37 lines
1.6 KiB
XML
37 lines
1.6 KiB
XML
<?xml version="1.0" encoding="UTF-8" ?>
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<class name="Semaphore" inherits="Reference" version="3.5" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../class.xsd">
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<brief_description>
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A synchronization semaphore.
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</brief_description>
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<description>
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A synchronization semaphore which can be used to synchronize multiple [Thread]s. Initialized to zero on creation. Be careful to avoid deadlocks. For a binary version, see [Mutex].
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</description>
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<tutorials>
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<link>$DOCS_URL/tutorials/performance/threads/using_multiple_threads.html</link>
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</tutorials>
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<methods>
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<method name="post">
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<return type="int" enum="Error" />
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<description>
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Lowers the [Semaphore], allowing one more thread in.
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[b]Note:[/b] This method internals' can't possibly fail, but an error code is returned for backwards compatibility, which will always be [constant OK].
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</description>
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</method>
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<method name="try_wait">
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<return type="int" enum="Error" />
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<description>
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Like [method wait], but won't block, so if the value is zero, fails immediately and returns [constant ERR_BUSY]. If non-zero, it returns [constant OK] to report success.
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</description>
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</method>
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<method name="wait">
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<return type="int" enum="Error" />
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<description>
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Waits for the [Semaphore], if its value is zero, blocks until non-zero.
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[b]Note:[/b] This method internals' can't possibly fail, but an error code is returned for backwards compatibility, which will always be [constant OK].
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</description>
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</method>
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</methods>
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<constants>
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</constants>
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</class>
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