[libstdc++-v3 PATCH/RFA] Protect use of optional POSIX features

[Jason R Thorpe]

In a similar vein to my recent patch to gcc/gthr-posix.h, this protects
use of features from the optional Thread Priority Scheduling group in
the "pthread5" test.

Since this question came up wrt. gthr-posix.h, does the inclusion of
<unistd.h> need to be protected?  POSIX systems must provide this header
for feature testing, and since pthreads is a POSIX feature, seems reasonable
to assume that the header is there.

OK for mainline?

	* testsuite/thread/pthread5.cc: Include <unistd.h>.
	(main): Only use pthread_attr_setscope if
	_POSIX_THREAD_PRIORITY_SCHEDULING is defined.

-- 
        -- Jason R. Thorpe <thorpej@wasabisystems.com>
-------------- next part --------------
Index: pthread5.cc
===================================================================
RCS file: /cvs/gcc/gcc/libstdc++-v3/testsuite/thread/pthread5.cc,v
retrieving revision 1.2
diff -c -r1.2 pthread5.cc
*** pthread5.cc	25 Jan 2002 16:05:48 -0000	1.2
--- pthread5.cc	28 Oct 2002 05:45:10 -0000
***************
*** 32,37 ****
--- 32,39 ----
  // configured for the port, then it is picked up free from STL headers.
  
  #if __GTHREADS
+ #include <unistd.h>	// To test for _POSIX_THREAD_PRIORITY_SCHEDULING
+ 
  using namespace std;
  
  #define NTHREADS 8
***************
*** 97,103 ****
--- 99,107 ----
  
    pthread_attr_t tattr;
    int ret = pthread_attr_init (&tattr);
+ #ifdef _POSIX_THREAD_PRIORITY_SCHEDULING
    ret = pthread_attr_setscope(&tattr, PTHREAD_SCOPE_SYSTEM);
+ #endif
  
    for (worker = 0; worker < NTHREADS; worker++)
      {