Recent versions of freebsd have a threadsafe poll.

Use sched_get_priority_* to get actual priority min & max rather than hardcoding defaults.
Patches from freebsd ports system.
Bug #112987 r=rjesup@wgate.com

nsprpub/pr/include/md/_freebsd.h

@@ -37,6 +37,7 @@
 
 #include "prthread.h"
 
+#include <sys/param.h>
 #include <sys/syscall.h>
 
 #define PR_LINKER_ARCH	"freebsd"
@@ -65,7 +66,7 @@
 #define _PR_HAVE_SOCKADDR_LEN
 #define _PR_STAT_HAS_ST_ATIMESPEC
 #define _PR_NO_LARGE_FILES
-#if ( __FreeBSD__ > 2 )
+#if ( __FreeBSD_version >= 220000 ) && ( __FreeBSD_version < 400008 )
 #if !defined(_PR_PTHREADS)
 /*
  * libc_r doesn't have poll().  Although libc has poll(), it is not

nsprpub/pr/include/md/_pth.h

@@ -225,7 +225,7 @@
 #define PT_PRIO_MAX            sched_get_priority_max(SCHED_OTHER)
 #endif /* defined(_PR_DCETHREADS) */
 
-#elif defined(LINUX)
+#elif defined(LINUX) || defined(FREEBSD)
 #define PT_PRIO_MIN            sched_get_priority_min(SCHED_OTHER)
 #define PT_PRIO_MAX            sched_get_priority_max(SCHED_OTHER)
 #elif defined(NTO)
@@ -245,7 +245,7 @@
  */
 #define PT_PRIO_MIN            1
 #define PT_PRIO_MAX            127
-#elif defined(FREEBSD) || defined(NETBSD) || defined(OPENBSD) \
+#elif defined(NETBSD) || defined(OPENBSD) \
 	|| defined(BSDI) || defined(DARWIN) || defined(UNIXWARE) /* XXX */
 #define PT_PRIO_MIN            0
 #define PT_PRIO_MAX            126