thread-utils: build with NO_PTHREADS fails

[Victor Leschuk <vleschuk@xxxxxxxxxxxxxxxx>]

Hello all,

I think that no one tried it for a long time but I needed a single-threaded git version for debug purpose. I tried to build with -DNO_PTHREADS and thread-utils.c failed to compile.

In brief the situation is the following:

in header file we have something like that:


#ifndef NO_PTHREAD
extern int online_cpus(void);

#else
#define online_cpus() 1
#endif // NO_PTHREAD

and in *.c file:


int online_cpus(void)
{
    // ...
}

So the compilation fails with: 

test.c:3:21: error: macro "online_cpus" passed 1 arguments, but takes just 0
 int online_cpus(void)

That's a tiny issue, but maybe we could apply a straight-forward solution (see attached diff)? If you agree I'll prepare a properly-formatted [PATCH] submit.


--
Best Regards,
Victor

diff --git a/thread-utils.c b/thread-utils.c
index a2135e0..f3e90fb 100644
--- a/thread-utils.c
+++ b/thread-utils.c
@@ -20,6 +20,7 @@
 
 int online_cpus(void)
 {
+#ifndef NO_PTHREADS
 #ifdef _SC_NPROCESSORS_ONLN
 	long ncpus;
 #endif
@@ -58,11 +59,13 @@ int online_cpus(void)
 		return (int)ncpus;
 #endif
 
+#endif
 	return 1;
 }
 
 int init_recursive_mutex(pthread_mutex_t *m)
 {
+#ifndef NO_PTHREADS
 	pthread_mutexattr_t a;
 	int ret;
 
@@ -74,4 +77,7 @@ int init_recursive_mutex(pthread_mutex_t *m)
 		pthread_mutexattr_destroy(&a);
 	}
 	return ret;
+#else
+	return 0;
+#endif
 }
diff --git a/thread-utils.h b/thread-utils.h
index d9a769d..6fb98c3 100644
--- a/thread-utils.h
+++ b/thread-utils.h
@@ -7,9 +7,5 @@
 extern int online_cpus(void);
 extern int init_recursive_mutex(pthread_mutex_t*);
 
-#else
-
-#define online_cpus() 1
-
 #endif
 #endif /* THREAD_COMPAT_H */