[dart:io] Adds ProcessInfo.{max,current}Rss. Adds OS::MaxRSS on Fuchsia.

runtime/bin/process_macos.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #if !defined(DART_IO_DISABLED)
 
 #include "platform/globals.h"
 #if defined(HOST_OS_MACOS)
 
 #include "bin/process.h"
 
 #if !HOST_OS_IOS
 #include <crt_externs.h>  // NOLINT
 #endif
 #include <errno.h>   // NOLINT
 #include <fcntl.h>   // NOLINT
+#include <mach/mach.h>  // NOLINT
 #include <poll.h>    // NOLINT
 #include <signal.h>  // NOLINT
 #include <stdio.h>   // NOLINT
 #include <stdlib.h>  // NOLINT
 #include <string.h>  // NOLINT
 #include <unistd.h>  // NOLINT
 
 #include "bin/dartutils.h"
 #include "bin/fdutils.h"
 #include "bin/lockers.h"
@@ skipping 934 matching lines @@
 void Process::TerminateExitCodeHandler() {
   ExitCodeHandler::TerminateExitCodeThread();
 }
 
 
 intptr_t Process::CurrentProcessId() {
   return static_cast<intptr_t>(getpid());
 }
 
 
+int64_t Process::CurrentRSS() {
+  struct mach_task_basic_info info;
+  mach_msg_type_number_t infoCount = MACH_TASK_BASIC_INFO_COUNT;
+  kern_return_t result =
+      task_info(mach_task_self(), MACH_TASK_BASIC_INFO,
+                reinterpret_cast<task_info_t>(&info), &infoCount);
+  if (result != KERN_SUCCESS) {
+    return -1;
+  }
+  return info.resident_size;
+}
+
+
+int64_t Process::MaxRSS() {
+  struct rusage usage;
+  usage.ru_maxrss = 0;
+  int r = getrusage(RUSAGE_SELF, &usage);
+  if (r < 0) {
+    return -1;
+  }
+  return usage.ru_maxrss;
+}
+
+
 static Mutex* signal_mutex = new Mutex();
 static SignalInfo* signal_handlers = NULL;
 static const int kSignalsCount = 7;
 static const int kSignals[kSignalsCount] = {
     SIGHUP, SIGINT, SIGTERM, SIGUSR1, SIGUSR2, SIGWINCH,
     SIGQUIT  // Allow VMService to listen on SIGQUIT.
 };
 
 
 SignalInfo::~SignalInfo() {
@@ skipping 105 matching lines @@
     VOID_NO_RETRY_EXPECTED(sigaction(signal, &act, NULL));
   }
 }
 
 }  // namespace bin
 }  // namespace dart
 
 #endif  // defined(HOST_OS_MACOS)
 
 #endif  // !defined(DART_IO_DISABLED)