Local continuations

Collaboration diagram for Local continuations:

Files
file	lc-addrlabels.h
file	lc-switch.h
file	lc.h

Macros
#define	LC_INIT(s)   s = NULL
#define	LC_RESUME(s)
#define	LC_CONCAT2(s1, s2)   s1##s2
#define	LC_CONCAT(s1, s2)   LC_CONCAT2(s1, s2)
#define	LC_SET(s)
#define	LC_END(s)
#define	LC_INIT(s)   s = 0;
#define	LC_RESUME(s)   switch(s) { case 0:
#define	LC_SET(s)   s = __LINE__; case __LINE__:
#define	LC_END(s)   }
#define	__LC_H__

Typedefs
typedef void *	lc_t
typedef unsigned short	lc_t

Detailed Description

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.

Macro Definition Documentation

#define LC_RESUME

(

s

)

Value:

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

#define LC_SET

(

s

)

Value:

do {            \
    LC_CONCAT(LC_LABEL, __LINE__):            \
    (s) = &&LC_CONCAT(LC_LABEL, __LINE__);  \
  } while(0)