author | Claus Gittinger <cg@exept.de> |
Sat, 22 Mar 1997 16:19:44 +0100 | |
changeset 2484 | 05bd2cc43192 |
parent 1801 | 74d0e3858ded |
child 2876 | fb3fed7470be |
permissions | -rw-r--r-- |
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parents:
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1 |
" |
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parents:
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COPYRIGHT (c) 1995 by Stefan Vogel / Claus Gittinger |
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parents:
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3 |
All Rights Reserved |
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4 |
|
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parents:
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5 |
This software is furnished under a license and may be used |
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parents:
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|
6 |
only in accordance with the terms of that license and with the |
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documentation / example methods merged into one (easier to browse for category "examples")
Claus Gittinger <cg@exept.de>
parents:
770
diff
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7 |
inclusion of the above copyright notice. This software may not |
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documentation / example methods merged into one (easier to browse for category "examples")
Claus Gittinger <cg@exept.de>
parents:
770
diff
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be provided or otherwise made available to, or used by, any |
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documentation / example methods merged into one (easier to browse for category "examples")
Claus Gittinger <cg@exept.de>
parents:
770
diff
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|
9 |
other person. No title to or ownership of the software is |
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documentation / example methods merged into one (easier to browse for category "examples")
Claus Gittinger <cg@exept.de>
parents:
770
diff
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hereby transferred. |
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documentation / example methods merged into one (easier to browse for category "examples")
Claus Gittinger <cg@exept.de>
parents:
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" |
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parents:
770
diff
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IdentitySet subclass:#SemaphoreSet |
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instanceVariableNames:'' |
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classVariableNames:'' |
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poolDictionaries:'' |
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category:'Kernel-Processes' |
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! |
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!SemaphoreSet class methodsFor:'documentation'! |
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copyright |
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24 |
" |
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parents:
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COPYRIGHT (c) 1995 by Stefan Vogel / Claus Gittinger |
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Claus Gittinger <cg@exept.de>
parents:
770
diff
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26 |
All Rights Reserved |
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documentation / example methods merged into one (easier to browse for category "examples")
Claus Gittinger <cg@exept.de>
parents:
770
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27 |
|
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documentation / example methods merged into one (easier to browse for category "examples")
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parents:
770
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28 |
This software is furnished under a license and may be used |
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documentation / example methods merged into one (easier to browse for category "examples")
Claus Gittinger <cg@exept.de>
parents:
770
diff
changeset
|
29 |
only in accordance with the terms of that license and with the |
7b6c00a4708a
documentation / example methods merged into one (easier to browse for category "examples")
Claus Gittinger <cg@exept.de>
parents:
770
diff
changeset
|
30 |
inclusion of the above copyright notice. This software may not |
7b6c00a4708a
documentation / example methods merged into one (easier to browse for category "examples")
Claus Gittinger <cg@exept.de>
parents:
770
diff
changeset
|
31 |
be provided or otherwise made available to, or used by, any |
7b6c00a4708a
documentation / example methods merged into one (easier to browse for category "examples")
Claus Gittinger <cg@exept.de>
parents:
770
diff
changeset
|
32 |
other person. No title to or ownership of the software is |
7b6c00a4708a
documentation / example methods merged into one (easier to browse for category "examples")
Claus Gittinger <cg@exept.de>
parents:
770
diff
changeset
|
33 |
hereby transferred. |
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documentation / example methods merged into one (easier to browse for category "examples")
Claus Gittinger <cg@exept.de>
parents:
770
diff
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" |
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documentation / example methods merged into one (easier to browse for category "examples")
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parents:
770
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parents:
770
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! |
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parents:
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757 | 38 |
documentation |
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" |
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parents:
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SemaphoreSets allow waiting until one of several semaphores become available. |
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parents:
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They provide a waiting protocol compatible to Semaphore, i.e. #wait and |
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#waitWithTimeOut. |
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[see also:] |
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Semaphore |
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Process ProcessorScheduler |
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[author:] |
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Stefan Vogel |
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" |
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! |
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examples |
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parents:
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" |
775
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documentation / example methods merged into one (easier to browse for category "examples")
