remove the loop condition for framelimiter

this was for an older iteration where it ran the loop until it hit the target per condition, keeping like this may cause issue if the loop exits per condition instead of the return block
now we return from within the loop

src/CMakeLists.txt

@@ -191,7 +191,6 @@ set(SRB2_CORE_GAME_SOURCES
 	k_kart.c
 	k_stats.c
 	i_time.c
-	i_threads.c
 
 	p_local.h
 	p_maputl.h

src/Makefile.d/dedicated.mk

@@ -8,6 +8,11 @@ ifdef MINGW
 libs+=-mconsole
 endif
 
+ifndef NOTHREADS
+opts+=-DHAVE_THREADS
+sources+=dedicated/i_threads.c
+endif
+
 NOOPENMPT=1
 NOLIBGME=1
 NOHW=1

src/Makefile.d/features.mk

@@ -27,11 +27,6 @@ endif
 sources+=$(call List,hardware/Sourcefile)
 endif
 
-ifndef NOTHREADS
-opts+=-DHAVE_THREADS
-sources+=i_threads.c
-endif
-
 ifndef NOMD5
 sources+=md5.c
 endif

src/Makefile.d/sdl.mk

@@ -40,6 +40,11 @@ sources+=sdl/mixer_sound.c
   endif
 endif
 
+ifndef NOTHREADS
+opts+=-DHAVE_THREADS
+sources+=sdl/i_threads.c
+endif
+
 ifdef SDL_PKGCONFIG
 $(eval $(call Use_pkg_config,SDL))
 else

src/console.c

@@ -44,14 +44,14 @@
 #define MAXHUDLINES 20
 
 #ifdef HAVE_THREADS
-I_Mutex con_mutex;
+I_mutex con_mutex;
 
 // g_in_exiting_signal_handler is an evil hack
 // to avoid infinite SIGABRT recursion in the signal handler
 // due to poisoned locks or mach-o kernel not supporting locks in signals
 // or something like that. idk
-#  define Lock_state()    if (!g_in_exiting_signal_handler) { I_LockMutex(&con_mutex); }
-#  define Unlock_state()  if (!g_in_exiting_signal_handler) { I_UnlockMutex(con_mutex); }
+#  define Lock_state()    if (!g_in_exiting_signal_handler) { I_lock_mutex(&con_mutex); }
+#  define Unlock_state()  if (!g_in_exiting_signal_handler) { I_unlock_mutex(con_mutex); }
 #else/*HAVE_THREADS*/
 #  define Lock_state()
 #  define Unlock_state()

src/console.h

@@ -22,7 +22,7 @@ void CON_Init(void);
 boolean CON_Responder(event_t *ev);
 
 #ifdef HAVE_THREADS
-extern I_Mutex con_mutex;
+extern I_mutex con_mutex;
 #endif
 
 // set true when screen size has changed, to adapt console

src/d_clisrv.c

@@ -2830,11 +2830,11 @@ static boolean CL_ServerConnectionTicker(const char *tmpsave, tic_t *oldtic, tic
 			F_TitleScreenDrawer();
 			CL_DrawConnectionStatus();
 #ifdef HAVE_THREADS
-			I_LockMutex(&m_menu_mutex);
+			I_lock_mutex(&m_menu_mutex);
 #endif
 			M_Drawer(); //Needed for drawing messageboxes on the connection screen
 #ifdef HAVE_THREADS
-			I_UnlockMutex(m_menu_mutex);
+			I_unlock_mutex(m_menu_mutex);
 #endif
 			I_UpdateNoVsync(); // page flip or blit buffer
 			if (moviemode)
@@ -7187,12 +7187,12 @@ void NetUpdate(void)
 	{
 		resptime = nowtime;
 #ifdef HAVE_THREADS
-		I_LockMutex(&m_menu_mutex);
+		I_lock_mutex(&m_menu_mutex);
 #endif
 		M_Ticker();
 		refreshdirmenu = 0;
 #ifdef HAVE_THREADS
-		I_UnlockMutex(m_menu_mutex);
+		I_unlock_mutex(m_menu_mutex);
 #endif
 		CON_Ticker();
 	}

src/d_main.c

@@ -223,13 +223,13 @@ void D_ProcessEvents(void)
 
 		// Menu input
 #ifdef HAVE_THREADS
-		I_LockMutex(&m_menu_mutex);
+		I_lock_mutex(&m_menu_mutex);
 #endif
 		{
 			eaten = M_Responder(ev);
 		}
 #ifdef HAVE_THREADS
-		I_UnlockMutex(m_menu_mutex);
+		I_unlock_mutex(m_menu_mutex);
 #endif
 
 		if (eaten)
@@ -244,13 +244,13 @@ void D_ProcessEvents(void)
 
 		// console input
 #ifdef HAVE_THREADS
-		I_LockMutex(&con_mutex);
+		I_lock_mutex(&con_mutex);
 #endif
 		{
 			eaten = CON_Responder(ev);
 		}
 #ifdef HAVE_THREADS
-		I_UnlockMutex(con_mutex);
+		I_unlock_mutex(con_mutex);
 #endif
 
 		if (eaten)
@@ -577,11 +577,11 @@ static boolean D_Display(void)
 	vid.recalc = false;
 
 #ifdef HAVE_THREADS
-	I_LockMutex(&m_menu_mutex);
+	I_lock_mutex(&m_menu_mutex);
 #endif
 	M_Drawer(); // menu is drawn even on top of everything...
 #ifdef HAVE_THREADS
-	I_UnlockMutex(m_menu_mutex);
+	I_unlock_mutex(m_menu_mutex);
 #endif
 	// focus lost moved to M_Drawer
 
@@ -653,6 +653,68 @@ static boolean D_Display(void)
 	return ranwipe;
 }
 
+static UINT64 precision = 0;
+static precise_t sleeptime = 0;
+
+static void D_LimitFps(void)
+{
+	static precise_t curtime = 0, lasttime = 0;
+	static precise_t start;
+	precise_t elapsed = 0;
+
+	sleeptime = 0;
+
+	// timedemo runs uncapped!
+	if (singletics)
+		return;
+
+	// in the case of "match refresh rate" + vsync, don't sleep at all
+	if (cv_vidwait.value && cv_fpscap.value == 0)
+		return;
+
+	const UINT32 framecap = R_GetFramerateCap();
+
+	// uncapped obviously does not need to be... capped...
+	if (framecap == 0)
+		return;
+
+	start = I_GetPreciseTime();
+
+	// frametarget in precise_t ticks (ex. 60fps = ~16,666,666)
+	const precise_t frametarget = precision / framecap;
+
+	while (1)
+	{
+		// check the current time against the "time of the old frame""
+		curtime = I_GetPreciseTime();
+		elapsed = curtime - lasttime;
+
+		// done waiting!
+		// continue as normal
+		if (elapsed >= frametarget)
+		{
+			lasttime = curtime;
+
+			// time we spent :chaosleep:ing or doing absolutely nothing
+			// for frameskip calculations
+			sleeptime = curtime - start;
+			return;
+		}
+
+		// if we have more than 1ms to wait
+		// sleep for a bit to not trash the cpu lul
+		precise_t remaining = frametarget - elapsed;
+
+		if (remaining > (precise_t)(precision / 1000))
+		{
+			// sleep for 90% of the time we gotta wait for the next frame
+			// since we dont wanna oversleep :chaosleep:
+			I_SleepDuration(9 * remaining / 10);
+		}
+	}
+	// the rest we just be waitin until we meet our frametime target
+}
+
 // =========================================================================
 // D_SRB2Loop
 // =========================================================================
@@ -664,7 +726,6 @@ void D_SRB2Loop(void)
 	tic_t entertic = 0, oldentertics = 0, realtics = 0, rendertimeout = INFTICS;
 	double deltatics = 0.0;
 	double deltasecs = 0.0;
-	UINT64 precision = 0;
 
 	boolean interp = false;
 	boolean doDisplay = false;
@@ -704,22 +765,16 @@ void D_SRB2Loop(void)
 
 	for (;;)
 	{
-		// capbudget is the minimum precise_t duration of a single loop iteration
-		precise_t capbudget;
 		precise_t elapsed;
 		precise_t enterprecise, finishprecise;
 
 		enterprecise = I_GetPreciseTime();
 
