Re: Posix Timers?
Re: Posix Timers?
- Subject: Re: Posix Timers?
- From: Terry Lambert <email@hidden>
- Date: Mon, 7 Jan 2008 15:07:50 -0800
On Jan 5, 2008, at 10:06 AM, Steve Checkoway wrote:
On Jan 5, 2008, at 8:53 AM, Andre-John Mas wrote:
Could someone tell me whether MacOS X supports POSIX timers?
If you mean the api specified in <http://www.jaluna.com/doc/c5/html/Overview/x5408.html
> (just the first hit on google), then the answer would seem to be no:
$ find /usr/include -name '*.h'|xargs egrep 'clock_(settime|gettime|
getres)|timer_(create|delete|settime|gettime|getoverrun)|nanosleep'
/usr/include/php/ext/standard/
basic_functions.h:PHP_FUNCTION(time_nanosleep);
/usr/include/php/main/php_config.h:/* Define if you have the
nanosleep function. */
/usr/include/time.h:int nanosleep(const struct timespec *, struct
timespec *) __DARWIN_ALIAS_C(nanosleep);
Only nanosleep seems to be there.
Specifically, all POSIX functionality should be feature tested using
<unistd.h> macros before you assume it's there; for POSIX Timers:
% grep TIMER /usr/include/unistd.h
#define _POSIX_TIMERS (-1) /* [TMR] */
So no.
The proper way to feature test POSIX interfaces is:
#include <unistd.h>
...
#if defined(_POSIX_TIMERS) && (_POSIX_TIMERS - 200112L) >= 0L
/* This POSIX feature is supported */
...
#else
/* This POSIX feature is not supported; use an alternate
implementation */
...
#endif
-- Terry
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