2017-09-13 04:42:36 +08:00
<?xml version="1.0" encoding="UTF-8" ?>
2021-06-05 00:03:15 +08:00
<class name= "Semaphore" inherits= "RefCounted" version= "4.0" >
2017-09-13 04:42:36 +08:00
<brief_description >
2019-06-22 07:04:47 +08:00
A synchronization semaphore.
2017-09-13 04:42:36 +08:00
</brief_description>
<description >
2019-06-22 07:04:47 +08:00
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].
2017-09-13 04:42:36 +08:00
</description>
<tutorials >
2021-11-15 17:43:07 +08:00
<link title= "Using multiple threads" > $DOCS_URL/tutorials/performance/using_multiple_threads.html</link>
2017-09-13 04:42:36 +08:00
</tutorials>
<methods >
<method name= "post" >
2021-07-30 21:28:05 +08:00
<return type= "void" />
2017-09-13 04:42:36 +08:00
<description >
2020-03-03 16:26:42 +08:00
Lowers the [Semaphore], allowing one more thread in.
2017-09-13 04:42:36 +08:00
</description>
</method>
2020-03-09 17:12:53 +08:00
<method name= "try_wait" >
2021-07-30 21:28:05 +08:00
<return type= "int" enum= "Error" />
2020-03-03 16:26:42 +08:00
<description >
2020-03-09 17:12:53 +08:00
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.
2020-03-03 16:26:42 +08:00
</description>
</method>
2020-03-09 17:12:53 +08:00
<method name= "wait" >
2021-07-30 21:28:05 +08:00
<return type= "void" />
2017-09-13 04:42:36 +08:00
<description >
2020-03-09 17:12:53 +08:00
Waits for the [Semaphore], if its value is zero, blocks until non-zero.
2017-09-13 04:42:36 +08:00
</description>
</method>
</methods>
</class>