synch

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Documentation

Where MUTEX-FORM below the following forms are accepted:

MUTEX-OBJECT: mutex
(MUTEX-OBJECT [(LOCK-ARG...) [(UNLOCK-ARG...)]]): mutex w/ optional lock and unlock arguments

Synchronized Invocation - Continuation Safe

These forms have the mutex lock/unlock wrapped in dynamic-wind.

(synch MUTEX-FORM [BODY ...]) -> *syntax

Execute BODY ... while MUTEX locked.

Returns the result of BODY ....

synch-with

(synch-with MUTEX-FORM VARIABLE [BODY ...]) -> *syntax

Execute BODY ... while MUTEX locked and the mutex-specific of MUTEX bound to VARIABLE.

Returns the result of BODY ....

call-synch

(call-synch MUTEX-FORM PROCEDURE [ARGUMENTS ...]) -> *syntax

Invoke PROCEDURE on the argument list ARGUMENTS ... while MUTEX locked.

Returns the result of the PROCEDURE invocation.

call-synch-with

(call-synch-with MUTEX-FORM PROCEDURE [ARGUMENTS ...]) -> *syntax

Invoke PROCEDURE on the mutex-specific of MUTEX and the ARGUMENTS ... while MUTEX locked.

Returns the result of the PROCEDURE invocation.

apply-synch

(apply-synch MUTEX-FORM PROCEDURE [ARGUMENTS ...]) -> *syntax

Apply PROCEDURE to the argument list ARGUMENTS ... while MUTEX locked.

Returns the result of the PROCEDURE application.

apply-synch-with

(apply-synch-with MUTEX-FORM PROCEDURE [ARGUMENTS ...]) -> *syntax

Apply PROCEDURE to the mutex-specific of MUTEX) and the ARGUMENTS ... while MUTEX locked.

Returns the result of the PROCEDURE application.

synch-lock

(synch-lock MUTEX-FORM [BODY ...]) -> *syntax

Execute BODY ... while MUTEX locked, and leave mutex locked.

Returns the result of BODY ....

synch-unlock

(synch-unlock MUTEX-FORM [BODY ...]) -> *syntax

Execute BODY ... while MUTEX locked, and leave mutex unlocked.

Returns the result of BODY ....

Should the mutex be unlocked a warning is issued and the mutex is locked before executing the BODY.

let-synch-with

(let-synch-with BINDINGS [BODY ...]) -> *syntax

BINDINGS is a list of (VARIABLE MUTEX-FORM).

Expands into a nested (synch-with MUTEX-FORM VARIABLE ... form, a synch-with for each binding pair in BINDINGS. The leftmost binding pair is the outermost.

Returns the result of BODY ....

set!-synch-with

(set!-synch-with MUTEX-FORM VARIABLE [BODY ...]) -> *syntax

While the MUTEX is locked, evaluates BODY ... with the VARIABLE bound to the mutex-specific of MUTEX. Sets the mutex-specific of MUTEX to the result of the evaluation.

Returns the new mutex-specific of MUTEX.

object-synch-cut-with

<macro>(object-synch-cut-with MUTEX-FORM [BODY ...]) -> *<-macro>

Execute BODY ... while MUTEX locked.

The top-level forms of BODY ... are parsed for occurrences of ><. All such occurrences are replaced by the mutex-specific of MUTEX.

Returns the result of BODY ....

record-synch

(record-synch RECORD-OBJECT RECORD-SYMBOL [BODY ...]) -> *syntax

Execute BODY ... while the RECORD-OBJECT mutex is locked. The mutex is a field of the record named RECORD-SYMBOL-mutex.

Returns the result of BODY ....

