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-<h2>vm_msync</h2>
-<hr>
-<p>
-<strong>Function</strong> - Synchronize the specified region of virtual memory.
-<h3>SYNOPSIS</h3>
-<pre>
-<strong>kern_return_t vm_msync</strong>
- <strong>(vm_task_t</strong> <var>target_task</var>,
- <strong>vm_address_t</strong> <var>address</var>,
- <strong>vm_size_t</strong> <var>size</var>,
- <strong>target_task</strong> <var>sync_flags</var><strong>);</strong>
-</pre>
-<h3>PARAMETERS</h3>
-<dl>
-<p>
-<dt> <var>target_task</var>
-<dd>
-[in task send right]
-The port for the task whose address space contains
-the region.
-<p>
-<dt> <var>address</var>
-<dd>
-[in scalar]
-The starting address for the region.
-<p>
-<dt> <var>size</var>
-<dd>
-[in scalar]
-The number of bytes in the region.
-<p>
-<dt> <var>sync_flags</var>
-<dd>
-[in scalar]
-The bit-wise <strong>OR</strong> of flags affecting the synchronization.
-Specifying both <strong>VM_SYNC_SYNCHRONOUS</strong> and
-<strong>VM_SYNC_ASYNCHRONOUS</strong> is invalid.
-<dl>
-<p>
-<dt> <strong>VM_SYNC_INVALIDATE</strong>
-<dd>
-Flushes pages in the range. Only precious pages are returned to
-the memory manager unless either <strong>VM_SYNC_SYNCHRONOUS</strong> or
-<strong>VM_SYNC_ASYNCHRONOUS</strong> is also set.
-<p>
-<dt> <strong>VM_SYNC_SYNCHRONOUS</strong>
-<dd>
-Writes dirty and precious pages back to the memory manager,
-waits for pages to reach backing storage.
-<p>
-<dt> <strong>VM_SYNC_ASYNCHRONOUS</strong>
-<dd>
-Writes dirty and precious pages back to the memory manager,
-returns without waiting for pages to reach backing storage.
-</dl>
-</dl>
-<h3>DESCRIPTION</h3>
-<p>
-The <strong>vm_msync</strong> function synchronizes the contents of
-a memory range with its
-backing store image by flushing or cleaning the contents of the
-specified range
-to the range's memory manager, engaging in a synchronization protocol with
-the manager (<strong>memory_object_synchronize</strong>).
-The client does not return from
-this call until the memory manager responds (to the kernel) with
-<strong>memory_object_synchronize_completed</strong>.
-<h3>NOTES</h3>
-<p>
-This interface is machine word length specific because of the virtual address
-parameter.
-<h3>RETURN VALUES</h3>
-<dl>
-<p>
-<dt> <strong>KERN_INVALID_ADDRESS</strong>
-<dd>
-The address is illegal or specifies a non-allocated region.
-</dl>
-<h3>RELATED INFORMATION</h3>
-<p>
-Functions:
-<a href="memory_object_synchronize.html"><strong>memory_object_synchronize</strong></a>,
-<a href="MO_SY_completed.html"><strong>memory_object_synchronize_completed</strong></a>.