CTest: convert timeouts to std::chrono::duration

This commit continues the refactoring of CTest to adopt std::chrono.
After the last sets of changes that introduced std::chrono::steady_clock
and std::chrono::system_clock respectively, it makes sense to have all
the timeouts be stored as std::chrono::duration.

No functional change intended.

15 files changed, 240 insertions, 126 deletions

diff --git a/Source/CTest/cmCTestBuildAndTestHandler.cxx b/Source/CTest/cmCTestBuildAndTestHandler.cxx
index b603758..672087d 100644
--- a/Source/CTest/cmCTestBuildAndTestHandler.cxx
+++ b/Source/CTest/cmCTestBuildAndTestHandler.cxx
@@ -337,7 +337,7 @@ int cmCTestBuildAndTestHandler::RunCMakeAndTest(std::string* outstring)
   }
 
   int runTestRes = this->CTest->RunTest(testCommand, &outs, &retval, nullptr,
-                                        remainingTime.count(), nullptr);
+                                        remainingTime, nullptr);
 
   if (runTestRes != cmsysProcess_State_Exited || retval != 0) {
     out << "Test command failed: " << testCommand[0] << "\n";
diff --git a/Source/CTest/cmCTestBuildHandler.cxx b/Source/CTest/cmCTestBuildHandler.cxx
index 79446e8..ef4d3c6 100644
--- a/Source/CTest/cmCTestBuildHandler.cxx
+++ b/Source/CTest/cmCTestBuildHandler.cxx
@@ -282,7 +282,7 @@ int cmCTestBuildHandler::ProcessHandler()
                      this->Quiet);
 
   // do we have time for this
-  if (this->CTest->GetRemainingTimeAllowed() < 120) {
+  if (this->CTest->GetRemainingTimeAllowed() < std::chrono::minutes(2)) {
     return 0;
   }
 
diff --git a/Source/CTest/cmCTestConfigureHandler.cxx b/Source/CTest/cmCTestConfigureHandler.cxx
index 7c5b3b0..eb067e5 100644
--- a/Source/CTest/cmCTestConfigureHandler.cxx
+++ b/Source/CTest/cmCTestConfigureHandler.cxx
@@ -62,8 +62,9 @@ int cmCTestConfigureHandler::ProcessHandler()
     cmCTestOptionalLog(this->CTest, HANDLER_VERBOSE_OUTPUT,
                        "Configure with command: " << cCommand << std::endl,
                        this->Quiet);
-    res = this->CTest->RunMakeCommand(cCommand.c_str(), output, &retVal,
-                                      buildDirectory.c_str(), 0, ofs);
+    res = this->CTest->RunMakeCommand(
+      cCommand.c_str(), output, &retVal, buildDirectory.c_str(),
+      std::chrono::duration<double>::zero(), ofs);
 
     if (ofs) {
       ofs.close();
diff --git a/Source/CTest/cmCTestCoverageHandler.cxx b/Source/CTest/cmCTestCoverageHandler.cxx
index 69cd08c..39b90d8 100644
--- a/Source/CTest/cmCTestCoverageHandler.cxx
+++ b/Source/CTest/cmCTestCoverageHandler.cxx
@@ -11,6 +11,7 @@
 #include "cmParseGTMCoverage.h"
 #include "cmParseJacocoCoverage.h"
 #include "cmParsePHPCoverage.h"
+#include "cmProcess.h"
 #include "cmSystemTools.h"
 #include "cmWorkingDirectory.h"
 #include "cmXMLWriter.h"
@@ -40,7 +41,7 @@ public:
   {
     this->Process = cmsysProcess_New();
     this->PipeState = -1;
-    this->TimeOut = -1;
+    this->TimeOut = std::chrono::duration<double>(-1);
   }
   ~cmCTestRunProcess()
   {
@@ -64,7 +65,7 @@ public:
     }
   }
   void SetWorkingDirectory(const char* dir) { this->WorkingDirectory = dir; }
-  void SetTimeout(double t) { this->TimeOut = t; }
+  void SetTimeout(std::chrono::duration<double> t) { this->TimeOut = t; }
   bool StartProcess()
   {
     std::vector<const char*> args;
@@ -79,7 +80,7 @@ public:
     }
 
     cmsysProcess_SetOption(this->Process, cmsysProcess_Option_HideWindow, 1);
-    if (this->TimeOut != -1) {
+    if (this->TimeOut >= std::chrono::duration<double>::zero()) {
       cmsysProcess_SetTimeout(this->Process, this->TimeOut);
     }
     cmsysProcess_Execute(this->Process);
@@ -108,7 +109,7 @@ private:
   cmsysProcess* Process;
   std::vector<std::string> CommandLineStrings;
   std::string WorkingDirectory;
-  double TimeOut;
+  std::chrono::duration<double> TimeOut;
 };
 
 cmCTestCoverageHandler::cmCTestCoverageHandler()
@@ -276,7 +277,7 @@ int cmCTestCoverageHandler::ProcessHandler()
   this->CTest->ClearSubmitFiles(cmCTest::PartCoverage);
   int error = 0;
   // do we have time for this
-  if (this->CTest->GetRemainingTimeAllowed() < 120) {
+  if (this->CTest->GetRemainingTimeAllowed() < std::chrono::minutes(2)) {
     return error;
   }
 
@@ -1022,8 +1023,9 @@ int cmCTestCoverageHandler::HandleGCovCoverage(
     int retVal = 0;
     *cont->OFS << "* Run coverage for: " << fileDir << std::endl;
     *cont->OFS << "  Command: " << command << std::endl;
-    int res = this->CTest->RunCommand(covargs, &output, &errors, &retVal,
-                                      tempDir.c_str(), 0 /*this->TimeOut*/);
+    int res = this->CTest->RunCommand(
+      covargs, &output, &errors, &retVal, tempDir.c_str(),
+      std::chrono::duration<double>::zero() /*this->TimeOut*/);
 
