e5f4633c39
which included commits to RCS files with non-trunk default branches. git-svn-id: https://yap.svn.sf.net/svnroot/yap/trunk@5 b08c6af1-5177-4d33-ba66-4b1c6b8b522a
59 lines
2.2 KiB
C
59 lines
2.2 KiB
C
/* ------------------------------- **
|
|
** 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
|