Claus Gittinger <cg@exept.de>
parents:
770
diff
changeset
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55 |
the following example forks a process which waits on any |
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documentation / example methods merged into one (easier to browse for category "examples")
Claus Gittinger <cg@exept.de>
parents:
770
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of sema1, sema2 to be signalled. The main thread signals those. |
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documentation / example methods merged into one (easier to browse for category "examples")
Claus Gittinger <cg@exept.de>
parents:
770
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--------------------------------------------------------------- |
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[exBegin] |
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|sema1 sema2 semaSet proc| |
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parents:
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parents:
770
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sema1 := Semaphore new. |
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parents:
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sema2 := Semaphore new. |
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parents:
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semaSet := SemaphoreSet with:sema1 with:sema2. |
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Claus Gittinger <cg@exept.de>
parents:
770
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Claus Gittinger <cg@exept.de>
parents:
770
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proc := [ |
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Claus Gittinger <cg@exept.de>
parents:
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[ |
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|ret name| |
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parents:
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parents:
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ret := semaSet wait. |
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ret == sema1 ifTrue:[ |
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name := 'sema1' |
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] ifFalse:[ |
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parents:
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ret == sema2 ifTrue:[ |
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parents:
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name := 'sema2' |
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Claus Gittinger <cg@exept.de>
parents:
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] |
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]. |
1422 | 77 |
Transcript showCR: name, ' raised'. |
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ret == sema2 ifTrue:[ |
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proc terminate |
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] |
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] loop |
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] fork. |
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(Delay forSeconds:3) wait. |
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sema1 signal. |
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(Delay forSeconds:3) wait. |
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sema2 signal. |
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[exEnd] |
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91 |
the following example forks a process which waits on any |
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parents:
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of sema1, sema2 to be signalled, or a timeout to occur. |
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parents:
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--------------------------------------------------------------- |
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[exBegin] |
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|sema1 sema2 semaSet proc| |
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sema1 := Semaphore new. |
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sema2 := Semaphore new. |
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semaSet := SemaphoreSet with:sema1 with:sema2. |
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|
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proc := [ |
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[ |
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|ret name| |
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ret := semaSet waitWithTimeout:5. |
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ret == sema1 ifTrue:[ |
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name := 'sema1' |
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] ifFalse:[ |
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ret == sema2 ifTrue:[ |
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name := 'sema2' |
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] ifFalse:[ |
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name := ret printString |
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] |
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]. |
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Transcript showCR: name, ' raised'. |
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ret isNil ifTrue:[ |
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proc terminate |
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] |
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] loop |
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] fork. |
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|
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(Delay forSeconds:3) wait. |
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parents:
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sema1 signal. |
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parents:
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(Delay forSeconds:3) wait. |
84cc1b36f27e
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parents:
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sema2 signal. |
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[exEnd] |
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the following example forks a process which waits on input |
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to arrive on any of 2 sharedQueues (with timeout) |
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The main thread writes data into those queues. |
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--------------------------------------------------------------- |
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[exBegin] |
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135 |
|q1 q2 semaSet proc| |
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136 |
|
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q1 := SharedQueue new. |
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q2 := SharedQueue new. |
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semaSet := SemaphoreSet with:(q1 readSemaphore) with:(q2 readSemaphore). |