     *cont->OFS << "  Output: " << output << std::endl;
     *cont->OFS << "  Errors: " << errors << std::endl;
@@ -1386,8 +1388,9 @@ int cmCTestCoverageHandler::HandleLCovCoverage(
     int retVal = 0;
     *cont->OFS << "* Run coverage for: " << fileDir << std::endl;
     *cont->OFS << "  Command: " << command << std::endl;
-    int res = this->CTest->RunCommand(covargs, &output, &errors, &retVal,
-                                      fileDir.c_str(), 0 /*this->TimeOut*/);
+    int res = this->CTest->RunCommand(
+      covargs, &output, &errors, &retVal, fileDir.c_str(),
+      std::chrono::duration<double>::zero() /*this->TimeOut*/);
 
     *cont->OFS << "  Output: " << output << std::endl;
     *cont->OFS << "  Errors: " << errors << std::endl;
diff --git a/Source/CTest/cmCTestRunTest.cxx b/Source/CTest/cmCTestRunTest.cxx
index 99531af..830ebdf 100644
--- a/Source/CTest/cmCTestRunTest.cxx
+++ b/Source/CTest/cmCTestRunTest.cxx
@@ -1,5 +1,9 @@
 /* Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
    file Copyright.txt or https://cmake.org/licensing for details.  */
+#ifdef _WIN32
+/* windows.h defines min() and max() macros that interfere. */
+#define NOMINMAX
+#endif
 #include "cmCTestRunTest.h"
 
 #include "cmCTest.h"
@@ -14,6 +18,7 @@
 #include "cmsys/Base64.h"
 #include "cmsys/Process.h"
 #include "cmsys/RegularExpression.hxx"
+#include <algorithm>
 #include <chrono>
 #include <iomanip>
 #include <sstream>
@@ -26,7 +31,7 @@ cmCTestRunTest::cmCTestRunTest(cmCTestTestHandler* handler)
   this->CTest = handler->CTest;
   this->TestHandler = handler;
   this->TestProcess = nullptr;
-  this->TestResult.ExecutionTime = 0;
+  this->TestResult.ExecutionTime = std::chrono::duration<double>::zero();
   this->TestResult.ReturnValue = 0;
   this->TestResult.Status = cmCTestTestHandler::NOT_RUN;
   this->TestResult.TestCount = 0;
@@ -52,7 +57,7 @@ bool cmCTestRunTest::CheckOutput()
   std::string line;
   while ((timeout = timeEnd - std::chrono::steady_clock::now(),
           timeout > std::chrono::seconds(0))) {
-    int p = this->TestProcess->GetNextOutputLine(line, timeout.count());
+    int p = this->TestProcess->GetNextOutputLine(line, timeout);
     if (p == cmsysProcess_Pipe_None) {
       // Process has terminated and all output read.
       return false;
@@ -71,7 +76,9 @@ bool cmCTestRunTest::CheckOutput()
             cmCTestLog(this->CTest, HANDLER_VERBOSE_OUTPUT, this->GetIndex()
                          << ": "
                          << "Test timeout changed to "
-                         << this->TestProperties->AlternateTimeout
+                         << std::chrono::duration_cast<std::chrono::seconds>(
+                              this->TestProperties->AlternateTimeout)
+                              .count()
                          << std::endl);
             this->TestProcess->ResetStartTime();
             this->TestProcess->ChangeTimeout(
@@ -259,7 +266,11 @@ bool cmCTestRunTest::EndTest(size_t completed, size_t total, bool started)
 
   passed = this->TestResult.Status == cmCTestTestHandler::COMPLETED;
   char buf[1024];
-  sprintf(buf, "%6.2f sec", this->TestProcess->GetTotalTime());
+  sprintf(buf, "%6.2f sec",
+          double(std::chrono::duration_cast<std::chrono::milliseconds>(
+                   this->TestProcess->GetTotalTime())
+                   .count()) /
+            1000.0);
   cmCTestLog(this->CTest, HANDLER_OUTPUT, buf << "\n");
 
   if (outputTestErrorsToConsole) {
@@ -295,12 +306,16 @@ bool cmCTestRunTest::EndTest(size_t completed, size_t total, bool started)
       reasonType = "Test Fail Reason";
       pass = false;
     }
-    double ttime = this->TestProcess->GetTotalTime();
-    int hours = static_cast<int>(ttime / (60 * 60));
-    int minutes = static_cast<int>(ttime / 60) % 60;
-    int seconds = static_cast<int>(ttime) % 60;
+    auto ttime = this->TestProcess->GetTotalTime();
+    auto hours = std::chrono::duration_cast<std::chrono::hours>(ttime);
+    ttime -= hours;
+    auto minutes = std::chrono::duration_cast<std::chrono::minutes>(ttime);
+    ttime -= minutes;
+    auto seconds = std::chrono::duration_cast<std::chrono::seconds>(ttime);
     char buffer[100];
-    sprintf(buffer, "%02d:%02d:%02d", hours, minutes, seconds);
+    sprintf(buffer, "%02d:%02d:%02d", static_cast<unsigned>(hours.count()),
+            static_cast<unsigned>(minutes.count()),
+            static_cast<unsigned>(seconds.count()));
     *this->TestHandler->LogFile
       << "----------------------------------------------------------"
       << std::endl;
@@ -380,7 +395,11 @@ void cmCTestRunTest::ComputeWeightedCost()
 {
   double prev = static_cast<double>(this->TestProperties->PreviousRuns);
   double avgcost = static_cast<double>(this->TestProperties->Cost);
-  double current = this->TestResult.ExecutionTime;
+  double current =
+    double(std::chrono::duration_cast<std::chrono::milliseconds>(
+             this->TestResult.ExecutionTime)
+             .count()) /
+    1000.0;
 
