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<div class="header">
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<a href="#define-members">Macros</a> &#124;
<a href="#func-members">Functions</a> &#124;
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<div class="title">tasking.c File Reference</div> </div>
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<div class="textblock"><code>#include &quot;<a class="el" href="halt_8h_source.html">cpu/halt.h</a>&quot;</code><br />
<code>#include &quot;<a class="el" href="paging_8h_source.html">cpu/paging.h</a>&quot;</code><br />
<code>#include &quot;<a class="el" href="serial_8h_source.html">cpu/serial.h</a>&quot;</code><br />
<code>#include &quot;<a class="el" href="tasking__helpers_8h_source.html">cpu/tasking_helpers.h</a>&quot;</code><br />
<code>#include &quot;<a class="el" href="kmalloc_8h_source.html">kmalloc.h</a>&quot;</code><br />
<code>#include &quot;<a class="el" href="tasking_8h_source.html">tasking.h</a>&quot;</code><br />
<code>#include &lt;sys/types.h&gt;</code><br />
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Macros</h2></td></tr>
<tr class="memitem:a0e92bfcd9e51ca39bbebc3dfb9c16014"><td class="memItemLeft" align="right" valign="top"><a id="a0e92bfcd9e51ca39bbebc3dfb9c16014"></a>
#define&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="tasking_8c.html#a0e92bfcd9e51ca39bbebc3dfb9c16014">MAX_PROCS</a>&#160;&#160;&#160;32768</td></tr>
<tr class="memdesc:a0e92bfcd9e51ca39bbebc3dfb9c16014"><td class="mdescLeft">&#160;</td><td class="mdescRight">Maximum number of processes that can be running at a time. <br /></td></tr>
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#define&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="tasking_8c.html#a707e5829cfbdaede08d2fdcd44c2d987">HAS_UNBLOCKED_THREADS</a>(proc)&#160;&#160;&#160;(proc-&gt;num_threads!=proc-&gt;num_threads_blocked)</td></tr>
<tr class="memdesc:a707e5829cfbdaede08d2fdcd44c2d987"><td class="mdescLeft">&#160;</td><td class="mdescRight">Macro to check whethe a process has unblocked threads. <br /></td></tr>
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#define&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="tasking_8c.html#ac4810428cfd4d217c8c07e8d7142509f">NUM_UNBLOCKED_THREADS</a>(proc)&#160;&#160;&#160;(proc-&gt;num_threads-proc-&gt;num_threads_blocked)</td></tr>
<tr class="memdesc:ac4810428cfd4d217c8c07e8d7142509f"><td class="mdescLeft">&#160;</td><td class="mdescRight">Macro to get the number of unblocked threads for a process. <br /></td></tr>
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#define&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="tasking_8c.html#ad274a1a236e5a5d3a1be62f9d1f6eeec">SAME_PROC</a>(thread1, thread2)&#160;&#160;&#160;(thread1-&gt;process-&gt;pid==thread2-&gt;process-&gt;pid)</td></tr>
<tr class="memdesc:ad274a1a236e5a5d3a1be62f9d1f6eeec"><td class="mdescLeft">&#160;</td><td class="mdescRight">Macro to check whether two threads have the same PID. <br /></td></tr>
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#define&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="tasking_8c.html#af8b29f74b3134b814dd82f5e36871627">SAME_THREAD</a>(thread1, thread2)&#160;&#160;&#160;(thread1-&gt;process-&gt;pid==thread2-&gt;process-&gt;pid&amp;&amp;thread1-&gt;tid==thread2-&gt;tid)</td></tr>
<tr class="memdesc:af8b29f74b3134b814dd82f5e36871627"><td class="mdescLeft">&#160;</td><td class="mdescRight">Macro to check whether two threads have the same PID and TID. <br /></td></tr>
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Functions</h2></td></tr>
<tr class="memitem:a4fe00345b6be4d48d67c8d07112fd3a1"><td class="memItemLeft" align="right" valign="top">static char&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="tasking_8c.html#a4fe00345b6be4d48d67c8d07112fd3a1">is_proc_scheduled</a> (pid_t index)</td></tr>
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<tr class="memitem:a3c8c11f9a0587bbfe09e2a348301849a"><td class="memItemLeft" align="right" valign="top">static void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="tasking_8c.html#a3c8c11f9a0587bbfe09e2a348301849a">mark_proc_scheduled</a> (pid_t index)</td></tr>
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<tr class="memitem:ad3a9873876af082690bffdb92292c7d6"><td class="memItemLeft" align="right" valign="top">static void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="tasking_8c.html#ad3a9873876af082690bffdb92292c7d6">unmark_proc_scheduled</a> (pid_t index)</td></tr>
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<tr class="memitem:aab3a61933f2bb9b94aee37b3cd078740"><td class="memItemLeft" align="right" valign="top">void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="tasking_8c.html#aab3a61933f2bb9b94aee37b3cd078740">tasking_create_task</a> (void *eip, void *address_space, char kmode, char param1_exists, void *param1_arg, char param2_exists, void *param2_arg, char isThread)</td></tr>
