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velzieandClaude Opus 4.8
a11460955e
Running the test in the browser exposed a flake I had committed: priority.c printed getcpu's node, but under QEMU that is the real host NUMA node of whichever core the process happened to land on -- 0 on one run, 1 on the next. gex reports a single scheduling domain (node 0), so the test would pass or fail by luck of scheduling. Check only that getcpu succeeds, as the cpu number already is. Now identical across gexc, QEMU and the browser. Co-Authored-By: Claude Opus 4.8 <[email protected]> Claude-Session: https://claude.ai/code/session_019b4VWMhJUWoGKQh4EeFfPm
31 lines
1.1 KiB
C
31 lines
1.1 KiB
C
/* getpriority/setpriority/getcpu: we run at the default niceness in a single
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* scheduling domain. getpriority and setpriority are deterministic and so are
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* checked against QEMU directly; getcpu's CPU number is whatever host core the
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* process lands on (QEMU reports the real one), so only its success is checked. */
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#define _GNU_SOURCE
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#include <errno.h>
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#include <sched.h>
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#include <stdio.h>
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#include <sys/resource.h>
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#include <sys/syscall.h>
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#include <unistd.h>
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int main(void) {
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errno = 0;
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int p = getpriority(PRIO_PROCESS, 0);
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printf("getpriority=%d errno=%d\n", p, errno);
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int r = setpriority(PRIO_PROCESS, 0, 5);
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printf("setpriority ret=%d\n", r);
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unsigned cpu = 99, node = 99;
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long g = syscall(SYS_getcpu, &cpu, &node, 0);
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/* Only success is checked: the CPU and NUMA node are whatever host core the
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* process lands on under QEMU (nondeterministic), so neither is a portable
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* oracle -- gex reports a single scheduling domain (cpu 0, node 0). */
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printf("getcpu ok=%d\n", g == 0);
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printf("priority ok\n");
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return 0;
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}
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