Hi,
I want to do the atomic operation ( such as i++ ) in user space, can I copy
and include include/XXX/atomic.h directly?
========================================================
The following is my test code:
/* atomic.c */
#include "atomic.h" /* copy from include/asm-sparc/atomic.h */
int main(int argc, char *argv[])
{
atomic_t atom;
atomic_set(&atom, 1);
return 0;
}
========================================================
After I compile it with gcc and disassemble with gdb, I get the following
code:
(gdb) disas main
Dump of assembler code for function main:
0x106c8 <main>: save %sp, -120, %sp
0x106cc <main+4>: st %i0, [ %fp + 0x44 ]
0x106d0 <main+8>: st %i1, [ %fp + 0x48 ]
0x106d4 <main+12>: mov 1, %o0 ==> (1)
0x106d8 <main+16>: st %o0, [ %fp + -20 ] ==> (2)
0x106dc <main+20>: clr %i0
0x106e0 <main+24>: b 0x106e8 <main+32>
0x106e4 <main+28>: nop
0x106e8 <main+32>: ret
0x106ec <main+36>: restore
End of assembler dump.
(gdb) quit
========================================================
I think line (1)&(2) do the atomic_set(&atom, 1) work, is it a atomic
operation?
Thanks,
Richard
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