apiv2/impl-allegro.lisp

   1 ;;;; -*- indent-tabs-mode: nil -*-
   2
   3 (in-package :bordeaux-threads-2)
   4
   5 #-(version>= 9)
   6 (error 'bordeaux-threads-error
   7        :message "Threading not supported")
   8
   9 ;;;
  10 ;;; Threads
  11 ;;;
  12
  13 (deftype native-thread ()
  14   'mp:process)
  15
  16 (defun %start-multiprocessing ()
  17   (mp:start-scheduler))
  18
  19 (defun %make-thread (function name)
  20   (mp:process-run-function name function))
  21
  22 (defun %current-thread ()
  23   mp:*current-process*)
  24
  25 (defun %thread-name (thread)
  26   (mp:process-name thread))
  27
  28 (defun %join-thread (thread)
  29   #+smp
  30   (mp:process-join thread)
  31   #-smp
  32   (mp:process-wait (format nil "Waiting for thread ~A to complete" thread)
  33                    (complement #'mp:process-alive-p)
  34                    thread))
  35
  36 (defun %thread-yield ()
  37   (mp:process-allow-schedule))
  38
  39 ;;;
  40 ;;; Introspection/debugging
  41 ;;;
  42
  43 (defun %all-threads ()
  44   mp:*all-processes*)
  45
  46 (defun %interrupt-thread (thread function)
  47   (mp:process-interrupt thread function))
  48
  49 (defun %destroy-thread (thread)
  50   (mp:process-kill thread))
  51
  52 (defun %thread-alive-p (thread)
  53   (mp:process-alive-p thread))
  54 \f
  55
  56 ;;;
  57 ;;; Non-recursive locks
  58 ;;;
  59
  60 (deftype native-lock () 'mp:process-lock)
  61
  62 (defun %make-lock (name)
  63   (mp:make-process-lock :name name))
  64
  65 (defun %acquire-lock (lock waitp timeout)
  66   (mp:process-lock lock mp:*current-process* "Lock"
  67                    (if waitp timeout 0)))
  68
  69 (defun %release-lock (lock)
  70   (mp:process-unlock lock))
  71
  72 (defmacro %with-lock ((place timeout) &body body)
  73   `(mp:with-process-lock (,place :timeout ,timeout :norecursive t)
  74      ,@body))
  75
  76 ;;;
  77 ;;; Recursive locks
  78 ;;;
  79
  80 (deftype native-recursive-lock () 'mp:process-lock)
  81
  82 (defun %make-recursive-lock (name)
  83   (mp:make-process-lock :name name))
  84
  85 (mark-not-implemented 'acquire-recursive-lock)
  86 (defun %acquire-recursive-lock (lock waitp timeout)
  87   (declare (ignore lock waitp timeout))
  88   (signal-not-implemented 'acquire-recursive-lock))
  89
  90 (mark-not-implemented 'release-recursive-lock)
  91 (defun %release-recursive-lock (lock)
  92   (declare (ignore lock))
  93   (signal-not-implemented 'release-recursive-lock))
  94
  95 (defmacro %with-recursive-lock ((place timeout) &body body)
  96   `(mp:with-process-lock (,place :timeout ,timeout)
  97      ,@body))
  98 \f
  99
 100 ;;;
 101 ;;; Timeouts
 102 ;;;
 103
 104 (defmacro with-timeout ((timeout) &body body)
 105   (once-only (timeout)
 106     `(mp:with-timeout (,timeout (error 'timeout :length ,timeout))
 107        ,@body)))
 108 \f
 109
 110 ;;;
 111 ;;; Semaphores
 112 ;;;
 113
 114 (defstruct (semaphore
 115             (:constructor %%make-semaphore (name)))
 116   "Bordeaux-threads implementation of semaphores."
 117   name
 118   (gate (mp:make-gate nil)))
 119
 120 (defmethod print-object ((sem semaphore) stream)
 121   (print-unreadable-object (sem stream :type t :identity t)
 122     (format stream "~S" (semaphore-name sem))))
 123
 124 (defun %make-semaphore (name count)
 125   (let ((sem (%%make-semaphore name)))
 126     (%signal-semaphore sem count)
 127     sem))
 128
 129 (defun %signal-semaphore (semaphore count)
 130   (dotimes (i count)
 131     (mp:put-semaphore (semaphore-gate semaphore))))
 132
 133 (defun %wait-on-semaphore (semaphore timeout)
 134   (cond
 135     (timeout
 136      ;; Timeouts that are too small expire immediately.
 137      ;; 100ms should suffice.
 138      (when (< timeout 0.1)
 139        (setf timeout 0.1))
 140      (handler-case
 141          (with-timeout (timeout)
 142            (mp:get-semaphore (semaphore-gate semaphore))
 143            t)
 144        (timeout () nil)))
 145     (t
 146      (mp:get-semaphore (semaphore-gate semaphore))
 147      t)))
 148 \f
 149
 150 ;;;
 151 ;;; Condition variables
 152 ;;;
 153
 154 (deftype condition-variable ()
 155   'mp:condition-variable)
 156
 157 (defun %make-condition-variable (name)
 158   (mp:make-condition-variable :name name))
 159
 160 (defun %condition-wait (cv lock timeout)
 161   (mp:condition-variable-wait cv lock :timeout timeout))
 162
 163 (defun %condition-notify (cv)
 164   (mp:condition-variable-signal cv))
 165
 166 (defun %condition-broadcast (cv)
 167   (mp:condition-variable-broadcast cv))