Local continuations

Local continuations form the basis for implementing protothreads. More...

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)
#define	LC_RESUME(s)
#define	LC_SET(s)
#define	LC_SET(s)

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

LC_RESUME [1/2]

#define LC_RESUME

(

s

)

Value:

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

LC_RESUME [2/2]

#define LC_RESUME

(

s

)

Value:

  switch (s) { /*NOLINT(bugprone-switch-missing-default-case)*/                \
  case 0:

LC_SET [1/2]

#define LC_SET

(

s

)

Value:

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

LC_SET [2/2]

#define LC_SET

(

s

)

Value:

  s = __LINE__;                                                                \
  /* fall through */                                                           \
  case __LINE__: