add WatchParameter and example

Signed-off-by: chuxuezhe11 <hanjixiao@huawei.com>

bin/BUILD.gn

@@ -26,6 +26,7 @@ ohos_static_library("bytrace_inner") {
     "hiviewdfx_hilog_native:libhilog",
     "ipc:ipc_core",
     "startup_l2:syspara",
+    "startup_l2:syspara_watchagent",
 
     #"distributedschedule:samgr_standard"
   ]
@@ -69,16 +70,23 @@ ohos_executable("bytrace") {
 }
 
 ohos_prebuilt_etc("bytrace.cfg") {
-  if (use_musl) {
-    source = "./config/bytrace.cfg"
-  } else {
-    source = "./config/bytrace.rc"
-  }
+  source = "./config/bytrace.cfg"
   relative_install_dir = "init"
   subsystem_name = "developtools"
   part_name = "bytrace_standard"
 }
 
-group("bytrace_target") {
-  deps = [ ":bytrace" ]
+ohos_executable("bytrace_example") {
+  sources = [ "example/bytrace_example.cpp" ]
+  deps = [ "${innerkits_path}/native:bytrace_core" ]
+  external_deps = [ "hiviewdfx_hilog_native:libhilog" ]
+  subsystem_name = "developtools"
+  part_name = "bytrace_standard"
+}
+
+group("bytrace_target") {
+  deps = [
+    ":bytrace",
+    ":bytrace_example",
+  ]
 }

bin/example/bytrace_example.cpp

@@ -0,0 +1,76 @@
+#include <cstring>
+#include <unistd.h>
+#include <iostream>
+#include <thread>
+#include "bytrace.h"
+
+using namespace std;
+constexpr uint64_t label = BYTRACE_TAG_OHOS;
+
+void func1()
+{
+    cout << "func 1" << endl;
+    sleep(1);
+}
+
+void func2()
+{
+    cout << "func 2" << endl;
+    sleep(2);
+}
+
+void func3()
+{
+    cout << "func 3" << endl;
+    int num = 0;
+    for(int i=0; i < 5; i++) {
+        CountTrace(BYTRACE_TAG_OHOS, "count number", ++num);
+        sleep(1);
+    }
+}
+
+void threadFunc1()
+{
+    StartAsyncTrace(label, "testAsync", 1111);
+    for (int i = 0; i < 5; ++i) {
+        cout << "t1" << endl;
+        sleep(1);
+    }
+}
+
+void threadFunc2()
+{
+    for (int i = 0; i < 5; ++i) {
+        cout << "t2" << endl;
+        sleep(1);
+    }
+    FinishAsyncTrace(label, "testAsync", 1111);
+}
+
+int main()
+{
+    thread t1(threadFunc1);
+    t1.join();
+
+    StartTrace(label, "testStart");
+    sleep(1);
+
+    StartTrace(label, "func1Start", 1); // 打印起始点
+    func1();
+    FinishTrace(label, "");
+    sleep(2);
+
+    thread t2(threadFunc2);
+    t2.join();
+
+    StartTrace(label, "func2Start", 2);
+    func2();
+    FinishTrace(label, "");
+    sleep(2);
+
+    sleep(1);
+    FinishTrace(label, "");
+    func3();
+
+    return 0;
+}

bin/src/bytrace_impl.cpp

@@ -22,6 +22,7 @@
 #include <vector>
 #include "bytrace.h"
 #include "hilog/log.h"
+#include "parameter.h"
 #include "parameters.h"
 
 using namespace std;
@@ -45,6 +46,15 @@ constexpr int NAME_MAX_SIZE = 1000;
 static std::vector<std::string> g_markTypes = {"B", "E", "S", "F", "C"};
 enum MarkerType { MARKER_BEGIN, MARKER_END, MARKER_ASYNC_BEGIN, MARKER_ASYNC_END, MARKER_INT, MARKER_MAX };
 
+constexpr uint64_t BYTRACE_TAG = 0xd03301;
+constexpr OHOS::HiviewDFX::HiLogLabel LABEL = {LOG_CORE, BYTRACE_TAG, "BytraceCore"};
+
+static void ParameterChange(const char* key, const char* value, void* context)
+{
+    HiLog::Info(LABEL, "ParameterChange %{public}s", key);
+    UpdateTraceLabel();
+}
+
 bool IsAppValid()
 {
     // Judge if application-level tracing is enabled.
@@ -94,12 +104,17 @@ void OpenTraceMarkerFile()
     if (g_markerFd == -1) {
         g_markerFd = open(traceFile.c_str(), O_WRONLY | O_CLOEXEC);
         if (g_markerFd == -1) {
-            fprintf(stderr, "Error opening trace file.\n");
+            HiLog::Error(LABEL, "open trace file %{public}s failed: %{public}s", traceFile.c_str(), strerror(errno));
             g_tagsProperty = 0;
             return;
         }
     }
     g_tagsProperty = GetSysParamTags();
+
+    if (WatchParameter(KEY_TRACE_TAG.c_str(), ParameterChange, nullptr) != 0) {
+        HiLog::Error(LABEL, "WatchParameter %{public}s failed", KEY_TRACE_TAG.c_str());
+        return;
+    }
     g_isBytraceInit = true;
 }
 }; // namespace