#include "interr.h" /* for declaration of lose() */
#define ARCH_HAS_STACK_POINTER
+#define ALIEN_STACK_GROWS_DOWNWARD
/* FIXME: Do we also want
* #define ARCH_HAS_FLOAT_REGISTERS
#define COMPILER_BARRIER \
do { __asm__ __volatile__ ( "" : : : "memory"); } while (0)
+#ifdef LISP_FEATURE_WIN32
+extern int os_number_of_processors;
+#define yield_on_uniprocessor() \
+ do { if (os_number_of_processors<=1) SwitchToThread(); } while(0)
+#else
+/* Stubs are better than ifdef EVERYWHERE. */
+#define yield_on_uniprocessor() \
+ do {} while(0)
+#endif
+
+
static inline void
get_spinlock(volatile lispobj *word, unsigned long value)
{
: "r" (value), "m" (*word)
: "memory", "cc");
#else
+ if (eax!=0) {
+ asm volatile("rep; nop");
+ }
asm volatile ("xor %0,%0\n\
lock cmpxchg %1,%2"
: "=a" (eax)
: "r" (value), "m" (*word)
: "memory", "cc");
#endif
-
+ yield_on_uniprocessor();
} while(eax!=0);
#else
*word=value;