From cd44dc59cdfc39534aef4d417e9f3c412e3be139 Mon Sep 17 00:00:00 2001
From: Simon Hausmann <simon.hausmann@nokia.com>
Date: Fri, 3 Feb 2012 09:55:33 +0100
Subject: Imported WebKit commit fce473cb4d55aa9fe9d0b0322a2fffecb731b961
 (http://svn.webkit.org/repository/webkit/trunk@106560)

---
 Source/JavaScriptCore/wtf/ParallelJobsGeneric.cpp | 48 +++--------------------
 1 file changed, 5 insertions(+), 43 deletions(-)

(limited to 'Source/JavaScriptCore/wtf/ParallelJobsGeneric.cpp')

diff --git a/Source/JavaScriptCore/wtf/ParallelJobsGeneric.cpp b/Source/JavaScriptCore/wtf/ParallelJobsGeneric.cpp
index b6207dc88..fd5b1f847 100644
--- a/Source/JavaScriptCore/wtf/ParallelJobsGeneric.cpp
+++ b/Source/JavaScriptCore/wtf/ParallelJobsGeneric.cpp
@@ -30,34 +30,22 @@
 #if ENABLE(THREADING_GENERIC)
 
 #include "ParallelJobs.h"
-#include "UnusedParam.h"
-
-#if OS(DARWIN) || OS(OPENBSD) || OS(NETBSD)
-#include <sys/sysctl.h>
-#include <sys/types.h>
-#elif OS(LINUX) || OS(AIX) || OS(SOLARIS)
-#include <unistd.h>
-#elif OS(WINDOWS)
-#include <windows.h>
-#endif
+#include <wtf/NumberOfCores.h>
 
 namespace WTF {
 
 Vector< RefPtr<ParallelEnvironment::ThreadPrivate> >* ParallelEnvironment::s_threadPool = 0;
 
-int ParallelEnvironment::s_maxNumberOfParallelThreads = -1;
-
 ParallelEnvironment::ParallelEnvironment(ThreadFunction threadFunction, size_t sizeOfParameter, int requestedJobNumber) :
     m_threadFunction(threadFunction),
     m_sizeOfParameter(sizeOfParameter)
 {
     ASSERT_ARG(requestedJobNumber, requestedJobNumber >= 1);
 
-    if (s_maxNumberOfParallelThreads == -1)
-        determineMaxNumberOfParallelThreads();
+    int maxNumberOfCores = numberOfProcessorCores();
 
-    if (!requestedJobNumber || requestedJobNumber > s_maxNumberOfParallelThreads)
-        requestedJobNumber = static_cast<unsigned>(s_maxNumberOfParallelThreads);
+    if (!requestedJobNumber || requestedJobNumber > maxNumberOfCores)
+        requestedJobNumber = static_cast<unsigned>(maxNumberOfCores);
 
     if (!s_threadPool)
         s_threadPool = new Vector< RefPtr<ThreadPrivate> >();
@@ -65,7 +53,7 @@ ParallelEnvironment::ParallelEnvironment(ThreadFunction threadFunction, size_t s
     // The main thread should be also a worker.
     int maxNumberOfNewThreads = requestedJobNumber - 1;
 
-    for (int i = 0; i < s_maxNumberOfParallelThreads && m_threads.size() < static_cast<unsigned>(maxNumberOfNewThreads); ++i) {
+    for (int i = 0; i < maxNumberOfCores && m_threads.size() < static_cast<unsigned>(maxNumberOfNewThreads); ++i) {
         if (s_threadPool->size() < static_cast<unsigned>(i) + 1U)
             s_threadPool->append(ThreadPrivate::create());
 
@@ -93,32 +81,6 @@ void ParallelEnvironment::execute(void* parameters)
         m_threads[i]->waitForFinish();
 }
 
-void ParallelEnvironment::determineMaxNumberOfParallelThreads()
-{
-    const int defaultIfUnavailable = 2;
-#if OS(DARWIN) || OS(OPENBSD) || OS(NETBSD)
-    unsigned result;
-    size_t length = sizeof(result);
-    int name[] = {
-        CTL_HW,
-        HW_NCPU
-    };
-    int sysctlResult = sysctl(name, sizeof(name) / sizeof(int), &result, &length, 0, 0);
-    s_maxNumberOfParallelThreads = sysctlResult < 0 ? defaultIfUnavailable : result;
-#elif OS(LINUX) || OS(AIX) || OS(SOLARIS)
-    long sysconfResult = sysconf(_SC_NPROCESSORS_ONLN);
-    s_maxNumberOfParallelThreads = sysconfResult < 0 ? defaultIfUnavailable : static_cast<int>(sysconfResult);
-#elif OS(WINDOWS)
-    UNUSED_PARAM(defaultIfUnavailable);
-
-    SYSTEM_INFO sysInfo;
-    GetSystemInfo(&sysInfo);
-    s_maxNumberOfParallelThreads = sysInfo.dwNumberOfProcessors;
-#else
-    s_maxNumberOfParallelThreads = defaultIfUnavailable;
-#endif
-}
-
 bool ParallelEnvironment::ThreadPrivate::tryLockFor(ParallelEnvironment* parent)
 {
     bool locked = m_mutex.tryLock();
-- 
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