Add support for C++ std::thread and derivatives

Implements dkp's gthread interface using LWP functions.
With this, std::{thread,mutex,recursive_mutex,condition_variable} are
now supported.

Author: Mefiresu

Makefile

@@ -100,6 +100,7 @@ INCLUDES	+=	-I$(BASEDIR)/cube
 endif
 
 CFLAGS		:= $(FALSE_POSITIVES) -g -O2 -fno-strict-aliasing -Wall $(MACHDEP) $(INCLUDES)
+CXXFLAGS	:= $(CFLAGS) -std=gnu++17 -fno-exceptions -fno-rtti
 ASFLAGS		:= $(MACHDEP) -mregnames -D_LANGUAGE_ASSEMBLY $(INCLUDES)
 
 #---------------------------------------------------------------------------------
@@ -149,7 +150,7 @@ OGCOBJ		:=	\
 			console_font_8x16.o timesupp.o lock_supp.o usbgecko.o usbmouse.o \
 			sbrk.o malloc_lock.o kprintf.o stm.o aes.o sha.o ios.o es.o isfs.o usb.o network_common.o \
 			sdgecko_io.o sdgecko_buf.o gcsd.o argv.o network_wii.o wiisd.o conf.o usbstorage.o \
-			texconv.o wiilaunch.o sys_report.o
+			texconv.o wiilaunch.o sys_report.o ogc_gthread.o
 
 #---------------------------------------------------------------------------------
 MODOBJ		:=	freqtab.o mixer.o modplay.o semitonetab.o gcmodplay.o

