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Use multiple worker threads for Process tasks.

This commit is contained in:
Gunnar Beutner 2013-02-10 22:29:42 +01:00
parent aa2322abbb
commit 7ce98ed374
1 changed files with 37 additions and 24 deletions
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61
lib/base/process.cpp
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@ -39,22 +39,38 @@ Process::Process(const vector<String>& arguments, const Dictionary::Ptr& extraEn
assert(Application::IsMainThread());
if (!m_ThreadCreated) {
int childTaskFd;
#ifdef _MSC_VER
childTaskFd = 0;
#else /* _MSC_VER */
#ifndef _MSC_VER
int fds[2];
if (pipe(fds) < 0)
BOOST_THROW_EXCEPTION(PosixException("pipe() failed.", errno));
childTaskFd = fds[0];
m_TaskFd = fds[1];
#endif /* _MSC_VER */
thread t(&Process::WorkerThreadProc, childTaskFd);
t.detach();
for (int i = 0; i < thread::hardware_concurrency(); i++) {
int childTaskFd;
#ifdef _MSC_VER
childTaskFd = 0;
#else /* _MSC_VER */
childTaskFd = dup(fds[0]);
if (childTaskFd < 0)
BOOST_THROW_EXCEPTION(PosixException("dup() failed.", errno));
int flags;
flags = fcntl(childTaskFd, F_GETFL, 0);
if (flags < 0)
BOOST_THROW_EXCEPTION(PosixException("fcntl failed", errno));
if (fcntl(childTaskFd, F_SETFL, flags | O_NONBLOCK) < 0)
BOOST_THROW_EXCEPTION(PosixException("fcntl failed", errno));
#endif /* _MSC_VER */
thread t(&Process::WorkerThreadProc, childTaskFd);
t.detach();
}
m_ThreadCreated = true;
}
@ -166,28 +182,25 @@ void Process::WorkerThreadProc(int taskFd)
#ifndef _MSC_VER
if (FD_ISSET(taskFd, &readfds)) {
#endif /* _MSC_VER */
/* Figure out how many tasks we'd ideally want. */
int tasknum = MaxTasksPerThread - tasks.size();
#ifndef _MSC_VER
/* Read one byte for every task we take from the pending tasks list. */
char buffer[MaxTasksPerThread];
tasknum = read(taskFd, &buffer, tasknum);
if (tasknum < 0)
BOOST_THROW_EXCEPTION(PosixException("read() failed.", errno));
assert(tasknum >= 1);
#endif /* _MSC_VER */
for (int i = 0; i < tasknum; i++) {
while (tasks.size() < MaxTasksPerThread) {
Process::Ptr task;
{
boost::mutex::scoped_lock lock(m_Mutex);
if (m_Tasks.empty())
break;
/* Read one byte for every task we take from the pending tasks list. */
char buffer;
int rc = read(taskFd, &buffer, sizeof(buffer));
if (rc < 0) {
if (errno == EAGAIN)
break; /* Someone else was faster and took our task. */
BOOST_THROW_EXCEPTION(PosixException("read() failed.", errno));
}
assert(!m_Tasks.empty());
task = m_Tasks.front();
m_Tasks.pop_front();