+		boolean ranwipe = false;
+
 		memset(&g_dc, 0, sizeof(g_dc));
 		Z_Frame_Reset();
 
-		// Casting the return value of a function is bad practice (apparently)
-		const UINT32 framecap = R_GetFramerateCap();
-		capbudget = (framecap == 0) ? 0 : (precise_t)((double)precision / (double)framecap + 0.5); // + 0.5 instead of round
-
-		boolean ranwipe = false;
-
 		I_UpdateTime(cv_timescale.value);
 
 		if (lastwipetic)
@@ -809,6 +864,10 @@ void D_SRB2Loop(void)
 			R_SetTimeFrac(FRACUNIT);
 		}
 
+		// be sure to limit our fps *before* drawing
+		// so we can properly "pace" our frames
+		D_LimitFps();
+
 		if (interp || doDisplay)
 		{
 			if (!frameskip)
@@ -843,9 +902,9 @@ void D_SRB2Loop(void)
 		// Fully completed frame made.
 		finishprecise = I_GetPreciseTime();
 
-		// Use the time before sleep for frameskip calculations:
+		// Use the time without sleep for frameskip calculations:
 		// post-sleep time is literally being intentionally wasted
-		elapsed = finishprecise - enterprecise;
+		elapsed = (finishprecise - enterprecise) - sleeptime;
 		deltasecs = (double)elapsed / (double)precision;
 		deltatics = deltasecs * (double)NEWTICRATE;
 
@@ -873,19 +932,6 @@ void D_SRB2Loop(void)
 			frameskip = 0;
 		}
 
-		if (!singletics)
-		{
-			// in the case of "match refresh rate" + vsync, don't sleep at all
-			const boolean vsync_with_match_refresh = cv_vidwait.value && cv_fpscap.value == 0;
-
-			if ((elapsed > 0) && (capbudget > elapsed) && !vsync_with_match_refresh)
-			{
-				I_SleepDuration(capbudget - elapsed);
-			}
-		}
-
-		// Capture the time once more to get the real delta time.
-		finishprecise = I_GetPreciseTime();
 		elapsed = finishprecise - enterprecise;
 		deltasecs = (double)elapsed / (double)precision;
 		deltatics = deltasecs * (double)NEWTICRATE;

src/d_netfil.c

@@ -112,7 +112,7 @@ static fileused_t transferFiles[UINT8_MAX + 1];
 INT32 fileneedednum = 0; // Number of files needed to join the server
 fileneeded_t fileneeded[MAX_WADFILES] = {}; // List of needed files
 #ifdef HAVE_THREADS
-static I_Mutex downloadmutex;
+static I_mutex downloadmutex;
 #endif
 char downloaddir[512] = "DOWNLOAD";
 
@@ -1427,7 +1427,7 @@ void CURLPrepareFile(const char* url, int dfilenum)
 		filedownload.http_running = true;
 
 #ifdef HAVE_THREADS
-		(void)!I_SpawnThread("http-download", (I_ThreadFn)CURLGetFile, NULL);
+		I_spawn_thread("http-download", (I_thread_fn)CURLGetFile, NULL);
 #endif
 	}
 	else
@@ -1440,15 +1440,15 @@ void CURLAbortFile(void)
 
 #ifdef HAVE_THREADS
 	// lock and unlock to wait for the download thread to exit
-	I_LockMutex(&downloadmutex);
-	I_UnlockMutex(downloadmutex);
+	I_lock_mutex(&downloadmutex);
+	I_unlock_mutex(downloadmutex);
 #endif
 }
 
 static void CURLGetFile(void)
 {
 #ifdef HAVE_THREADS
-	I_LockMutex(&downloadmutex);
+	I_lock_mutex(&downloadmutex);
 #endif
 	CURLMcode mc; /* return code used by curl_multi_wait() */
 	CURLcode easyres; /* Return from easy interface */
@@ -1549,7 +1549,7 @@ static void CURLGetFile(void)
 
 	filedownload.http_running = false;
 #ifdef HAVE_THREADS
-	I_UnlockMutex(downloadmutex);
+	I_unlock_mutex(downloadmutex);
 #endif
 }
 

src/dedicated/Sourcefile

@@ -2,5 +2,6 @@ i_system.c
 i_main.c
 i_video.c
 i_sound.c
+i_threads.c
 dosstr.c
 endtxt.c

src/dedicated/i_system.c

@@ -1381,8 +1381,8 @@ INT32 I_StartupSystem(void)
 		I_Fork();
 #endif
 #ifdef HAVE_THREADS
-	I_StartThreads();
-	I_AddExitFunc(I_StopThreads);
+	I_start_threads();
+	I_AddExitFunc(I_stop_threads);
 #endif
 	I_RegisterSignals();
 #ifndef NOMUMBLE

src/dedicated/i_threads.c

@@ -1,4 +1,4 @@
-// SONIC ROBO BLAST 2 KART
+// SONIC ROBO BLAST 2
 //-----------------------------------------------------------------------------
 // Copyright (C) 2020-2023 by James R.
 //
@@ -9,14 +9,12 @@
 /// \file  i_threads.c
 /// \brief Multithreading abstraction
 
-#ifdef HAVE_THREADS
-#if defined (__unix__) || defined(UNIXCOMMON)
+#if defined (__unix__) || (!defined(__APPLE__) && defined (UNIXCOMMON))
 
 #include <pthread.h>
 
-#include "i_threads.h"
-#include "doomdef.h"
-#include "doomtype.h"
+#include "../i_threads.h"
+#include "../doomdef.h"
 
 typedef struct thread_s thread_t;
 
@@ -24,7 +22,7 @@ struct thread_s
 {
 	thread_t *next;
 	void *userdata;
-	I_ThreadFn func;
+	I_thread_fn func;
 	pthread_t thread;
 };
 
