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<div class="headertitle"><div class="title">l4_thread_regs_t Struct Reference<div class="ingroups"><a class="el" href="group__l4__api.html">Base API</a> » <a class="el" href="group__l4__ipc__api.html">Object Invocation</a> » <a class="el" href="group__l4__utcb__api.html">Virtual Registers (UTCBs)</a> » <a class="el" href="group__l4__utcb__tcr__api.html">Thread Control Registers (TCRs)</a></div></div></div>
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<p>Encapsulation of the thread-control-register block of the UTCB.
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<a href="#details">More...</a></p>
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<p><code>#include <<a class="el" href="l4_2sys_2utcb_8h_source.html">utcb.h</a>></code></p>
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<div id="dynsection-0" onclick="return dynsection.toggleVisibility(this)" class="dynheader closed" style="cursor:pointer;"><span class="dynarrow"><span class="arrowhead closed"></span></span>Collaboration diagram for l4_thread_regs_t:</div>
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<div class="center"><iframe scrolling="no" loading="lazy" frameborder="0" src="structl4__thread__regs__t__coll__graph.svg" width="134" height="116"><p><b>This browser is not able to show SVG: try Firefox, Chrome, Safari, or Opera instead.</b></p></iframe></div>
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<table class="memberdecls">
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<tr class="heading"><td colspan="2"><h2 id="header-pub-attribs" class="groupheader"><a id="pub-attribs" name="pub-attribs"></a>
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Data Fields</h2></td></tr>
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<tr class="memitem:a5938a98c49f9b75e46046b36e6f65e89" id="r_a5938a98c49f9b75e46046b36e6f65e89"><td class="memItemLeft" align="right" valign="top"><a class="el" href="group__l4__basic__types.html#ga1c2c4b333f75b1d05b59855910f2b9cb">l4_umword_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="#a5938a98c49f9b75e46046b36e6f65e89">error</a></td></tr>
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<tr class="memdesc:a5938a98c49f9b75e46046b36e6f65e89"><td class="mdescLeft"> </td><td class="mdescRight">System call error code (see <a class="el" href="group__l4__ipc__err__api.html#ga896e67446a2348545f520c46a775c3c3" title="Error codes in the error TCR.">l4_ipc_tcr_error_t</a>). <br /></td></tr>
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<tr class="memitem:a50e81e415f7d4ca398b320f9e9d507be" id="r_a50e81e415f7d4ca398b320f9e9d507be"><td class="memItemLeft" align="right" valign="top"><a class="el" href="group__l4__basic__types.html#ga1c2c4b333f75b1d05b59855910f2b9cb">l4_umword_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="#a50e81e415f7d4ca398b320f9e9d507be">free_marker</a></td></tr>
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<tr class="memdesc:a50e81e415f7d4ca398b320f9e9d507be"><td class="mdescLeft"> </td><td class="mdescRight">Kernel free marker. <br /></td></tr>
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<tr class="memitem:aed661adcf9bc544584d9104741cd9908" id="r_aed661adcf9bc544584d9104741cd9908"><td class="memItemLeft" align="right" valign="top"><a id="aed661adcf9bc544584d9104741cd9908" name="aed661adcf9bc544584d9104741cd9908"></a>
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<a class="el" href="group__l4__basic__types.html#ga1c2c4b333f75b1d05b59855910f2b9cb">l4_umword_t</a> </td><td class="memItemRight" valign="bottom"><b>user</b> [3]</td></tr>
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<tr class="memdesc:aed661adcf9bc544584d9104741cd9908"><td class="mdescLeft"> </td><td class="mdescRight">User values (ignored and preserved by the kernel). <br /></td></tr>
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</table>
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<a name="details" id="details"></a><h2 id="header-details" class="groupheader">Detailed Description</h2>
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<div class="textblock"><p>Encapsulation of the thread-control-register block of the UTCB. </p>
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<p class="definition">Definition at line <a class="el" href="l4_2sys_2utcb_8h_source.html#l00099">99</a> of file <a class="el" href="l4_2sys_2utcb_8h_source.html">utcb.h</a>.</p>
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</div><a name="doc-variable-members" id="doc-variable-members"></a><h2 id="header-doc-variable-members" class="groupheader">Field Documentation</h2>
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<a id="a5938a98c49f9b75e46046b36e6f65e89" name="a5938a98c49f9b75e46046b36e6f65e89"></a>
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<h2 class="memtitle"><span class="permalink"><a href="#a5938a98c49f9b75e46046b36e6f65e89">◆ </a></span>error</h2>
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<td class="memname"><a class="el" href="group__l4__basic__types.html#ga1c2c4b333f75b1d05b59855910f2b9cb">l4_umword_t</a> l4_thread_regs_t::error</td>
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<p>System call error code (see <a class="el" href="group__l4__ipc__err__api.html#ga896e67446a2348545f520c46a775c3c3" title="Error codes in the error TCR.">l4_ipc_tcr_error_t</a>). </p>
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<p>If the kernel indicates an error in the message tag (see <a class="el" href="group__l4__msgtag__api.html#ga52e71bb66855f4d78fa5c82b5f0c5a87" title="Test for error indicator flag.">l4_msgtag_has_error()</a> and <a class="el" href="structl4__msgtag__t.html#a433eb16b19202d09cc98b40a139b3c29" title="Test if flags indicate an error.">l4_msgtag_t::has_error()</a>), the kernel writes the error code to this field. </p>
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<p class="definition">Definition at line <a class="el" href="l4_2sys_2utcb_8h_source.html#l00106">106</a> of file <a class="el" href="l4_2sys_2utcb_8h_source.html">utcb.h</a>.</p>
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<a id="a50e81e415f7d4ca398b320f9e9d507be" name="a50e81e415f7d4ca398b320f9e9d507be"></a>
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<h2 class="memtitle"><span class="permalink"><a href="#a50e81e415f7d4ca398b320f9e9d507be">◆ </a></span>free_marker</h2>
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<td class="memname"><a class="el" href="group__l4__basic__types.html#ga1c2c4b333f75b1d05b59855910f2b9cb">l4_umword_t</a> l4_thread_regs_t::free_marker</td>
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<p>Kernel free marker. </p>
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<p>The kernel sets this field to zero as soon as it is guaranteed that the kernel does not use the UTCB anymore for the bound thread. This usually happens while a thread is deleted. However, it is not defined when exactly the kernel sets the field. In particular, the point in time is not necessarily related to any IPC.</p>
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<p>Userland may use this field for determining if a UTCB can be re-used for another thread. Note that, in order to make use of that feature, userland has to set this field to a non-zero value when a thread is bound with this UTCB. </p>
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<p class="definition">Definition at line <a class="el" href="l4_2sys_2utcb_8h_source.html#l00120">120</a> of file <a class="el" href="l4_2sys_2utcb_8h_source.html">utcb.h</a>.</p>
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<hr/>The documentation for this struct was generated from the following file:<ul>
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<li>l4/sys/<a class="el" href="l4_2sys_2utcb_8h_source.html">utcb.h</a></li>
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