benchmark silo added

[c11concurrency-benchmarks.git] / silo / core.cc

diff --git a/silo/core.cc b/silo/core.cc
new file mode 100644 (file)
index 0000000..8f91fde
--- /dev/null
+++ b/silo/core.cc
@@ -0,0 +1,35 @@
+#include <unistd.h>
+
+#include "amd64.h"
+#include "core.h"
+#include "util.h"
+
+using namespace std;
+using namespace util;
+
+int
+coreid::allocate_contiguous_aligned_block(unsigned n, unsigned alignment)
+{
+retry:
+  unsigned current = g_core_count.load(memory_order_acquire);
+  const unsigned rounded = slow_round_up(current, alignment);
+  const unsigned replace = rounded + n;
+  if (unlikely(replace > NMaxCores))
+    return -1;
+  if (!g_core_count.compare_exchange_strong(current, replace, memory_order_acq_rel)) {
+    nop_pause();
+    goto retry;
+  }
+  return rounded;
+}
+
+unsigned
+coreid::num_cpus_online()
+{
+  const long nprocs = sysconf(_SC_NPROCESSORS_ONLN);
+  ALWAYS_ASSERT(nprocs >= 1);
+  return nprocs;
+}
+
+__thread int coreid::tl_core_id = -1;
+atomic<unsigned> coreid::g_core_count(0);