[libmicrohttpd] Problems compiling in OSX with CLOCK_MONOTONIC.

[James Aspinwall]

I am having problems compiling in OSX because CLOCK_MONOTONIC is missing. I get the following error:

gcc -DHAVE_CONFIG_H -I. -I../..  -I../../src/include/plibc -I../.. -I../../src/include -I../../src/applicationlayer   -DDATA_DIR=\"../../src/datadir/\"  -no-cpp-precomp -fno-common -fno-strict-aliasing -g -O2 -MT proxy.o -MD -MP -MF .deps/proxy.Tpo -c -o proxy.o proxy.c

proxy.c: In function ‘parse_uri’:

proxy.c:247: warning: field precision should have type ‘int’, but argument 3 has type ‘regoff_t’

proxy.c:248: warning: field precision should have type ‘int’, but argument 3 has type ‘regoff_t’

proxy.c:249: warning: field precision should have type ‘int’, but argument 3 has type ‘regoff_t’

proxy.c:250: warning: field precision should have type ‘int’, but argument 3 has type ‘regoff_t’

proxy.c:251: warning: field precision should have type ‘int’, but argument 3 has type ‘regoff_t’

proxy.c:252: warning: field precision should have type ‘int’, but argument 3 has type ‘regoff_t’

proxy.c: In function ‘run’:

proxy.c:1165: error: ‘CLOCK_MONOTONIC’ undeclared (first use in this function)

proxy.c:1165: error: (Each undeclared identifier is reported only once

proxy.c:1165: error: for each function it appears in.)

make[4]: *** [proxy.o] Error 1

make[3]: *** [all-recursive] Error 1

make[2]: *** [all-recursive] Error 1

make[1]: *** [all-recursive] Error 1

make: *** [all] Error 2

I googled the problem and I saw the following comment:

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CLOCK_MONOTONIC is not available on OS X. Also, isn't CLOCK_MONOTONIC_RAW fetching the counter from rdtsc instruction on x86? (And therefore can go backwards in time if your process is migrated to another CPU).

Keep in mind, also, that the CLOCK_MONOTONIC is not part of the core POSIX standard, so OS X is technically "compliant" even though they didn't implement it. Add this to a list of annoyances, such as no pthread_cond_timed_wait().

You can, however, get a monotonic clock by getting access to the clock service on mach.

By audidude 23 days ago

No CLOCK_MONOTONIC in OS X?

In a David Tennant voice: Wait, what?? What?!

  ~$ grep CLOCK_MONOTONIC /usr/include -rn

  ~$

Ahh, it's in the POSIX realtime extension... Dammit.

Apparently [1] one solution would be to #IFDEF DARWIN the following, as on Darwin SYSTEM_CLOCK is supposed to be a monotonic boot clock.

  #include <mach/clock.h>

  #include <mach/mach.h>

  

     ...

  

  clock_serv_t cclock;

  mach_timespec_t mts;

  host_get_clock_service(mach_host_self(), SYSTEM_CLOCK,

  &cclock);

  clock_get_time(cclock, &mts);

  mach_port_deallocate(mach_task_self(), cclock); 

Not sure if processor affinity would affect that code (don't have time right now to do the in depth reading on it), but you could always set affinity to CPU0. Though then you'd have to make sure to run the sudo'd command as a child process and appropriately reset affinity to default before a call to exec...

By benjamincburns 23 days ago

On OS X, use mach_absolute_time() to get a monotonic clock. A lot of APIs in OS X use the monotonic clock, e.g. CoreAnimation wraps mach_absolute_time() as CACurrentMediaTime() and uses that to calculate animation start times and delays.

By simscitizen 23 days ago

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Configure output is:

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configure: creating ./config.status

config.status: creating libmicrohttpd.pc

config.status: creating Makefile

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config.status: creating src/microhttpd/Makefile

config.status: creating src/microspdy/Makefile

config.status: creating src/spdy2http/Makefile

config.status: creating src/examples/Makefile

config.status: creating src/testcurl/Makefile

config.status: creating src/testcurl/https/Makefile

config.status: creating src/testspdy/Makefile

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config.status: creating MHD_config.h

config.status: executing depfiles commands

config.status: executing libtool commands

configure: Configuration Summary:

  Operating System:  darwin12.5.0

  libgcrypt:         no, HTTPS will not be built

  libcurl (testing): yes

  Target directory:  /usr/local

  Messages:          yes

  Basic auth.:       yes

  Digest auth.:      yes

  Postproc:          yes

  HTTPS support:     no (lacking libgcrypt or libgnutls)

  epoll support:

  libmicrospdy:      yes

  spdylay (testing): no

configure:

  License         :  LGPL or eCos

Thanks for any help.

James