@@ -43,8 +41,12 @@ static void *HandleThread(void *data)
 	return NULL;
 }
 
-FUNCWARNRV
-int I_SpawnThread(const char *name, I_ThreadFn entry, void *userdata)
+void
+I_spawn_thread (
+	const char  * name,
+	I_thread_fn   entry,
+	void        * userdata
+)
 {
 	thread_t *thread;
 	(void)name;
@@ -64,20 +66,17 @@ int I_SpawnThread(const char *name, I_ThreadFn entry, void *userdata)
 	if (thread == NULL)
 	{
 		thread = malloc(sizeof(thread_t));
-		if (thread == NULL)
-			return false;
 		thread->next = thread_list;
 		thread_list = thread;
 	}
 
 	thread->func = entry;
 	thread->userdata = userdata;
-	int err = pthread_create(&thread->thread, NULL, HandleThread, thread);
+	pthread_create(&thread->thread, NULL, HandleThread, thread);
 	pthread_mutex_unlock(&thread_lock);
-	return err == 0;
 }
 
-int I_ThreadIsStopped(void)
+int I_thread_is_stopped(void)
 {
 	thread_t *thread;
 	pthread_mutex_lock(&thread_lock);
@@ -95,11 +94,11 @@ int I_ThreadIsStopped(void)
 	return true;
 }
 
-void I_StartThreads(void)
+void I_start_threads(void)
 {
 }
 
-void I_StopThreads(void)
+void I_stop_threads(void)
 {
 	thread_t *thread = thread_list;
 	while (thread != NULL)
@@ -110,7 +109,7 @@ void I_StopThreads(void)
 	}
 }
 
-void I_LockMutex(I_Mutex *anchor)
+void I_lock_mutex(I_mutex *anchor)
 {
 	pthread_mutex_lock(&thread_lock);
 	if (*anchor == NULL)
@@ -128,25 +127,25 @@ void I_LockMutex(I_Mutex *anchor)
 	pthread_mutex_lock(*anchor);
 }
 
-void I_UnlockMutex(I_Mutex id)
+void I_unlock_mutex(I_mutex id)
 {
 	pthread_mutex_unlock(id);
 }
 
-void I_HoldCond(I_Cond *condAnchor, I_Mutex mutexId)
+void I_hold_cond(I_cond *cond_anchor, I_mutex mutex_id)
 {
-	I_Assert(mutexId != NULL);
+	I_Assert(mutex_id != NULL);
 	pthread_mutex_lock(&thread_lock);
-	if (*condAnchor == NULL)
+	if (*cond_anchor == NULL)
 	{
-		*condAnchor = malloc(sizeof(pthread_cond_t));
-		pthread_cond_init(*condAnchor, NULL);
+		*cond_anchor = malloc(sizeof(pthread_cond_t));
+		pthread_cond_init(*cond_anchor, NULL);
 	}
 	pthread_mutex_unlock(&thread_lock);
-	pthread_cond_wait(*condAnchor, mutexId);
+	pthread_cond_wait(*cond_anchor, mutex_id);
 }
 
-void I_WakeOneCond(I_Cond *anchor)
+void I_wake_one_cond(I_cond *anchor)
 {
 	pthread_mutex_lock(&thread_lock);
 	if (*anchor == NULL)
@@ -158,7 +157,7 @@ void I_WakeOneCond(I_Cond *anchor)
 	pthread_cond_signal(*anchor);
 }
 
-void I_WakeAllCond(I_Cond *anchor)
+void I_wake_all_cond(I_cond *anchor)
 {
 	pthread_mutex_lock(&thread_lock);
 	if (*anchor == NULL)
@@ -169,17 +168,12 @@ void I_WakeAllCond(I_Cond *anchor)
 	pthread_mutex_unlock(&thread_lock);
 	pthread_cond_broadcast(*anchor);
 }
-
-thread_handle_t I_GetCurrentThread(void)
-{
-	return pthread_self();
-}
 #elif defined (_WIN32)
 #include <windows.h>
 
-#include "i_threads.h"
-#include "doomdef.h"
-#include "doomtype.h"
+#include "../i_threads.h"
+#include "../doomdef.h"
+#include "../doomtype.h"
 
 typedef struct thread_s thread_t;
 
@@ -187,9 +181,9 @@ struct thread_s
 {
 	thread_t *next;
 	void *userdata;
-	I_ThreadFn func;
+	I_thread_fn func;
 	HANDLE thread;
-	DWORD threadId;
+	DWORD thread_id;
 };
 
 // we use a linked list to avoid moving memory blocks when allocating new threads.
@@ -207,8 +201,7 @@ static DWORD __stdcall HandleThread(void *data)
 	return 0;
 }
 
-FUNCWARNRV
-int I_SpawnThread(const char *name, I_ThreadFn entry, void *userdata)
+void I_spawn_thread(const char *name, I_thread_fn entry, void *userdata)
 {
 	thread_t *thread;
 	(void)name;
@@ -226,20 +219,17 @@ int I_SpawnThread(const char *name, I_ThreadFn entry, void *userdata)
 	if (thread == NULL)
 	{
 		thread = malloc(sizeof(thread_t));
-		if (thread == NULL)
-			return false;
 		thread->next = thread_list;
 		thread_list = thread;
 	}
 
 	thread->func = entry;
 	thread->userdata = userdata;
-	thread->thread = CreateThread(NULL, 0, HandleThread, thread, 0, &thread->threadId);
+	thread->thread = CreateThread(NULL, 0, HandleThread, thread, 0, &thread->thread_id);
 	LeaveCriticalSection(&thread_lock);
-	return thread->thread != NULL;
 }
 
-int I_ThreadIsStopped(void)
+int I_thread_is_stopped(void)
 {
 	thread_t *thread;
 	EnterCriticalSection(&thread_lock);
@@ -257,12 +247,12 @@ int I_ThreadIsStopped(void)
 	return true;
 }
 
-void I_StartThreads(void)
+void I_start_threads(void)
 {
 	InitializeCriticalSection(&thread_lock);
 }
 
-void I_StopThreads(void)
+void I_stop_threads(void)
 {
 	thread_t *thread = thread_list;
 	while (thread != NULL)
@@ -274,7 +264,7 @@ void I_StopThreads(void)
 	DeleteCriticalSection(&thread_lock);
 }
 
-void I_LockMutex(I_Mutex *anchor)
+void I_lock_mutex(I_mutex *anchor)
 {
 	EnterCriticalSection(&thread_lock);
 	if (*anchor == NULL)
@@ -286,25 +276,25 @@ void I_LockMutex(I_Mutex *anchor)
 	EnterCriticalSection(*anchor);
 }
 
-void I_UnlockMutex(I_Mutex id)
+void I_unlock_mutex(I_mutex id)
 {
 	LeaveCriticalSection(id);
 }
 
-void I_HoldCond(I_Cond *condAnchor, I_Mutex mutexId)
+void I_hold_cond(I_cond *cond_anchor, I_mutex mutex_id)
 {
-	I_Assert(mutexId != NULL);
+	I_Assert(mutex_id != NULL);
 	EnterCriticalSection(&thread_lock);
-	if (*condAnchor == NULL)
+	if (*cond_anchor == NULL)
 	{
-		*condAnchor = malloc(sizeof(CONDITION_VARIABLE));
-		InitializeConditionVariable(*condAnchor);
+		*cond_anchor = malloc(sizeof(CONDITION_VARIABLE));
+		InitializeConditionVariable(*cond_anchor);
 	}
 	LeaveCriticalSection(&thread_lock);
-	SleepConditionVariableCS(*condAnchor, mutexId, INFINITE);
+	SleepConditionVariableCS(*cond_anchor, mutex_id, INFINITE);
 }
 
