Messages in this thread |  | | Date | Tue, 21 Aug 2018 13:04:17 +0530 | From | "Naveen N. Rao" <> | Subject | Re: [PATCH v9 0/4] Uprobes: Support SDT markers having reference count (semaphore) |
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Song Liu wrote: > I am testing the patch set with the following code: > > #include <stdio.h> > #include <unistd.h> > > volatile short semaphore = 0; > > int for_uprobe(int c) > { > printf("%d\n", c + 10); > return c + 1; > } > > int main(int argc, char *argv[]) > { > for_uprobe(argc); > while (1) { > sleep(1); > printf("semaphore %d\n", semaphore); > } > } > > I created a uprobe on function for_uprobe(), that uses semaphore as > reference counter: > > echo "p:uprobe_1 /root/a.out:0x49a(0x1036)" >> uprobe_events
Is that even valid? That _looks_ like a semaphore, but I'm not quite sure that it qualifies as an _SDT_ semaphore. Do you see this issue if you instead use the macros provided by <sys/sdt.h> to create SDT markers?
- Naveen
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