MINOR: thread: implement the detection of forced cpu affinity
Create a function thread_cpu_mask_forced. Its purpose is to report if a
restrictive cpu mask is active for the current proces, for example due
to a taskset invocation. It is only implemented for the linux platform
currently.
diff --git a/src/thread.c b/src/thread.c
index 07017dd..fd9e6b6 100644
--- a/src/thread.c
+++ b/src/thread.c
@@ -193,6 +193,19 @@
return ret;
}
+/* Returns 1 if the cpu set is currently restricted for the process else 0.
+ * Currently only implemented for the Linux platform.
+ */
+int thread_cpu_mask_forced()
+{
+#if defined(__linux__)
+ const int cpus_avail = sysconf(_SC_NPROCESSORS_ONLN);
+ return cpus_avail != thread_cpus_enabled();
+#else
+ return 0;
+#endif
+}
+
/* Depending on the platform and how libpthread was built, pthread_exit() may
* involve some code in libgcc_s that would be loaded on exit for the first
* time, causing aborts if the process is chrooted. It's harmless bit very