36 lines
1.6 KiB
XML
36 lines
1.6 KiB
XML
<?xml version="1.0" encoding="UTF-8" ?>
|
|
<class name="Semaphore" inherits="Reference" version="3.6" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../class.xsd">
|
|
<brief_description>
|
|
A synchronization semaphore.
|
|
</brief_description>
|
|
<description>
|
|
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].
|
|
</description>
|
|
<tutorials>
|
|
<link>$DOCS_URL/tutorials/performance/threads/using_multiple_threads.html</link>
|
|
</tutorials>
|
|
<methods>
|
|
<method name="post">
|
|
<return type="int" enum="Error" />
|
|
<description>
|
|
Lowers the [Semaphore], allowing one more thread in.
|
|
[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].
|
|
</description>
|
|
</method>
|
|
<method name="try_wait">
|
|
<return type="int" enum="Error" />
|
|
<description>
|
|
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.
|
|
</description>
|
|
</method>
|
|
<method name="wait">
|
|
<return type="int" enum="Error" />
|
|
<description>
|
|
Waits for the [Semaphore], if its value is zero, blocks until non-zero.
|
|
[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].
|
|
</description>
|
|
</method>
|
|
</methods>
|
|
<constants>
|
|
</constants>
|
|
</class>
|