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<a href="https://gitlab.rtems.org/AlessandroNardin">Alessandro Nardin</a>
commented on a
discussion on <a href="https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/275#note_116976">cpukit/posix/src/aio_suspend.c</a>:
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<td class="new_line diff-line-num new" data-linenumber="110" style="width: 35px; color: rgba(5,5,6,.24); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: inherit;" align="right" bgcolor="#ddfbe6">
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<td class="line_content new" style="padding: inherit;" bgcolor="#ecfdf0"><pre style='display: block; font-size: 14px; color: #28272d; position: relative; font-family: "GitLab Mono","JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;'>+<span id="LC110" class="line" lang="c"> <span class="n" style="color: #333333;">r_chain</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333333;">rtems_aio_search_fd</span><span class="p">(</span> <span class="n" style="color: #333333;">idle_req_chain</span><span class="p">,</span> <span class="n" style="color: #333333;">list</span><span class="p">[</span><span class="n" style="color: #333333;">i</span><span class="p">]</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333333;">aio_fildes</span><span class="p">,</span> <span class="mi" style="color: #009999;">0</span> <span class="p">);</span></span>
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111
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<td class="line_content new" style="padding: inherit;" bgcolor="#ecfdf0"><pre style='display: block; font-size: 14px; color: #28272d; position: relative; font-family: "GitLab Mono","JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;'>+<span id="LC111" class="line" lang="c"> <span class="p">}</span></span>
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112
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<td class="new_line diff-line-num new" data-linenumber="113" style="width: 35px; color: rgba(5,5,6,.24); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: inherit;" align="right" bgcolor="#ddfbe6">
113
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<td class="line_content new" style="padding: inherit;" bgcolor="#ecfdf0"><pre style='display: block; font-size: 14px; color: #28272d; position: relative; font-family: "GitLab Mono","JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;'>+<span id="LC113" class="line" lang="c"> <span class="cm" style="color: #999988; font-style: italic;">/** If not found continue */</span></span>
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<td class="new_line diff-line-num new" data-linenumber="114" style="width: 35px; color: rgba(5,5,6,.24); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: inherit;" align="right" bgcolor="#ddfbe6">
114
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<td class="line_content new" style="padding: inherit;" bgcolor="#ecfdf0"><pre style='display: block; font-size: 14px; color: #28272d; position: relative; font-family: "GitLab Mono","JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;'>+<span id="LC114" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span> <span class="n" style="color: #333333;">r_chain</span> <span class="o" style="font-weight: 600;">==</span> <span class="nb" style="color: #0086b3;">NULL</span> <span class="p">)</span> <span class="p">{</span></span>
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115
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<td class="line_content new" style="padding: inherit;" bgcolor="#ecfdf0"><pre style='display: block; font-size: 14px; color: #28272d; position: relative; font-family: "GitLab Mono","JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;'>+<span id="LC115" class="line" lang="c"> <span class="k" style="font-weight: 600;">continue</span><span class="p">;</span></span>
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116
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<td class="line_content new" style="padding: inherit;" bgcolor="#ecfdf0"><pre style='display: block; font-size: 14px; color: #28272d; position: relative; font-family: "GitLab Mono","JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;'>+<span id="LC116" class="line" lang="c"> <span class="p">}</span></span>
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<td class="new_line diff-line-num new" data-linenumber="117" style="width: 35px; color: rgba(5,5,6,.24); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: inherit;" align="right" bgcolor="#ddfbe6">
117
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<td class="line_content new" style="padding: inherit;" bgcolor="#ecfdf0"><pre style='display: block; font-size: 14px; color: #28272d; position: relative; font-family: "GitLab Mono","JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;'>+<span id="LC117" class="line" lang="c"></span>
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<td class="new_line diff-line-num new" data-linenumber="118" style="width: 35px; color: rgba(5,5,6,.24); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: inherit;" align="right" bgcolor="#ddfbe6">
118
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<td class="line_content new" style="padding: inherit;" bgcolor="#ecfdf0"><pre style='display: block; font-size: 14px; color: #28272d; position: relative; font-family: "GitLab Mono","JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;'>+<span id="LC118" class="line" lang="c"> <span class="cm" style="color: #999988; font-style: italic;">/* Search request in fd_chain */</span></span>
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<td class="new_line diff-line-num new" data-linenumber="119" style="width: 35px; color: rgba(5,5,6,.24); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: inherit;" align="right" bgcolor="#ddfbe6">
