SRT: add srs_core_lock, support scope lock guard

Author: xiaozhihong

trunk/configure

@@ -199,7 +199,7 @@ MODULE_ID="CORE"
 MODULE_DEPENDS=()
 ModuleLibIncs=(${SRS_OBJS_DIR})
 MODULE_FILES=("srs_core" "srs_core_version5" "srs_core_autofree" "srs_core_performance"
-		"srs_core_time" "srs_core_platform")
+		"srs_core_time" "srs_core_platform" "srs_core_lock")
 CORE_INCS="src/core"; MODULE_DIR=${CORE_INCS} . auto/modules.sh
 CORE_OBJS="${MODULE_OBJS[@]}"
 #

trunk/src/core/srs_core_lock.cpp

@@ -0,0 +1,8 @@
+//
+// Copyright (c) 2013-2021 The SRS Authors
+//
+// SPDX-License-Identifier: MIT or MulanPSL-2.0
+//
+
+#include <srs_core_autofree.hpp>
+

trunk/src/core/srs_core_lock.hpp

@@ -0,0 +1,57 @@
+//
+// Copyright (c) 2013-2021 The SRS Authors
+//
+// SPDX-License-Identifier: MIT or MulanPSL-2.0
+//
+
+#ifndef SRS_CORE_LOCK_HPP
+#define SRS_CORE_LOCK_HPP
+
+#include <pthread.h>
+
+#include <srs_core.hpp>
+
+#include <stdlib.h>
+
+class SrsScopeLock
+{
+private:
+    pthread_mutex_t* mutex_;
+    bool locked_;
+
+public:
+    explicit SrsScopeLock(pthread_mutex_t* mutex)
+    {
+        mutex_ = mutex;
+        locked_ = false;
+
+        lock();
+    }
+
+    ~SrsScopeLock()
+    {
+        unlock();
+    }
+
+    void lock()
+    {
+        if (locked_) {
+            return;
+        }
+
+        locked_ = true;
+        pthread_mutex_lock(mutex_);
+    }
+
+    void unlock()
+    {
+        if (! locked_) {
+            return;
+        }
+
+        locked_ = false;
+        pthread_mutex_unlock(mutex_);
+    }
+};
+
+#endif