[boost] darwin missing clock_gettime (causing problems in shmem)

From: Ian Fasel (ianfasel_at_[hidden])
Date: 2006-04-11 19:22:33

I was trying to use the shmem library on darwin and ran into errors  
because darwin does not have a clock_gettime function.

I believe there needs to be something like a BOOST_HAS_CLOCK_GETTIME  
in config.hpp -- either there, or in shmem.  Then the following patch  
for shmem would probably be appropriate:

--- shmemlib-0-orig/boost/shmem/sync/xtime.hpp  2005-12-30  
19:32:02.000000000 +0000
+++ shmemlib-0/boost/shmem/sync/xtime.hpp       2006-04-11  
22:24:09.000000000 +0000
@@ -102,12 +102,19 @@
        #else
-
+
+        #if defined BOOST_HAS_CLOCK_GETTIME
          timespec ts;
          clock_gettime(CLOCK_REALTIME, &ts);
          xtp->sec = ts.tv_sec;
          xtp->nsec = ts.tv_nsec;
-        return clock_type;
+        #else
+        struct timeval tv;
+        if (gettimeofday (&tv, 0) == 0) {
+          xtp->sec = tv.tv_sec;
+          xtp->nsec = tv.tv_usec*1000;
+        }
+        #endif
        #endif
          return clock_type;

With this patch, I am able to get the examples in shmem to build.   
Unfortunately, it then fails in
        boost::shmem::detail::mutexattr_wrapper::mutexattr_wrapper
because pthread_mutexattr_init  fails.

I can go into more info about the problems with shmem on darwin if  
this is useful to anyone.  I realize this may be the wrong list for  
this post since shmem is still in 0.9 development, so please point me  
in the right direction if so.

-Ian Fasel