diff --git a/trunk/Dockerfile.builds b/trunk/Dockerfile.builds
index 65e71df1a..5a4e9205b 100644
--- a/trunk/Dockerfile.builds
+++ b/trunk/Dockerfile.builds
@@ -63,10 +63,10 @@ RUN cd /srs/trunk && ./configure --jobs=2 --srt=on && make -j2
 ########################################################
 FROM ossrs/srs:ubuntu16 AS ubuntu16-cross-armv7
 COPY . /srs
-RUN cd /srs/trunk && ./configure --jobs=2 --cross-build --cc=arm-linux-gnueabihf-gcc --cxx=arm-linux-gnueabihf-g++ \
+RUN cd /srs/trunk && ./configure --jobs=2 --srt=off --cross-build --cc=arm-linux-gnueabihf-gcc --cxx=arm-linux-gnueabihf-g++ \
     --ar=arm-linux-gnueabihf-ar --ld=arm-linux-gnueabihf-ld --randlib=arm-linux-gnueabihf-randlib && make -j2
 
 FROM ossrs/srs:ubuntu16 AS ubuntu16-cross-aarch64
 COPY . /srs
-RUN cd /srs/trunk && ./configure --jobs=2 --cross-build --cc=aarch64-linux-gnu-gcc --cxx=aarch64-linux-gnu-g++ \
+RUN cd /srs/trunk && ./configure --jobs=2 --srt=off --cross-build --cc=aarch64-linux-gnu-gcc --cxx=aarch64-linux-gnu-g++ \
     --ar=aarch64-linux-gnu-ar --ld=aarch64-linux-gnu-ld --randlib=aarch64-linux-gnu-randlib && make -j2
diff --git a/trunk/auto/options.sh b/trunk/auto/options.sh
index 7ab9e8fec..8358975f3 100755
--- a/trunk/auto/options.sh
+++ b/trunk/auto/options.sh
@@ -4,7 +4,7 @@
 help=no
 # feature options
 SRS_HDS=NO
-SRS_SRT=NO
+SRS_SRT=YES
 SRS_RTC=YES
 SRS_CXX11=YES
 SRS_CXX14=NO
diff --git a/trunk/configure b/trunk/configure
index 5be1d5f3e..86cf95eed 100755
--- a/trunk/configure
+++ b/trunk/configure
@@ -199,7 +199,7 @@ MODULE_ID="CORE"
 MODULE_DEPENDS=()
 ModuleLibIncs=(${SRS_OBJS_DIR})
 MODULE_FILES=("srs_core" "srs_core_version5" "srs_core_autofree" "srs_core_performance"
-		"srs_core_time" "srs_core_platform" "srs_core_lock")
+		"srs_core_time" "srs_core_platform")
 CORE_INCS="src/core"; MODULE_DIR=${CORE_INCS} . auto/modules.sh
 CORE_OBJS="${MODULE_OBJS[@]}"
 #
diff --git a/trunk/src/app/srs_app_log.cpp b/trunk/src/app/srs_app_log.cpp
index 38c10c4ff..764a41aec 100644
--- a/trunk/src/app/srs_app_log.cpp
+++ b/trunk/src/app/srs_app_log.cpp
@@ -18,7 +18,7 @@
 #include <srs_kernel_error.hpp>
 #include <srs_app_utility.hpp>
 #include <srs_kernel_utility.hpp>
-#include <srs_core_lock.hpp>
+#include <srs_app_threads.hpp>
 
 // the max size of a line of log.
 #define LOG_MAX_SIZE 8192
@@ -37,7 +37,7 @@ SrsFileLog::SrsFileLog()
     log_to_file_tank = false;
     utc = false;
 
-    pthread_mutex_init(&mutex_, NULL);
+    mutex_ = new SrsMutex();
 }
 
 SrsFileLog::~SrsFileLog()
@@ -53,7 +53,7 @@ SrsFileLog::~SrsFileLog()
         _srs_config->unsubscribe(this);
     }
 