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<tr class="memitem:a45f6d4112f15e33ba7a0e356f821d056"><td class="memItemLeft" align="right" valign="top">void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="tasking_8c.html#a45f6d4112f15e33ba7a0e356f821d056">tasking_init</a> ()</td></tr>
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<tr class="memitem:a47f424f3474f4298f1d6b65eeee5d0f6"><td class="memItemLeft" align="right" valign="top">char&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="tasking_8c.html#a47f424f3474f4298f1d6b65eeee5d0f6">tasking_is_privleged</a> ()</td></tr>
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<tr class="memitem:a9555a59dc2340ce36ae1a84c984b3af0"><td class="memItemLeft" align="right" valign="top">pid_t&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="tasking_8c.html#a9555a59dc2340ce36ae1a84c984b3af0">tasking_get_PID</a> ()</td></tr>
<tr class="separator:a9555a59dc2340ce36ae1a84c984b3af0"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a347fac6db01ff796e5dc6d1fc44c2eef"><td class="memItemLeft" align="right" valign="top">int *&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="tasking_8c.html#a347fac6db01ff796e5dc6d1fc44c2eef">tasking_get_errno_address</a> ()</td></tr>
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<tr class="memitem:ab4d000931b7ca87b83905b6172471d0e"><td class="memItemLeft" align="right" valign="top">pid_t&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="tasking_8c.html#ab4d000931b7ca87b83905b6172471d0e">tasking_new_thread</a> (void *start, pid_t pid, char param_exists, void *param_arg)</td></tr>
<tr class="separator:ab4d000931b7ca87b83905b6172471d0e"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a92bbbaf5a589e3717ba7f91deaae0071"><td class="memItemLeft" align="right" valign="top">void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="tasking_8c.html#a92bbbaf5a589e3717ba7f91deaae0071">switch_to_thread</a> (<a class="el" href="structThread.html">Thread</a> *thread)</td></tr>
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<tr class="memitem:a78aa02f7e342d1a6f76fb2c692086f50"><td class="memItemLeft" align="right" valign="top">void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="tasking_8c.html#a78aa02f7e342d1a6f76fb2c692086f50">tasking_yield</a> ()</td></tr>
<tr class="separator:a78aa02f7e342d1a6f76fb2c692086f50"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a021c821360fc28b1a509b585f8d21769"><td class="memItemLeft" align="right" valign="top">void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="tasking_8c.html#a021c821360fc28b1a509b585f8d21769">tasking_block</a> (<a class="el" href="tasking_8h.html#a4b1b32c1fc744438f665f0f1932dd207">thread_state</a> newstate)</td></tr>
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<tr class="memitem:a8daf634972bbe78df522aade52c180bf"><td class="memItemLeft" align="right" valign="top">void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="tasking_8c.html#a8daf634972bbe78df522aade52c180bf">tasking_unblock</a> (pid_t pid, pid_t tid)</td></tr>
<tr class="separator:a8daf634972bbe78df522aade52c180bf"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:acf62dd83316df4b63f4a93587c9b791e"><td class="memItemLeft" align="right" valign="top">void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="tasking_8c.html#acf62dd83316df4b63f4a93587c9b791e">tasking_exit</a> (int code)</td></tr>
<tr class="separator:acf62dd83316df4b63f4a93587c9b791e"><td class="memSeparator" colspan="2">&#160;</td></tr>
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<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="var-members"></a>
Variables</h2></td></tr>
<tr class="memitem:a54a60f61f4b468b7e6ef164c4b5ba60b"><td class="memItemLeft" align="right" valign="top"><a id="a54a60f61f4b468b7e6ef164c4b5ba60b"></a>
pid_t&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="tasking_8c.html#a54a60f61f4b468b7e6ef164c4b5ba60b">next_pid</a> =0</td></tr>
<tr class="memdesc:a54a60f61f4b468b7e6ef164c4b5ba60b"><td class="mdescLeft">&#160;</td><td class="mdescRight">PID to use for the next created process. <br /></td></tr>
<tr class="separator:a54a60f61f4b468b7e6ef164c4b5ba60b"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a440d57f12c449097a95746dd9198df5d"><td class="memItemLeft" align="right" valign="top"><a id="a440d57f12c449097a95746dd9198df5d"></a>
size_t&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="tasking_8c.html#a440d57f12c449097a95746dd9198df5d">num_procs</a> =0</td></tr>