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proc := [ |
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[ |
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|ret whatHappened| |
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|
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ret := semaSet waitWithTimeout:5. |
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ret == q1 readSemaphore ifTrue:[ |
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Transcript show:'q1 has data: '; show:q1 next; cr. |
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] ifFalse:[ |
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ret == q2 readSemaphore ifTrue:[ |
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Transcript show:'q2 has data: '; show:q2 next; cr. |
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] ifFalse:[ |
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Transcript showCR:'timeout' |
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] |
154 |
]. |
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] loop |
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] fork. |
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158 |
(Delay forSeconds:3) wait. |
|
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q1 nextPut:'one'. |
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(Delay forSeconds:2) wait. |
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q1 nextPut:'two'. |
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(Delay forSeconds:2) wait. |
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q1 nextPut:'three'. |
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(Delay forSeconds:6) wait. |
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proc terminate. |
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[exEnd] |
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" |
168 |
! ! |
|
169 |
||
170 |
!SemaphoreSet methodsFor:'wait'! |
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172 |
wait |
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"wait for any of the semaphores in the set to be signalled. |
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Return the (first) semaphore which is triggered." |
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175 |
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|currentProcess gotSema wasBlocked registeredAllSemas| |
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currentProcess := Processor activeProcess. |
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registeredAllSemas := false. |
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wasBlocked := OperatingSystem blockInterrupts. |
|
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[ |
|
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[ |
184 |
gotSema := self detect:[:sema| |
|
185 |
sema checkAndRegisterProcess:currentProcess |
|
186 |
] ifNone:[ |
|
187 |
registeredAllSemas := true. |
|
188 |
currentProcess suspendWithState:#wait. |
|
189 |
nil |
|
190 |
]. |
|
191 |
] doWhile:[gotSema isNil]. |
|
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|
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" |
194 |
we finaly got at least one of our semaphores. |
|
195 |
Now unregister from any semaphore, we are registered on. |
|
196 |
" |
|
197 |
self detect:[:sema| |
|
198 |
(sema == gotSema) ifTrue:[ |
|
199 |
registeredAllSemas not |
|
200 |
] ifFalse:[ |
|
201 |
sema unregisterProcess:currentProcess. |
|
202 |
false |
|
203 |
] |
|
204 |
] ifNone:[]. |
|
205 |
] valueNowOrOnUnwindDo:[ |
|
206 |
wasBlocked ifFalse:[OperatingSystem unblockInterrupts]. |
|
207 |
]. |
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208 |
|
757 | 209 |
^ gotSema |
210 |
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211 |
"Modified: 15.12.1995 / 23:10:07 / stefan" |
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"Modified: 28.2.1996 / 21:25:54 / cg" |
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213 |
! |
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214 |
|
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215 |
waitWithTimeout:seconds |
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"wait for any of the the semaphore, but abort the wait after some time. |
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Return the (first) triggered semaphore if any, nil if we return due to a timeout." |
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218 |
|
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|currentProcess gotSema wasBlocked now endTime unblock timeoutOccured registeredAllSemas| |
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220 |
|
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221 |
currentProcess := Processor activeProcess. |
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222 |
timeoutOccured := false. |
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223 |
registeredAllSemas := false. |
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224 |
|
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225 |
wasBlocked := OperatingSystem blockInterrupts. |
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[ |
227 |
seconds notNil ifTrue:[ |
|
228 |
" |
|
229 |
calculate the end-time |
|
230 |
" |
|
231 |
now := OperatingSystem getMillisecondTime. |
|
232 |
endTime := OperatingSystem millisecondTimeAdd:now and:(seconds * 1000). |
|
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233 |
|
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unblock := [timeoutOccured := true. Processor resume:currentProcess]. |
235 |
Processor addTimedBlock:unblock for:currentProcess atMilliseconds:endTime. |
|
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236 |
]. |
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237 |
|
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[ |
239 |
gotSema := self detect:[:sema| |
|
240 |
sema checkAndRegisterProcess:currentProcess |
|
241 |
] ifNone:[ |
|
242 |
registeredAllSemas := true. |
|
243 |
currentProcess suspendWithState:#wait. |
|
244 |
nil |
|
245 |
]. |
|
246 |
] doWhile:[gotSema isNil and:[timeoutOccured not]]. |
|
247 |
||
248 |
(timeoutOccured not and:[unblock notNil]) ifTrue:[ |
|
249 |
Processor removeTimedBlock:unblock. |
|
250 |
]. |
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251 |
|
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" |
253 |
we finaly got at least one of our semaphores. |
|
254 |
Now unregister from any semaphore, we are registered on. |
|
255 |
" |
|
256 |
self detect:[:sema| |
|
257 |
(sema == gotSema) ifTrue:[ |
|
258 |
registeredAllSemas not |
|
259 |
] ifFalse:[ |
|
260 |
sema unregisterProcess:currentProcess. |
|
261 |
false |
|
262 |
] |
|
263 |
] ifNone:[]. |
|
264 |
] valueNowOrOnUnwindDo:[ |
|
265 |
wasBlocked ifFalse:[OperatingSystem unblockInterrupts]. |
|
266 |
]. |
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267 |
^ gotSema |
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268 |
|
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269 |
"Modified: 15.12.1995 / 23:10:54 / stefan" |
1031 | 270 |
"Modified: 28.2.1996 / 21:26:19 / cg" |
757 | 271 |
! ! |
272 |
||
273 |
!SemaphoreSet class methodsFor:'documentation'! |
|
274 |
||
275 |
version |
|
1801 | 276 |
^ '$Header: /cvs/stx/stx/libbasic/SemaphoreSet.st,v 1.10 1996-10-22 19:34:31 cg Exp $' |
757 | 277 |
! ! |