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11.57 srfi.226 - Control features

Module: srfi.226

This srfi enhances the semantics of Scheme’s fundamental concepts such as continuations and dynamic environments, to support multi-threaded programs and delimited continuations. Some R7RS primitives such as call/cc and dynamic-wind are extended to be consistent with the enhanced execution model.

The thread API is mostly compatible with SRFI-18, and so as with Gauche’s thread API (see gauche.threads - Threads).

Since the enhanced features are tightly coupled with runtime, most APIs in this srfi is implemented as built-ins in Gauche. This section gives you the overview of SRFI-226 APIs and pointers to the documents.

In 0.9.13, Gauche only implements part of SRFI-226. We’ll cover its entirety in future releases.

SRFI-226 is an upward compatible extension of R7RS. However, Gauche has also extended R7RS control features in regards of multi-threaded programs, and there are subtle incompatibilites. We’ll move to full SRFI-226 compatibility, but we also provide backward-compatible interface. If you use srfi.226, you’ll get SRFI-226 behavior.

Here’s a list of SRFI-226 APIs and how Gauche supports them.

Continuation prompts
&continuation
make-continuation-violation
continuation-violation?
continuation-violation-prompt-tag

See Conditions

make-continuation-prompt-tag
default-continuation-prompt-tag
continuation-prompt-tag?
call-with-continuation-prompt
abort-current-continuation

See Continuation prompts.

Continuations
call-with-non-comosable-continuation
call-with-composable-continuation

Not implemented yet.

call-with-current-continuation
call/cc

See Continuations.

call-in-continuation
call-in

Not implemented yet.

call-with-continuation-barrier

Not implemented yet.

continuation-prompt-available?

Not implemented yet.

dynamic-wind

See Continuations.

unwind-protect

See High-level exception handling mechanism.

Shift and reset
shift-at
reset-at

Not implemented yet.

shift
reset

See gauche.partcont - Partial continuations. However, current implementation of shift/reset hasn’t integrated to SRFI-226 model yet.

Inspection
continuation?
non-composable-continuation?

Not implemented yet.

Continuation marks
with-continuation-mark
with-continuation-marks
call-with-immediate-continuation-mark
continuation-marks
current-continuation-marks
continuation-mark-set?
continuation-mark-set->list
continuation-mark-set-first

See Continuation marks.

continuation-mark-set->list*
continuation-mark-set->iterator

Not implemented yet.

make-continuation-mark-key
continuation-mark-key?

See Continuation marks.

Parameter objects
make-parameter
make-thread-parameter

See Parameters. Gauche’s built-in make-parameter works in a compatibility mode for now. If you use srfi.226, make-parameter works as specified in SRFI-226.

parameter?

See Parameters.

parameterize

See Parameters. Gauche’s built-in parameterize works in a compatibility mode for now. If you use srfi.226, make-parameter works as specified in SRFI-226.

current-parameterization
parameterization?
call-with-parameterization

See Parameters.

temporarily

See Dynamic states.

Fluids
define-fluid
define-thread-fluid
define-fluidified
fluid-let
fluid-let*
fluid-parameter

Not implemented yet.

Initial continuations
call-with-initial-continuation

Not implemented yet.

Promises
delay
promise?
force
make-promise

See Delay, force and lazy. Gauche’s built-ins are SRFI-226 compatible.

Exceptions
with-exception-handler
current-exception-handler
exception-handler-stack

See Low-level exception handling mechanism. Gauche’s built-ins are SRFI-226 compatible.

raise
raise-continuable

See Signaling exceptions.

guard

See High-level exception handling mechanism.

Conditions
&parameterization
make-parameterization-condition
parameterization-condition?
condition-parameterization

Not implemented yet.

&continuation-marks
make-continuation-marks-condition
continuation-marks-condition?
condition-continuation-marks

Not implemented yet.

&exception-handler-stack
make-exception-handler-stack-condition
exception-handler-stack-condition?
condition-exception-handler-stack

Not implemented yet.

Time objects
time?
current-time
seconds+ time

See Time.

Threads
&thread
make-thread-condition
thread-condition?
&uncaught-exception
make-uncaught-exception
uncaught-exception-condition?
uncaught-exception-condition-reason
&thread-already-terminated
make-thread-already-terminated-condition
thread-already-terminated-condition?
&thread-timeout
make-thread-timeout-condition
thread-timeout-condition?
&thread-abandoned-mutex
make-thread-abandoned-mutex-condition
thread-abandoned-mutex-condition?
&concurrent-modification
make-concurrent-modification-violation
concurrent-modification-violation?

See Thread exceptions.

make-thread
thread?
current-thread
thread-start!
thread-yield!
thread-sleep!
thread-terminate!
thread-schedule-terminate!
thread-join!

See gauche.threads - Threads.

make-mutex
mutex?
mutex-state
mutex-lock!
mutex-unlock!

See Mutex.

make-condition-variable
condition-variable?
condition-variable-signal!
condition-variable-broadcast!

See Condition variable.

make-thread-local
thread-local?
tlref
tlset!

See Thread local storage.

current-interrupt-level
disable-interrupts!
enable-interrupts!
with-interrupts-disabled
with-interrupts-enabled
thread-interrupt!

Not implemented yet.


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