-    pthread_mutex_destroy(&mutex_);
+    srs_freep(mutex_);
 }
 
 srs_error_t SrsFileLog::initialize()
@@ -84,95 +84,95 @@ void SrsFileLog::reopen()
 
 void SrsFileLog::verbose(const char* tag, SrsContextId context_id, const char* fmt, ...)
 {
-    SrsScopeLock sl(&mutex_);
+    SrsAutoLock sl(mutex_);
 
     if (level > SrsLogLevelVerbose) {
         return;
     }
-    
+
     int size = 0;
     if (!srs_log_header(log_data, LOG_MAX_SIZE, utc, false, tag, context_id, "Verb", &size)) {
         return;
     }
-    
+
     va_list ap;
     va_start(ap, fmt);
     // we reserved 1 bytes for the new line.
     size += vsnprintf(log_data + size, LOG_MAX_SIZE - size, fmt, ap);
     va_end(ap);
-    
+
     write_log(fd, log_data, size, SrsLogLevelVerbose);
 }
 
 void SrsFileLog::info(const char* tag, SrsContextId context_id, const char* fmt, ...)
 {
-    SrsScopeLock sl(&mutex_);
+    SrsAutoLock sl(mutex_);
 
     if (level > SrsLogLevelInfo) {
         return;
     }
-    
+
     int size = 0;
     if (!srs_log_header(log_data, LOG_MAX_SIZE, utc, false, tag, context_id, "Debug", &size)) {
         return;
     }
-    
+
     va_list ap;
     va_start(ap, fmt);
     // we reserved 1 bytes for the new line.
     size += vsnprintf(log_data + size, LOG_MAX_SIZE - size, fmt, ap);
     va_end(ap);
-    
+
     write_log(fd, log_data, size, SrsLogLevelInfo);
 }
 
 void SrsFileLog::trace(const char* tag, SrsContextId context_id, const char* fmt, ...)
 {
-    SrsScopeLock sl(&mutex_);
+    SrsAutoLock sl(mutex_);
 
     if (level > SrsLogLevelTrace) {
         return;
     }
-    
+
     int size = 0;
     if (!srs_log_header(log_data, LOG_MAX_SIZE, utc, false, tag, context_id, "Trace", &size)) {
         return;
     }
-    
+
     va_list ap;
     va_start(ap, fmt);
     // we reserved 1 bytes for the new line.
     size += vsnprintf(log_data + size, LOG_MAX_SIZE - size, fmt, ap);
     va_end(ap);
-    
+
     write_log(fd, log_data, size, SrsLogLevelTrace);
 }
 
 void SrsFileLog::warn(const char* tag, SrsContextId context_id, const char* fmt, ...)
 {
-    SrsScopeLock sl(&mutex_);
+    SrsAutoLock sl(mutex_);
 
     if (level > SrsLogLevelWarn) {
         return;
     }
-    
+
     int size = 0;
     if (!srs_log_header(log_data, LOG_MAX_SIZE, utc, true, tag, context_id, "Warn", &size)) {
         return;
     }
-    
+
     va_list ap;
     va_start(ap, fmt);
     // we reserved 1 bytes for the new line.
     size += vsnprintf(log_data + size, LOG_MAX_SIZE - size, fmt, ap);
     va_end(ap);
-    
+
     write_log(fd, log_data, size, SrsLogLevelWarn);
 }
 
 void SrsFileLog::error(const char* tag, SrsContextId context_id, const char* fmt, ...)
 {
-    SrsScopeLock sl(&mutex_);
+    SrsAutoLock sl(mutex_);
 
     if (level > SrsLogLevelError) {
         return;
diff --git a/trunk/src/app/srs_app_log.hpp b/trunk/src/app/srs_app_log.hpp
index fc0cbcccd..aefd91e26 100644
--- a/trunk/src/app/srs_app_log.hpp
+++ b/trunk/src/app/srs_app_log.hpp
@@ -15,6 +15,8 @@
 #include <srs_app_reload.hpp>
 #include <srs_protocol_log.hpp>
 