   if (this->TestResult.Status == cmCTestTestHandler::COMPLETED) {
     this->TestProperties->Cost =
@@ -418,7 +437,7 @@ bool cmCTestRunTest::StartTest(size_t total)
   // Return immediately if test is disabled
   if (this->TestProperties->Disabled) {
     this->TestResult.Properties = this->TestProperties;
-    this->TestResult.ExecutionTime = 0;
+    this->TestResult.ExecutionTime = std::chrono::duration<double>::zero();
     this->TestResult.CompressOutput = false;
     this->TestResult.ReturnValue = -1;
     this->TestResult.CompletionStatus = "Disabled";
@@ -435,7 +454,7 @@ bool cmCTestRunTest::StartTest(size_t total)
   this->ComputeArguments();
   std::vector<std::string>& args = this->TestProperties->Args;
   this->TestResult.Properties = this->TestProperties;
-  this->TestResult.ExecutionTime = 0;
+  this->TestResult.ExecutionTime = std::chrono::duration<double>::zero();
   this->TestResult.CompressOutput = false;
   this->TestResult.ReturnValue = -1;
   this->TestResult.CompletionStatus = "Failed to start";
@@ -512,7 +531,7 @@ bool cmCTestRunTest::StartTest(size_t total)
   }
   this->StartTime = this->CTest->CurrentTime();
 
-  double timeout = this->ResolveTimeout();
+  auto timeout = this->ResolveTimeout();
 
   if (this->StopTimePassed) {
     return false;
@@ -593,9 +612,9 @@ void cmCTestRunTest::DartProcessing()
   }
 }
 
-double cmCTestRunTest::ResolveTimeout()
+std::chrono::duration<double> cmCTestRunTest::ResolveTimeout()
 {
-  double timeout = this->TestProperties->Timeout;
+  auto timeout = this->TestProperties->Timeout;
 
   if (this->CTest->GetStopTime().empty()) {
     return timeout;
@@ -625,31 +644,37 @@ double cmCTestRunTest::ResolveTimeout()
           lctime->tm_mon + 1, lctime->tm_mday,
           this->CTest->GetStopTime().c_str(), tzone_offset);
 
-  time_t stop_time = curl_getdate(buf, &current_time);
-  if (stop_time == -1) {
+  time_t stop_time_t = curl_getdate(buf, &current_time);
+  if (stop_time_t == -1) {
     return timeout;
   }
 
+  auto stop_time = std::chrono::system_clock::from_time_t(stop_time_t);
+
   // the stop time refers to the next day
   if (this->CTest->NextDayStopTime) {
-    stop_time += 24 * 60 * 60;
+    stop_time += std::chrono::hours(24);
   }
-  int stop_timeout =
-    static_cast<int>(stop_time - current_time) % (24 * 60 * 60);
+  auto stop_timeout =
+    (stop_time - std::chrono::system_clock::from_time_t(current_time)) %
+    std::chrono::hours(24);
   this->CTest->LastStopTimeout = stop_timeout;
 
-  if (stop_timeout <= 0 || stop_timeout > this->CTest->LastStopTimeout) {
+  if (stop_timeout <= std::chrono::duration<double>::zero() ||
+      stop_timeout > this->CTest->LastStopTimeout) {
     cmCTestLog(this->CTest, ERROR_MESSAGE, "The stop time has been passed. "
                                            "Stopping all tests."
                  << std::endl);
     this->StopTimePassed = true;
-    return 0;
+    return std::chrono::duration<double>::zero();
   }
-  return timeout == 0 ? stop_timeout
-                      : (timeout < stop_timeout ? timeout : stop_timeout);
+  return timeout == std::chrono::duration<double>::zero()
+    ? stop_timeout
+    : (timeout < stop_timeout ? timeout : stop_timeout);
 }
 
-bool cmCTestRunTest::ForkProcess(double testTimeOut, bool explicitTimeout,
+bool cmCTestRunTest::ForkProcess(std::chrono::duration<double> testTimeOut,
+                                 bool explicitTimeout,
                                  std::vector<std::string>* environment)
 {
   this->TestProcess = new cmProcess;
@@ -660,26 +685,37 @@ bool cmCTestRunTest::ForkProcess(double testTimeOut, bool explicitTimeout,
   this->TestProcess->SetCommandArguments(this->Arguments);
 
   // determine how much time we have
-  double timeout = this->CTest->GetRemainingTimeAllowed() - 120;
-  if (this->CTest->GetTimeOut() > 0 && this->CTest->GetTimeOut() < timeout) {
+  std::chrono::duration<double> timeout =
+    std::min<std::chrono::duration<double>>(
+      this->CTest->GetRemainingTimeAllowed(), std::chrono::minutes(2));
+  if (this->CTest->GetTimeOut() > std::chrono::duration<double>::zero() &&
+      this->CTest->GetTimeOut() < timeout) {
     timeout = this->CTest->GetTimeOut();
   }
-  if (testTimeOut > 0 &&
+  if (testTimeOut > std::chrono::duration<double>::zero() &&
       testTimeOut < this->CTest->GetRemainingTimeAllowed()) {
     timeout = testTimeOut;
   }
   // always have at least 1 second if we got to here
-  if (timeout <= 0) {
-    timeout = 1;
+  if (timeout <= std::chrono::duration<double>::zero()) {
+    timeout = std::chrono::seconds(1);
   }
   // handle timeout explicitly set to 0
-  if (testTimeOut == 0 && explicitTimeout) {
-    timeout = 0;
-  }
-  cmCTestOptionalLog(this->CTest, HANDLER_VERBOSE_OUTPUT, this->Index
-                       << ": "
-                       << "Test timeout computed to be: " << timeout << "\n",
-                     this->TestHandler->GetQuiet());
+  if (testTimeOut == std::chrono::duration<double>::zero() &&
+      explicitTimeout) {
+    timeout = std::chrono::duration<double>::zero();
+  }
+  cmCTestOptionalLog(
+    this->CTest, HANDLER_VERBOSE_OUTPUT, this->Index
+      << ": "
+      << "Test timeout computed to be: "
+      << (timeout == std::chrono::duration<double>::max()
+            ? std::string("infinite")
+            : std::to_string(
+                std::chrono::duration_cast<std::chrono::seconds>(timeout)
+                  .count()))
+      << "\n",
+    this->TestHandler->GetQuiet());
 