libogc/ogc_gthread.cpp

@@ -0,0 +1,176 @@
+#include <bits/gthr-default.h>
+#include <errno.h>
+#include <stdlib.h>
+#include <malloc.h>
+
+#include "lwp.h"
+#include "mutex.h"
+#include "cond.h"
+
+#define __OGC_GTHR_BASE_PRIO (64)
+
+extern "C" {
+
+typedef struct {
+	lwpq_t queue;
+	lwp_t thread;
+} gthr_thread_t;
+
+int __gthr_impl_active(void)
+{
+	return 1;
+}
+
+int __gthr_impl_create(__gthread_t *__threadid, void *(*__func) (void*), void *__args)
+{
+	gthr_thread_t *th = (gthr_thread_t*)malloc(sizeof(gthr_thread_t));
+
+	if (!th) {
+		return ENOMEM;
+	}
+
+	if (LWP_InitQueue(&th->queue) != LWP_SUCCESSFUL) {
+		free(th);
+		return EINVAL;
+	}
+
+	if (LWP_CreateThread(&th->thread, __func, __args, NULL, 0, __OGC_GTHR_BASE_PRIO) != LWP_SUCCESSFUL) {
+		LWP_CloseQueue(th->queue);
+		free(th);
+		return EINVAL;
+	}
+
+	*__threadid = (__gthread_t)th;
+	return 0;
+}
+
+int __gthr_impl_join(__gthread_t __threadid, void **__value_ptr)
+{
+	gthr_thread_t *th = (gthr_thread_t*)__threadid;
+
+	int res = LWP_JoinThread(th->thread, __value_ptr);
+	if (res != LWP_SUCCESSFUL) {
+		return -1;
+	}
+
+	/* Clean up thread data */
+	LWP_CloseQueue(th->queue);
+	free(th);
+
+	return 0;
+}
+
+int __gthr_impl_detach(__gthread_t __threadid)
+{
+	/* Not supported */
+	return -1;
+}
+
+int __gthr_impl_equal(__gthread_t __t1, __gthread_t __t2)
+{
+	return (gthr_thread_t*)__t1 == (gthr_thread_t*)__t2;
+}
+
+__gthread_t __gthr_impl_self(void)
+{
+	/*
+	HACK: __gthread_self() is only used for std::thread::get_id(), so returning
+	LWP_GetSelf() works as a unique id even though it's technically not a thread
+	 */
+	return (__gthread_t)LWP_GetSelf();
+}
+
+int __gthr_impl_yield(void)
+{
+	LWP_YieldThread();
+	return 0;
+}
+
+void __gthr_impl_mutex_init_function(__gthread_mutex_t *mutex)
+{
+	LWP_MutexInit(((mutex_t*)mutex), false);
+}
+
+int __gthr_impl_mutex_lock(__gthread_mutex_t *mutex)
+{
+	return LWP_MutexLock(*((mutex_t*)mutex));
+}
+
+int __gthr_impl_mutex_trylock(__gthread_mutex_t *mutex)
+{
+	return LWP_MutexTryLock(*((mutex_t*)mutex));
+}
+
+int __gthr_impl_mutex_unlock(__gthread_mutex_t *mutex)
+{
+	return LWP_MutexUnlock(*((mutex_t*)mutex));
+}
+
+int __gthr_impl_mutex_destroy(__gthread_mutex_t *mutex)
+{
+	return LWP_MutexDestroy(*((mutex_t*)mutex));
+}
+
+int __gthr_impl_recursive_mutex_init_function(__gthread_recursive_mutex_t *mutex)
+{
+	return LWP_MutexInit(((mutex_t *)mutex), true);
+}
+
+int __gthr_impl_recursive_mutex_lock(__gthread_recursive_mutex_t *mutex)
+{
+	return LWP_MutexLock(*((mutex_t*)mutex));
+}
+
+int __gthr_impl_recursive_mutex_trylock(__gthread_recursive_mutex_t *mutex)
+{
+	return LWP_MutexTryLock(*((mutex_t*)mutex));
+}
+
+int __gthr_impl_recursive_mutex_unlock(__gthread_recursive_mutex_t *mutex)
+{
+	return LWP_MutexUnlock(*((mutex_t*)mutex));
+}
+
+int __gthr_impl_recursive_mutex_destroy(__gthread_recursive_mutex_t *mutex)
+{
+	return LWP_MutexDestroy(*((mutex_t*)mutex));
+}
+
+void __gthr_impl_cond_init_function(__gthread_cond_t *__cond)
+{
+	LWP_CondInit((cond_t*)__cond);
+}
+
+int __gthr_impl_cond_broadcast(__gthread_cond_t *__cond)
+{
+	return LWP_CondBroadcast(*(cond_t*)__cond);
+}
+
+int __gthr_impl_cond_signal(__gthread_cond_t *__cond)
+{
+	return LWP_CondSignal(*(cond_t*)__cond);
+}
+
+int __gthr_impl_cond_wait(__gthread_cond_t *__cond, __gthread_mutex_t *__mutex)
+{
+	return LWP_CondWait(*(cond_t*)__cond, *(mutex_t*)__mutex);
+}
+
+int __gthr_impl_cond_timedwait(__gthread_cond_t *__cond, __gthread_mutex_t *__mutex, const __gthread_time_t *__abs_timeout)
+{
+	return LWP_CondTimedWait(*(cond_t*)__cond, *(mutex_t*)__mutex, __abs_timeout);
+}
+
+int __gthr_impl_cond_wait_recursive(__gthread_cond_t *__cond, __gthread_recursive_mutex_t *__mutex)
+{
+	return LWP_CondWait(*(cond_t*)__cond, *(mutex_t*)__mutex);
+}
+
+int __gthr_impl_cond_destroy(__gthread_cond_t* __cond)
+{
+	return LWP_CondDestroy(*(cond_t*)__cond);
+}
+
+/* Dummy function required so that the linker doesn't strip this module */
+void __ogc_gthread_init() {}
+}

libogc/system.c

@@ -215,6 +215,8 @@ extern int __libogc_nanosleep(const struct timespec *tb, struct timespec *rem);
 extern u64 gettime(void);
 extern void settime(u64);
 
+extern void __ogc_gthread_init();
+
 extern u8 __gxregs[];
 extern u8 __text_start[];
 extern u8 __isIPL[];
@@ -1097,6 +1099,7 @@ void SYS_Init(void)
 	IRQ_Request(IRQ_PI_RSW,__RSWHandler,NULL);
 	__MaskIrq(IRQMASK(IRQ_PI_RSW));
 #endif
+	__ogc_gthread_init();
 	__lwp_thread_startmultitasking();
 	_CPU_ISR_Restore(level);
 }