tsan: use a single background thread for memory profiler and memory flush (and later for symbolizer flush)

llvm-svn: 177627

1 files changed, 12 insertions, 0 deletions

diff --git a/compiler-rt/lib/sanitizer_common/sanitizer_linux.cc b/compiler-rt/lib/sanitizer_common/sanitizer_linux.cc
index 3c9ae418af7..5f490145c0c 100644
--- a/compiler-rt/lib/sanitizer_common/sanitizer_linux.cc
+++ b/compiler-rt/lib/sanitizer_common/sanitizer_linux.cc
@@ -44,6 +44,12 @@
 #include <sys/signal.h>
 #endif
 
+// <linux/time.h>
+struct kernel_timeval {
+  long tv_sec;
+  long tv_usec;
+};
+
 // <linux/futex.h> is broken on some linux distributions.
 const int FUTEX_WAIT = 0;
 const int FUTEX_WAKE = 1;
@@ -177,6 +183,12 @@ uptr GetTid() {
   return syscall(__NR_gettid);
 }
 
+u64 NanoTime() {
+  kernel_timeval tv;
+  syscall(__NR_gettimeofday, &tv, 0);
+  return (u64)tv.tv_sec * 1000*1000*1000 + tv.tv_usec * 1000;
+}
+
 void GetThreadStackTopAndBottom(bool at_initialization, uptr *stack_top,
                                 uptr *stack_bottom) {
   static const uptr kMaxThreadStackSize = 256 * (1 << 20);  // 256M