-void I_WakeOneCond(I_Cond *anchor)
+void I_wake_one_cond(I_cond *anchor)
 {
 	EnterCriticalSection(&thread_lock);
 	if (*anchor == NULL)
@@ -316,7 +306,7 @@ void I_WakeOneCond(I_Cond *anchor)
 	WakeConditionVariable(*anchor);
 }
 
-void I_WakeAllCond(I_Cond *anchor)
+void I_wake_all_cond(I_cond *anchor)
 {
 	EnterCriticalSection(&thread_lock);
 	if (*anchor == NULL)
@@ -327,66 +317,48 @@ void I_WakeAllCond(I_Cond *anchor)
 	LeaveCriticalSection(&thread_lock);
 	WakeAllConditionVariable(*anchor);
 }
-
-void *I_GetCurrentThread(void)
-{
-	return GetCurrentThread();
-}
 #else
-#include "i_threads.h"
-
-FUNCWARNRV
-int I_SpawnThread(const char *name, I_ThreadFn entry, void *userdata)
+void I_spawn_thread(const char *name, I_thread_fn entry, void *userdata)
 {
 	(void)name;
 	entry(userdata);
-	return true;
 }
 
-int I_ThreadIsStopped(void)
-{
-	return true;
-}
-
-void I_StartThreads(void)
+int I_thread_is_stopped(void)
 {
 }
 
-void I_StopThreads(void)
+void I_start_threads(void)
 {
 }
 
-void I_LockMutex(I_Mutex *anchor)
+void I_stop_threads(void)
+{
+}
+
+void I_lock_mutex(I_mutex *anchor)
 {
 	(void)anchor;
 }
 
-void I_UnlockMutex(I_Mutex id)
+void I_unlock_mutex(I_mutex id)
 {
 	(void)id;
 }
 
-void I_HoldCond(I_Cond *condAnchor, I_Mutex mutexId)
+void I_hold_cond(I_cond *cond_anchor, I_mutex mutex_id)
 {
-	(void)condAnchor;
-	(void)mutexId;
+	(void)cond_anchor;
+	(void)mutex_id;
 }
 
-void I_WakeOneCond(I_Cond *anchor)
+void I_wake_one_cond(I_cond *anchor)
 {
 	(void)anchor;
 }
 
-void I_WakeAllCond(I_Cond *anchor)
+void I_wake_all_cond(I_cond *anchor)
 {
 	(void)anchor;
 }
-
-void *I_GetCurrentThread(void)
-{
-	return NULL;
-}
 #endif
-
-
-#endif // HAVE_THREADS

src/doomtype.h

@@ -223,8 +223,6 @@ typedef int32_t boolean;
 
 	#define FUNCNOINLINE __attribute__((noinline))
 
-	#define FUNCWARNRV __attribute__((warn_unused_result))
-
 	#if (__GNUC__ > 4) || (__GNUC__ == 4 && __GNUC_MINOR__ >= 4) // >= GCC 4.4
 		#ifdef __i386__ // i386 only
 			#define FUNCTARGET(X)  __attribute__ ((__target__ (X)))
@@ -270,9 +268,6 @@ typedef int32_t boolean;
 #ifndef FUNCTARGET
 #define FUNCTARGET(x)
 #endif
-#ifndef FUNCWARNRV
-#define FUNCWARNRV
-#endif
 #ifndef ATTRPACK
 #define ATTRPACK
 #endif

src/f_wipe.c

@@ -388,11 +388,11 @@ void F_RunWipe(UINT8 wipetype, boolean drawMenu)
 		if (rendermode != render_none && drawMenu)
 		{
 #ifdef HAVE_THREADS
-			I_LockMutex(&m_menu_mutex);
+			I_lock_mutex(&m_menu_mutex);
 #endif
 			M_Drawer(); // menu is drawn even on top of wipes
 #ifdef HAVE_THREADS
-			I_UnlockMutex(m_menu_mutex);
+			I_unlock_mutex(m_menu_mutex);
 #endif
 		}
 

src/http-mserv.c

@@ -62,7 +62,7 @@ static int hms_started;
 
 static char *hms_api;
 #ifdef HAVE_THREADS
-static I_Mutex hms_api_mutex;
+static I_mutex hms_api_mutex;
 #endif
 
 static char *hms_server_token;
@@ -90,9 +90,9 @@ Printf_url (const char *url)
 	boolean startup;
 
 #ifdef HAVE_THREADS
-	I_LockMutex(&con_mutex);
+	I_lock_mutex(&con_mutex);
 	startup = con_startup;
-	I_UnlockMutex(con_mutex);
+	I_unlock_mutex(con_mutex);
 #else
 	startup = con_startup;
 #endif
@@ -183,7 +183,7 @@ HMS_connect (const char *format, ...)
 	}
 
 #ifdef HAVE_THREADS
-	I_LockMutex(&hms_api_mutex);
+	I_lock_mutex(&hms_api_mutex);
 #endif
 
 	seek = strlen(hms_api) + 1;/* + '/' */
@@ -195,7 +195,7 @@ HMS_connect (const char *format, ...)
 	sprintf(url, "%s/", hms_api);
 
 #ifdef HAVE_THREADS
-	I_UnlockMutex(hms_api_mutex);
+	I_unlock_mutex(hms_api_mutex);
 #endif
 
 	va_start (ap, format);
@@ -225,9 +225,10 @@ HMS_connect (const char *format, ...)
 	{
 		cc = curl_easy_setopt(curl, CURLOPT_VERBOSE, 1L);
 		if (cc != CURLE_OK) I_OutputMsg("libcurl: %s\n", buffer->errbuf);
-
+#ifdef LOGMESSAGES
 		cc = curl_easy_setopt(curl, CURLOPT_STDERR, logstream);
 		if (cc != CURLE_OK) I_OutputMsg("libcurl: %s\n", buffer->errbuf);
+#endif
 	}
 
 	if (M_CheckParm("-bindaddr") && M_IsNextParm())
@@ -477,12 +478,12 @@ HMS_fetch_servers (msg_server_t *list, int query_id)
 			if (address && port)
 			{
 #ifdef HAVE_THREADS
-				I_LockMutex(&ms_QueryId_mutex);
+				I_lock_mutex(&ms_QueryId_mutex);
 				{
 					if (query_id != ms_QueryId)
 						doing_shit = 0;
 				}
-				I_UnlockMutex(ms_QueryId_mutex);
+				I_unlock_mutex(ms_QueryId_mutex);
 
 				if (! doing_shit)
 					break;
@@ -611,14 +612,14 @@ void
 HMS_set_api (char *api)
 {
 #ifdef HAVE_THREADS
-	I_LockMutex(&hms_api_mutex);
+	I_lock_mutex(&hms_api_mutex);
 #endif
 	{
 		free(hms_api);
 		hms_api = Strip_trailing_slashes(api);
 	}
 #ifdef HAVE_THREADS
-	I_UnlockMutex(hms_api_mutex);
+	I_unlock_mutex(hms_api_mutex);
 #endif
 }
 

src/i_threads.h

@@ -1,6 +1,6 @@
 // SONIC ROBO BLAST 2 KART
 //-----------------------------------------------------------------------------
-// Copyright (C) 2020-2023 by James R.
+// Copyright (C) 2020 by James R.
 //
 // This program is free software distributed under the
 // terms of the GNU General Public License, version 2.
@@ -14,46 +14,34 @@
 #ifndef I_THREADS_H
 #define I_THREADS_H
 
