author | Claus Gittinger <cg@exept.de> |
Thu, 25 Apr 1996 18:20:46 +0200 | |
changeset 1290 | 15ba3221b89b |
parent 1273 | f8449f53a6a3 |
child 1294 | e26bbb61f6b2 |
permissions | -rw-r--r-- |
775
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documentation / example methods merged into one (easier to browse for category "examples")
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parents:
770
diff
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1 |
" |
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parents:
770
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COPYRIGHT (c) 1995 by Stefan Vogel / Claus Gittinger |
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parents:
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All Rights Reserved |
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parents:
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4 |
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parents:
770
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5 |
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:
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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
changeset
|
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
changeset
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8 |
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
|
9 |
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
|
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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:
770
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" |
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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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parents:
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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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parents:
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" |
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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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25 |
COPYRIGHT (c) 1995 by Stefan Vogel / Claus Gittinger |
7b6c00a4708a
documentation / example methods merged into one (easier to browse for category "examples")
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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|
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documentation / example methods merged into one (easier to browse for category "examples")
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parents:
770
diff
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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
|
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hereby transferred. |
7b6c00a4708a
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")
Claus Gittinger <cg@exept.de>
parents:
770
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parents:
770
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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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757 | 38 |
documentation |
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" |
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parents:
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40 |
SemaphoreSets allow waiting until one of several semaphores become available. |
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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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They provide a waiting protocol compatible to Semaphore, i.e. #wait and |
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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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#waitWithTimeOut. |
1273 | 43 |
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[see also:] |
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Semaphore |
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Process ProcessorScheduler |
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" |
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! |
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||
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examples |
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Fix cleanup after process resume in SemaphoreSet.
Stefan Vogel <sv@exept.de>
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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the following example forks a process which waits on any |
7b6c00a4708a
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. |
7b6c00a4708a
documentation / example methods merged into one (easier to browse for category "examples")
Claus Gittinger <cg@exept.de>
parents:
770
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--------------------------------------------------------------- |
7b6c00a4708a
documentation / example methods merged into one (easier to browse for category "examples")
Claus Gittinger <cg@exept.de>
parents:
770
diff
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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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|sema1 sema2 semaSet proc| |
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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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documentation / example methods merged into one (easier to browse for category "examples")
Claus Gittinger <cg@exept.de>
parents:
770
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sema1 := Semaphore new. |
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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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sema2 := Semaphore new. |
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Claus Gittinger <cg@exept.de>
parents:
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semaSet := SemaphoreSet with:sema1 with:sema2. |
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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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61 |
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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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proc := [ |
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Claus Gittinger <cg@exept.de>
parents:
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[ |
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Claus Gittinger <cg@exept.de>
parents:
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|ret name| |
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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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65 |
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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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ret := semaSet wait. |
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Claus Gittinger <cg@exept.de>
parents:
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ret == sema1 ifTrue:[ |
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Claus Gittinger <cg@exept.de>
parents:
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name := 'sema1' |
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Claus Gittinger <cg@exept.de>
parents:
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] ifFalse:[ |
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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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ret == sema2 ifTrue:[ |
7b6c00a4708a
documentation / example methods merged into one (easier to browse for category "examples")
Claus Gittinger <cg@exept.de>
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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parents:
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]. |
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Claus Gittinger <cg@exept.de>
parents:
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74 |
Transcript showCr: name, ' raised'. |
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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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75 |
ret == sema2 ifTrue:[ |
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Claus Gittinger <cg@exept.de>
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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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parents:
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(Delay forSeconds:3) wait. |
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Claus Gittinger <cg@exept.de>
parents:
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sema2 signal. |
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parents:
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86 |
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parents:
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87 |
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parents:
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88 |
the following example forks a process which waits on any |
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Claus Gittinger <cg@exept.de>
parents:
770
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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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Claus Gittinger <cg@exept.de>
parents:
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Fix cleanup after process resume in SemaphoreSet.
