add thread functionality, powered by pthreads

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@928 a1c6a512-1295-4272-9138-f99709370657

uisimulator/x11/Makefile

@@ -48,7 +48,7 @@ LDFLAGS = -lX11 -lm -lXt -lXmu -lnsl
 
 INCLUDES = -I. -I$(DRIVERS) -I$(COMMON) -I$(FIRMWAREDIR) -I$(APPDIR) -I$(RECDIR)
 
-LIBS = 
+LIBS = -lpthread
 
 UNAME := $(shell uname)
 ifeq ($(UNAME),Linux)
@@ -77,7 +77,7 @@ ifeq ($(DISPLAY),-DHAVE_LCD_BITMAP)
 endif
 
 SRCS = screenhack.c uibasic.c resources.c visual.c lcd-x11.c mpeg.c \
-        button-x11.c io.c sleep.c $(APPS) $(FIRMSRCS)
+        button-x11.c io.c sleep.c thread.c $(APPS) $(FIRMSRCS)
 
 ifdef MPEG_PLAY
   SRCS += mpegplay.c oss_sound.c bit.c decoder.c fixed.c frame.c huffman.c layer12.c layer3.c stream.c synth.c timer.c version.c

uisimulator/x11/thread.c

@@ -0,0 +1,69 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Copyright (C) 2002 Daniel Stenberg
+ *
+ * All files in this archive are subject to the GNU General Public License.
+ * See the file COPYING in the source tree root for full license agreement.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ****************************************************************************/
+
+#include <stdio.h>
+#include <pthread.h>
+
+/*
+ * We emulate the target threads by using pthreads. We have a mutex that only
+ * allows one thread at a time to execute. It forces each thread to yield()
+ * for the other(s) to run.
+ */
+
+pthread_mutex_t mp;
+
+void init_threads(void)
+{  
+  pthread_mutex_init(&mp, NULL);
+}
+/* 
+   int pthread_create(pthread_t *new_thread_ID,
+   const pthread_attr_t *attr,
+   void * (*start_func)(void *), void *arg);
+*/
+
+void yield(void)
+{
+  pthread_mutex_unlock(&mp); /* return */
+  pthread_mutex_lock(&mp); /* get it again */
+}
+
+int create_thread(void* fp, void* sp, int stk_size)
+{
+  pthread_t tid;
+  int i;
+  int error;
+
+  /* we really don't care about these arguments */
+  (void)sp;
+  (void)stk_size;
+  error = pthread_create(&tid,
+                         NULL, /* default attributes please */
+                         fp,   /* function to start */
+                         NULL  /* start argument */);
+  if(0 != error)
+    fprintf(stderr, "Couldn't run thread number %d, errno %d\n", i, error);
+  else 
+    fprintf(stderr, "Thread %d is running\n", tid);
+
+  /* get mutex to only allow one thread running at a time */
+  pthread_mutex_lock(&mp);
+
+  return error;
+}