(define-record-type foo
  (make-foo a b mtx)
  foo?
  (a foo-a)
  (b foo-b)
  (mtx foo-mutex) )

(define f1 (make-foo 1 2 (make-mutex 'foo)))

(record-synch foo f1 (+ (foo-a f1) (foo-b f1)))

record-synch-lock

(record-synch-lock RECORD-OBJECT RECORD-SYMBOL [BODY ...]) -> *syntax

Execute BODY ... while the RECORD-OBJECT mutex is locked, and leave the mutex locked.

Returns the result of BODY ....

RECORD-SYMBOL and RECORD-OBJECT are per record-synch.

record-synch-unlock

(record-synch-unlock RECORD-OBJECT RECORD-SYMBOL [BODY ...]) -> *syntax

Execute BODY ... while the RECORD-OBJECT mutex is locked, and leave the mutex unlocked.

Returns the result of BODY ....

RECORD-SYMBOL and RECORD-OBJECT are per record-synch.

Should the mutex be unlocked a warning is issued and the mutex is locked before executing the BODY.

Synchronized Invocation - Continuation Unsafe

These forms do not have the mutex lock/unlock wrapped in dynamic-wind, otherwise the same behavior.

Object Synchronization

make-synch-with-object

make-synch-with-object OBJECT #!optional NAMEprocedure

Returns a mutex with a mutex-specific value of OBJECT, and optional mutex NAME.

NAME is either a symbol or a one element list of symbol. When a list the first element is used as the basis for a generated symbol. When a symbol it is used literally as the mutex name.

When NAME is missing a generated symbol with the prefix synchobj is provided.

synch-with-object?

synch-with-object? OBJECT #!optional PREDICATEprocedure

Is the OBJECT a synchronized object - a mutex with a non-void mutex specific?

The optional PREDICATE is used to verify the type of the mutex-specific binding. Otherwise any object is accepted.

define-constructor-synch

(define-constructor-synch CTORNAME [ID])syntax

(define-constructor-synch make-hash-table hash-table-synch)
;=> similar
(define (make-hash-table-sync . args)
  (make-synch-with-object (apply make-hash-table args) '(hash-table-synch)) )

define-predicate-synch

(define-predicate-synch PREDNAME)syntax

(define-predicate-synch hash-table?)
;=> similar
(define (hash-table?-sync obj) (synch-with-object? obj hash-table?))

define-operation-synch

(define-operation-synch OPERNAME)syntax

Note that the operand must be the first argument of OPERNAME.

(define-operation-synch hash-table-set!)
;=> similar
(define (hash-table-set!-sync mtx+obj . args)
  (let ((mtx (if (pair? mtx+obj) (car mtx+obj) mtx+obj)))
    (check-mutex+object 'hash-table-set!-synch mtx 'object-synch)
    (synch-with mtx+obj obj (apply hash-table-set! obj args)) ) )

define-operation-%synch

(define-operation-%synch OPERNAME)syntax: Note that the operand must be the first argument of OPERNAME.

synchronized-procedure

synchronized-procedure PROCprocedure: Returns a synchronized version of PROC

Usage

(require-extension synch)

(require-library synch)
...
(import synch)

Version history

2.4.1: Fix lock failure handling.
2.4.0
2.3.0: Add critical-region, synchronized-procedure, record-synch, record-synch-lock, record-synch-unlock, call-synch, call-synch-with, apply-synch, apply-synch-with, let-synch-with, set!-synch-with, synch-lock, synch-unlock, object-synch-cut-with, make-synch-with-object, synch-with-object?, define-constructor-synch, define-predicate-synch, define-operation-synch.
2.2.2
2.2.1: Do not build format-synch.
2.2.0: Deprecate ../synch bindings. Add 'format-synch.scm'.
2.1.4: .
2.1.3: .
2.1.2: Ensure all local vars in operation macros hygenic.
2.1.1: Fix %record/synch body expansion. Fix make-object/synch default name.
2.1.0: Support for mutex lock/unlock arguments. Operation wrapper macros.
2.0.0: Port to hygienic Chicken. Removed 'set-object!/synch'.

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