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19 lines
493 B
19 lines
493 B
3 years ago
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/*
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* $Id: ia64.gcc,v 1.2 2002/02/02 18:18:05 ghutchis Exp $
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*
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* For gcc/ia64, 0 is clear, 1 is set.
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*/
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#define MUTEX_SET(tsl) ({ \
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register tsl_t *__l = (tsl); \
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long __r; \
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asm volatile("xchg1 %0=%1,%3" : "=r"(__r), "=m"(*__l) : "1"(*__l), "r"(1));\
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__r ^ 1; \
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})
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/*
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* Store through a "volatile" pointer so we get a store with "release"
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* semantics.
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*/
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#define MUTEX_UNSET(tsl) (*(volatile unsigned char *)(tsl) = 0)
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#define MUTEX_INIT(tsl) MUTEX_UNSET(tsl)
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