<html xmlns="http://www.w3.org/1999/xhtml"> <head> <title></title> </head> <body> <div name="messageBodySection"><font face="Palatino, serif">So hypothetically it should be fine with the hlc.gc grade to use a simple ’stub’ for `signal` or `sigaction` to placate the linker. Unfortunately the Boehm GC test function `GC_is_visible`, used during the mercury run time init process, is not succeeding. Is it safe to assume that this problem has nothing to do with signals then?</font></div> <div name="messageSignatureSection"><br /> <font face="Palatino, serif">Thanks,</font> <div dir="auto"><font face="Palatino, serif">Patrick</font></div> </div> <div name="messageReplySection">On Mar 30, 2020, 4:53 PM -0700, Peter Wang <novalazy@gmail.com>, wrote:<br /> <blockquote type="cite" class="spark_quote" style="margin: 5px 5px; padding-left: 10px; border-left: thin solid #1abc9c;">On Mon, 30 Mar 2020 00:42:09 -0700, Patrick Henning <path@fea.st> wrote:<br /> <blockquote type="cite" class="spark_quote" style="margin: 5px 5px; padding-left: 10px; border-left: thin solid #e67e22;">Does Mercury need `signal` in the absence of `sigaction`? If so, the porting may not be possible currently since neither of these are implemented for emscripten unfortunately.<br /></blockquote> <br /> The runtime will use signal if sigaction is not available;<br /> see MR_set_signal_action.<br /> <br /> The runtime does set up signal handlers for SIGSEGV/SIGBUS to display an<br /> error message in case of a crash, but is not really required.<br /> <br /> Time profiling grades (.prof) need to set a signal handler for a timer<br /> signal (see MR_init_time_profile_method), so you could not use those<br /> grades.<br /> <br /> Parallel grades (.par) will need to set signal handlers which are used<br /> in the stop-the-world implementation for GC, so you could not those<br /> grades.<br /> <br /> Debugging grades set a couple of signal handlers.<br /> <br /> Peter<br /></blockquote> </div> </body> </html>