<tr class="memdesc:a440d57f12c449097a95746dd9198df5d"><td class="mdescLeft">&#160;</td><td class="mdescRight">Number of non-exited processes. <br /></td></tr>
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<tr class="memitem:a2056bd87e9f442ca57362f1fde5a6fcb"><td class="memItemLeft" align="right" valign="top"><a id="a2056bd87e9f442ca57362f1fde5a6fcb"></a>
<a class="el" href="structProcess.html">Process</a>&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="tasking_8c.html#a2056bd87e9f442ca57362f1fde5a6fcb">processes</a> [<a class="el" href="tasking_8c.html#a0e92bfcd9e51ca39bbebc3dfb9c16014">MAX_PROCS</a>]</td></tr>
<tr class="memdesc:a2056bd87e9f442ca57362f1fde5a6fcb"><td class="mdescLeft">&#160;</td><td class="mdescRight">Array pf processes by PID. <br /></td></tr>
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<tr class="memitem:a2f20bcee38d64c49d899e11e09e8ac1c"><td class="memItemLeft" align="right" valign="top"><a id="a2f20bcee38d64c49d899e11e09e8ac1c"></a>
char&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="tasking_8c.html#a2f20bcee38d64c49d899e11e09e8ac1c">proc_schedule_bmap</a> [<a class="el" href="tasking_8c.html#a0e92bfcd9e51ca39bbebc3dfb9c16014">MAX_PROCS</a>/8]</td></tr>
<tr class="memdesc:a2f20bcee38d64c49d899e11e09e8ac1c"><td class="mdescLeft">&#160;</td><td class="mdescRight">Bitmap of what processes are scheduled. <br /></td></tr>
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<tr class="memitem:aac59f73081d1aff0293b54c543b552ca"><td class="memItemLeft" align="right" valign="top"><a id="aac59f73081d1aff0293b54c543b552ca"></a>
<a class="el" href="structThread.html">Thread</a> *&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="tasking_8c.html#aac59f73081d1aff0293b54c543b552ca">current_thread</a></td></tr>
<tr class="memdesc:aac59f73081d1aff0293b54c543b552ca"><td class="mdescLeft">&#160;</td><td class="mdescRight">Currently running thread. <br /></td></tr>
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<tr class="memitem:a9350c5c9949c166a8e832a5bd09ab644"><td class="memItemLeft" align="right" valign="top"><a id="a9350c5c9949c166a8e832a5bd09ab644"></a>
static <a class="el" href="structThread.html">Thread</a> *&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="tasking_8c.html#a9350c5c9949c166a8e832a5bd09ab644">ready_to_run_head</a> =NULL</td></tr>
<tr class="memdesc:a9350c5c9949c166a8e832a5bd09ab644"><td class="mdescLeft">&#160;</td><td class="mdescRight">Head of the linked list of ready to run threads. <br /></td></tr>
<tr class="separator:a9350c5c9949c166a8e832a5bd09ab644"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:ae219bf3d5df58ccd05cf59c2fefb5f2a"><td class="memItemLeft" align="right" valign="top"><a id="ae219bf3d5df58ccd05cf59c2fefb5f2a"></a>
static <a class="el" href="structThread.html">Thread</a> *&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="tasking_8c.html#ae219bf3d5df58ccd05cf59c2fefb5f2a">ready_to_run_tail</a> =NULL</td></tr>
<tr class="memdesc:ae219bf3d5df58ccd05cf59c2fefb5f2a"><td class="mdescLeft">&#160;</td><td class="mdescRight">Tail of the linked list of ready to run threads. <br /></td></tr>
<tr class="separator:ae219bf3d5df58ccd05cf59c2fefb5f2a"><td class="memSeparator" colspan="2">&#160;</td></tr>
</table>
<h2 class="groupheader">Function Documentation</h2>
<a id="a4fe00345b6be4d48d67c8d07112fd3a1"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a4fe00345b6be4d48d67c8d07112fd3a1">&#9670;&nbsp;</a></span>is_proc_scheduled()</h2>
<div class="memitem">
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<td class="mlabels-left">
<table class="memname">
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<td class="memname">static char is_proc_scheduled </td>
<td>(</td>
<td class="paramtype">pid_t&#160;</td>
<td class="paramname"><em>index</em></td><td>)</td>
<td></td>
</tr>
</table>
</td>
<td class="mlabels-right">
<span class="mlabels"><span class="mlabel">static</span></span> </td>
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<p>Check whether a process is scheduled </p><dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">index</td><td>The PID to check </td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>whether the process is scheduled </dd></dl>
</div>
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<a id="a3c8c11f9a0587bbfe09e2a348301849a"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a3c8c11f9a0587bbfe09e2a348301849a">&#9670;&nbsp;</a></span>mark_proc_scheduled()</h2>
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<td class="memname">static void mark_proc_scheduled </td>
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<td class="paramtype">pid_t&#160;</td>
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<p>Mark a process as scheduled </p><dl class="params"><dt>Parameters</dt><dd>
