[asan] move OS-dependent code away from asan_lock.h

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@147878 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 21 insertions, 0 deletions

diff --git a/lib/asan/asan_linux.cc b/lib/asan/asan_linux.cc
index a1be40e5e..17e2e379c 100644
--- a/lib/asan/asan_linux.cc
+++ b/lib/asan/asan_linux.cc
@@ -15,6 +15,7 @@
 
 #include "asan_interceptors.h"
 #include "asan_internal.h"
+#include "asan_lock.h"
 #include "asan_procmaps.h"
 #include "asan_thread.h"
 
@@ -276,6 +277,26 @@ void AsanThread::SetThreadStackTopAndBottom() {
   CHECK(AddrIsInStack((uintptr_t)&attr));
 }
 
+AsanLock::AsanLock(LinkerInitialized) {
+  // We assume that pthread_mutex_t initialized to all zeroes is a valid
+  // unlocked mutex. We can not use PTHREAD_MUTEX_INITIALIZER as it triggers
+  // a gcc warning:
+  // extended initializer lists only available with -std=c++0x or -std=gnu++0x
+}
+
+void AsanLock::Lock() {
+  CHECK(sizeof(pthread_mutex_t) <= sizeof(opaque_storage_));
+  pthread_mutex_lock((pthread_mutex_t*)&opaque_storage_);
+  CHECK(!owner_);
+  owner_ = (uintptr_t)pthread_self();
+}
+
+void AsanLock::Unlock() {
+  CHECK(owner_ == (uintptr_t)pthread_self());
+  owner_ = 0;
+  pthread_mutex_unlock((pthread_mutex_t*)&opaque_storage_);
+}
+
 }  // namespace __asan
 
 #endif  // __linux__