pthread_getaffinity_np issue

[Jason Schulz]

I'm having an issue using the non-posix thread affinity methods.  Specifically, I'm having trouble using CPU_COUNT.  I'm trying to use the following code to get the current number of processors in a processes affinity...



long cs = 0;

#if defined(HAVE_LINUX) || defined(HAVE_FREEBSD)

pthread_t this = pthread_self();

cpu_set_t cpus;

CPU_ZERO(&cpus);

int err = pthread_getaffinity_np(this, sizeof(cpus), &cpus);

if (err)
  return err;

cs = (long) CPU_COUNT(&cpus);



However, I get the compiler error...



clang -DHAVE_CONFIG_H -I.      -g -O2 -D_THREAD_SAFE -pthread -pipe -std=c99 -D_XOPEN_SOURCE=700 -pedantic -Wall -Wextra -Wsign-conversion -Wconversion -Werror -MT thread.o -MD -MP -MF .deps/thread.Tpo -c -o thread.o thread.c
thread.c:85:15: error: implicit declaration of function '__bitcountl' is invalid in C99 [-Werror,-Wimplicit-function-declaration]
  cs = (long) CPU_COUNT(&cpus);
              ^
/usr/include/sys/cpuset.h:63:24: note: expanded from macro 'CPU_COUNT'
#define CPU_COUNT(p)                    BIT_COUNT(CPU_SETSIZE, p)
                                        ^
/usr/include/sys/bitset.h:185:14: note: expanded from macro 'BIT_COUNT'
                __count += __bitcountl((p)->__bits[__i]);               \
                           ^
1 error generated.



I'm able to use CPU_ISSET to the same effect, but obviously I'd rather use CPU_COUNT.  Suggestions?


-Jason