From 7f6002caba3f0a6749820c2772161caf55b8d267 Mon Sep 17 00:00:00 2001
From: neonloop
Date: Fri, 7 May 2021 20:00:12 +0000
Subject: Initial commit (uqm-0.8.0)

---
 src/libs/task/tasklib.c | 139 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 139 insertions(+)
 create mode 100644 src/libs/task/tasklib.c

(limited to 'src/libs/task/tasklib.c')

diff --git a/src/libs/task/tasklib.c b/src/libs/task/tasklib.c
new file mode 100644
index 0000000..81f77af
--- /dev/null
+++ b/src/libs/task/tasklib.c
@@ -0,0 +1,139 @@
+/*
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ */
+
+/* By Michael Martin, 2002-09-21
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include "libs/tasklib.h"
+#include "libs/log.h"
+
+#define TASK_MAX 64
+
+static struct taskstruct task_array[TASK_MAX];
+
+Task
+AssignTask (ThreadFunction task_func, SDWORD stackSize, const char *name)
+{
+	int i;
+	for (i = 0; i < TASK_MAX; ++i)
+	{
+		if (!Task_SetState (task_array+i, TASK_INUSE))
+		{
+			// log_add (log_Debug, "Assigning Task #%i: %s", i+1, name);
+			Task_ClearState (task_array+i, ~TASK_INUSE);
+			task_array[i].name = name;
+			task_array[i].thread = CreateThread (task_func, task_array+i,
+					stackSize, name);
+			return task_array+i;
+		}
+	}
+	log_add (log_Error, "Task error!  Task array exhausted.  Check for thread leaks.");
+	return NULL;
+}
+
+void
+FinishTask (Task task)
+{
+	// log_add (log_Debug, "Releasing Task: %s", task->name);
+	task->thread = 0;
+	if (!Task_ClearState (task, TASK_INUSE))
+	{
+		log_add (log_Debug, "Task error!  Attempted to FinishTask '%s'... "
+				"but it was already done!", task->name);
+	}
+}
+
+/* This could probably be done better with a condition variable of some kind. */
+void
+ConcludeTask (Task task)
+{
+	Thread old = task->thread;
+	// log_add (log_Debug, "Awaiting conclusion of %s", task->name);
+	if (old)
+	{
+		Task_SetState (task, TASK_EXIT);
+		while (task->thread == old)
+		{
+			TaskSwitch ();
+		}
+	}
+}
+
+DWORD
+Task_SetState (Task task, DWORD state_mask)
+{
+	DWORD old_state;
+	LockMutex (task->state_mutex);
+	old_state = task->state;
+	task->state |= state_mask;
+	UnlockMutex (task->state_mutex);
+	old_state &= state_mask;
+	return old_state;
+}
+
+DWORD
+Task_ClearState (Task task, DWORD state_mask)
+{
+	DWORD old_state;
+	LockMutex (task->state_mutex);
+	old_state = task->state;
+	task->state &= ~state_mask;
+	UnlockMutex (task->state_mutex);
+	old_state &= state_mask;
+	return old_state;
+}
+
+DWORD
+Task_ToggleState (Task task, DWORD state_mask)
+{
+	DWORD old_state;
+	LockMutex (task->state_mutex);
+	old_state = task->state;
+	task->state ^= state_mask;
+	UnlockMutex (task->state_mutex);
+	old_state &= state_mask;
+	return old_state;
+}
+
+DWORD
+Task_ReadState (Task task, DWORD state_mask)
+{
+	return task->state & state_mask;
+}
+
+void 
+InitTaskSystem (void)
+{
+	int i;
+	for (i = 0; i < TASK_MAX; ++i)
+	{
+		task_array[i].state_mutex = CreateMutex ("task manager lock", SYNC_CLASS_TOPLEVEL | SYNC_CLASS_RESOURCE);
+	}
+}
+
+void 
+CleanupTaskSystem (void)
+{
+	int i;
+	for (i = 0; i < TASK_MAX; ++i)
+	{
+		DestroyMutex (task_array[i].state_mutex);
+		task_array[i].state_mutex = 0;
+	}
+}
+
-- 
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