   this->TestProcess->SetTimeout(timeout);
 
diff --git a/Source/CTest/cmCTestRunTest.h b/Source/CTest/cmCTestRunTest.h
index d3bb229..cd380ca 100644
--- a/Source/CTest/cmCTestRunTest.h
+++ b/Source/CTest/cmCTestRunTest.h
@@ -5,6 +5,7 @@
 
 #include "cmConfigure.h" // IWYU pragma: keep
 
+#include <chrono>
 #include <set>
 #include <stddef.h>
 #include <string>
@@ -78,8 +79,9 @@ private:
   void DartProcessing();
   void ExeNotFound(std::string exe);
   // Figures out a final timeout which is min(STOP_TIME, NOW+TIMEOUT)
-  double ResolveTimeout();
-  bool ForkProcess(double testTimeOut, bool explicitTimeout,
+  std::chrono::duration<double> ResolveTimeout();
+  bool ForkProcess(std::chrono::duration<double> testTimeOut,
+                   bool explicitTimeout,
                    std::vector<std::string>* environment);
   void WriteLogOutputTop(size_t completed, size_t total);
   // Run post processing of the process output for MemCheck
diff --git a/Source/CTest/cmCTestScriptHandler.cxx b/Source/CTest/cmCTestScriptHandler.cxx
index d2ad8c5..922f5c7 100644
--- a/Source/CTest/cmCTestScriptHandler.cxx
+++ b/Source/CTest/cmCTestScriptHandler.cxx
@@ -1,5 +1,12 @@
 /* Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
    file Copyright.txt or https://cmake.org/licensing for details.  */
+
+#ifdef _WIN32
+/* windows.h defines min() and max() macros, unless told to otherwise. This
+ * interferes with std::min() and std::max() at the very least. */
+#define NOMINMAX
+#endif
+
 #include "cmCTestScriptHandler.h"
 
 #include "cmsys/Directory.hxx"
@@ -960,21 +967,21 @@ bool cmCTestScriptHandler::TryToRemoveBinaryDirectoryOnce(
   return cmSystemTools::RemoveADirectory(directoryPath);
 }
 
-double cmCTestScriptHandler::GetRemainingTimeAllowed()
+std::chrono::duration<double> cmCTestScriptHandler::GetRemainingTimeAllowed()
 {
   if (!this->Makefile) {
-    return 1.0e7;
+    return std::chrono::duration<double>::max();
   }
 
   const char* timelimitS = this->Makefile->GetDefinition("CTEST_TIME_LIMIT");
 
   if (!timelimitS) {
-    return 1.0e7;
+    return std::chrono::duration<double>::max();
   }
 
   auto timelimit = std::chrono::duration<double>(atof(timelimitS));
 
   auto duration = std::chrono::duration_cast<std::chrono::duration<double>>(
     std::chrono::steady_clock::now() - this->ScriptStartTime);
-  return (timelimit - duration).count();
+  return (timelimit - duration);
 }
diff --git a/Source/CTest/cmCTestScriptHandler.h b/Source/CTest/cmCTestScriptHandler.h
index 2090d04..9b7fa75 100644
--- a/Source/CTest/cmCTestScriptHandler.h
+++ b/Source/CTest/cmCTestScriptHandler.h
@@ -94,9 +94,9 @@ public:
   /**
    * Return the time remaianing that the script is allowed to run in
    * seconds if the user has set the variable CTEST_TIME_LIMIT. If that has
-   * not been set it returns 1e7 seconds
+   * not been set it returns a very large value.
    */
-  double GetRemainingTimeAllowed();
+  std::chrono::duration<double> GetRemainingTimeAllowed();
 
   cmCTestScriptHandler();
   ~cmCTestScriptHandler() override;
diff --git a/Source/CTest/cmCTestTestCommand.cxx b/Source/CTest/cmCTestTestCommand.cxx
index febd39e..232bd58 100644
--- a/Source/CTest/cmCTestTestCommand.cxx
+++ b/Source/CTest/cmCTestTestCommand.cxx
@@ -7,6 +7,7 @@
 #include "cmMakefile.h"
 #include "cmSystemTools.h"
 
+#include <chrono>
 #include <sstream>
 #include <stdlib.h>
 #include <vector>
@@ -36,14 +37,14 @@ cmCTestGenericHandler* cmCTestTestCommand::InitializeHandler()
   const char* ctestTimeout =
     this->Makefile->GetDefinition("CTEST_TEST_TIMEOUT");
 