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<tr><td class="paramname">index</td><td>The PID to mark </td></tr>
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<h2 class="memtitle"><span class="permalink"><a href="#a92bbbaf5a589e3717ba7f91deaae0071">&#9670;&nbsp;</a></span>switch_to_thread()</h2>
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<td class="memname">void switch_to_thread </td>
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<p>Switch to a thread and schedule the next ready thread in the current process, if there is one. </p><dl class="params"><dt>Parameters</dt><dd>
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<tr><td class="paramname">thread</td><td>The thread to switch to </td></tr>
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<h2 class="memtitle"><span class="permalink"><a href="#a021c821360fc28b1a509b585f8d21769">&#9670;&nbsp;</a></span>tasking_block()</h2>
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<td class="memname">void tasking_block </td>
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<td class="paramtype"><a class="el" href="tasking_8h.html#a4b1b32c1fc744438f665f0f1932dd207">thread_state</a>&#160;</td>
<td class="paramname"><em>newstate</em></td><td>)</td>
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<p>Block the current thread &amp; yield </p><dl class="params"><dt>Parameters</dt><dd>
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<tr><td class="paramname">newstate</td><td>The state to block it in </td></tr>
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<h2 class="memtitle"><span class="permalink"><a href="#aab3a61933f2bb9b94aee37b3cd078740">&#9670;&nbsp;</a></span>tasking_create_task()</h2>
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<td class="memname">void tasking_create_task </td>
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<td class="paramtype">void *&#160;</td>
<td class="paramname"><em>eip</em>, </td>
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<td class="paramtype">void *&#160;</td>
<td class="paramname"><em>address_space</em>, </td>
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<td class="paramtype">char&#160;</td>
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<td class="paramtype">char&#160;</td>
<td class="paramname"><em>param1_exists</em>, </td>
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<td class="paramtype">void *&#160;</td>
<td class="paramname"><em>param1_arg</em>, </td>
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<td class="paramtype">char&#160;</td>
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<td class="paramtype">void *&#160;</td>
<td class="paramname"><em>param2_arg</em>, </td>
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<td class="paramtype">char&#160;</td>
<td class="paramname"><em>isThread</em>&#160;</td>
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<p>Create a task </p><dl class="params"><dt>Parameters</dt><dd>
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<tr><td class="paramname">eip</td><td>The start address of the task </td></tr>
<tr><td class="paramname">address_space</td><td>The address space of the task </td></tr>
<tr><td class="paramname">kmode</td><td>Whether the task is a kernel mode task </td></tr>
<tr><td class="paramname">param1_exists</td><td>Whether param1_arg is a valid value </td></tr>
<tr><td class="paramname">param1_arg</td><td>The thread's start function first parameter </td></tr>
<tr><td class="paramname">param2_exists</td><td>Whether param2_arg is a valid value </td></tr>
<tr><td class="paramname">param2_arg</td><td>The thread's start function second parameter/ </td></tr>
<tr><td class="paramname">isThread</td><td>Whether we are creating a new process or a thread in a process. If we are creating a theead, param2_arg becomes the PID for the newly created thread, and param2_exists must be 0. </td></tr>
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<h2 class="memtitle"><span class="permalink"><a href="#acf62dd83316df4b63f4a93587c9b791e">&#9670;&nbsp;</a></span>tasking_exit()</h2>
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<td class="memname">void tasking_exit </td>
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<p>Terminate the current thread If the main thread terminates, the whole process terminates. </p><dl class="section note"><dt>Note</dt><dd>Currently, calling tasking_exit from any thread terminates the whole process. </dd></dl>
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<tr><td class="paramname">code</td><td>The exit code of the thread </td></tr>
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<h2 class="memtitle"><span class="permalink"><a href="#a347fac6db01ff796e5dc6d1fc44c2eef">&#9670;&nbsp;</a></span>tasking_get_errno_address()</h2>
