diff --git a/trunk/configure b/trunk/configure
index b1313d8c0..ec7220d6b 100755
--- a/trunk/configure
+++ b/trunk/configure
@@ -200,7 +200,7 @@ MODULE_ID="CORE"
 MODULE_DEPENDS=()
 ModuleLibIncs=(${SRS_OBJS_DIR})
 MODULE_FILES=("srs_core" "srs_core_version5" "srs_core_autofree" "srs_core_performance"
-		"srs_core_time")
+		"srs_core_time" "srs_core_platform")
 CORE_INCS="src/core"; MODULE_DIR=${CORE_INCS} . auto/modules.sh
 CORE_OBJS="${MODULE_OBJS[@]}"
 #
diff --git a/trunk/src/app/srs_app_server.cpp b/trunk/src/app/srs_app_server.cpp
index c2e1cce25..675ca7433 100644
--- a/trunk/src/app/srs_app_server.cpp
+++ b/trunk/src/app/srs_app_server.cpp
@@ -1626,7 +1626,7 @@ srs_error_t SrsServerAdapter::initialize()
     return err;
 }
 
-srs_error_t SrsServerAdapter::run()
+srs_error_t SrsServerAdapter::run(SrsWaitGroup* wg)
 {
     srs_error_t err = srs_success;
 
@@ -1663,7 +1663,7 @@ srs_error_t SrsServerAdapter::run()
         return srs_error_wrap(err, "ingest");
     }
 
-    if ((err = srs->start()) != srs_success) {
+    if ((err = srs->start(wg)) != srs_success) {
         return srs_error_wrap(err, "start");
     }
 
diff --git a/trunk/src/app/srs_app_server.hpp b/trunk/src/app/srs_app_server.hpp
index 44aa62ac2..8e15ab6b0 100644
--- a/trunk/src/app/srs_app_server.hpp
+++ b/trunk/src/app/srs_app_server.hpp
@@ -343,7 +343,7 @@ public:
     virtual ~SrsServerAdapter();
 public:
     virtual srs_error_t initialize();
-    virtual srs_error_t run();
+    virtual srs_error_t run(SrsWaitGroup* wg);
     virtual void stop();
 public:
     virtual SrsServer* instance();
diff --git a/trunk/src/core/srs_core.hpp b/trunk/src/core/srs_core.hpp
index e40b9c098..d8c1aeeb1 100644
--- a/trunk/src/core/srs_core.hpp
+++ b/trunk/src/core/srs_core.hpp
@@ -32,34 +32,8 @@
 #define VERSION_STABLE 4
 #define VERSION_STABLE_BRANCH SRS_XSTR(VERSION_STABLE) ".0release"
 
-// For 32bit os, 2G big file limit for unistd io,
-// ie. read/write/lseek to use 64bits size for huge file.
-#ifndef _FILE_OFFSET_BITS
-    #define _FILE_OFFSET_BITS 64
-#endif
-
-// For int64_t print using PRId64 format.
-#ifndef __STDC_FORMAT_MACROS
-    #define __STDC_FORMAT_MACROS
-#endif
-
-// For RTC/FFMPEG build.
-#if defined(SRS_RTC) && !defined(__STDC_CONSTANT_MACROS)
-    #define __STDC_CONSTANT_MACROS
-#endif
-
-// For srs-librtmp, @see https://github.com/ossrs/srs/issues/213
-#ifndef _WIN32
-#include <inttypes.h>
-#endif
-
-#include <assert.h>
-#ifndef srs_assert
-#define srs_assert(expression) assert(expression)
-#endif
-
-#include <stddef.h>
-#include <sys/types.h>
+// For platform specified headers and defines.
+#include <srs_core_platform.hpp>
 
 // The time unit for timeout, interval or duration.
 #include <srs_core_time.hpp>
diff --git a/trunk/src/core/srs_core_platform.cpp b/trunk/src/core/srs_core_platform.cpp
new file mode 100644
index 000000000..1da0af075
--- /dev/null
+++ b/trunk/src/core/srs_core_platform.cpp
@@ -0,0 +1,8 @@
+//
+// Copyright (c) 2013-2021 The SRS Authors
+//
+// SPDX-License-Identifier: MIT
+//
+
+#include <srs_core_platform.hpp>
+
diff --git a/trunk/src/core/srs_core_platform.hpp b/trunk/src/core/srs_core_platform.hpp
new file mode 100644
index 000000000..c55f8e452
--- /dev/null
+++ b/trunk/src/core/srs_core_platform.hpp
@@ -0,0 +1,45 @@
+//
+// Copyright (c) 2013-2021 The SRS Authors
+//
+// SPDX-License-Identifier: MIT
+//
+
+#ifndef SRS_CORE_PLATFORM_HPP
+#define SRS_CORE_PLATFORM_HPP
+
+// For 32bit os, 2G big file limit for unistd io,
+// ie. read/write/lseek to use 64bits size for huge file.
+#ifndef _FILE_OFFSET_BITS
+#define _FILE_OFFSET_BITS 64
+#endif
+
+// For int64_t print using PRId64 format.
+#ifndef __STDC_FORMAT_MACROS
+#define __STDC_FORMAT_MACROS
+#endif
+
+// For RTC/FFMPEG build.
+#if defined(SRS_RTC) && !defined(__STDC_CONSTANT_MACROS)
+#define __STDC_CONSTANT_MACROS
+#endif
+
+// For srs-librtmp, @see https://github.com/ossrs/srs/issues/213
+#ifndef _WIN32
+#include <inttypes.h>
+#endif
+
+#include <assert.h>
+#ifndef srs_assert
+#define srs_assert(expression) assert(expression)
+#endif
+
+#include <stddef.h>
+#include <sys/types.h>
+
+// For CentOS 6 or C++98, @see https://github.com/ossrs/srs/issues/2815
+#ifndef UINT32_MAX
+#define UINT32_MAX (4294967295U)
+#endif
+
+#endif
+
diff --git a/trunk/src/kernel/srs_kernel_rtc_rtcp.cpp b/trunk/src/kernel/srs_kernel_rtc_rtcp.cpp
index dd4fdcfaf..647f5dd19 100644
--- a/trunk/src/kernel/srs_kernel_rtc_rtcp.cpp
+++ b/trunk/src/kernel/srs_kernel_rtc_rtcp.cpp
@@ -1010,7 +1010,7 @@ srs_error_t SrsRtcpTWCC::process_pkt_chunk(SrsRtcpTWCC::SrsRtcpTWCCChunk& chunk,
     size_t needed_chunk_size = chunk.size == 0 ? kTwccFbChunkBytes : 0;
 
     size_t might_occupied = pkt_len + needed_chunk_size + delta_size;
-    if (might_occupied > kRtcpPacketSize) {
+    if (might_occupied > (size_t)kRtcpPacketSize) {
         return srs_error_new(ERROR_RTC_RTCP, "might_occupied %zu", might_occupied);
     }