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18 lines
424 B
18 lines
424 B
3 years ago
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/*
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* @(#)x86.gcc 11.1 (Sleepycat) 7/25/99
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*
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* For gcc/x86, 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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int __r; \
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asm volatile("movl $1,%%eax; lock; xchgb %1,%%al; xorl $1,%%eax"\
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: "=&a" (__r), "=m" (*__l) \
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: "1" (*__l) \
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); \
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__r & 1; \
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})
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#define MUTEX_UNSET(tsl) (*(tsl) = 0)
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#define MUTEX_INIT(tsl) MUTEX_UNSET(tsl)
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