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yap-6.3/OPTYap/mips_locks.h
ricroc b8546491fc copyright header in OPTYap files
git-svn-id: https://yap.svn.sf.net/svnroot/yap/trunk@1315 b08c6af1-5177-4d33-ba66-4b1c6b8b522a
2005-05-31 08:24:24 +00:00

70 lines
2.8 KiB
C

/**********************************************************************
The OPTYap Prolog system
OPTYap extends the Yap Prolog system to support or-parallel tabling
Copyright: R. Rocha and NCC - University of Porto, Portugal
File: mips_locks.h
version: $Id: mips_locks.h,v 1.2 2005-05-31 08:24:24 ricroc Exp $
**********************************************************************/
/* ------------------------------- **
** Atomic locking for MIPS **
** ------------------------------- */
/* This code is stolen from the Linux kernel */
typedef struct { unsigned long a[100]; } __dummy_lock_t;
#define __dummy_lock(lock) (*(__dummy_lock_t *)(lock))
#define load_linked(addr) \
({ \
unsigned int __res; \
\
__asm__ __volatile__( \
"ll\t%0,(%1)" \
: "=r" (__res) \
: "r" ((unsigned long) (addr))); \
\
__res; \
})
#define store_conditional(addr,value) \
({ \
int __res; \
\
__asm__ __volatile__( \
"sc\t%0,(%2)" \
: "=r" (__res) \
: "0" (value), "r" (addr)); \
\
__res; \
})
#define INIT_LOCK(LOCK_VAR) ((LOCK_VAR) = 0)
#define TRY_LOCK(LOCK_PTR) (!test_and_set_bit(0,(__dumy_lock_t *)(LOCK_PTR)))
#define LOCK(LOCK_VAR) _spin_lock((__dummy_lock_t *)(&(LOCK_VAR)))
#define IS_LOCKED(LOCK_VAR) ((LOCK_VAR) != 0)
#define IS_UNLOCKED(LOCK_VAR) ((LOCK_VAR) == 0)
/* We need to support sync on MIPS */
#define UNLOCK(LOCK_VAR) spin_unlock((__dummy_lock_t *)(&(LOCK_VAR)))
typedef struct {
volatile unsigned int lock;
} rwlock_t;
#define RW_LOCK_UNLOCKED (rwlock_t) { 0 }
#define READ_LOCK(X) _read_lock(&(X))
#define READ_UNLOCK(X) _read_unlock(&(X))
#define WRITE_LOCK(X) _write_lock(&(X))
#define WRITE_UNLOCK(X) _write_unlock(&(X))
#define INIT_RWLOCK(RW) (RW) = RW_LOCK_UNLOCKED