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<link title="Get" rel="Chapter" href="Get.html"><title>Ocamlnet 4 Reference Manual : Netmcore_process</title>
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<h1>Module <a href="type_Netmcore_process.html">Netmcore_process</a></h1>
<pre><span id="MODULENetmcore_process"><span class="keyword">module</span> Netmcore_process</span>: <code class="code">sig</code> <a href="Netmcore_process.html">..</a> <code class="code">end</code></pre><div class="info module top">
<div class="info-desc">
<p>Statically typed processes</p>
</div>
</div>
<hr width="100%">
<p>This module provides a slightly higher-level view on processes,
but is also a bit more restricted than the primitives in
<a href="Netmcore.html"><code class="code">Netmcore</code></a>.</p>
<p>Please read <a href="Netmcore_basics.html"><code class="code">Netmcore_basics</code></a> for an introduction into using
this module. There is also <a href="Netmcore_tut.html"><code class="code">Netmcore_tut</code></a> with more advanced
techniques.</p>
<pre><span id="TYPEfork_point"><span class="keyword">type</span> <code class="type">'a</code> fork_point</span> </pre>
<div class="info ">
<div class="info-desc">
<p>A fork point can start a new process with argument <code class="code">'a</code></p>
</div>
</div>
<pre><span id="TYPEjoin_point"><span class="keyword">type</span> <code class="type">'b</code> join_point</span> </pre>
<div class="info ">
<div class="info-desc">
<p>A join point can wait until a process finishes with a result <code class="code">'b</code></p>
</div>
</div>
<pre><span id="VALdef_process"><span class="keyword">val</span> def_process</span> : <code class="type">('a -> 'b) -> 'a <a href="Netmcore_process.html#TYPEfork_point">fork_point</a> * 'b <a href="Netmcore_process.html#TYPEjoin_point">join_point</a></code></pre><div class="info ">
<div class="info-desc">
<p><code class="code">let (fp,jp) = def_process proc</code>: Defines a process (which must happen
in the master process), so that:</p>
<ul>
<li><code class="code">let pid = start fp arg</code>: Starts the new process and passes the
argument <code class="code">arg</code> to it. The process runs <code class="code">proc arg</code> which will
finally result in a value <code class="code">r</code></li>
<li><code class="code">let r_opt = join jp pid</code>: Waits until the process identified by
<code class="code">pid</code> finishes, and returns the result as <code class="code">r_opt = Some r</code>.
On error, it returns <code class="code">None</code>.</li>
</ul>
<p><code class="code">def_process</code> should be called at module initialization time
before any process is started. This interface is not designed for
calling <code class="code">def_process</code> later.</p>
</div>
</div>
<pre><span id="VALstart"><span class="keyword">val</span> start</span> : <code class="type">?inherit_resources:<a href="Netmcore.html#TYPEinherit_request">Netmcore.inherit_request</a> -><br> 'a <a href="Netmcore_process.html#TYPEfork_point">fork_point</a> -> 'a -> <a href="Netmcore.html#TYPEprocess_id">Netmcore.process_id</a></code></pre><div class="info ">
<div class="info-desc">
<p><code class="code">let pid = start fp arg</code>: Starts a new process at the fork point
<code class="code">fp</code> with argument <code class="code">arg</code>. This means that the process is forked
from the master process, and that the value of <code class="code">arg</code> is sent to it
using <code class="code">Marshal</code>. The returned process ID is Netmulticore's own
ID and not to be confused with the ID assigned by the operating
system.</p>
<p>Option <code class="code">inherit_resources</code>: Certain resources are only accessible by
the process when they are inherited to it. This is the case for
<code class="code">`Posix_shm_preallocated</code>. This can be set to <code class="code">`All</code> to inherit
all inheritable resources, or to <code class="code">`Resources l</code> to only inherit
the resources of <code class="code">l</code>. By default, no resources are inherited.</p>
</div>
</div>
<pre><span id="VALjoin"><span class="keyword">val</span> join</span> : <code class="type">'b <a href="Netmcore_process.html#TYPEjoin_point">join_point</a> -> <a href="Netmcore.html#TYPEprocess_id">Netmcore.process_id</a> -> 'b option</code></pre><div class="info ">
<div class="info-desc">
<p><code class="code">let r_opt = join jp pid</code>: Waits until the process <code class="code">pid</code> finishes,
and uses the join point <code class="code">jp</code> to extract the result. The result
is returned as <code class="code">Some r</code> on success, and <code class="code">None</code> on error.
Result values are transmitted from the joining process to
this function using <code class="code">Marshal</code>. Errors include uncaught exceptions
as well as unexpected process termination (<code class="code">exit</code>, signal).</p>
<p>If the process referenced by <code class="code">pid</code> is not an instance that belongs
to <code class="code">jp</code>, the function will fail.</p>
<p>This function must not be called from the master process (which is
not allowed to block until a result is available).</p>
</div>
</div>
<pre><span id="VALjoin_nowait"><span class="keyword">val</span> join_nowait</span> : <code class="type">'b <a href="Netmcore_process.html#TYPEjoin_point">join_point</a> -> <a href="Netmcore.html#TYPEprocess_id">Netmcore.process_id</a> -> 'b option</code></pre><div class="info ">
<div class="info-desc">
<p>Like <code class="code">join</code>, but it is not waited for the termination of the process.
If the process is not yet done, this function returns <code class="code">None</code>.
It also returns <code class="code">None</code> if the process terminated with an error or did
not set a result value for other reasons.</p>
<p>Unlike <code class="code">join</code>, this function can be called in the master process.</p>
</div>
</div>
<pre><span id="VALrelease_fork_point"><span class="keyword">val</span> release_fork_point</span> : <code class="type">'a <a href="Netmcore_process.html#TYPEfork_point">fork_point</a> -> unit</code></pre><div class="info ">
<div class="info-desc">
<p>Releases a fork point so it is deleted from the internal
resource table.</p>
</div>
</div>
<pre><span id="VALrelease_join_point"><span class="keyword">val</span> release_join_point</span> : <code class="type">'b <a href="Netmcore_process.html#TYPEjoin_point">join_point</a> -> unit</code></pre><div class="info ">
<div class="info-desc">
<p>Releases a join point so it is deleted from the internal
resource table.</p>
</div>
</div>
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