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