mem4.htm

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  <a name="1204523"> </a><font color="#003366"  face="Verdana, Arial, Helvetica, sans-serif">4.3 	 Predefined partitions</font>
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<p>
  <a name="1204527"> </a><font size=2  face="Verdana, Arial, Helvetica, sans-serif">OS20 has been designed not to require any dynamic memory allocation itself. This allows the construction of deterministic systems, or for the user to take over all memory allocation.</font>
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  <a name="1204528"> </a><font size=2  face="Verdana, Arial, Helvetica, sans-serif">However, for convenience, all of the object initialization functions (for example, <font size=2 face=Courier><strong>task_init</strong></font>, <font size=2 face=Courier><strong>semaphore_init_fifo</strong></font>) are also available with a creation style of interface (for example, <font size=2 face=Courier><strong>task_create</strong></font>, <font size=2 face=Courier><strong>semaphore_create_fifo</strong></font>), where OS20 performs the memory allocation for the object. In these cases OS20 uses two predefined partitions.</font>
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<p>  <font size=2  face="Verdana, Arial, Helvetica, sans-serif"><li ><a name="1204535"> </a>The <font size=2 face=Courier><strong>system_partition</strong></font> is used for all object allocation, including semaphores, message queues and the static portion of the task's data structure, including the task's stack. Normally this is managed as a heap partition.</font></p>
<p>  <font size=2  face="Verdana, Arial, Helvetica, sans-serif"><li ><a name="1204536"> </a>The <font size=2 face=Courier><strong>internal_partition</strong></font> is used just for the allocation of the dynamic part of a task's data structure by <font size=2 face=Courier><strong>task_create</strong></font>. To minimize context switch time, this data should be placed in internal memory (see <a href="task2.htm#1204486"><font  color="#0000ff" face="Verdana, Arial, Helvetica, sans-serif"><i>Section

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