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#include <u.h>
// -----------------------------------------------------------------------
// Assembly routines.
extern void _newcoro(coro *co, uintptr (*func)(coro*, uintptr), void *stk);
extern uintptr _coroyield(coro *co, uintptr arg);
struct coro
{
void* sp;
void* bp;
uintptr size;
void* user;
};
coro*
coro·new(uintptr stk, uintptr (*func)(coro*, uintptr))
{
if (!func)
return nil;
if (stk == 0) stk = 8192;
byte *block = malloc(stk);
coro *co = (coro*)&block[stk - sizeof(coro)];
co->bp = block;
co->size = stk;
_newcoro(co, func, co);
return co;
}
error
coro·free(coro *co)
{
enum
{
NIL,
GOOD,
EMPTY,
LOST,
};
if (!co) return NIL;
if (!co->bp) return LOST;
if (co->size == 0) return EMPTY;
free(co->bp);
return GOOD;
}
uintptr
coro·yield(coro *c, uintptr arg)
{
return _coroyield(c, arg);
}
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