-#include "doomtype.h"
-
 #ifdef __cplusplus
 extern "C" {
 #endif
 
-typedef void (*I_ThreadFn)(void *userdata);
+typedef void (*I_thread_fn)(void *userdata);
 
-typedef void * I_Mutex;
-typedef void * I_Cond;
+typedef void * I_mutex;
+typedef void * I_cond;
 
-#ifdef __linux__
-typedef long unsigned int thread_handle_t;
-#else
-typedef void *thread_handle_t;
-#endif
+void      I_start_threads (void);
+void      I_stop_threads  (void);
 
-void      I_StartThreads (void);
-void      I_StopThreads  (void);
-
-FUNCWARNRV
-int       I_SpawnThread (const char *name, I_ThreadFn, void *userdata);
+void      I_spawn_thread (const char *name, I_thread_fn, void *userdata);
 
 /* check in your thread whether to return early */
-int       I_ThreadIsStopped (void);
+int       I_thread_is_stopped (void);
 
-void      I_LockMutex      (I_Mutex *);
-void      I_UnlockMutex    (I_Mutex);
+void      I_lock_mutex      (I_mutex *);
+void      I_unlock_mutex    (I_mutex);
 
-void      I_HoldCond       (I_Cond *, I_Mutex);
+void      I_hold_cond       (I_cond *, I_mutex);
 
-void      I_WakeOneCond   (I_Cond *);
-void      I_WakeAllCond   (I_Cond *);
-
-thread_handle_t I_GetCurrentThread(void);
+void      I_wake_one_cond   (I_cond *);
+void      I_wake_all_cond   (I_cond *);
 
 #ifdef __cplusplus
 } // extern "C"
 #endif
 
 #endif/*I_THREADS_H*/
-
 #endif/*HAVE_THREADS*/

src/m_menu.c

@@ -142,7 +142,7 @@ typedef enum
 } text_enum;
 
 #ifdef HAVE_THREADS
-I_Mutex m_menu_mutex;
+I_mutex m_menu_mutex;
 #endif
 
 M_waiting_mode_t m_waiting_mode = M_NOT_WAITING;
@@ -1967,7 +1967,7 @@ void M_Ticker(void)
 	}
 
 #if defined (MASTERSERVER) && defined (HAVE_THREADS)
-	I_LockMutex(&ms_ServerList_mutex);
+	I_lock_mutex(&ms_ServerList_mutex);
 	{
 		if (ms_ServerList)
 		{
@@ -1976,7 +1976,7 @@ void M_Ticker(void)
 			ms_ServerList = NULL;
 		}
 	}
-	I_UnlockMutex(ms_ServerList_mutex);
+	I_unlock_mutex(ms_ServerList_mutex);
 #endif
 }
 
@@ -4014,14 +4014,14 @@ size_t demolist_all_size = 0;
 boolean replaynamesloaded = false;
 
 #ifdef HAVE_THREADS
-I_Mutex replayquerymutex;
+I_mutex replayquerymutex;
 
 // g_in_exiting_signal_handler is an evil hack
 // to avoid infinite SIGABRT recursion in the signal handler
 // due to poisoned locks or mach-o kernel not supporting locks in signals
 // or something like that. idk
-#  define Lock_search_state()    if (!g_in_exiting_signal_handler) { I_LockMutex(&replayquerymutex); }
-#  define Unlock_search_state()  if (!g_in_exiting_signal_handler) { I_UnlockMutex(replayquerymutex); }
+#  define Lock_search_state()    if (!g_in_exiting_signal_handler) { I_lock_mutex(&replayquerymutex); }
+#  define Unlock_search_state()  if (!g_in_exiting_signal_handler) { I_unlock_mutex(replayquerymutex); }
 #else/*HAVE_THREADS*/
 #  define Lock_search_state()
 #  define Unlock_search_state()
@@ -4088,10 +4088,7 @@ static void LoadReplayNames(void)
 	Unlock_search_state();
 
 #ifdef HAVE_THREADS
-	if (!I_SpawnThread("replay-names-load", ReplayNamesLoadThread, replaydirpath))
-	{
-		free(replaydirpath);
-	}
+	I_spawn_thread("replay-names-load", ReplayNamesLoadThread, replaydirpath);
 #else
 	ReplayNamesLoadThread(replaydirpath);
 #endif
@@ -6687,11 +6684,11 @@ static void M_EndGame(INT32 choice)
 void M_SetWaitingMode(int mode)
 {
 #ifdef HAVE_THREADS
-	I_LockMutex(&m_menu_mutex);
+	I_lock_mutex(&m_menu_mutex);
 #endif
 	m_waiting_mode = mode;
 #ifdef HAVE_THREADS
-	I_UnlockMutex(m_menu_mutex);
+	I_unlock_mutex(m_menu_mutex);
 #endif
 }
 
@@ -6700,11 +6697,11 @@ int M_GetWaitingMode(void)
 	int mode;
 
 #ifdef HAVE_THREADS
-	I_LockMutex(&m_menu_mutex);
+	I_lock_mutex(&m_menu_mutex);
 #endif
 	mode = m_waiting_mode;
 #ifdef HAVE_THREADS
-	I_UnlockMutex(m_menu_mutex);
+	I_unlock_mutex(m_menu_mutex);
 #endif
 
 	return mode;
@@ -6716,23 +6713,20 @@ static void Spawn_masterserver_thread(const char *name, void (*thread)(int*))
 {
 	int *id = malloc(sizeof *id);
 
-	I_LockMutex(&ms_QueryId_mutex);
+	I_lock_mutex(&ms_QueryId_mutex);
 	*id = ms_QueryId;
-	I_UnlockMutex(ms_QueryId_mutex);
+	I_unlock_mutex(ms_QueryId_mutex);
 
-	if (!I_SpawnThread(name, (I_ThreadFn)thread, id))
-	{
-		free(id);
-	}
+	I_spawn_thread(name, (I_thread_fn)thread, id);
 }
 
 static int Same_instance(int id)
 {
 	int okay;
 
-	I_LockMutex(&ms_QueryId_mutex);
+	I_lock_mutex(&ms_QueryId_mutex);
 	okay = ( id == ms_QueryId );
-	I_UnlockMutex(ms_QueryId_mutex);
+	I_unlock_mutex(ms_QueryId_mutex);
 
 	return okay;
 }
@@ -6761,9 +6755,9 @@ static void Fetch_servers_thread(int *id)
 			M_SetWaitingMode(M_NOT_WAITING);
 
 #ifdef HAVE_THREADS
-			I_LockMutex(&ms_ServerList_mutex);
+			I_lock_mutex(&ms_ServerList_mutex);
 			ms_ServerList = server_list;
-			I_UnlockMutex(ms_ServerList_mutex);
+			I_unlock_mutex(ms_ServerList_mutex);
 #else
 			CL_QueryServerList(server_list);
 			free(server_list);
@@ -6796,7 +6790,7 @@ static void M_SearchServerList(void)
 	serverlistsearchedcount = 0;
 
