fix a deadlock when pcm is interrupted during initialization

Change-Id: I1ab9d817ace1bac7e095ff41398ab670fdc54a6b

Author: rdementi

src/cpucounters.h

@@ -1064,6 +1064,8 @@ class PCM_API PCM
     bool isRDTDisabled() const;
 
 public:
+    static bool isInitialized() { return instance != nullptr; }
+
     //! check if TMA level 1 metrics are supported
     bool isHWTMAL1Supported() const;
 

src/utils.cpp

@@ -32,7 +32,7 @@ void exit_cleanup(void)
     restore_signal_handlers();
 
     // this replaces same call in cleanup() from util.h
-    PCM::getInstance()->cleanup(); // this replaces same call in cleanup() from util.h
+    if (PCM::isInitialized()) PCM::getInstance()->cleanup(); // this replaces same call in cleanup() from util.h
 
 //TODO: delete other shared objects.... if any.
 
@@ -141,7 +141,7 @@ BOOL sigINT_handler(DWORD fdwCtrlType)
 
     // in case PCM is blocked just return and summary will be dumped in
     // calling function, if needed
-    if (PCM::getInstance()->isBlocked()) {
+    if (PCM::isInitialized() && PCM::getInstance()->isBlocked()) {
         return FALSE;
     } else {
         exit_cleanup();
@@ -177,7 +177,7 @@ void sigINT_handler(int signum)
 
     // in case PCM is blocked just return and summary will be dumped in
     // calling function, if needed
-    if (PCM::getInstance()->isBlocked()) {
+    if (PCM::isInitialized() && PCM::getInstance()->isBlocked()) {
         return;
     } else {
         exit_cleanup();