mirror of
https://github.com/dhewm/dhewm3.git
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173 lines
4.9 KiB
C++
173 lines
4.9 KiB
C++
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/*
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===========================================================================
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Doom 3 GPL Source Code
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Copyright (C) 1999-2011 id Software LLC, a ZeniMax Media company.
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This file is part of the Doom 3 GPL Source Code ("Doom 3 Source Code").
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Doom 3 Source Code is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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Doom 3 Source Code is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with Doom 3 Source Code. If not, see <http://www.gnu.org/licenses/>.
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In addition, the Doom 3 Source Code is also subject to certain additional terms. You should have received a copy of these additional terms immediately following the terms and conditions of the GNU General Public License which accompanied the Doom 3 Source Code. If not, please request a copy in writing from id Software at the address below.
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If you have questions concerning this license or the applicable additional terms, you may contact in writing id Software LLC, c/o ZeniMax Media Inc., Suite 120, Rockville, Maryland 20850 USA.
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===========================================================================
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*/
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#include <SDL_mutex.h>
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#include "sys/platform.h"
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#include "framework/Common.h"
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#include "sys/sys_public.h"
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static SDL_mutex *mutex[MAX_CRITICAL_SECTIONS] = { };
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static SDL_cond *cond[MAX_TRIGGER_EVENTS] = { };
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static bool signaled[MAX_TRIGGER_EVENTS] = { };
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static bool waiting[MAX_TRIGGER_EVENTS] = { };
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/*
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==================
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Sys_InitThreads
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==================
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*/
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void Sys_InitThreads() {
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// critical sections
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for (int i = 0; i < MAX_CRITICAL_SECTIONS; i++) {
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mutex[i] = SDL_CreateMutex();
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if (!mutex[i]) {
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Sys_Printf("ERROR: SDL_CreateMutex failed\n");
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return;
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}
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}
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// events
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for (int i = 0; i < MAX_TRIGGER_EVENTS; i++) {
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cond[i] = SDL_CreateCond();
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if (!cond[i]) {
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Sys_Printf("ERROR: SDL_CreateCond failed\n");
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return;
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}
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signaled[i] = false;
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waiting[i] = false;
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}
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}
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/*
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==================
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Sys_ShutdownThreads
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==================
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*/
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void Sys_ShutdownThreads() {
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// events
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for (int i = 0; i < MAX_TRIGGER_EVENTS; i++) {
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SDL_DestroyCond(cond[i]);
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cond[i] = NULL;
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signaled[i] = false;
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waiting[i] = false;
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}
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// critical sections
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for (int i = 0; i < MAX_CRITICAL_SECTIONS; i++) {
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SDL_DestroyMutex(mutex[i]);
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mutex[i] = NULL;
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}
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}
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/*
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==================
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Sys_EnterCriticalSection
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==================
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*/
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void Sys_EnterCriticalSection(int index) {
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assert(index >= 0 && index < MAX_CRITICAL_SECTIONS);
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if (SDL_LockMutex(mutex[index]) != 0)
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common->Error("ERROR: SDL_LockMutex failed\n");
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}
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/*
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==================
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Sys_LeaveCriticalSection
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==================
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*/
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void Sys_LeaveCriticalSection(int index) {
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assert(index >= 0 && index < MAX_CRITICAL_SECTIONS);
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if (SDL_UnlockMutex(mutex[index]) != 0)
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common->Error("ERROR: SDL_UnlockMutex failed\n");
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}
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/*
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======================================================
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wait and trigger events
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we use a single lock to manipulate the conditions, CRITICAL_SECTION_SYS
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the semantics match the win32 version. signals raised while no one is waiting stay raised until a wait happens (which then does a simple pass-through)
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NOTE: we use the same mutex for all the events. I don't think this would become much of a problem
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cond_wait unlocks atomically with setting the wait condition, and locks it back before exiting the function
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the potential for time wasting lock waits is very low
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======================================================
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*/
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/*
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==================
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Sys_WaitForEvent
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==================
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*/
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void Sys_WaitForEvent(int index) {
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assert(index >= 0 && index < MAX_TRIGGER_EVENTS);
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Sys_EnterCriticalSection(CRITICAL_SECTION_SYS);
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assert(!waiting[index]); // WaitForEvent from multiple threads? that wouldn't be good
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if (signaled[index]) {
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// emulate windows behaviour: signal has been raised already. clear and keep going
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signaled[index] = false;
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} else {
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waiting[index] = true;
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if (SDL_CondWait(cond[index], mutex[CRITICAL_SECTION_SYS]) != 0)
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common->Error("ERROR: SDL_CondWait failed\n");
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waiting[index] = false;
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}
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Sys_LeaveCriticalSection(CRITICAL_SECTION_SYS);
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}
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/*
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==================
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Sys_TriggerEvent
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==================
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*/
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void Sys_TriggerEvent(int index) {
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assert(index >= 0 && index < MAX_TRIGGER_EVENTS);
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Sys_EnterCriticalSection(CRITICAL_SECTION_SYS);
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if (waiting[index]) {
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if (SDL_CondSignal(cond[index]) != 0)
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common->Error("ERROR: SDL_CondSignal failed\n");
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} else {
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// emulate windows behaviour: if no thread is waiting, leave the signal on so next wait keeps going
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signaled[index] = true;
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}
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Sys_LeaveCriticalSection(CRITICAL_SECTION_SYS);
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}
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