119
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<td class="line_content new" style="padding: inherit;" bgcolor="#ecfdf0"><pre style='display: block; font-size: 14px; color: #28272d; position: relative; font-family: "GitLab Mono","JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;'>+<span id="LC119" class="line" lang="c"> <span class="n" style="color: #333333;">request</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333333;">rtems_aio_search_in_chain</span><span class="p">(</span> <span class="n" style="color: #333333;">list</span><span class="p">[</span><span class="n" style="color: #333333;">i</span><span class="p">],</span> <span class="o" style="font-weight: 600;">&</span><span class="n" style="color: #333333;">r_chain</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333333;">perfd</span> <span class="p">);</span></span>
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<td class="new_line diff-line-num new" data-linenumber="120" style="width: 35px; color: rgba(5,5,6,.24); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: inherit;" align="right" bgcolor="#ddfbe6">
120
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<td class="line_content new" style="padding: inherit;" bgcolor="#ecfdf0"><pre style='display: block; font-size: 14px; color: #28272d; position: relative; font-family: "GitLab Mono","JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;'>+<span id="LC120" class="line" lang="c"> </span>
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<td class="new_line diff-line-num new" data-linenumber="121" style="width: 35px; color: rgba(5,5,6,.24); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: inherit;" align="right" bgcolor="#ddfbe6">
121
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<td class="line_content new" style="padding: inherit;" bgcolor="#ecfdf0"><pre style='display: block; font-size: 14px; color: #28272d; position: relative; font-family: "GitLab Mono","JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;'>+<span id="LC121" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span> <span class="n" style="color: #333333;">request</span> <span class="o" style="font-weight: 600;">!=</span> <span class="nb" style="color: #0086b3;">NULL</span> <span class="p">)</span> <span class="p">{</span></span>
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<td class="new_line diff-line-num new" data-linenumber="122" style="width: 35px; color: rgba(5,5,6,.24); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: inherit;" align="right" bgcolor="#ddfbe6">
122
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<td class="line_content new" style="padding: inherit;" bgcolor="#ecfdf0"><pre style='display: block; font-size: 14px; color: #28272d; position: relative; font-family: "GitLab Mono","JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;'>+<span id="LC122" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span> <span class="n" style="color: #333333;">request</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333333;">suspendcbp</span> <span class="o" style="font-weight: 600;">==</span> <span class="nb" style="color: #0086b3;">NULL</span> <span class="p">)</span> <span class="p">{</span></span>
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<td class="new_line diff-line-num new" data-linenumber="123" style="width: 35px; color: rgba(5,5,6,.24); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: inherit;" align="right" bgcolor="#ddfbe6">
123
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<td class="line_content new" style="padding: inherit;" bgcolor="#ecfdf0"><pre style='display: block; font-size: 14px; color: #28272d; position: relative; font-family: "GitLab Mono","JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;'>+<span id="LC123" class="line" lang="c"> <span class="n" style="color: #333333;">request</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333333;">suspendcbp</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333333;">suspendcbp</span><span class="p">;</span></span>
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<td class="new_line diff-line-num new" data-linenumber="124" style="width: 35px; color: rgba(5,5,6,.24); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: inherit;" align="right" bgcolor="#ddfbe6">
124
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<td class="line_content new" style="padding: inherit;" bgcolor="#ecfdf0"><pre style='display: block; font-size: 14px; color: #28272d; position: relative; font-family: "GitLab Mono","JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;'>+<span id="LC124" class="line" lang="c"> <span class="p">}</span></span>
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<td class="new_line diff-line-num new" data-linenumber="125" style="width: 35px; color: rgba(5,5,6,.24); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: inherit;" align="right" bgcolor="#ddfbe6">
125
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<td class="line_content new" style="padding: inherit;" bgcolor="#ecfdf0"><pre style='display: block; font-size: 14px; color: #28272d; position: relative; font-family: "GitLab Mono","JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;'>+<span id="LC125" class="line" lang="c"> <span class="n" style="color: #333333;">suspendcbp</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333333;">requests_left</span><span class="o" style="font-weight: 600;">++</span><span class="p">;</span></span>
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<p dir="auto" style="color: #28272d; margin: 0 0 16px;" align="initial">Yes, this is an error. That part of the code handles the case where a request is involved in more than one suspend call. I have changed it and now i think it works, although maybe there are better solutions.
