From 36774013196d20bb192e70ad94c85ee4e424d380 Mon Sep 17 00:00:00 2001
From: Alexandre Janniaux <alexandre.janniaux@gmail.com>
Date: Fri, 4 Jan 2013 18:19:44 +0100
Subject: [PATCH] Add posix thread support.

Former-commit-id: fcab7f0b38965e4435abe683d9edc7de27df2621
---
 src/Nazara/Core/Posix/ThreadImpl.cpp | 80 ++++++++++++++++++++++++++++
 src/Nazara/Core/Posix/ThreadImpl.hpp | 35 ++++++++++++
 2 files changed, 115 insertions(+)
 create mode 100644 src/Nazara/Core/Posix/ThreadImpl.cpp
 create mode 100644 src/Nazara/Core/Posix/ThreadImpl.hpp

diff --git a/src/Nazara/Core/Posix/ThreadImpl.cpp b/src/Nazara/Core/Posix/ThreadImpl.cpp
new file mode 100644
index 000000000..d63fac4c8
--- /dev/null
+++ b/src/Nazara/Core/Posix/ThreadImpl.cpp
@@ -0,0 +1,80 @@
+// Copyright (C) 2012 Jérôme Leclercq
+// This file is part of the "Nazara Engine - Core module"
+// For conditions of distribution and use, see copyright notice in Config.hpp
+
+#include <Nazara/Core/Posix/ThreadImpl.hpp>
+#include <Nazara/Core/Error.hpp>
+#include <Nazara/Core/Functor.hpp>
+#include <process.h>
+#include <Nazara/Core/Debug.hpp>
+
+NzThreadImpl::NzThreadImpl(NzFunctor* functor)
+{
+    int error = pthread_create(&m_handle, nullptr, &NzThreadImpl::ThreadProc, functor);
+	
+	if (error != 0)
+		NazaraInternalError("Failed to create thread: " + NzGetLastSystemError());
+}
+
+void NzThreadImpl::Detach()
+{
+	// http://stackoverflow.com/questions/418742/is-it-reasonable-to-call-closehandle-on-a-thread-before-it-terminates
+	pthread_detach(&m_handle);
+}
+
+void NzThreadImpl::Join()
+{
+	pthread_join(&m_handle, nullptr);
+}
+
+unsigned int __stdcall NzThreadImpl::ThreadProc(void* userdata)
+{
+	NzFunctor* func = static_cast<NzFunctor*>(userdata);
+	func->Run();
+	delete func;
+
+	/*
+	En C++, il vaut mieux retourner depuis la fonction que de quitter le thread explicitement
+	Source : http://msdn.microsoft.com/en-us/library/windows/desktop/ms682659(v=vs.85).aspx
+	*/
+
+	return 0;
+}
+
+void NzThreadImpl::Sleep(nzUInt32 time)
+{
+    // code from SFML2 Unix SleepImpl.cpp source https://github.com/LaurentGomila/SFML/blob/master/src/SFML/System/Unix/SleepImpl.cpp
+
+    // usleep is not reliable enough (it might block the
+    // whole process instead of just the current thread)
+    // so we must use pthread_cond_timedwait instead
+
+    // this implementation is inspired from Qt
+
+    nzUint64 usecs = time.asMicroseconds();
+
+    // get the current time
+    timeval tv;
+    gettimeofday(&tv, NULL);
+
+    // construct the time limit (current time + time to wait)
+    timespec ti;
+    ti.tv_nsec = (tv.tv_usec + (usecs % 1000000)) * 1000;
+    ti.tv_sec = tv.tv_sec + (usecs / 1000000) + (ti.tv_nsec / 1000000000);
+    ti.tv_nsec %= 1000000000;
+
+    // create a mutex and thread condition
+    pthread_mutex_t mutex;
+    pthread_mutex_init(&mutex, 0);
+    pthread_cond_t condition;
+    pthread_cond_init(&condition, 0);
+
+    // wait...
+    pthread_mutex_lock(&mutex);
+    pthread_cond_timedwait(&condition, &mutex, &ti);
+    pthread_mutex_unlock(&mutex);
+
+    // destroy the mutex and condition
+    pthread_cond_destroy(&condition);
+    pthread_mutex_destroy(&mutex);
+}
diff --git a/src/Nazara/Core/Posix/ThreadImpl.hpp b/src/Nazara/Core/Posix/ThreadImpl.hpp
new file mode 100644
index 000000000..f3213ae24
--- /dev/null
+++ b/src/Nazara/Core/Posix/ThreadImpl.hpp
@@ -0,0 +1,35 @@
+// Copyright (C) 2012 Jérôme Leclercq
+// This file is part of the "Nazara Engine - Core module"
+// For conditions of distribution and use, see copyright notice in Config.hpp
+
+// Inspiré du code de la SFML par Laurent Gomila
+
+#pragma once
+
+#ifndef NAZARA_THREADIMPL_HPP
+#define NAZARA_THREADIMPL_HPP
+
+#include <Nazara/Prerequesites.hpp>
+#include <pthread.h>
+#include <unistd.h>
+#include <sys/time.h>
+
+struct NzFunctor;
+
+class NzThreadImpl
+{
+	public:
+		NzThreadImpl(NzFunctor* threadFunc);
+
+		void Detach();
+		void Join();
+
+		static void Sleep(nzUInt32 time);
+
+	private:
+		static unsigned int ThreadProc(void* userdata);
+
+		pthread_t m_handle;
+};
+
+#endif // NAZARA_THREADIMPL_HPP