 #ifdef HAVE_THREADS
-	I_LockMutex(&ms_ServerList_mutex);
+	I_lock_mutex(&ms_ServerList_mutex);
 #endif
 
 	for (UINT32 i = 0; i < serverlistcount; ++i)
@@ -6807,7 +6801,7 @@ static void M_SearchServerList(void)
 	}
 
 #ifdef HAVE_THREADS
-	I_UnlockMutex(ms_ServerList_mutex);
+	I_unlock_mutex(ms_ServerList_mutex);
 #endif
 
 	if (menuinput.length > 0)
@@ -7173,11 +7167,11 @@ static void M_CheckMODVersion(int id)
 	{
 		sprintf(updatestring, UPDATE_ALERT_STRING, VERSIONSTRING, updatecheck);
 #ifdef HAVE_THREADS
-		I_LockMutex(&m_menu_mutex);
+		I_lock_mutex(&m_menu_mutex);
 #endif
 		M_StartMessage(updatestring, NULL, MM_NOTHING);
 #ifdef HAVE_THREADS
-		I_UnlockMutex(m_menu_mutex);
+		I_unlock_mutex(m_menu_mutex);
 #endif
 	}
 }
@@ -7223,13 +7217,13 @@ static void M_ConnectMenu(INT32 choice)
 	itemOn = 0;
 
 #if defined (MASTERSERVER) && defined (HAVE_THREADS)
-	I_LockMutex(&ms_QueryId_mutex);
+	I_lock_mutex(&ms_QueryId_mutex);
 	{
 		ms_QueryId++;
 	}
-	I_UnlockMutex(ms_QueryId_mutex);
+	I_unlock_mutex(ms_QueryId_mutex);
 
-	I_LockMutex(&ms_ServerList_mutex);
+	I_lock_mutex(&ms_ServerList_mutex);
 	{
 		if (ms_ServerList)
 		{
@@ -7237,7 +7231,7 @@ static void M_ConnectMenu(INT32 choice)
 			ms_ServerList = NULL;
 		}
 	}
-	I_UnlockMutex(ms_ServerList_mutex);
+	I_unlock_mutex(ms_ServerList_mutex);
 
 #ifdef UPDATE_ALERT
 	Spawn_masterserver_thread("check-new-version", Check_new_version_thread);

src/m_menu.h

@@ -215,7 +215,7 @@ void M_SetupNextMenu(menu_t *menudef);
 void M_ClearMenus(boolean callexitmenufunc);
 
 #ifdef HAVE_THREADS
-extern I_Mutex m_menu_mutex;
+extern I_mutex m_menu_mutex;
 #endif
 
 extern menu_t *currentMenu;

src/mserv.c

@@ -41,11 +41,11 @@ static time_t  MSLastPing;
 static char *MSRules;
 
 #ifdef HAVE_THREADS
-static I_Mutex MSMutex;
-static I_Cond  MSCond;
+static I_mutex MSMutex;
+static I_cond  MSCond;
 
-#  define Lock_state()   I_LockMutex  (&MSMutex)
-#  define Unlock_state() I_UnlockMutex (MSMutex)
+#  define Lock_state()   I_lock_mutex  (&MSMutex)
+#  define Unlock_state() I_unlock_mutex (MSMutex)
 #else/*HAVE_THREADS*/
 #  define Lock_state()
 #  define Unlock_state()
@@ -90,10 +90,10 @@ consvar_t cv_masterserver_nagattempts = {"masterserver_nagattempts", "5", CV_SAV
 
 #if defined (MASTERSERVER) && defined (HAVE_THREADS)
 int           ms_QueryId = 0;
-I_Mutex       ms_QueryId_mutex;
+I_mutex       ms_QueryId_mutex;
 
 msg_server_t *ms_ServerList = NULL;
-I_Mutex       ms_ServerList_mutex;
+I_mutex       ms_ServerList_mutex;
 #endif
 
 UINT16 current_port = 0;
@@ -129,11 +129,11 @@ void AddMServCommands(void)
 static void WarnGUI (void)
 {
 #ifdef HAVE_THREADS
-	I_LockMutex(&m_menu_mutex);
+	I_lock_mutex(&m_menu_mutex);
 #endif
 	M_PopupMasterServerConnectError();
 #ifdef HAVE_THREADS
-	I_UnlockMutex(m_menu_mutex);
+	I_unlock_mutex(m_menu_mutex);
 #endif
 }
 
@@ -168,12 +168,12 @@ char *GetMODVersion(int id)
 	c = HMS_compare_mod_version(buffer, 16);
 
 #ifdef HAVE_THREADS
-	I_LockMutex(&ms_QueryId_mutex);
+	I_lock_mutex(&ms_QueryId_mutex);
 	{
 		if (id != ms_QueryId)
 			c = -1;
 	}
-	I_UnlockMutex(ms_QueryId_mutex);
+	I_unlock_mutex(ms_QueryId_mutex);
 #endif
 
 	if (c > 0)
@@ -341,7 +341,7 @@ Finish_unlist (void)
 		Unlock_state();
 
 #ifdef HAVE_THREADS
-		I_WakeAllCond(&MSCond);
+		I_wake_all_cond(&MSCond);
 #endif
 	}
 }
@@ -377,7 +377,7 @@ New_server_id (void)
 	Lock_state();
 	{
 		*id = ++MSId;
-		I_WakeAllCond(&MSCond);
+		I_wake_all_cond(&MSCond);
 	}
 	Unlock_state();
 	return id;
@@ -392,7 +392,7 @@ Register_server_thread (int *id)
 	{
 		/* wait for previous unlist to finish */
 		while (*id == MSId && MSRegistered)
-			I_HoldCond(&MSCond, MSMutex);
+			I_hold_cond(&MSCond, MSMutex);
 
 		same = ( *id == MSId );/* it could have been a while */
 	}
@@ -444,7 +444,7 @@ Change_masterserver_thread (char *api)
 	Lock_state();
 	{
 		while (MSRegistered)
-			I_HoldCond(&MSCond, MSMutex);
+			I_hold_cond(&MSCond, MSMutex);
 	}
 	Unlock_state();
 
@@ -464,9 +464,9 @@ void RegisterServer(void)
 {
 #ifdef MASTERSERVER
 #ifdef HAVE_THREADS
-	(void)!I_SpawnThread(
+	I_spawn_thread(
 			"register-server",
-			(I_ThreadFn)Register_server_thread,
+			(I_thread_fn)Register_server_thread,
 			New_server_id()
 	);
 #else
@@ -478,9 +478,9 @@ void RegisterServer(void)
 static void UpdateServer(void)
 {
 #ifdef HAVE_THREADS
-	(void)!I_SpawnThread(
+	I_spawn_thread(
 			"update-server",
-			(I_ThreadFn)Update_server_thread,
+			(I_thread_fn)Update_server_thread,
 			Server_id()
 	);
 #else
@@ -492,9 +492,9 @@ void UnregisterServer(void)
 {
 #ifdef MASTERSERVER
 #ifdef HAVE_THREADS
-	(void)!I_SpawnThread(
+	I_spawn_thread(
 			"unlist-server",
-			(I_ThreadFn)Unlist_server_thread,
+			(I_thread_fn)Unlist_server_thread,
 			Server_id()
 	);
 #else
@@ -557,18 +557,14 @@ void MasterClient_Ticker(void)
 static void
 Set_api (const char *api)
 {
-	char *dapi = strdup(api);
 #ifdef HAVE_THREADS
-	if (!I_SpawnThread(
-		"change-masterserver",
-		(I_ThreadFn)Change_masterserver_thread,
-					   dapi
-	))
-	{
-		free(dapi);
-	}
+	I_spawn_thread(
+			"change-masterserver",
+			(I_thread_fn)Change_masterserver_thread,
+			strdup(api)
+	);
 #else
-	Finish_masterserver_change(dapi);
+	Finish_masterserver_change(strdup(api));
 #endif
 }
 
