/* ot.h - Orangetide's Tiny threads */
/* PUBLIC DOMAIN - Jon Mayo - August 23, 2005 */
#ifndef OT_H
#define OT_H

struct ot_state {
	unsigned line;
};

#define OT_STATUS_WAITING	        1
#define OT_STATUS_EXITED	        0
#define OT_BEGIN(ots)		        switch((ots)->line) { case 0:
#define OT_END(ots)		        } OT_EXIT(ots);
#define OT_INITIALIZE(ots)	        ((ots)->line=0)
#define OT_INITIALIZER		        {0}

/* sets the state, on reentry the program will continue at this point */
#define OT_SET(ots)	                (ots)->line=__LINE__; case __LINE__:

/* wait while condition cond is true */
#define OT_WAIT_WHILE(ots, cond)	do { OT_SET(ots); if((cond)) { return OT_STATUS_WAITING; } } while(0)

/* checks condition cond and continues if it's true */
#define OT_WAIT_UNTIL(ots, cond)	do { OT_SET(ots); if(!(cond)) { return OT_STATUS_WAITING; } } while(0)

/* restarts the state machine from the beginning */
#define OT_RESTART(ots)		        do { OT_INITIALIZE(ots); return OT_STATUS_WAITING; } while(0)

#define OT_EXIT(ots)		        do { OT_INITIALIZE(ots); return OT_STATUS_EXITED; } while(0)

/* use this for debugging, evalutes to the line number currently holding on */
#define OT_LINE(ots)		        ((ots)->line)

#endif