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81064cc239
We don't use that info for anything, and it generates unnecessary diffs every time we bump the minor version (and CI failures if we forget to sync some files from opt-in modules (mono, text_server_fb).
38 lines
1.8 KiB
XML
38 lines
1.8 KiB
XML
<?xml version="1.0" encoding="UTF-8" ?>
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<class name="Semaphore" inherits="RefCounted" 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 mechanism used to control access to a shared resource by [Thread]s.
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</brief_description>
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<description>
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A synchronization semaphore that can be used to synchronize multiple [Thread]s. Initialized to zero on creation. For a binary version, see [Mutex].
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[b]Warning:[/b] Semaphores must be used carefully to avoid deadlocks.
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[b]Warning:[/b] To guarantee that the operating system is able to perform proper cleanup (no crashes, no deadlocks), these conditions must be met:
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- When a [Semaphore]'s reference count reaches zero and it is therefore destroyed, no threads must be waiting on it.
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- When a [Thread]'s reference count reaches zero and it is therefore destroyed, it must not be waiting on any semaphore.
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</description>
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<tutorials>
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<link title="Using multiple threads">$DOCS_URL/tutorials/performance/using_multiple_threads.html</link>
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<link title="Thread-safe APIs">$DOCS_URL/tutorials/performance/thread_safe_apis.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="void" />
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<description>
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Lowers the [Semaphore], allowing one more thread in.
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</description>
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</method>
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<method name="try_wait">
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<return type="bool" />
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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 [code]false[/code]. If non-zero, it returns [code]true[/code] 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="void" />
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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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</description>
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</method>
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</methods>
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</class>
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