src/impl-clozure.lisp

   1 ;;;; -*- indent-tabs-mode: nil -*-
   2
   3 #|
   4 Copyright 2006, 2007 Greg Pfeil
   5
   6 Distributed under the MIT license (see LICENSE file)
   7 |#
   8
   9 (in-package #:bordeaux-threads)
  10
  11 ;;; documentation on the OpenMCL Threads interface can be found at
  12 ;;; http://openmcl.clozure.com/Doc/Programming-with-Threads.html
  13
  14 (deftype thread ()
  15   'ccl:process)
  16
  17 ;;; Thread Creation
  18
  19 (defun %make-thread (function name)
  20   (ccl:process-run-function name function))
  21
  22 (defun current-thread ()
  23   ccl:*current-process*)
  24
  25 (defun threadp (object)
  26   (typep object 'ccl:process))
  27
  28 (defun thread-name (thread)
  29   (ccl:process-name thread))
  30
  31 ;;; Resource contention: locks and recursive locks
  32
  33 (deftype lock () 'ccl:lock)
  34
  35 (deftype recursive-lock () 'ccl:lock)
  36
  37 (defun lock-p (object)
  38   (typep object 'ccl:lock))
  39
  40 (defun recursive-lock-p (object)
  41   (typep object 'ccl:lock))
  42
  43 (defun make-lock (&optional name)
  44   (ccl:make-lock (or name "Anonymous lock")))
  45
  46 (defun acquire-lock (lock &optional (wait-p t))
  47   (if wait-p
  48       (ccl:grab-lock lock)
  49       (ccl:try-lock lock)))
  50
  51 (defun release-lock (lock)
  52   (ccl:release-lock lock))
  53
  54 (defmacro with-lock-held ((place) &body body)
  55   `(ccl:with-lock-grabbed (,place)
  56      ,@body))
  57
  58 (defun make-recursive-lock (&optional name)
  59   (ccl:make-lock (or name "Anonymous recursive lock")))
  60
  61 (defun acquire-recursive-lock (lock)
  62   (ccl:grab-lock lock))
  63
  64 (defun release-recursive-lock (lock)
  65   (ccl:release-lock lock))
  66
  67 (defmacro with-recursive-lock-held ((place) &body body)
  68   `(ccl:with-lock-grabbed (,place)
  69      ,@body))
  70
  71 ;;; Resource contention: condition variables
  72
  73 (defun make-condition-variable (&key name)
  74   (declare (ignore name))
  75   (ccl:make-semaphore))
  76
  77 (defun condition-wait (condition-variable lock &key timeout)
  78   (release-lock lock)
  79   (unwind-protect
  80        (if timeout
  81            (ccl:timed-wait-on-semaphore condition-variable timeout)
  82            (ccl:wait-on-semaphore condition-variable))
  83     (acquire-lock lock t))
  84   t)
  85
  86 (defun condition-notify (condition-variable)
  87   (ccl:signal-semaphore condition-variable))
  88
  89 (defun thread-yield ()
  90   (ccl:process-allow-schedule))
  91
  92 ;;; Semaphores
  93
  94 (deftype semaphore ()
  95   'ccl:semaphore)
  96
  97 (defun make-semaphore (&key name (count 0))
  98   (declare (ignore name))
  99   (let ((semaphore (ccl:make-semaphore)))
 100     (dotimes (c count) (ccl:signal-semaphore semaphore))
 101     semaphore))
 102
 103 (defun signal-semaphore (semaphore &key (count 1))
 104   (dotimes (c count) (ccl:signal-semaphore semaphore)))
 105
 106 (defun wait-on-semaphore (semaphore &key timeout)
 107   (if timeout
 108       (ccl:timed-wait-on-semaphore semaphore timeout)
 109       (ccl:wait-on-semaphore semaphore)))
 110
 111 ;;; Introspection/debugging
 112
 113 (defun all-threads ()
 114   (ccl:all-processes))
 115
 116 (defun interrupt-thread (thread function &rest args)
 117   (declare (dynamic-extent args))
 118   (apply #'ccl:process-interrupt thread function args))
 119
 120 (defun destroy-thread (thread)
 121   (signal-error-if-current-thread thread)
 122   (ccl:process-kill thread))
 123
 124 (defun thread-alive-p (thread)
 125   (not (ccl:process-exhausted-p thread)))
 126
 127 (defun join-thread (thread)
 128   (ccl:join-process thread))
 129
 130 (mark-supported)