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<a name="1204879"> </a><font color="#003366" face="Verdana, Arial, Helvetica, sans-serif">1.6 Semaphores</font>
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<a name="1204883"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">OS20 uses semaphores to synchronize multiple tasks. They can be used to ensure mutual exclusion and control access to a shared resource.</font>
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<a name="1204884"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">Semaphores may also be used for synchronization between interrupt handlers and tasks and to synchronize the activity of low priority tasks with high priority processes.</font>
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<a name="1204888"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">Semaphores are described in more detail in <a href="sem.htm#1204413"><font color="#0000ff" face="Verdana, Arial, Helvetica, sans-serif"><i>Chapter⌨️ 快捷键说明
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