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Fast spinlocks from SheepShaver for X11 clipboard handling

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gbeauche 2004-11-15 23:24:09 +00:00
parent df471bbbe6
commit e7fb4be12f
1 changed files with 155 additions and 0 deletions
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155
BasiliskII/src/Unix/sysdeps.h
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@ -197,6 +197,161 @@ typedef uae_u32 uaecptr;
extern uint64 GetTicks_usec(void);
extern void Delay_usec(uint32 usec);
/* Spinlocks */
#ifdef __GNUC__
#if defined(__powerpc__) || defined(__ppc__)
#define HAVE_TEST_AND_SET 1
static inline int testandset(volatile int *p)
{
int ret;
__asm__ __volatile__("0: lwarx %0,0,%1\n"
" xor. %0,%3,%0\n"
" bne 1f\n"
" stwcx. %2,0,%1\n"
" bne- 0b\n"
"1: "
: "=&r" (ret)
: "r" (p), "r" (1), "r" (0)
: "cr0", "memory");
return ret;
}
#endif
/* FIXME: SheepShaver occasionnally hangs with those locks */
#if 0 && (defined(__i386__) || defined(__x86_64__))
#define HAVE_TEST_AND_SET 1
static inline int testandset(volatile int *p)
{
long int ret;
/* Note: the "xchg" instruction does not need a "lock" prefix */
__asm__ __volatile__("xchgl %k0, %1"
: "=r" (ret), "=m" (*p)
: "0" (1), "m" (*p)
: "memory");
return ret;
}
#endif
#ifdef __s390__
#define HAVE_TEST_AND_SET 1
static inline int testandset(volatile int *p)
{
int ret;
__asm__ __volatile__("0: cs %0,%1,0(%2)\n"
" jl 0b"
: "=&d" (ret)
: "r" (1), "a" (p), "0" (*p)
: "cc", "memory" );
return ret;
}
#endif
#ifdef __alpha__
#define HAVE_TEST_AND_SET 1
static inline int testandset(volatile int *p)
{
int ret;
unsigned long one;
__asm__ __volatile__("0: mov 1,%2\n"
" ldl_l %0,%1\n"
" stl_c %2,%1\n"
" beq %2,1f\n"
".subsection 2\n"
"1: br 0b\n"
".previous"
: "=r" (ret), "=m" (*p), "=r" (one)
: "m" (*p));
return ret;
}
#endif
#ifdef __sparc__
#define HAVE_TEST_AND_SET 1
static inline int testandset(volatile int *p)
{
int ret;
__asm__ __volatile__("ldstub [%1], %0"
: "=r" (ret)
: "r" (p)
: "memory");
return (ret ? 1 : 0);
}
#endif
#ifdef __arm__
#define HAVE_TEST_AND_SET 1
static inline int testandset(volatile int *p)
{
register unsigned int ret;
__asm__ __volatile__("swp %0, %1, [%2]"
: "=r"(ret)
: "0"(1), "r"(p));
return ret;
}
#endif
#endif /* __GNUC__ */
typedef volatile int spinlock_t;
static const spinlock_t SPIN_LOCK_UNLOCKED = 0;
#if HAVE_TEST_AND_SET
#define HAVE_SPINLOCKS 1
static inline void spin_lock(spinlock_t *lock)
{
while (testandset(lock));
}
static inline void spin_unlock(spinlock_t *lock)
{
*lock = 0;
}
static inline int spin_trylock(spinlock_t *lock)
{
return !testandset(lock);
}
#else
static inline void spin_lock(spinlock_t *lock)
{
}
static inline void spin_unlock(spinlock_t *lock)
{
}
static inline int spin_trylock(spinlock_t *lock)
{
return 1;
}
#endif
/* X11 display fast locks */
#ifdef HAVE_SPINLOCKS
#define X11_LOCK_TYPE spinlock_t
#define X11_LOCK_INIT SPIN_LOCK_UNLOCKED
#define XDisplayLock() spin_lock(&x_display_lock)
#define XDisplayUnlock() spin_unlock(&x_display_lock)
#elif defined(HAVE_PTHREADS)
#define X11_LOCK_TYPE pthread_mutex_t
#define X11_LOCK_INIT PTHREAD_MUTEX_INITIALIZER
#define XDisplayLock() pthread_mutex_lock(&x_display_lock);
#define XDisplayUnlock() pthread_mutex_unlock(&x_display_lock);
#else
#define XDisplayLock()
#define XDisplayUnlock()
#endif
#ifdef X11_LOCK_TYPE
extern X11_LOCK_TYPE x_display_lock;
#endif
#ifdef HAVE_PTHREADS
/* Centralized pthread attribute setup */
void Set_pthread_attr(pthread_attr_t *attr, int priority);