kolibrios/contrib/sdk/sources/newlib/libc/reent/mutex.c
Sergey Semyonov (Serge) 846fce0120 set default newlib dir's structure
git-svn-id: svn://kolibrios.org@4874 a494cfbc-eb01-0410-851d-a64ba20cac60
2014-04-22 09:02:02 +00:00

24 lines
405 B
C

void __mutex_lock(volatile int *val)
{
int tmp;
__asm__ __volatile__ (
"0:\n\t"
"mov %0, %1\n\t"
"testl %1, %1\n\t"
"jz 1f\n\t"
"movl $68, %%eax\n\t"
"movl $1, %%ebx\n\t"
"int $0x40\n\t"
"jmp 0b\n\t"
"1:\n\t"
"incl %1\n\t"
"xchgl %0, %1\n\t"
"testl %1, %1\n\t"
"jnz 0b\n"
: "+m" (*val), "=&r"(tmp)
::"eax","ebx" );
}