@@ -576,9 +572,9 @@ void
 Get_rules (void)
 {
 #ifdef HAVE_THREADS
-	(void)!I_SpawnThread(
-			"get-masterserver-rules",
-			(I_ThreadFn)Get_masterserver_rules_thread,
+	I_spawn_thread(
+		"get-masterserver-rules",
+		(I_thread_fn)Get_masterserver_rules_thread,
 				   NULL
 	);
 #else

src/mserv.h

@@ -69,10 +69,10 @@ extern consvar_t cv_rendezvousserver;
 
 #ifdef HAVE_THREADS
 extern int           ms_QueryId;
-extern I_Mutex       ms_QueryId_mutex;
+extern I_mutex       ms_QueryId_mutex;
 
 extern msg_server_t *ms_ServerList;
-extern I_Mutex       ms_ServerList_mutex;
+extern I_mutex       ms_ServerList_mutex;
 #endif
 #ifdef MASTERSERVER
 void RegisterServer(void);

src/r_draw.cpp

@@ -289,14 +289,8 @@ void R_GenerateBlendTables(void)
 	state->LocalPalette = static_cast<RGBA_t *>(memcpy(malloc(palsize), pLocalPalette, palsize));
 	state->gammaCorrectedPalette = static_cast<RGBA_t *>(memcpy(malloc(palsize), pGammaCorrectedPalette, palsize));
 
-	if (!I_SpawnThread("blend-tables",
-			R_GenerateBlendTables_Thread, state))
-	{
-		free(state->gammaCorrectedPalette);
-		free(state->LocalPalette);
-		free(state);
-		I_Error("R_GenerateBlendTables: Failed to generate BlendTables\n"); // should we just retry on main thread instead?
-	}
+	I_spawn_thread("blend-tables",
+			R_GenerateBlendTables_Thread, state);
 #else
 	struct GenerateBlendTables_State state = {pLocalPalette, pGammaCorrectedPalette};
 	R_GenerateBlendTables_Core(&state);

src/sdl/CMakeLists.txt

@@ -35,6 +35,7 @@ set(SRB2_SDL2_SOURCES
 	i_system.cpp
 	i_ttf.c
 	i_video.c
+	i_threads.c
 	#IMG_xpm.c
 	ogl_sdl.c
 

src/sdl/i_system.cpp

@@ -1841,18 +1841,15 @@ static void I_Fork(void)
 			I_RegisterChildSignals();
 			break;
 		default:
+#ifdef LOGMESSAGES
 			if (logstream)
 				fclose(logstream);/* the child has this */
-
+#endif
 			c = wait(&status);
-
 #ifdef LOGMESSAGES
 			/* By the way, exit closes files. */
 			logstream = fopen(logfilename, "at");
-#else
-			logstream = 0;
 #endif
-
 			if (c == -1)
 			{
 				kill(child, SIGKILL);
@@ -1896,8 +1893,8 @@ INT32 I_StartupSystem(void)
 		I_Fork();
 #endif
 #ifdef HAVE_THREADS
-	I_StartThreads();
-	I_AddExitFunc(I_StopThreads);
+	I_start_threads();
+	I_AddExitFunc(I_stop_threads);
 	I_ThreadPoolInit();
 	I_AddExitFunc(I_ThreadPoolShutdown);
 #endif