-  double timeout;
+  std::chrono::duration<double> timeout;
   if (ctestTimeout) {
-    timeout = atof(ctestTimeout);
+    timeout = std::chrono::duration<double>(atof(ctestTimeout));
   } else {
     timeout = this->CTest->GetTimeOut();
-    if (timeout <= 0) {
+    if (timeout <= std::chrono::duration<double>::zero()) {
       // By default use timeout of 10 minutes
-      timeout = 600;
+      timeout = std::chrono::minutes(10);
     }
   }
   this->CTest->SetTimeOut(timeout);
diff --git a/Source/CTest/cmCTestTestHandler.cxx b/Source/CTest/cmCTestTestHandler.cxx
index 6d8180c..1e15cc5 100644
--- a/Source/CTest/cmCTestTestHandler.cxx
+++ b/Source/CTest/cmCTestTestHandler.cxx
@@ -653,7 +653,11 @@ void cmCTestTestHandler::PrintLabelOrSubprojectSummary(bool doSubProject)
     for (std::string const& l : p.Labels) {
       // only use labels found in labels
       if (labels.find(l) != labels.end()) {
-        labelTimes[l] += result.ExecutionTime * result.Properties->Processors;
+        labelTimes[l] +=
+          double(std::chrono::duration_cast<std::chrono::milliseconds>(
+                   result.ExecutionTime)
+                   .count()) /
+          1000.0 * result.Properties->Processors;
         ++labelCounts[l];
       }
     }
@@ -1239,7 +1243,9 @@ void cmCTestTestHandler::ProcessDirectory(std::vector<std::string>& passed,
       p.Cost = static_cast<float>(rand());
     }
 
-    if (p.Timeout == 0 && this->CTest->GetGlobalTimeout() != 0) {
+    if (p.Timeout == std::chrono::duration<double>::zero() &&
+        this->CTest->GetGlobalTimeout() !=
+          std::chrono::duration<double>::zero()) {
       p.Timeout = this->CTest->GetGlobalTimeout();
     }
 
@@ -1321,7 +1327,11 @@ void cmCTestTestHandler::GenerateDartOutput(cmXMLWriter& xml)
       xml.StartElement("NamedMeasurement");
       xml.Attribute("type", "numeric/double");
       xml.Attribute("name", "Execution Time");
-      xml.Element("Value", result.ExecutionTime);
+      xml.Element("Value",
+                  double(std::chrono::duration_cast<std::chrono::milliseconds>(
+                           result.ExecutionTime)
+                           .count()) /
+                    1000.0);
       xml.EndElement(); // NamedMeasurement
       if (!result.Reason.empty()) {
         const char* reasonType = "Pass Reason";
@@ -2142,7 +2152,7 @@ bool cmCTestTestHandler::SetTestsProperties(
             rt.FixturesRequired.insert(lval.begin(), lval.end());
           }
           if (key == "TIMEOUT") {
-            rt.Timeout = atof(val.c_str());
+            rt.Timeout = std::chrono::duration<double>(atof(val.c_str()));
             rt.ExplicitTimeout = true;
           }
           if (key == "COST") {
@@ -2222,7 +2232,8 @@ bool cmCTestTestHandler::SetTestsProperties(
                          "TIMEOUT_AFTER_MATCH expects two arguments, found "
                            << propArgs.size() << std::endl);
             } else {
-              rt.AlternateTimeout = atof(propArgs[0].c_str());
+              rt.AlternateTimeout =
+                std::chrono::duration<double>(atof(propArgs[0].c_str()));
               std::vector<std::string> lval;
               cmSystemTools::ExpandListArgument(propArgs[1], lval);
               for (std::string const& cr : lval) {
@@ -2340,7 +2351,7 @@ bool cmCTestTestHandler::AddTest(const std::vector<std::string>& args)
   test.WillFail = false;
   test.Disabled = false;
   test.RunSerial = false;
-  test.Timeout = 0;
+  test.Timeout = std::chrono::duration<double>::zero();
   test.ExplicitTimeout = false;
   test.Cost = 0;
   test.Processors = 1;
diff --git a/Source/CTest/cmCTestTestHandler.h b/Source/CTest/cmCTestTestHandler.h
index 8572e7b..19b345e 100644
--- a/Source/CTest/cmCTestTestHandler.h
+++ b/Source/CTest/cmCTestTestHandler.h
@@ -124,9 +124,9 @@ public:
     float Cost;
     int PreviousRuns;
     bool RunSerial;
-    double Timeout;
+    std::chrono::duration<double> Timeout;
     bool ExplicitTimeout;
-    double AlternateTimeout;
+    std::chrono::duration<double> AlternateTimeout;
     int Index;
     // Requested number of process slots
     int Processors;
@@ -147,7 +147,7 @@ public:
     std::string Path;
     std::string Reason;
     std::string FullCommandLine;
-    double ExecutionTime;
+    std::chrono::duration<double> ExecutionTime;
     int ReturnValue;
     int Status;
     std::string ExceptionStatus;
diff --git a/Source/CTest/cmProcess.cxx b/Source/CTest/cmProcess.cxx
index c889174..69ffb33 100644
--- a/Source/CTest/cmProcess.cxx
+++ b/Source/CTest/cmProcess.cxx
@@ -5,11 +5,21 @@
 #include "cmProcessOutput.h"
 #include <iostream>
 
+void cmsysProcess_SetTimeout(cmsysProcess* process,
+                             std::chrono::duration<double> timeout)
+{
+  cmsysProcess_SetTimeout(
+    process,
+    double(
+      std::chrono::duration_cast<std::chrono::milliseconds>(timeout).count()) /
+      1000.0);
+};
+
 cmProcess::cmProcess()
 {
   this->Process = nullptr;
-  this->Timeout = 0;
-  this->TotalTime = 0;
+  this->Timeout = std::chrono::duration<double>::zero();
+  this->TotalTime = std::chrono::duration<double>::zero();
   this->ExitValue = 0;
   this->Id = 0;
   this->StartTime = std::chrono::steady_clock::time_point();
@@ -100,10 +110,15 @@ bool cmProcess::Buffer::GetLast(std::string& line)
   return false;
 }
 
