[PATCH v3 1/2] cyclictest: Move main pid setaffinity handling into a function

[Jonathan Schwender <schwenderjonathan@gmail.com>]

Move error handling for setting the affinity of the main pid
into a separate function.
This prevents duplicating the code in the next commit,
where the main thread pid can be restricted to one of
two bitmasks depending on the passed parameters.

After feedback from John Kacur, the function is now
located in src/lib/rt-numa.c.
This allows other tests to reuse this, if they also
prefer to warn if numa_sched_setaffinity fails.

Signed-off-by: Jonathan Schwender <schwenderjonathan@gmail.com>
---
 src/cyclictest/cyclictest.c |  8 +-------
 src/include/rt-numa.h       |  2 ++
 src/lib/rt-numa.c           | 11 +++++++++++
 3 files changed, 14 insertions(+), 7 deletions(-)

diff --git a/src/cyclictest/cyclictest.c b/src/cyclictest/cyclictest.c
index dca9610..460f6ae 100644
--- a/src/cyclictest/cyclictest.c
+++ b/src/cyclictest/cyclictest.c
@@ -1791,13 +1791,7 @@ int main(int argc, char **argv)
 
 	/* Restrict the main pid to the affinity specified by the user */
 	if (affinity_mask != NULL) {
-		int res;
-
-		errno = 0;
-		res = numa_sched_setaffinity(getpid(), affinity_mask);
-		if (res != 0)
-			warn("Couldn't setaffinity in main thread: %s\n", strerror(errno));
-
+		try_numa_sched_setaffinity(getpid(), affinity_mask);
 		if (verbose)
 			printf("Using %u cpus.\n",
 				numa_bitmask_weight(affinity_mask));
diff --git a/src/include/rt-numa.h b/src/include/rt-numa.h
index ca86a45..e9fa312 100644
--- a/src/include/rt-numa.h
+++ b/src/include/rt-numa.h
@@ -18,4 +18,6 @@ int cpu_for_thread_ua(int thread_num, int max_cpus);
 
 int parse_cpumask(char *str, int max_cpus, struct bitmask **cpumask);
 
+void try_numa_sched_setaffinity(__pid_t pid, struct bitmask *cpumask);
+
 #endif
diff --git a/src/lib/rt-numa.c b/src/lib/rt-numa.c
index babcc63..9a81cfb 100644
--- a/src/lib/rt-numa.c
+++ b/src/lib/rt-numa.c
@@ -138,3 +138,14 @@ int parse_cpumask(char *str, int max_cpus, struct bitmask **cpumask)
 
 	return 0;
 }
+
+void try_numa_sched_setaffinity(pid_t pid, struct bitmask *cpumask)
+{
+	int res;
+
+	errno = 0;
+	res = numa_sched_setaffinity(pid, cpumask);
+	if (res != 0)
+		warn("Couldn't setaffinity for thread %d: %s\n", pid,
+		     strerror(errno));
+}
-- 
2.30.2