h-- + * synchronization routines + * + * + * Copyright (c) 1994, Regents of the University of California + * + * $Id: spin.h,v 1.1.1.1 1996/07/09 06:21:53 scrappy Exp $ + * + *------------------------------------------------------------------------- + */ +#ifndef SPIN_H +#define SPIN_H + +#include "ipc.h" + +/* + * two implementations of spin locks + * + * sequent, sparc, sun3: real spin locks. uses a TAS instruction; see + * src/storage/ipc/s_lock.c for details. + * + * default: fake spin locks using semaphores. see spin.c + * + */ + +typedef int SPINLOCK; + +extern bool CreateSpinlocks(IPCKey key); +extern bool AttachSpinLocks(IPCKey key); +extern bool InitSpinLocks(int init, IPCKey key); + +extern void SpinAcquire(SPINLOCK lock); +extern void SpinRelease(SPINLOCK lock); +extern bool SpinIsLocked(SPINLOCK lock); + +#endif /* SPIN_H */ |