On 6/22/2015 9:25 AM, Corinna Vinschen wrote:
On Jun 22 08:05, Ken Brown wrote:
According to the Cygwin API documentation
(https://cygwin.com/cygwin-api/std-notes.html), "getitimer and setitimer
only support ITIMER_REAL for now." I'm wondering whether there's any chance
that support for ITIMER_PROF might be added. I have no idea what the
obstacles are.
My reason for asking is that emacs has a CPU profiling function, which
doesn't work on Cygwin because it relies on ITIMER_PROF. (There's an
alternative implementation, but it requires timer_getoverrun, also not
available in Cygwin.)
Both very tricky. Given the description of timer_getoverrun and how
this stuff is implemented in Cygwin, you might get away with
#ifdef __CYGWIN__
#define timer_getoverrun(x) 0
#endif
indepedently of using SIGEV_SIGNAL or SIGEV_THREAD.
This seems to work. Thanks!
One question: It seems that SIGEV_SIGNAL and friends are defined as macros on
Linux (or at least on the one Linux distribution I looked at), but on Cygwin
they're only enum constants. And emacs expects them to be defined as macros.
Would something like the following be reasonable for the sake of compatibility?
--- a/winsup/cygwin/include/cygwin/signal.h
+++ b/winsup/cygwin/include/cygwin/signal.h
@@ -311,6 +311,10 @@ enum
perform notification */
};
+#define SIGEV_SIGNAL SIGEV_SIGNAL
+#define SIGEV_NONE SIGEV_NONE
+#define SIGEV_THREAD SIGEV_THREAD
+
#if __WORDSIZE == 64
typedef __uint64_t sigset_t;
#else
Ken
Ken
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