Now the code is as follows:</p>
<div class="gl-relative markdown-code-block js-markdown-code">
<pre class="code highlight js-syntax-highlight language-plaintext" v-pre="true" style="display: block; font-size: 90%; color: #28272d; line-height: 1.6em; overflow-x: auto; border-radius: .25rem; position: relative; font-family: monospace; word-break: break-all; word-wrap: break-word; background-color: #ffffff; -premailer-cellpadding: 0; -premailer-cellspacing: 0; -premailer-width: 100%; margin: 0 0 16px; padding: 12px; border: 1px solid #dcdcde;"><code style='font-size: inherit; color: inherit; word-wrap: normal; word-break: keep-all; background-color: inherit; border-radius: .25rem; white-space: pre; margin-top: 0; font-family: "GitLab Mono","JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; vertical-align: bottom; overflow-wrap: normal; padding: unset;'><span id="LC1" class="line" lang="plaintext" style="margin-top: 0;">if ( request->suspendcbp == NULL ) {</span>
<span id="LC2" class="line" lang="plaintext"> request->suspendcbp = suspendcbp;</span>
<span id="LC3" class="line" lang="plaintext"> suspendcbp->requests_left++;</span>
<span id="LC4" class="line" lang="plaintext"></span>
<span id="LC5" class="line" lang="plaintext">} else {</span>
<span id="LC6" class="line" lang="plaintext"> pthread_mutex_lock( request->suspendcbp->mutex );</span>
<span id="LC7" class="line" lang="plaintext"> if ( request->suspendcbp->notified == AIO_SIGNALED ) {</span>
<span id="LC8" class="line" lang="plaintext"> pthread_mutex_unlock( request->suspendcbp->mutex );</span>
<span id="LC9" class="line" lang="plaintext"></span>
<span id="LC10" class="line" lang="plaintext"> rtems_aio_update_suspendcbp( request->suspendcbp );</span>
<span id="LC11" class="line" lang="plaintext"> request->suspendcbp = suspendcbp;</span>
<span id="LC12" class="line" lang="plaintext"> suspendcbp->requests_left++;</span>
<span id="LC13" class="line" lang="plaintext"></span>
<span id="LC14" class="line" lang="plaintext"> } else{</span>
<span id="LC15" class="line" lang="plaintext"> thread_mutex_unlock( request->suspendcbp->mutex );</span>
<span id="LC16" class="line" lang="plaintext"> }</span>
<span id="LC17" class="line" lang="plaintext">}</span></code></pre>
<copy-code></copy-code><insert-code-snippet></insert-code-snippet>
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<p dir="auto" style="color: #28272d; margin: 0 0 16px;" align="initial">If <code style='font-size: 90%; color: #18171d; word-wrap: break-word; background-color: #ececef; border-radius: .25rem; margin-top: 0; font-weight: inherit; font-family: "GitLab Mono","JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; vertical-align: bottom; white-space: pre-wrap; overflow-wrap: break-word; word-break: keep-all; padding: 2px 4px;'>request->suspendcbp == NULL</code>, I can simply set <code style='font-size: 90%; color: #18171d; word-wrap: break-word; background-color: #ececef; border-radius: .25rem; font-weight: inherit; font-family: "GitLab Mono","JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; vertical-align: bottom; white-space: pre-wrap; overflow-wrap: break-word; word-break: keep-all; padding: 2px 4px;'>request->suspendcbp</code> to the new suspendcb.
If <code style='font-size: 90%; color: #18171d; word-wrap: break-word; background-color: #ececef; border-radius: .25rem; font-weight: inherit; font-family: "GitLab Mono","JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; vertical-align: bottom; white-space: pre-wrap; overflow-wrap: break-word; word-break: keep-all; padding: 2px 4px;'>request->suspendcbp != NULL</code>, it means that the request has been involved in another suspend request. There are now two cases:</p>
<ol dir="auto" style="text-align: initial; margin: 0; padding: 0;">
<li style="margin-top: 0; line-height: 1.6em; margin-left: 25px; padding-left: 3px;">If the other suspendcb has yet to generate the signal, I don't need to do anything since the completion of the request will generate the signal.</li>
<li style="line-height: 1.6em; margin-left: 25px; padding-left: 3px;">However, if the suspendcbp has already generated a signal, I update it and then set <code style='font-size: 90%; color: #18171d; word-wrap: break-word; background-color: #ececef; border-radius: .25rem; margin-top: 0; font-family: "GitLab Mono","JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; vertical-align: bottom; white-space: pre-wrap; overflow-wrap: break-word; word-break: keep-all; padding: 2px 4px;'>request->suspendcbp</code> to the new suspendcb.</li>
</ol>
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