Port of Duke Nukem 3D

This ports Fabien Sanglard's Chocolate Duke to run on a version of SDL
for Rockbox.

Change-Id: I8f2c4c78af19de10c1633ed7bb7a997b43256dd9

apps/plugins/sdl/src/thread/pthread/SDL_syssem.c

@@ -0,0 +1,190 @@
+/*
+    SDL - Simple DirectMedia Layer
+    Copyright (C) 1997-2012 Sam Lantinga
+
+    This library is free software; you can redistribute it and/or
+    modify it under the terms of the GNU Lesser General Public
+    License as published by the Free Software Foundation; either
+    version 2.1 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
+    Lesser General Public License for more details.
+
+    You should have received a copy of the GNU Lesser General Public
+    License along with this library; if not, write to the Free Software
+    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+
+    Sam Lantinga
+    slouken@libsdl.org
+*/
+#include "SDL_config.h"
+
+#include <pthread.h>
+#include <semaphore.h>
+#include <errno.h>
+#include <sys/time.h>
+
+#include "SDL_thread.h"
+#include "SDL_timer.h"
+
+/* Wrapper around POSIX 1003.1b semaphores */
+
+#ifdef __MACOSX__
+/* Mac OS X doesn't support sem_getvalue() as of version 10.4 */
+#include "../generic/SDL_syssem.c"
+#else
+
+struct SDL_semaphore {
+	sem_t sem;
+};
+
+/* Create a semaphore, initialized with value */
+SDL_sem *SDL_CreateSemaphore(Uint32 initial_value)
+{
+	SDL_sem *sem = (SDL_sem *) SDL_malloc(sizeof(SDL_sem));
+	if ( sem ) {
+		if ( sem_init(&sem->sem, 0, initial_value) < 0 ) {
+			SDL_SetError("sem_init() failed");
+			SDL_free(sem);
+			sem = NULL;
+		}
+	} else {
+		SDL_OutOfMemory();
+	}
+	return sem;
+}
+
+void SDL_DestroySemaphore(SDL_sem *sem)
+{
+	if ( sem ) {
+		sem_destroy(&sem->sem);
+		SDL_free(sem);
+	}
+}
+
+int SDL_SemTryWait(SDL_sem *sem)
+{
+	int retval;
+
+	if ( ! sem ) {
+		SDL_SetError("Passed a NULL semaphore");
+		return -1;
+	}
+	retval = SDL_MUTEX_TIMEDOUT;
+	if ( sem_trywait(&sem->sem) == 0 ) {
+		retval = 0;
+	}
+	return retval;
+}
+
+int SDL_SemWait(SDL_sem *sem)
+{
+	int retval;
+
+	if ( ! sem ) {
+		SDL_SetError("Passed a NULL semaphore");
+		return -1;
+	}
+
+	while ( ((retval = sem_wait(&sem->sem)) == -1) && (errno == EINTR) ) {}
+	if ( retval < 0 ) {
+		SDL_SetError("sem_wait() failed");
+	}
+	return retval;
+}
+
+int SDL_SemWaitTimeout(SDL_sem *sem, Uint32 timeout)
+{
+	int retval;
+#ifdef HAVE_SEM_TIMEDWAIT
+	struct timeval now;
+	struct timespec ts_timeout;
+#else
+	Uint32 end;
+#endif
+
+	if ( ! sem ) {
+		SDL_SetError("Passed a NULL semaphore");
+		return -1;
+	}
+
+	/* Try the easy cases first */
+	if ( timeout == 0 ) {
+		return SDL_SemTryWait(sem);
+	}
+	if ( timeout == SDL_MUTEX_MAXWAIT ) {
+		return SDL_SemWait(sem);
+	}
+
+#ifdef HAVE_SEM_TIMEDWAIT
+	/* Setup the timeout. sem_timedwait doesn't wait for
+	 * a lapse of time, but until we reach a certain time.
+	 * This time is now plus the timeout.
+	 */
+	gettimeofday(&now, NULL);
+
+	/* Add our timeout to current time */
+	now.tv_usec += (timeout % 1000) * 1000;
+	now.tv_sec += timeout / 1000;
+
+	/* Wrap the second if needed */
+	if ( now.tv_usec >= 1000000 ) {
+		now.tv_usec -= 1000000;
+		now.tv_sec ++;
+	}
+
+	/* Convert to timespec */
+	ts_timeout.tv_sec = now.tv_sec;
+	ts_timeout.tv_nsec = now.tv_usec * 1000;
+
+	/* Wait. */
+	do
+		retval = sem_timedwait(&sem->sem, &ts_timeout);
+	while (retval == -1 && errno == EINTR);
+
+	if (retval == -1)
+		SDL_SetError(strerror(errno));
+#else
+	end = SDL_GetTicks() + timeout;
+	while ((retval = SDL_SemTryWait(sem)) == SDL_MUTEX_TIMEDOUT) {
+		if ((SDL_GetTicks() - end) >= 0) {
+			break;
+		}
+		SDL_Delay(0);
+	}
+#endif /* HAVE_SEM_TIMEDWAIT */
+
+	return retval;
+}
+
+Uint32 SDL_SemValue(SDL_sem *sem)
+{
+	int ret = 0;
+	if ( sem ) {
+		sem_getvalue(&sem->sem, &ret);
+		if ( ret < 0 ) {
+			ret = 0;
+		}
+	}
+	return (Uint32)ret;
+}
+
+int SDL_SemPost(SDL_sem *sem)
+{
+	int retval;
+
+	if ( ! sem ) {
+		SDL_SetError("Passed a NULL semaphore");
+		return -1;
+	}
+
+	retval = sem_post(&sem->sem);
+	if ( retval < 0 ) {
+		SDL_SetError("sem_post() failed");
+	}
+	return retval;
+}
+
+#endif /* __MACOSX__ */