-int cmProcess::GetNextOutputLine(std::string& line, double timeout)
+int cmProcess::GetNextOutputLine(std::string& line,
+                                 std::chrono::duration<double> timeout)
 {
   cmProcessOutput processOutput(cmProcessOutput::UTF8);
   std::string strdata;
+  double waitTimeout =
+    double(
+      std::chrono::duration_cast<std::chrono::milliseconds>(timeout).count()) /
+    1000.0;
   for (;;) {
     // Look for lines already buffered.
     if (this->Output.GetLine(line)) {
@@ -113,7 +128,8 @@ int cmProcess::GetNextOutputLine(std::string& line, double timeout)
     // Check for more data from the process.
     char* data;
     int length;
-    int p = cmsysProcess_WaitForData(this->Process, &data, &length, &timeout);
+    int p =
+      cmsysProcess_WaitForData(this->Process, &data, &length, &waitTimeout);
     if (p == cmsysProcess_Pipe_Timeout) {
       return cmsysProcess_Pipe_Timeout;
     }
@@ -136,23 +152,19 @@ int cmProcess::GetNextOutputLine(std::string& line, double timeout)
   }
 
   // No more data.  Wait for process exit.
-  if (!cmsysProcess_WaitForExit(this->Process, &timeout)) {
+  if (!cmsysProcess_WaitForExit(this->Process, &waitTimeout)) {
     return cmsysProcess_Pipe_Timeout;
   }
 
   // Record exit information.
   this->ExitValue = cmsysProcess_GetExitValue(this->Process);
-  this->TotalTime =
-    static_cast<double>(std::chrono::duration_cast<std::chrono::milliseconds>(
-                          std::chrono::steady_clock::now() - this->StartTime)
-                          .count()) /
-    1000.0;
+  this->TotalTime = std::chrono::steady_clock::now() - this->StartTime;
   // Because of a processor clock scew the runtime may become slightly
   // negative. If someone changed the system clock while the process was
   // running this may be even more. Make sure not to report a negative
   // duration here.
-  if (this->TotalTime <= 0.0) {
-    this->TotalTime = 0.0;
+  if (this->TotalTime <= std::chrono::duration<double>::zero()) {
+    this->TotalTime = std::chrono::duration<double>::zero();
   }
   //  std::cerr << "Time to run: " << this->TotalTime << "\n";
   return cmsysProcess_Pipe_None;
@@ -225,7 +237,7 @@ int cmProcess::ReportStatus()
   return result;
 }
 
-void cmProcess::ChangeTimeout(double t)
+void cmProcess::ChangeTimeout(std::chrono::duration<double> t)
 {
   this->Timeout = t;
   cmsysProcess_SetTimeout(this->Process, this->Timeout);
diff --git a/Source/CTest/cmProcess.h b/Source/CTest/cmProcess.h
index ddd69b6..cbb611d 100644
--- a/Source/CTest/cmProcess.h
+++ b/Source/CTest/cmProcess.h
@@ -10,6 +10,13 @@
 #include <string>
 #include <vector>
 
+/*
+ * A wrapper function for cmsysProcess_SetTimeout that takes an
+ * std::chrono::duration. For convenience only.
+ */
+void cmsysProcess_SetTimeout(cmsysProcess* process,
+                             std::chrono::duration<double> timeout);
+
 /** \class cmProcess
  * \brief run a process with c++
  *
@@ -24,8 +31,8 @@ public:
   void SetCommand(const char* command);
   void SetCommandArguments(std::vector<std::string> const& arg);
   void SetWorkingDirectory(const char* dir) { this->WorkingDirectory = dir; }
-  void SetTimeout(double t) { this->Timeout = t; }
-  void ChangeTimeout(double t);
+  void SetTimeout(std::chrono::duration<double> t) { this->Timeout = t; }
+  void ChangeTimeout(std::chrono::duration<double> t);
   void ResetStartTime();
   // Return true if the process starts
   bool StartProcess();
@@ -37,7 +44,7 @@ public:
   int GetId() { return this->Id; }
   void SetId(int id) { this->Id = id; }
   int GetExitValue() { return this->ExitValue; }
-  double GetTotalTime() { return this->TotalTime; }
+  std::chrono::duration<double> GetTotalTime() { return this->TotalTime; }
   int GetExitException();
   std::string GetExitExceptionString();
   /**
@@ -47,12 +54,13 @@ public:
    *   cmsysProcess_Pipe_STDOUT  = Line came from stdout or stderr
    *   cmsysProcess_Pipe_Timeout = Timeout expired while waiting
    */
-  int GetNextOutputLine(std::string& line, double timeout);
+  int GetNextOutputLine(std::string& line,
+                        std::chrono::duration<double> timeout);
 
 private:
-  double Timeout;
+  std::chrono::duration<double> Timeout;
   std::chrono::steady_clock::time_point StartTime;
-  double TotalTime;
+  std::chrono::duration<double> TotalTime;
   cmsysProcess* Process;
   class Buffer : public std::vector<char>
   {
diff --git a/Source/cmCTest.cxx b/Source/cmCTest.cxx
index d358e3d..a4ca301 100644
--- a/Source/cmCTest.cxx
+++ b/Source/cmCTest.cxx
@@ -1,5 +1,11 @@
 /* Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
    file Copyright.txt or https://cmake.org/licensing for details.  */
+#ifdef _WIN32
+/* windows.h defines min() and max() macros by default. This interferes with
+ * C++ functions names.
+ */
+#define NOMINMAX
+#endif
 #include "cmCTest.h"
 
