Remove more raw pointers (#2556)

Make destructor public so std::unique_ptr can call it.  Also restrict
singleton creation to satisfy cppcheck.

src/curl.cpp

@@ -96,7 +96,7 @@ constexpr char   S3fsCurl::S3FS_SSL_PRIVKEY_PASSWORD[];
 std::mutex       S3fsCurl::curl_handles_lock;
 S3fsCurl::callback_locks_t S3fsCurl::callback_locks;
 bool             S3fsCurl::is_initglobal_done  = false;
-CurlHandlerPool* S3fsCurl::sCurlPool           = nullptr;
+std::unique_ptr<CurlHandlerPool> S3fsCurl::sCurlPool;
 int              S3fsCurl::sCurlPoolSize       = 32;
 CURLSH*          S3fsCurl::hCurlShare          = nullptr;
 bool             S3fsCurl::is_cert_check       = true; // default
@@ -163,7 +163,7 @@ bool S3fsCurl::InitS3fsCurl()
     // sCurlPoolSize must be over parallel(or multireq) count.
     //
     sCurlPoolSize = std::max({sCurlPoolSize, GetMaxParallelCount(), GetMaxMultiRequest()});
-    sCurlPool = new CurlHandlerPool(sCurlPoolSize);
+    sCurlPool.reset(new CurlHandlerPool(sCurlPoolSize));
     if (!sCurlPool->Init()) {
         return false;
     }
@@ -180,8 +180,7 @@ bool S3fsCurl::DestroyS3fsCurl()
     if(!sCurlPool->Destroy()){
         result = false;
     }
-    delete sCurlPool;
+    sCurlPool.reset();
-    sCurlPool = nullptr;
     if(!S3fsCurl::DestroyShareCurl()){
         result = false;
     }

src/curl.h

@@ -131,7 +131,7 @@ class S3fsCurl
             std::mutex      ssl_session;
         } callback_locks;
         static bool             is_initglobal_done;
-        static CurlHandlerPool* sCurlPool;
+        static std::unique_ptr<CurlHandlerPool> sCurlPool;
         static int              sCurlPoolSize;
         static CURLSH*          hCurlShare;
         static bool             is_cert_check;

src/openssl_auth.cpp

@@ -82,7 +82,7 @@ struct CRYPTO_dynlock_value
     std::mutex dyn_mutex;
 };
 
-static std::mutex* s3fs_crypt_mutex = nullptr;
+static std::unique_ptr<std::mutex[]> s3fs_crypt_mutex;
 
 static void s3fs_crypt_mutex_lock(int mode, int pos, const char* file, int line) __attribute__ ((unused)) NO_THREAD_SAFETY_ANALYSIS;
 static void s3fs_crypt_mutex_lock(int mode, int pos, const char* file, int line)
@@ -138,7 +138,7 @@ bool s3fs_init_crypt_mutex()
             return false;
         }
     }
-    s3fs_crypt_mutex = new std::mutex[CRYPTO_num_locks()];
+    s3fs_crypt_mutex.reset(new std::mutex[CRYPTO_num_locks()]);
     // static lock
     CRYPTO_set_locking_callback(s3fs_crypt_mutex_lock);
     CRYPTO_set_id_callback(s3fs_crypt_get_threadid);
@@ -163,8 +163,7 @@ bool s3fs_destroy_crypt_mutex()
     CRYPTO_set_locking_callback(nullptr);
 
     CRYPTO_cleanup_all_ex_data();
-    delete[] s3fs_crypt_mutex;
+    s3fs_crypt_mutex.reset();
-    s3fs_crypt_mutex = nullptr;
 
     return true;
 }

src/threadpoolman.cpp

@@ -30,7 +30,7 @@
 //------------------------------------------------
 // ThreadPoolMan class variables
 //------------------------------------------------
-ThreadPoolMan* ThreadPoolMan::singleton = nullptr;
+std::unique_ptr<ThreadPoolMan> ThreadPoolMan::singleton;
 
 //------------------------------------------------
 // ThreadPoolMan class methods
@@ -38,19 +38,16 @@ ThreadPoolMan* ThreadPoolMan::singleton = nullptr;
 bool ThreadPoolMan::Initialize(int count)
 {
     if(ThreadPoolMan::singleton){
-        S3FS_PRN_WARN("Already singleton for Thread Manager is existed, then re-create it.");
+        S3FS_PRN_CRIT("Already singleton for Thread Manager exists.");
-        ThreadPoolMan::Destroy();
+        abort();
     }
-    ThreadPoolMan::singleton = new ThreadPoolMan(count);
+    ThreadPoolMan::singleton.reset(new ThreadPoolMan(count));
     return true;
 }
 
 void ThreadPoolMan::Destroy()
 {
-    if(ThreadPoolMan::singleton){
+    ThreadPoolMan::singleton.reset();
-        delete ThreadPoolMan::singleton;
-        ThreadPoolMan::singleton = nullptr;
-    }
 }
 
 bool ThreadPoolMan::Instruct(const thpoolman_param& param)
@@ -119,7 +116,7 @@ ThreadPoolMan::ThreadPoolMan(int count) : is_exit(false), thpoolman_sem(0)
         abort();
     }
     if(ThreadPoolMan::singleton){
-        S3FS_PRN_CRIT("Already singleton for Thread Manager is existed.");
+        S3FS_PRN_CRIT("Already singleton for Thread Manager exists.");
         abort();
     }
 

src/threadpoolman.h

@@ -61,7 +61,7 @@ typedef std::list<thpoolman_param> thpoolman_params_t;
 class ThreadPoolMan
 {
     private:
-        static ThreadPoolMan* singleton;
+        static std::unique_ptr<ThreadPoolMan> singleton;
 
         std::atomic<bool>     is_exit;
         Semaphore             thpoolman_sem;
@@ -74,7 +74,6 @@ class ThreadPoolMan
         static void Worker(ThreadPoolMan* psingleton, std::promise<int> promise);
 
         explicit ThreadPoolMan(int count = 1);
-        ~ThreadPoolMan();
 
         bool IsExit() const;
         void SetExitFlag(bool exit_flag);
@@ -84,6 +83,7 @@ class ThreadPoolMan
         void SetInstruction(const thpoolman_param& pparam);
 
     public:
+        ~ThreadPoolMan();
         ThreadPoolMan(const ThreadPoolMan&) = delete;
         ThreadPoolMan(ThreadPoolMan&&) = delete;
         ThreadPoolMan& operator=(const ThreadPoolMan&) = delete;