!6154 Remove the timeout function in kernel build client.

Merge pull request !6154 from 张清华/master2

mindspore/ccsrc/backend/session/kernel_build_client.h

@@ -58,8 +58,6 @@ class KernelBuildClient {
     if (!init_) {
       // Exception's thrown if open failed
       if (dp_->Open({GetEnv(), GetScript()}, true) != -1) {
-        dp_->SetTimeOutSeconds(kTimeOutSeconds);
-        dp_->SetTimeOutCallback(std::make_shared<std::function<void()>>([this]() { Close(); }));
         dp_->SetFinalizeCallback(std::make_shared<std::function<void()>>([this]() { Close(); }));
         init_ = true;
       }

mindspore/ccsrc/common/duplex_pipe.cc

@@ -152,7 +152,7 @@ void DuplexPipe::Close() {
 DuplexPipe::SignalHandler::SignalHandler(std::shared_ptr<DuplexPipe> dp, pid_t pid) {
   dp_ = dp;
   child_pid_ = pid;
-  signal(SIGCHLD, SigChildHandler);
+  signal(SIGCHLD, SIG_IGN);
   signal(SIGPIPE, SigPipeHandler);
 }
 
@@ -178,16 +178,4 @@ void DuplexPipe::SignalHandler::SigPipeHandler(int sig) {
     dp_->NotifyFinalize();
   }
 }
-
-void DuplexPipe::SignalHandler::SigChildHandler(int sig) {
-  DP_INFO << "Signal: " << sig << ", child_pid_: " << child_pid_;
-  int status;
-  auto pid = waitpid(child_pid_, &status, WNOHANG | WUNTRACED);
-  if (WIFEXITED(status)) {  // Normal exit
-    DP_INFO << "Child exited, status: " << WEXITSTATUS(status) << ", pid: " << pid << ", dp: " << dp_;
-    if (pid > 0 && dp_ != nullptr) {  // It's child_pid_
-      dp_->NotifyFinalize();
-    }
-  }
-}
 }  // namespace mindspore

mindspore/ccsrc/common/duplex_pipe.h

@@ -61,12 +61,12 @@ class DuplexPipe : public std::enable_shared_from_this<mindspore::DuplexPipe> {
 
  private:
   void SetTimeOut() {
-    if (signal_handler_ != nullptr) {
+    if (time_out_callback_ != nullptr && signal_handler_ != nullptr) {
       signal_handler_->SetAlarm(time_out_secs_);
     }
   }
   void CancelTimeOut() {
-    if (signal_handler_ != nullptr) {
+    if (time_out_callback_ != nullptr && signal_handler_ != nullptr) {
       signal_handler_->CancelAlarm();
     }
   }
@@ -118,7 +118,6 @@ class DuplexPipe : public std::enable_shared_from_this<mindspore::DuplexPipe> {
    private:
     static void SigAlarmHandler(int sig);
     static void SigPipeHandler(int sig);
-    static void SigChildHandler(int sig);
 
     inline static std::shared_ptr<DuplexPipe> dp_;
     inline static pid_t child_pid_;