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WebSVN – planix.SVN – Blame – /os/branches/planix-v0/sys/src/cmd/unix/drawterm/posix-amd64/tas.c – Rev 2

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#include "u.h"
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#include "libc.h"
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int
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tas(long *x)
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{
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	int     v;
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	__asm__(	"movl   $1, %%eax\n\t"
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				"xchgl  %%eax,(%%rcx)"
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				: "=a" (v)
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				: "c" (x)
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	);
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	switch(v) {
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	case 0:
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	case 1:
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		return v;
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	default:
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		print("canlock: corrupted 0x%lux\n", v);
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		return 1;
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	}
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}
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