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Use the __COUNTER__ macro instead of __LINE__ #14

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Use the __COUNTER__ macro instead of __LINE__ #14

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9 changes: 7 additions & 2 deletions async/async.h
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Original file line number Diff line number Diff line change
Expand Up @@ -69,6 +69,11 @@
*/
typedef enum ASYNC_EVT { ASYNC_INIT = 0, ASYNC_CONT = ASYNC_INIT, ASYNC_DONE = 1 } async;

/**
* Gets a unique number starting at 2 to avoid conflict with ASYNC_EVT
*/
#define _UNIQUE_NUM __COUNTER__ + 2

/**
* Declare the async state
*/
Expand Down Expand Up @@ -101,12 +106,12 @@ struct async { async_state; };
* Wait while the condition succeeds
* @param cond The condition that must fail before execution can proceed
*/
#define await_while(cond) *_async_k = __LINE__; case __LINE__: if (cond) return ASYNC_CONT
#define await_while(cond) *_async_k = _UNIQUE_NUM + 1; case _UNIQUE_NUM: if (cond) return ASYNC_CONT

/**
* Yield execution
*/
#define async_yield *_async_k = __LINE__; return ASYNC_CONT; case __LINE__:
#define async_yield *_async_k = _UNIQUE_NUM + 1; return ASYNC_CONT; case _UNIQUE_NUM:

/**
* Exit the current async subroutine
Expand Down