src/sdl/i_threads.c

@@ -0,0 +1,360 @@
+// SONIC ROBO BLAST 2 KART
+//-----------------------------------------------------------------------------
+// Copyright (C) 2020 by James R.
+//
+// This program is free software distributed under the
+// terms of the GNU General Public License, version 2.
+// See the 'LICENSE' file for more details.
+//-----------------------------------------------------------------------------
+/// \file  i_threads.c
+/// \brief Multithreading abstraction
+
+#ifdef HAVE_THREADS
+
+#include "../doomdef.h"
+#include "../i_threads.h"
+
+#include <SDL.h>
+
+typedef void * (*Create_fn)(void);
+
+struct Link;
+struct Thread;
+
+typedef struct Link   * Link;
+typedef struct Thread * Thread;
+
+struct Link
+{
+	void * data;
+	Link   next;
+	Link   prev;
+};
+
+struct Thread
+{
+	I_thread_fn   entry;
+	void        * userdata;
+
+	SDL_Thread  * thread;
+};
+
+static Link    i_thread_pool;
+static Link    i_mutex_pool;
+static Link    i_cond_pool;
+
+static I_mutex        i_thread_pool_mutex;
+static I_mutex        i_mutex_pool_mutex;
+static I_mutex        i_cond_pool_mutex;
+
+static SDL_atomic_t   i_threads_running = {1};
+
+static Link
+Insert_link (
+		Link * head,
+		Link   link
+){
+	link->prev = NULL;
+	link->next = (*head);
+	if ((*head))
+		(*head)->prev = link;
+	(*head)    = link;
+	return link;
+}
+
+static void
+Free_link (
+		Link * head,
+		Link   link
+){
+	if (link->prev)
+		link->prev->next = link->next;
+	else
+		(*head) = link->next;
+
+	if (link->next)
+		link->next->prev = link->prev;
+
+	free(link->data);
+	free(link);
+}
+
+static Link
+New_link (void *data)
+{
+	Link link;
+
+	link = malloc(sizeof *link);
+
+	if (! link)
+		abort();
+
+	link->data = data;
+
+	return link;
+}
+
+static void *
+Identity (
+		Link      *  pool_anchor,
+		I_mutex      pool_mutex,
+
+		void      ** anchor,
+
+		Create_fn    create_fn
+){
+	void * id;
+
+	id = SDL_AtomicGetPtr(anchor);
+
+	if (! id)
+	{
+		I_lock_mutex(&pool_mutex);
+		{
+			id = SDL_AtomicGetPtr(anchor);
+
+			if (! id)
+			{
+				id = (*create_fn)();
+
+				if (! id)
+					abort();
+
+				Insert_link(pool_anchor, New_link(id));
+
+				SDL_AtomicSetPtr(anchor, id);
+			}
+		}
+		I_unlock_mutex(pool_mutex);
+	}
+
+	return id;
+}
+
+static int
+Worker (
+		Link link
+){
+	Thread th;
+
+	th = link->data;
+
+	(*th->entry)(th->userdata);
+
+	if (SDL_AtomicGet(&i_threads_running))
+	{
+		I_lock_mutex(&i_thread_pool_mutex);
+		{
+			if (SDL_AtomicGet(&i_threads_running))
+			{
+				SDL_DetachThread(th->thread);
+				Free_link(&i_thread_pool, link);
+			}
+		}
+		I_unlock_mutex(i_thread_pool_mutex);
+	}
+
+	return 0;
+}
+
+void
+I_spawn_thread (
+		const char  * name,
+		I_thread_fn   entry,
+		void        * userdata
+){
+	Link   link;
+	Thread th;
+
+	th = malloc(sizeof *th);
+
+	if (! th)
+		abort();/* this is pretty GNU of me */
+
+	th->entry    = entry;
+	th->userdata = userdata;
+
+	I_lock_mutex(&i_thread_pool_mutex);
+	{
+		link = Insert_link(&i_thread_pool, New_link(th));
+
+		if (SDL_AtomicGet(&i_threads_running))
+		{
+			th->thread = SDL_CreateThread(
+					(SDL_ThreadFunction)Worker,
+					name,
+					link
+			);
+
+			if (! th->thread)
+				abort();
+		}
+	}
+	I_unlock_mutex(i_thread_pool_mutex);
+}
+
+int
+I_thread_is_stopped (void)
+{
+	return ( ! SDL_AtomicGet(&i_threads_running) );
+}
+
+void
+I_start_threads (void)
+{
+	i_thread_pool_mutex = SDL_CreateMutex();
+	i_mutex_pool_mutex  = SDL_CreateMutex();
+	i_cond_pool_mutex   = SDL_CreateMutex();
+
+	if (!(
+				i_thread_pool_mutex &&
+				i_mutex_pool_mutex  &&
+				i_cond_pool_mutex
+	)){
+		abort();
+	}
+}
+
+void
+I_stop_threads (void)
+{
+	Link        link;
+	Link        next;
+
+	Thread      th;
+	SDL_mutex * mutex;
+	SDL_cond  * cond;
+
+	if (i_threads_running.value)
+	{
+		/* rely on the good will of thread-san */
+		SDL_AtomicSet(&i_threads_running, 0);
+
+		I_lock_mutex(&i_thread_pool_mutex);
+		{
+			for (
+					link = i_thread_pool;
+					link;
+					link = next
+			){
+				next = link->next;
+				th   = link->data;
+
+				SDL_WaitThread(th->thread, NULL);
+
+				free(th);
+				free(link);
+			}
+		}
+		I_unlock_mutex(i_thread_pool_mutex);
+
+		for (
+				link = i_mutex_pool;
+				link;
+				link = next
+		){
+			next  = link->next;
+			mutex = link->data;
+
+			SDL_DestroyMutex(mutex);
+
+			free(link);
+		}
+
+		for (
+				link = i_cond_pool;
+				link;
+				link = next
+		){
+			next = link->next;
+			cond = link->data;
+
+			SDL_DestroyCond(cond);
+
+			free(link);
+		}
+
+		SDL_DestroyMutex(i_thread_pool_mutex);
+		SDL_DestroyMutex(i_mutex_pool_mutex);
+		SDL_DestroyMutex(i_cond_pool_mutex);
+	}
+}
+
+void
+I_lock_mutex (
+		I_mutex * anchor
+){
+	SDL_mutex * mutex;
+
+	mutex = Identity(
+			&i_mutex_pool,
+			i_mutex_pool_mutex,
+			anchor,
+			(Create_fn)SDL_CreateMutex
+	);
+
+	if (SDL_LockMutex(mutex) == -1)
+		abort();
+}
+
+void
+I_unlock_mutex (
+		I_mutex id
+){
+	if (SDL_UnlockMutex(id) == -1)
+		abort();
+}
+
+void
+I_hold_cond (
+		I_cond  * cond_anchor,
+		I_mutex   mutex_id
+){
+	SDL_cond * cond;
+
+	cond = Identity(
+			&i_cond_pool,
+			i_cond_pool_mutex,
+			cond_anchor,
+			(Create_fn)SDL_CreateCond
+	);
+
+	if (SDL_CondWait(cond, mutex_id) == -1)
+		abort();
+}
+
+void
+I_wake_one_cond (
+		I_cond * anchor
+){
+	SDL_cond * cond;
+
+	cond = Identity(
+			&i_cond_pool,
+			i_cond_pool_mutex,
+			anchor,
+			(Create_fn)SDL_CreateCond
+	);
+
+	if (SDL_CondSignal(cond) == -1)
+		abort();
+}
+
+void
+I_wake_all_cond (
+		I_cond * anchor
+){
+	SDL_cond * cond;
+
+	cond = Identity(
+			&i_cond_pool,
+			i_cond_pool_mutex,
+			anchor,
+			(Create_fn)SDL_CreateCond
+	);
+
+	if (SDL_CondBroadcast(cond) == -1)
+		abort();
+}
+
+#endif // HAVE_THREADS

src/z_zone.cpp

@@ -75,8 +75,6 @@ typedef struct memblock_s
 #define MEMORY(x) (void *)((uintptr_t)(x) + sizeof(memblock_t) + ALIGNPAD)
 #define MEMBLOCK(x) (memblock_t *)((uintptr_t)(x) - ALIGNPAD - sizeof(memblock_t))
 
-static thread_handle_t main_thread;
-
 // both the head and tail of the zone memory block list
 static memblock_t head;
 
@@ -110,7 +108,6 @@ static void Command_Memdump_f(void);
 void Z_Init(void)
 {
 	size_t total, memfree;
-	main_thread = I_GetCurrentThread();
 
 	memset(&head, 0x00, sizeof(head));
 
@@ -146,8 +143,6 @@ void Z_Free(void *ptr)
 {
 	memblock_t *block;
 
-	I_Assert(I_GetCurrentThread() == main_thread);
-
 	if (ptr == NULL)
 		return;
 
@@ -242,8 +237,6 @@ void *Z_Malloc(size_t size, INT32 tag, void *user)
 	memblock_t *block;
 	void *ptr;
 
-	I_Assert(I_GetCurrentThread() == main_thread);
-
 #ifdef ZDEBUG2
 	CONS_Debug(DBG_MEMORY, "Z_Malloc %s:%d\n", file, line);
 #endif
@@ -307,8 +300,6 @@ void *Z_Calloc2(size_t size, INT32 tag, void *user, const char *file, INT32 line
 void *Z_Calloc(size_t size, INT32 tag, void *user)
 #endif
 {
-	I_Assert(I_GetCurrentThread() == main_thread);
-
 #ifdef VALGRIND_MEMPOOL_ALLOC
 	Z_calloc = true;
 #endif
@@ -344,8 +335,6 @@ void *Z_Realloc(void *ptr, size_t size, INT32 tag, void *user)
 	memblock_t *block;
 	size_t copysize;
 
-	I_Assert(I_GetCurrentThread() == main_thread);
-
 #ifdef ZDEBUG2
 	CONS_Debug(DBG_MEMORY, "Z_Realloc %s:%d\n", file, line);
 #endif
@@ -425,8 +414,6 @@ void Z_FreeTags(INT32 lowtag, INT32 hightag)
 {
 	memblock_t *block, *next;
 
-	I_Assert(I_GetCurrentThread() == main_thread);
-
 #ifdef ZDEBUG
 	Z_CheckHeap2(file, line);
 #else
@@ -460,8 +447,6 @@ void Z_IterateTags(INT32 lowtag, INT32 hightag, boolean (*iterfunc)(void *))
 {
 	memblock_t *block, *next;
 
-	I_Assert(I_GetCurrentThread() == main_thread);
-
 	if (!iterfunc)
 		I_Error("Z_IterateTags: no iterator function was given");