 #include "cm_curl.h"
@@ -44,6 +50,7 @@
 #include "cmGeneratedFileStream.h"
 #include "cmGlobalGenerator.h"
 #include "cmMakefile.h"
+#include "cmProcess.h"
 #include "cmProcessOutput.h"
 #include "cmState.h"
 #include "cmStateSnapshot.h"
@@ -278,9 +285,9 @@ cmCTest::cmCTest()
   this->TestModel = cmCTest::EXPERIMENTAL;
   this->MaxTestNameWidth = 30;
   this->InteractiveDebugMode = true;
-  this->TimeOut = 0;
-  this->GlobalTimeout = 0;
-  this->LastStopTimeout = 24 * 60 * 60;
+  this->TimeOut = std::chrono::duration<double>::zero();
+  this->GlobalTimeout = std::chrono::duration<double>::zero();
+  this->LastStopTimeout = std::chrono::hours(24);
   this->CompressXMLFiles = false;
   this->ScheduleType.clear();
   this->StopTime.clear();
@@ -678,7 +685,8 @@ bool cmCTest::UpdateCTestConfiguration()
     this->BinaryDir = this->GetCTestConfiguration("BuildDirectory");
     cmSystemTools::ChangeDirectory(this->BinaryDir);
   }
-  this->TimeOut = atoi(this->GetCTestConfiguration("TimeOut").c_str());
+  this->TimeOut =
+    std::chrono::seconds(atoi(this->GetCTestConfiguration("TimeOut").c_str()));
   std::string const& testLoad = this->GetCTestConfiguration("TestLoad");
   if (!testLoad.empty()) {
     unsigned long load;
@@ -836,7 +844,8 @@ int cmCTest::ProcessSteps()
   for (Part p = PartStart; notest && p != PartCount; p = Part(p + 1)) {
     notest = !this->Parts[p];
   }
-  if (this->Parts[PartUpdate] && (this->GetRemainingTimeAllowed() - 120 > 0)) {
+  if (this->Parts[PartUpdate] &&
+      (this->GetRemainingTimeAllowed() > std::chrono::minutes(2))) {
     cmCTestGenericHandler* uphandler = this->GetHandler("update");
     uphandler->SetPersistentOption(
       "SourceDirectory",
@@ -850,33 +859,34 @@ int cmCTest::ProcessSteps()
     return 0;
   }
   if (this->Parts[PartConfigure] &&
-      (this->GetRemainingTimeAllowed() - 120 > 0)) {
+      (this->GetRemainingTimeAllowed() > std::chrono::minutes(2))) {
     if (this->GetHandler("configure")->ProcessHandler() < 0) {
       res |= cmCTest::CONFIGURE_ERRORS;
     }
   }
-  if (this->Parts[PartBuild] && (this->GetRemainingTimeAllowed() - 120 > 0)) {
+  if (this->Parts[PartBuild] &&
+      (this->GetRemainingTimeAllowed() > std::chrono::minutes(2))) {
     this->UpdateCTestConfiguration();
     if (this->GetHandler("build")->ProcessHandler() < 0) {
       res |= cmCTest::BUILD_ERRORS;
     }
   }
   if ((this->Parts[PartTest] || notest) &&
-      (this->GetRemainingTimeAllowed() - 120 > 0)) {
+      (this->GetRemainingTimeAllowed() > std::chrono::minutes(2))) {
     this->UpdateCTestConfiguration();
     if (this->GetHandler("test")->ProcessHandler() < 0) {
       res |= cmCTest::TEST_ERRORS;
     }
   }
   if (this->Parts[PartCoverage] &&
-      (this->GetRemainingTimeAllowed() - 120 > 0)) {
+      (this->GetRemainingTimeAllowed() > std::chrono::minutes(2))) {
     this->UpdateCTestConfiguration();
     if (this->GetHandler("coverage")->ProcessHandler() < 0) {
       res |= cmCTest::COVERAGE_ERRORS;
     }
   }
   if (this->Parts[PartMemCheck] &&
-      (this->GetRemainingTimeAllowed() - 120 > 0)) {
+      (this->GetRemainingTimeAllowed() > std::chrono::minutes(2))) {
     this->UpdateCTestConfiguration();
     if (this->GetHandler("memcheck")->ProcessHandler() < 0) {
       res |= cmCTest::MEMORY_ERRORS;
@@ -955,7 +965,8 @@ int cmCTest::GetTestModelFromString(const char* str)
 //######################################################################
 
 int cmCTest::RunMakeCommand(const char* command, std::string& output,
-                            int* retVal, const char* dir, int timeout,
+                            int* retVal, const char* dir,
+                            std::chrono::duration<double> timeout,
                             std::ostream& ofs, Encoding encoding)
 {
   // First generate the command and arguments
@@ -1071,26 +1082,37 @@ int cmCTest::RunMakeCommand(const char* command, std::string& output,
 //######################################################################
 
 int cmCTest::RunTest(std::vector<const char*> argv, std::string* output,
-                     int* retVal, std::ostream* log, double testTimeOut,
+                     int* retVal, std::ostream* log,
+                     std::chrono::duration<double> testTimeOut,
                      std::vector<std::string>* environment, Encoding encoding)
 {
   bool modifyEnv = (environment && !environment->empty());
 
   // determine how much time we have
-  double timeout = this->GetRemainingTimeAllowed() - 120;
-  if (this->TimeOut > 0 && this->TimeOut < timeout) {
+  std::chrono::duration<double> timeout =
+    std::min<std::chrono::duration<double>>(this->GetRemainingTimeAllowed(),
+                                            std::chrono::minutes(2));
+  if (this->TimeOut > std::chrono::duration<double>::zero() &&
+      this->TimeOut < timeout) {
     timeout = this->TimeOut;
   }
-  if (testTimeOut > 0 && testTimeOut < this->GetRemainingTimeAllowed()) {
+  if (testTimeOut > std::chrono::duration<double>::zero() &&
+      testTimeOut < this->GetRemainingTimeAllowed()) {
     timeout = testTimeOut;
   }
 