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|sema1 sema2 semaSet proc| |
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Stefan Vogel <sv@exept.de>
parents:
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Stefan Vogel <sv@exept.de>
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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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parents:
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proc := [ |
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[ |
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|ret name| |
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|
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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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parents:
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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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parents:
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] ifFalse:[ |
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name := ret printString |
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] |
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]. |
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112 |
Transcript showCr: name, ' raised'. |
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parents:
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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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parents:
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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. |
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parents:
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diff
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sema2 signal. |
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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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|
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|q1 q2 semaSet proc| |
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133 |
|
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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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] |
151 |
]. |
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] loop |
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] fork. |
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(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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" |
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164 |
|
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|
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! |
167 |
||
168 |
history |
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"Created: 14.12.1995 / 12:23:21 / stefan" |
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! ! |
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!SemaphoreSet methodsFor:'wait'! |
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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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177 |
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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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[ |
186 |
gotSema := self detect:[:sema| |
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sema checkAndRegisterProcess:currentProcess |
|
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] ifNone:[ |
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registeredAllSemas := true. |
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currentProcess suspendWithState:#wait. |
|
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nil |
|
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]. |
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] doWhile:[gotSema isNil]. |
|
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" |
196 |
we finaly got at least one of our semaphores. |
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Now unregister from any semaphore, we are registered on. |
|
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" |
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199 |
self detect:[:sema| |
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(sema == gotSema) ifTrue:[ |
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registeredAllSemas not |
|
202 |
] ifFalse:[ |
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sema unregisterProcess:currentProcess. |
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false |
|
205 |
] |
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206 |
] ifNone:[]. |
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] valueNowOrOnUnwindDo:[ |
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wasBlocked ifFalse:[OperatingSystem unblockInterrupts]. |
|
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]. |
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^ gotSema |
212 |
||
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"Modified: 15.12.1995 / 23:10:07 / stefan" |
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"Modified: 28.2.1996 / 21:25:54 / cg" |
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215 |
! |
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216 |
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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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220 |
|
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|currentProcess gotSema wasBlocked now endTime unblock timeoutOccured registeredAllSemas| |
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222 |
|
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223 |
currentProcess := Processor activeProcess. |
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224 |
timeoutOccured := false. |
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registeredAllSemas := false. |
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226 |
|
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wasBlocked := OperatingSystem blockInterrupts. |
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[ |
229 |
seconds notNil ifTrue:[ |
|
230 |
" |
|
231 |
calculate the end-time |
|
232 |
" |
|
233 |
now := OperatingSystem getMillisecondTime. |
|
234 |
endTime := OperatingSystem millisecondTimeAdd:now and:(seconds * 1000). |
|
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235 |
|
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unblock := [timeoutOccured := true. Processor resume:currentProcess]. |
237 |
Processor addTimedBlock:unblock for:currentProcess atMilliseconds:endTime. |
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238 |
]. |
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239 |
|
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[ |
241 |
gotSema := self detect:[:sema| |
|
242 |
sema checkAndRegisterProcess:currentProcess |
|
243 |
] ifNone:[ |
|
244 |
registeredAllSemas := true. |
|
245 |
currentProcess suspendWithState:#wait. |
|
246 |
nil |
|
247 |
]. |
|
248 |
] doWhile:[gotSema isNil and:[timeoutOccured not]]. |
|
249 |
||
250 |
(timeoutOccured not and:[unblock notNil]) ifTrue:[ |
|
251 |
Processor removeTimedBlock:unblock. |
|
252 |
]. |
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253 |
|
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" |
255 |
we finaly got at least one of our semaphores. |
|
256 |
Now unregister from any semaphore, we are registered on. |
|
257 |
" |
|
258 |
self detect:[:sema| |
|
259 |
(sema == gotSema) ifTrue:[ |
|
260 |
registeredAllSemas not |
|
261 |
] ifFalse:[ |
|
262 |
sema unregisterProcess:currentProcess. |
|
263 |
false |
|
264 |
] |
|
265 |
] ifNone:[]. |
|
266 |
] valueNowOrOnUnwindDo:[ |
|
267 |
wasBlocked ifFalse:[OperatingSystem unblockInterrupts]. |
|
268 |
]. |
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269 |
^ gotSema |
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270 |
|
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271 |
"Modified: 15.12.1995 / 23:10:54 / stefan" |
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"Modified: 28.2.1996 / 21:26:19 / cg" |
757 | 273 |
! ! |
274 |
||
275 |
!SemaphoreSet class methodsFor:'documentation'! |
|
276 |
||
277 |
version |
|
1273 | 278 |
^ '$Header: /cvs/stx/stx/libbasic/SemaphoreSet.st,v 1.6 1996-04-23 19:32:25 cg Exp $' |
757 | 279 |
! ! |