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<td class="memname">int* tasking_get_errno_address </td>
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<p>Get the adddress of errno for the current thread </p><dl class="section return"><dt>Returns</dt><dd>The address of errno </dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#a9555a59dc2340ce36ae1a84c984b3af0">&#9670;&nbsp;</a></span>tasking_get_PID()</h2>
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<td class="memname">pid_t tasking_get_PID </td>
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<p>Get the PID of the current thread. </p><dl class="section return"><dt>Returns</dt><dd>The current thread's PID </dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#a45f6d4112f15e33ba7a0e356f821d056">&#9670;&nbsp;</a></span>tasking_init()</h2>
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<td class="memname">void tasking_init </td>
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<p>Initialize tasking </p>
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<h2 class="memtitle"><span class="permalink"><a href="#a47f424f3474f4298f1d6b65eeee5d0f6">&#9670;&nbsp;</a></span>tasking_is_privleged()</h2>
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<td class="memname">char tasking_is_privleged </td>
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<p>Check whether the current process is privleged </p><dl class="section return"><dt>Returns</dt><dd>whether the current process is privleged </dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#ab4d000931b7ca87b83905b6172471d0e">&#9670;&nbsp;</a></span>tasking_new_thread()</h2>
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<td class="memname">pid_t tasking_new_thread </td>
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<td class="paramtype">void *&#160;</td>
<td class="paramname"><em>start</em>, </td>
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<td class="paramtype">pid_t&#160;</td>
<td class="paramname"><em>pid</em>, </td>
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<td class="paramtype">char&#160;</td>
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<td class="paramtype">void *&#160;</td>
<td class="paramname"><em>param_arg</em>&#160;</td>
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<p>Create a new thread </p><dl class="params"><dt>Parameters</dt><dd>
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<tr><td class="paramname">start</td><td>The start address of the task </td></tr>
<tr><td class="paramname">pid</td><td>The PID that gets the new thread </td></tr>
<tr><td class="paramname">param_exists</td><td>Whether param_arg is a valid value </td></tr>
<tr><td class="paramname">param_arg</td><td>The thread's start function parameter </td></tr>
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<dl class="section return"><dt>Returns</dt><dd>the TID of the thread </dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#a8daf634972bbe78df522aade52c180bf">&#9670;&nbsp;</a></span>tasking_unblock()</h2>
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<td class="memname">void tasking_unblock </td>
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<td class="paramname"><em>tid</em>&#160;</td>
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<p>Unblock a thread </p><dl class="params"><dt>Parameters</dt><dd>
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<tr><td class="paramname">pid</td><td>The PID that contains the thread to unblock </td></tr>
<tr><td class="paramname">tid</td><td>The TID in the process to unblock. </td></tr>
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<h2 class="memtitle"><span class="permalink"><a href="#a78aa02f7e342d1a6f76fb2c692086f50">&#9670;&nbsp;</a></span>tasking_yield()</h2>
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<td class="memname">void tasking_yield </td>
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<p>Yield to the next ready thread in any process </p>
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<h2 class="memtitle"><span class="permalink"><a href="#ad3a9873876af082690bffdb92292c7d6">&#9670;&nbsp;</a></span>unmark_proc_scheduled()</h2>
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<td class="memname">static void unmark_proc_scheduled </td>
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<td class="paramtype">pid_t&#160;</td>
<td class="paramname"><em>index</em></td><td>)</td>
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<p>Unmark a process as scheduled </p><dl class="params"><dt>Parameters</dt><dd>
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<tr><td class="paramname">index</td><td>The PID to unmark </td></tr>
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</dd>
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