(svn r2810) Threads may now return information when they terminate using a void*.

Also add the new files to the MSVC project files.

thread.c

@@ -6,7 +6,7 @@
 
 #if defined(__AMIGA__) || defined(__MORPHOS__)
 Thread* OTTDCreateThread(ThreadFunc function, void* arg) { return NULL; }
-void OTTDJoinThread(Thread*) {}
+void* OTTDJoinThread(Thread*) { return NULL; }
 
 
 #elif defined(__OS2__)
@@ -17,15 +17,26 @@ void OTTDJoinThread(Thread*) {}
 
 struct Thread {
 	TID thread;
+	ThradFunc func;
+	void* arg;
+	void* ret;
 };
 
+static void Proxy(void* arg)
+{
+	Thread* t = arg;
+	t->ret = t->func(t->arg);
+}
+
 Thread* OTTDCreateThread(ThreadFunc function, void* arg)
 {
 	Thread* t = malloc(sizeof(*t));
 
 	if (t == NULL) return NULL;
 
-	t->thread = _beginthread(function, NULL, 32768, arg);
+	t->func = function;
+	t->arg  = arg;
+	t->thread = _beginthread(Proxy, NULL, 32768, t);
 	if (t->thread != -1) {
 		return t;
 	} else {
@@ -34,12 +45,16 @@ Thread* OTTDCreateThread(ThreadFunc function, void* arg)
 	}
 }
 
-void OTTDJoinThread(Thread* t)
+void* OTTDJoinThread(Thread* t)
 {
-	if (t == NULL) return;
+	void* ret;
+
+	if (t == NULL) return NULL;
 
 	DosWaitThread(&t->thread, DCWW_WAIT);
+	ret = t->ret;
 	free(t);
+	return ret;
 }
 
 
@@ -57,7 +72,7 @@ Thread* OTTDCreateThread(ThreadFunc function, void* arg)
 
 	if (t == NULL) return NULL;
 
-	if (pthread_create(&t->thread, NULL, (void* (*)(void*))function, arg) == 0) {
+	if (pthread_create(&t->thread, NULL, function, arg) == 0) {
 		return t;
 	} else {
 		free(t);
@@ -65,12 +80,15 @@ Thread* OTTDCreateThread(ThreadFunc function, void* arg)
 	}
 }
 
-void OTTDJoinThread(Thread* t)
+void* OTTDJoinThread(Thread* t)
 {
-	if (t == NULL) return;
+	void* ret;
 
-	pthread_join(t->thread, NULL);
+	if (t == NULL) return NULL;
+
+	pthread_join(t->thread, &ret);
 	free(t);
+	return ret;
 }
 
 
@@ -80,8 +98,18 @@ void OTTDJoinThread(Thread* t)
 
 struct Thread {
 	HANDLE thread;
+	ThradFunc func;
+	void* arg;
+	void* ret;
 };
 
+static DWORD WINAPI Proxy(LPVOID arg)
+{
+	Thread* t = arg;
+	t->ret = t->func(t->arg);
+	return 0;
+}
+
 Thread* OTTDCreateThread(ThreadFunc function, void* arg)
 {
 	Thread* t = malloc(sizeof(*t));
@@ -89,9 +117,9 @@ Thread* OTTDCreateThread(ThreadFunc function, void* arg)
 
 	if (t == NULL) return NULL;
 
-	t->thread = CreateThread(
-		NULL, 0, (LPTHREAD_START_ROUTINE)function, arg, 0, &dwThreadId
-	);
+	t->func = function;
+	t->arg  = arg;
+	t->thread = CreateThread(NULL, 0, Proxy, arg, 0, &dwThreadId);
 
 	if (t->thread != NULL) {
 		return t;
@@ -101,12 +129,16 @@ Thread* OTTDCreateThread(ThreadFunc function, void* arg)
 	}
 }
 
-void OTTDJoinThread(Thread* t)
+void* OTTDJoinThread(Thread* t)
 {
-	if (t == NULL) return;
+	void* ret;
+
+	if (t == NULL) return NULL;
 
 	WaitForSingleObject(t->thread, INFINITE);
 	CloseHandle(t->thread);
+	ret = t->ret;
 	free(t);
+	return ret;
 }
 #endif