author | Mario de Sousa <msousa@fe.up.pt> |
Mon, 06 Jun 2011 14:05:28 +0100 | |
changeset 313 | 90c3772e6547 |
parent 251 | 5e7457efbb8f |
permissions | -rw-r--r-- |
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(* |
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* (c) 2011 Edouard Tisserant |
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* |
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* Fake semaphore support, for non preemptive implementation. |
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* |
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*) |
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FUNCTION_BLOCK SEMA |
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VAR_INPUT |
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CLAIM : BOOL; |
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RELEASE : BOOL; |
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END_VAR |
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VAR_OUTPUT |
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BUSY : BOOL; |
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END_VAR |
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VAR |
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Q_INTERNAL : BOOL; |
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END_VAR |
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Q_INTERNAL := CLAIM OR ( Q_INTERNAL AND (NOT RELEASE)); |
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BUSY := Q_INTERNAL; |
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END_FUNCTION_BLOCK |
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