--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/thread/amigaos/SDL_syssem.c	Thu Apr 26 16:45:43 2001 +0000
@@ -0,0 +1,166 @@
+/*
+    SDL - Simple DirectMedia Layer
+    Copyright (C) 1997, 1998, 1999, 2000, 2001  Sam Lantinga
+
+    This library is free software; you can redistribute it and/or
+    modify it under the terms of the GNU Library General Public
+    License as published by the Free Software Foundation; either
+    version 2 of the License, or (at your option) any later version.
+
+    This library 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
+    Library General Public License for more details.
+
+    You should have received a copy of the GNU Library General Public
+    License along with this library; if not, write to the Free
+    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+    Sam Lantinga
+    slouken@devolution.com
+*/
+
+#ifdef SAVE_RCSID
+static char rcsid =
+ "@(#) $Id$";
+#endif
+
+/* An native implementation of semaphores on AmigaOS */
+
+#include "SDL_error.h"
+#include "SDL_thread.h"
+#include "SDL_systhread_c.h"
+
+
+struct SDL_semaphore
+{
+	struct SignalSemaphore Sem;
+};
+
+#undef D(x)
+
+#define D(x)
+
+SDL_sem *SDL_CreateSemaphore(Uint32 initial_value)
+{
+	SDL_sem *sem;
+
+	sem = (SDL_sem *)malloc(sizeof(*sem));
+	if ( ! sem ) {
+		SDL_OutOfMemory();
+		return(0);
+	}
+	memset(sem, 0, sizeof(*sem));
+
+	D(bug("Creating semaphore %lx...\n",sem));
+
+	InitSemaphore(&sem->Sem);
+#if 1 // Allow multiple obtainings of the semaphore
+        while ( initial_value-- ) {
+		ReleaseSemaphore(&sem->Sem);
+	}
+#endif
+	return(sem);
+}
+
+void SDL_DestroySemaphore(SDL_sem *sem)
+{
+	D(bug("Destroying semaphore %lx...\n",sem));
+
+	if ( sem ) {
+// Condizioni per liberare i task in attesa?
+		free(sem);
+	}
+}
+
+int SDL_SemTryWait(SDL_sem *sem)
+{
+	int retval;
+
+	if ( ! sem ) {
+		SDL_SetError("Passed a NULL semaphore");
+		return -1;
+	}
+
+	D(bug("TryWait semaphore...%lx\n",sem));
+
+	retval = SDL_MUTEX_TIMEDOUT;
+	if ( AttemptSemaphore(&sem->Sem) ) {
+		retval = 0;
+	}
+	return retval;
+}
+
+int SDL_SemWaitTimeout(SDL_sem *sem, Uint32 timeout)
+{
+	int retval;
+
+	if ( ! sem ) {
+		SDL_SetError("Passed a NULL semaphore");
+		return -1;
+	}
+
+	D(bug("WaitTimeout (%ld) semaphore...%lx\n",timeout,sem));
+
+#if 1 // We need to keep trying the semaphore until the timeout expires
+	retval = SDL_MUTEX_TIMEDOUT;
+	then = SDL_GetTicks();
+	do {
+		if ( AttemptSemaphore(&sem->Sem) ) {
+			retval = 0;
+		}
+		now = SDL_GetTicks();
+	} while ( (retval == SDL_MUTEX_TIMEDOUT) && ((now-then) < timeout) );
+#else
+	if(!(retval=AttemptSemaphore(&sem->Sem)))
+	{
+		SDL_Delay(timeout);
+		retval=AttemptSemaphore(&sem->Sem);
+	}
+
+	if(retval==TRUE)
+	{
+//		ReleaseSemaphore(&sem->Sem);
+		retval=1;
+	}
+#endif
+	return retval;
+}
+
+int SDL_SemWait(SDL_sem *sem)
+{
+	if ( ! sem ) {
+		SDL_SetError("Passed a NULL semaphore");
+		return -1;
+	}
+#if 1 // This should be an infinite wait - FIXME, what is the return value?
+	ObtainSemaphore(&sem->Sem);
+        return 0;
+#else
+	return SDL_SemWaitTimeout(sem, SDL_MUTEX_MAXWAIT);
+#endif
+}
+
+Uint32 SDL_SemValue(SDL_sem *sem)
+{
+	Uint32 value;
+	
+	value = 0;
+	if ( sem ) {
+		value = sem->Sem.ss_NestCount;
+	}
+	return value;
+}
+
+int SDL_SemPost(SDL_sem *sem)
+{
+	if ( ! sem ) {
+		SDL_SetError("Passed a NULL semaphore");
+		return -1;
+	}
+	D(bug("SemPost semaphore...%lx\n",sem));
+
+	ReleaseSemaphore(&sem->Sem);
+	return 0;
+}
+