Local continuations

Local continuations form the basis for implementing protothreads.

A local continuation can be set in a specific function to capture the state of the function. After a local continuation has been set can be resumed in order to restore the state of the function at the point where the local continuation was set.

Files
file	lc-addrlabels.h
	Implementation of local continuations based on the "Labels as values" feature of gcc.
file	lc-switch.h
	Implementation of local continuations based on switch() statement.
file	lc.h
	Local continuations.

Macros
#define	LC_END(s)   }
#define	LC_END(s)
#define	LC_H_
#define	LC_INIT(s)   s = NULL
#define	LC_INIT(s)   s = 0;
#define	LC_RESUME(s)   switch(s) { case 0:
#define	LC_RESUME(s)
#define	LC_SET(s)   s = __LINE__; case __LINE__:
#define	LC_SET(s)   do { ({ __label__ resume; resume: (s) = &&resume; }); }while(0)

Typedefs
typedef void *	lc_t
typedef unsigned short	lc_t

#define LC_END

(

s

)

}

#define LC_END

(

s

)

#define LC_H_

#define LC_INIT

(

s

)

s = NULL

#define LC_INIT

(

s

)

s = 0;

#define LC_RESUME

(

s

)

switch(s) { case 0:

#define LC_RESUME

(

s

)

Value:

do {                                          \
    if(s != NULL) {                             \
      goto *s;                                  \
    }                                           \
  } while(0)

#define LC_SET

(

s

)

s = __LINE__; case __LINE__:

#define LC_SET

(

s

)

do { ({ __label__ resume; resume: (s) = &&resume; }); }while(0)

typedef void* lc_t

typedef unsigned short lc_t