   // always have at least 1 second if we got to here
-  if (timeout <= 0) {
-    timeout = 1;
+  if (timeout <= std::chrono::duration<double>::zero()) {
+    timeout = std::chrono::seconds(1);
   }
-  cmCTestLog(this, HANDLER_VERBOSE_OUTPUT,
-             "Test timeout computed to be: " << timeout << "\n");
+  cmCTestLog(
+    this, HANDLER_VERBOSE_OUTPUT, "Test timeout computed to be: "
+      << (timeout == std::chrono::duration<double>::max()
+            ? std::string("infinite")
+            : std::to_string(
+                std::chrono::duration_cast<std::chrono::seconds>(timeout)
+                  .count()))
+      << "\n");
   if (cmSystemTools::SameFile(argv[0], cmSystemTools::GetCTestCommand()) &&
       !this->ForceNewCTestProcess) {
     cmCTest inst;
@@ -1107,10 +1129,12 @@ int cmCTest::RunTest(std::vector<const char*> argv, std::string* output,
         // make sure we pass the timeout in for any build and test
         // invocations. Since --build-generator is required this is a
         // good place to check for it, and to add the arguments in
-        if (strcmp(i, "--build-generator") == 0 && timeout > 0) {
+        if (strcmp(i, "--build-generator") == 0 &&
+            timeout > std::chrono::duration<double>::zero()) {
           args.push_back("--test-timeout");
           std::ostringstream msg;
-          msg << timeout;
+          msg << std::chrono::duration_cast<std::chrono::seconds>(timeout)
+                   .count();
           args.push_back(msg.str());
         }
         args.push_back(i);
@@ -1757,7 +1781,7 @@ bool cmCTest::HandleCommandLineArguments(size_t& i,
 
   if (this->CheckArgument(arg, "--timeout") && i < args.size() - 1) {
     i++;
-    double timeout = atof(args[i].c_str());
+    auto timeout = std::chrono::duration<double>(atof(args[i].c_str()));
     this->GlobalTimeout = timeout;
   }
 
@@ -2564,7 +2588,9 @@ bool cmCTest::SetCTestConfigurationFromCMakeVariable(
 
 bool cmCTest::RunCommand(std::vector<std::string> const& args,
                          std::string* stdOut, std::string* stdErr, int* retVal,
-                         const char* dir, double timeout, Encoding encoding)
+                         const char* dir,
+                         std::chrono::duration<double> timeout,
+                         Encoding encoding)
 {
   std::vector<const char*> argv;
   argv.reserve(args.size() + 1);
@@ -2775,10 +2801,10 @@ void cmCTest::Log(int logType, const char* file, int line, const char* msg,
   }
 }
 
-double cmCTest::GetRemainingTimeAllowed()
+std::chrono::duration<double> cmCTest::GetRemainingTimeAllowed()
 {
   if (!this->GetHandler("script")) {
-    return 1.0e7;
+    return std::chrono::duration<double>::max();
   }
 
   cmCTestScriptHandler* ch =
diff --git a/Source/cmCTest.h b/Source/cmCTest.h
index a2d6fc3..ba94866 100644
--- a/Source/cmCTest.h
+++ b/Source/cmCTest.h
@@ -7,6 +7,7 @@
 
 #include "cmProcessOutput.h"
 #include "cmsys/String.hxx"
+#include <chrono>
 #include <map>
 #include <set>
 #include <sstream>
@@ -139,10 +140,13 @@ public:
 
   /** what is the configuraiton type, e.g. Debug, Release etc. */
   std::string const& GetConfigType();
-  double GetTimeOut() { return this->TimeOut; }
-  void SetTimeOut(double t) { this->TimeOut = t; }
+  std::chrono::duration<double> GetTimeOut() { return this->TimeOut; }
+  void SetTimeOut(std::chrono::duration<double> t) { this->TimeOut = t; }
 
-  double GetGlobalTimeout() { return this->GlobalTimeout; }
+  std::chrono::duration<double> GetGlobalTimeout()
+  {
+    return this->GlobalTimeout;
+  }
 
   /** how many test to run at the same time */
   int GetParallelLevel() { return this->ParallelLevel; }
@@ -200,9 +204,9 @@ public:
   /**
    * Return the time remaining that the script is allowed to run in
    * seconds if the user has set the variable CTEST_TIME_LIMIT. If that has
-   * not been set it returns 1e7 seconds
+   * not been set it returns a very large duration.
    */
-  double GetRemainingTimeAllowed();
+  std::chrono::duration<double> GetRemainingTimeAllowed();
 
   /**
    * Open file in the output directory and set the stream
@@ -248,7 +252,9 @@ public:
    */
   bool RunCommand(std::vector<std::string> const& args, std::string* stdOut,
                   std::string* stdErr, int* retVal = nullptr,
-                  const char* dir = nullptr, double timeout = 0.0,
+                  const char* dir = nullptr,
+                  std::chrono::duration<double> timeout =
+                    std::chrono::duration<double>::zero(),
                   Encoding encoding = cmProcessOutput::Auto);
 
   /**
@@ -268,7 +274,8 @@ public:
    * and retVal is return value or exception.
    */
   int RunMakeCommand(const char* command, std::string& output, int* retVal,
-                     const char* dir, int timeout, std::ostream& ofs,
+                     const char* dir, std::chrono::duration<double> timeout,
+                     std::ostream& ofs,
                      Encoding encoding = cmProcessOutput::Auto);
 
   /** Return the current tag */
@@ -315,7 +322,7 @@ public:
    * environment variables are restored to their previous values.
    */
   int RunTest(std::vector<const char*> args, std::string* output, int* retVal,
-              std::ostream* logfile, double testTimeOut,
+              std::ostream* logfile, std::chrono::duration<double> testTimeOut,
               std::vector<std::string>* environment,
               Encoding encoding = cmProcessOutput::Auto);
 
@@ -503,11 +510,11 @@ private:
   int TestModel;
   std::string SpecificTrack;
 
-  double TimeOut;
+  std::chrono::duration<double> TimeOut;
 
-  double GlobalTimeout;
+  std::chrono::duration<double> GlobalTimeout;
 
-  int LastStopTimeout;
+  std::chrono::duration<double> LastStopTimeout;
 
   int MaxTestNameWidth;