+class SrsMutex;
+
 // For log TAGs.
 #define TAG_MAIN "MAIN"
 #define TAG_MAYBE "MAYBE"
@@ -41,7 +43,7 @@ private:
     bool utc;
     // TODO: FIXME: use macro define like SRS_MULTI_THREAD_LOG to switch enable log mutex or not.
     // Mutex for multithread log.
-    pthread_mutex_t mutex_;
+    SrsMutex* mutex_;
 public:
     SrsFileLog();
     virtual ~SrsFileLog();
diff --git a/trunk/src/app/srs_app_threads.cpp b/trunk/src/app/srs_app_threads.cpp
index 594da7918..e9c699913 100644
--- a/trunk/src/app/srs_app_threads.cpp
+++ b/trunk/src/app/srs_app_threads.cpp
@@ -26,6 +26,7 @@
 #include <srs_app_srt_source.hpp>
 #endif
 
+#include <stdlib.h>
 #include <string>
 using namespace std;
 
@@ -427,3 +428,38 @@ srs_error_t srs_thread_initialize()
     return err;
 }
 
+SrsMutex::SrsMutex()
+{
+    int rc = pthread_mutex_init(&mutex_, NULL);
+    srs_assert(!rc);
+}
+
+SrsMutex::~SrsMutex()
+{
+    int rc = pthread_mutex_destroy(&mutex_);
+    srs_assert(!rc);
+}
+
+void SrsMutex::lock()
+{
+    int rc = pthread_mutex_lock(&mutex_);
+    srs_assert(!rc);
+}
+
+void SrsMutex::unlock()
+{
+    int rc = pthread_mutex_unlock(&mutex_);
+    srs_assert(!rc);
+}
+
+SrsAutoLock::SrsAutoLock(SrsMutex* mutex)
+{
+    mutex_ = mutex;
+    mutex_->lock();
+}
+
+SrsAutoLock::~SrsAutoLock()
+{
+    mutex_->unlock();
+}
+
diff --git a/trunk/src/app/srs_app_threads.hpp b/trunk/src/app/srs_app_threads.hpp
index 7d5338c48..0f57b4ddd 100644
--- a/trunk/src/app/srs_app_threads.hpp
+++ b/trunk/src/app/srs_app_threads.hpp
@@ -11,6 +11,8 @@
 
 #include <srs_app_hourglass.hpp>
 
+#include <pthread.h>
+
 // Protect server in high load.
 class SrsCircuitBreaker : public ISrsFastTimer
 {
@@ -49,5 +51,28 @@ extern SrsCircuitBreaker* _srs_circuit_breaker;
 // Initialize global or thread-local variables.
 extern srs_error_t srs_thread_initialize();
 
+// Wrapper for mutex.
+class SrsMutex
+{
+private:
+    pthread_mutex_t mutex_;
+public:
+    SrsMutex();
+    ~SrsMutex();
+public:
+    void lock();
+    void unlock();
+};
+
+// Lock the mutex when enter current scope, and unlock it when out.
+class SrsAutoLock
+{
+private:
+    SrsMutex* mutex_;
+public:
+    SrsAutoLock(SrsMutex* mutex);
+    ~SrsAutoLock();
+};
+
 #endif
 
diff --git a/trunk/src/core/srs_core_lock.cpp b/trunk/src/core/srs_core_lock.cpp
deleted file mode 100644
index a2da00e24..000000000
--- a/trunk/src/core/srs_core_lock.cpp
+++ /dev/null
@@ -1,8 +0,0 @@
-//
-// Copyright (c) 2013-2021 The SRS Authors
-//
-// SPDX-License-Identifier: MIT or MulanPSL-2.0
-//
-
-#include <srs_core_autofree.hpp>
-
diff --git a/trunk/src/core/srs_core_lock.hpp b/trunk/src/core/srs_core_lock.hpp
deleted file mode 100644
index 3eb1c1d3c..000000000
--- a/trunk/src/core/srs_core_lock.hpp
+++ /dev/null
@@ -1,57 +0,0 @@
-//
-// 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