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Thanks for sharing that. It is a nice solution to my problem. I wouldn't have thought about having a ThreadFactory with a Semaphore for a ThreadFactory. But it looks simple and solves the problem.<br>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> loom-dev <loom-dev-retn@openjdk.org> on behalf of Daniel Avery <danielaveryj@gmail.com><br>
<b>Sent:</b> May 13, 2024 6:56 PM<br>
<b>To:</b> loom-dev <loom-dev@openjdk.java.net><br>
<b>Subject:</b> Re: Resource Constrained Thread Per Task Executor</font>
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<div dir="ltr">If you did need to integrate a semaphore into an ExecutorService, you might find it easier to implement a ThreadFactory, and then leverage the utility methods in Executors to get an ExecutorService.
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<div><font face="monospace">```</font></div>
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<p class="x_gmail-p1" style="margin:0px; font-variant-numeric:normal; font-variant-east-asian:normal; font-variant-alternates:normal; font-kerning:auto; font-feature-settings:normal; font-stretch:normal; font-size:13px; line-height:normal">
<font face="monospace">Semaphore sem = new Semaphore(permits);</font></p>
<p class="x_gmail-p1" style="margin:0px; font-variant-numeric:normal; font-variant-east-asian:normal; font-variant-alternates:normal; font-kerning:auto; font-feature-settings:normal; font-stretch:normal; font-size:13px; line-height:normal">
<font face="monospace">ThreadFactory factory1 = Thread.ofVirtual().factory();</font></p>
<p class="x_gmail-p1" style="margin:0px; font-variant-numeric:normal; font-variant-east-asian:normal; font-variant-alternates:normal; font-kerning:auto; font-feature-settings:normal; font-stretch:normal; font-size:13px; line-height:normal">
<font face="monospace">ThreadFactory factory2 = runnable -> {</font></p>
<p class="x_gmail-p1" style="margin:0px; font-variant-numeric:normal; font-variant-east-asian:normal; font-variant-alternates:normal; font-kerning:auto; font-feature-settings:normal; font-stretch:normal; font-size:13px; line-height:normal">
<font face="monospace"> try {</font></p>
<p class="x_gmail-p1" style="margin:0px; font-variant-numeric:normal; font-variant-east-asian:normal; font-variant-alternates:normal; font-kerning:auto; font-feature-settings:normal; font-stretch:normal; font-size:13px; line-height:normal">
<font face="monospace"> sem.acquire();</font></p>
<p class="x_gmail-p1" style="margin:0px; font-variant-numeric:normal; font-variant-east-asian:normal; font-variant-alternates:normal; font-kerning:auto; font-feature-settings:normal; font-stretch:normal; font-size:13px; line-height:normal">
<font face="monospace"> return factory1.newThread(() -> {</font></p>
<p class="x_gmail-p1" style="margin:0px; font-variant-numeric:normal; font-variant-east-asian:normal; font-variant-alternates:normal; font-kerning:auto; font-feature-settings:normal; font-stretch:normal; font-size:13px; line-height:normal">
<font face="monospace"> try {</font></p>
<p class="x_gmail-p1" style="margin:0px; font-variant-numeric:normal; font-variant-east-asian:normal; font-variant-alternates:normal; font-kerning:auto; font-feature-settings:normal; font-stretch:normal; font-size:13px; line-height:normal">
<font face="monospace"> runnable.run();</font></p>
<p class="x_gmail-p1" style="margin:0px; font-variant-numeric:normal; font-variant-east-asian:normal; font-variant-alternates:normal; font-kerning:auto; font-feature-settings:normal; font-stretch:normal; font-size:13px; line-height:normal">
<font face="monospace"> } finally {</font></p>
<p class="x_gmail-p1" style="margin:0px; font-variant-numeric:normal; font-variant-east-asian:normal; font-variant-alternates:normal; font-kerning:auto; font-feature-settings:normal; font-stretch:normal; font-size:13px; line-height:normal">
<font face="monospace"> sem.release();</font></p>
<p class="x_gmail-p1" style="margin:0px; font-variant-numeric:normal; font-variant-east-asian:normal; font-variant-alternates:normal; font-kerning:auto; font-feature-settings:normal; font-stretch:normal; font-size:13px; line-height:normal">
<font face="monospace"> }</font></p>
<p class="x_gmail-p1" style="margin:0px; font-variant-numeric:normal; font-variant-east-asian:normal; font-variant-alternates:normal; font-kerning:auto; font-feature-settings:normal; font-stretch:normal; font-size:13px; line-height:normal">
<font face="monospace"> });</font></p>
<p class="x_gmail-p1" style="margin:0px; font-variant-numeric:normal; font-variant-east-asian:normal; font-variant-alternates:normal; font-kerning:auto; font-feature-settings:normal; font-stretch:normal; font-size:13px; line-height:normal">
<font face="monospace"> } catch (InterruptedException ie) { // interrupted in acquire()</font></p>
<p class="x_gmail-p1" style="margin:0px; font-variant-numeric:normal; font-variant-east-asian:normal; font-variant-alternates:normal; font-kerning:auto; font-feature-settings:normal; font-stretch:normal; font-size:13px; line-height:normal">
<font face="monospace"> Thread.currentThread().interrupt();</font></p>
<p class="x_gmail-p1" style="margin:0px; font-variant-numeric:normal; font-variant-east-asian:normal; font-variant-alternates:normal; font-kerning:auto; font-feature-settings:normal; font-stretch:normal; font-size:13px; line-height:normal">
<font face="monospace"> throw new RuntimeException(ie);</font></p>
<p class="x_gmail-p1" style="margin:0px; font-variant-numeric:normal; font-variant-east-asian:normal; font-variant-alternates:normal; font-kerning:auto; font-feature-settings:normal; font-stretch:normal; font-size:13px; line-height:normal">
<font face="monospace"> } catch (Throwable t) { // threw in newThread()</font></p>
<p class="x_gmail-p1" style="margin:0px; font-variant-numeric:normal; font-variant-east-asian:normal; font-variant-alternates:normal; font-kerning:auto; font-feature-settings:normal; font-stretch:normal; font-size:13px; line-height:normal">
<font face="monospace"> sem.release();</font></p>
<p class="x_gmail-p1" style="margin:0px; font-variant-numeric:normal; font-variant-east-asian:normal; font-variant-alternates:normal; font-kerning:auto; font-feature-settings:normal; font-stretch:normal; font-size:13px; line-height:normal">
<font face="monospace"> throw t;</font></p>
<p class="x_gmail-p1" style="margin:0px; font-variant-numeric:normal; font-variant-east-asian:normal; font-variant-alternates:normal; font-kerning:auto; font-feature-settings:normal; font-stretch:normal; font-size:13px; line-height:normal">
<font face="monospace"> }</font></p>
<p class="x_gmail-p1" style="margin:0px; font-variant-numeric:normal; font-variant-east-asian:normal; font-variant-alternates:normal; font-kerning:auto; font-feature-settings:normal; font-stretch:normal; font-size:13px; line-height:normal">
<font face="monospace">};</font></p>
<p class="x_gmail-p1" style="margin:0px; font-variant-numeric:normal; font-variant-east-asian:normal; font-variant-alternates:normal; font-kerning:auto; font-feature-settings:normal; font-stretch:normal; font-size:13px; line-height:normal">
<font face="monospace">ExecutorService es = Executors.newThreadPerTaskExecutor(factory2);</font></p>
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<div><font face="monospace">```</font></div>
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<div>- Daniel</div>
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